Showing posts with label Nuclear. Show all posts
Showing posts with label Nuclear. Show all posts

Wednesday, May 23, 2012

WHO Report On Radiation Exposure From Fukushima Reactor Accident

 

 

# 6341

 

 

Today, a little more than a year after Japan’s catastrophic earthquake and tsunami, the World Health Organization has released a 120 page preliminary assessment of radiation exposure from the crippled nuclear plants in Fukushima Japan.

 

Preliminary Dose Estimation from the nuclear accident after the 2011 Great East Japan Earthquake and Tsunami

 Authors:
WHO

Publication details

Number of pages: 120
Publication date: 2012
Languages: English
ISBN: 9789241593662

Downloads
Overview

The earthquake and tsunami in Japan on 11 March 2011 led to releases of radioactive material into the environment from the Fukushima Daiichi nuclear site. This report describes a preliminary estimate of radiation doses to the public resulting from this accident. These doses are assessed for different age groups in locations around the world, using assumptions described in the report.

 

The dose assessment forms one part of the overall health risk assessment being carried out by WHO of the global impact of the accident at the Fukushima Daiichi nuclear power plant. The health risk assessment is the subject of a separate WHO report which will be published in Summer 2012.

Related links

 

 

From the FAQ page, we get the bottom line, and for just about everyone living outside of Fukushima and neighboring prefectures, the news is very reassuring.

 

Q5. What does the report conclude?

It can be concluded that the estimated effective doses outside Japan from the Fukushima Daiichi NPP accident are below (and often far below) dose levels regarded as being very small by the international radiological protection community. Low effective doses are also estimated in much of Japan.

 

In the Fukushima prefecture and in neighbouring prefectures the effective doses are estimated to be below 10 mSv, which can be considered within the order of magnitude of the natural radiation background, except in two locations. In these two locations in the most affected part of Fukushima prefecture, the effective doses were estimated to be within a dose band of 10–50 mSv. Please see table 3 for more data on effective doses, and table 8 for comparative effective dose levels in different contexts.

 

This report focuses on effective dose as an appropriate measure given that it takes into account both internal and external exposures. In addition, the report includes information about thyroid doses because of this organ’s capacity for iodine concentration.

 

It is important to note that effective doses and thyroid doses are two different quantities that cannot be compared. Thyroid doses are organ-specific equivalent doses. See table 4 for data on specific exposure to thyroid doses.

 

 

As far as the short and long term health-risk due to exposure to radioactivity, a report is expected from the WHO later this summer.

Thursday, March 29, 2012

Fukushima Nuke Plant Remains In `Precarious State’

 

 image

Photo credit IAEA

# 6251

 

Unless we are directly affected by them, once a disaster moves off the front pages, we tend move on as the never ending parade of newer, more immediate concerns emerge.

 

A year ago, the world watched in horror as Japan reeled from a monstrous earthquake/tsunami followed by a major nuclear accident.

 

Over time, as the recovery efforts proceeded and the nuke plants were finally deemed `stable’, the triple disaster of Fukushima has faded for most of us.

 

But as we learn from a report in the New York Times today, the reactor at Fukushima may be in worse shape than previously admitted, and its current stability is precarious at best.

 

Japan Admits Nuclear Plant Still Poses Dangers

By HIROKO TABUCHI 

TOKYO — The damage to the core of at least one of the meltdown-stricken reactors at Fukushima could be far worse than previously thought, raising fresh concerns over the plant’s stability and gravely complicating the post-disaster cleanup, a recent internal investigation has shown.

(Continue . . .)

 

 

Follow the link to read the entire article to learn about the specifics, including much lower water levels over the fuel rods than previously reported, and much higher levels of radiation inside the containment buildings.

 

But the `money quote’ comes from Kazuhiko Kudo, a professor of nuclear engineering at Kyushu University, at the end of the article who warns:

 

“The plant is still in a precarious state.

Unfortunately, all we can do is to keep pumping water inside the reactors, and hope we don’t have another big earthquake.”


 

Cleanup of these plants may take decades, and until that can be accomplished, they remain vulnerable to additional seismic shocks.

Friday, March 02, 2012

Bulletin Of The Atomic Scientists: Fukushima Crisis in review

 

 

image

# 6189

 

It’s been nearly a year since the disastrous earthquake & subsequent tsunamis hit northern Japan, leaving a major nuclear accident to unfold in the debris.

 

Only recently have we begun to hear detailed reports of just how chaotic, and apparently ineffectual, the disaster response was in the opening days and weeks of that nuclear crisis.

 

Yesterday, the Bulletin of Atomic Scientists published a 14-page analysis of Japan’s initial response to this nuclear crisis, which found (among other things)  that the Japanese government, and plant owner TEPCO, were:

 

“. . .  astonishingly unprepared, at almost all levels, for the complex nuclear disaster that started with an earthquake and a tsunami.”

 

This entire analysis makes for sobering reading, and is freely available on their website.

 

 

 

Fukushima in review: A complex disaster, a disastrous response

Yoichi Funabashi Kay Kitazawa

Abstract

On March 11, 2011, an earthquake and tsunami crippled the Fukushima Daiichi Nuclear Power Station. The emerging crisis at the plant was complex, and, to make matters worse, it was exacerbated by communication gaps between the government and the nuclear industry.

 

An independent investigation panel, established by the Rebuild Japan Initiative Foundation, reviewed how the government, the Tokyo Electric Power Company (Tepco), and other relevant actors responded.

 

In this article, the panel’s program director writes about their findings and how these players were thoroughly unprepared on almost every level for the cascading nuclear disaster.

 

This lack of preparation was caused, in part, by a public myth of “absolute safety” that nuclear power proponents had nurtured over decades and was aggravated by dysfunction within and between government agencies and Tepco, particularly in regard to political leadership and crisis management.

 

The investigation also found that the tsunami that began the nuclear disaster could and should have been anticipated and that ambiguity about the roles of public and private institutions in such a crisis was a factor in the poor response at Fukushima.  

Wednesday, June 08, 2011

A Different Kind Of Nuclear Fallout

 

 

# 5613

 

image

Map credit- Wikipedia

 

The future of nuclear energy in Japan may be decided on a community-by-community basis.

 

Reuters is reporting today that Japan – which up until now has steadfastly insisted that nuclear energy would remain a major component of their electrical generating infrastructure – would consider shutting down all 54 of their nuclear power plants if local communities objected to their operation due to safety concerns.

 

Moving to fossil fuels – which must be imported – could add another 3 trillion yen ($30 billion U.S.) per year to that country’s energy costs.

 

As all Japanese nuclear plants must be shutdown at least once every 13 months for maintenance and inspection, currently only 19 of the nation’s nuclear power plants remain online, with the last of those due for its scheduled maintenance shutdown in April of 2012.

 

Although NISA has the authority to authorize the restarting of a nuclear plant, plant operators always go to local governments for their approval before bringing a nuclear reactor back online.

 

While a complete cessation of nuclear power production in Japan may sound like an unlikely outcome right now, how each community will decide on this issue is unknown.

 

The ultimate success or failure of bringing the Fukushima reactor crisis to a safe resolution will no doubt heavily influence their decisions.

 

Proving that there is more than one kind of fallout to take into account following a nuclear accident.

 

 

This from Reuters.

 

Japan may have no nuclear reactors running by next April

By Risa Maeda

TOKYO | Wed Jun 8, 2011 8:58am EDT

(Reuters) - All 54 of Japan's nuclear reactors may be shut by next April, adding more than $30 billion a year to the country's energy costs, if communities object to plant operating plans due to safety concerns, trade ministry officials said on Wednesday.

(Continue . . . )

 

 

Germany, meanwhile, announced on May 31st that they would keep 8 of their nuclear power plants closed, and the remaining 9 plants would be decommissioned no later than 2022.

Tuesday, June 07, 2011

Cutting Through The Fukushima Fog

 

 


# 5610

image

Photo credit IAEA

 

As I noted in The Fog Of Disaster Reporting, written less than 48 hours after the earthquake/tsunami combination that devastated northern Japan, my confidence level in the accuracy of many of the stories coming out of the disaster zone was pretty low.

 

So low, that in many cases I opted not to use them in this blog.

 

Since then, we’ve learned that the nuclear accident at the Fukushima Daiichi facility was much worse than first reported. 

 

Despite what we now know was a meltdown of three reactors within hours of the quake, the severity level of the incident was held at a 5 for a full month (the same as Three Mile Island), before being raised to a  Chernobyl-comparable level 7 on April 11th.

 

 

Today, the Yomiuri News Agency is reporting that two of these damaged reactors may have suffered a `Melt Through’ – an even more serious event than a meltdown –where nuclear fuel actually melted through the walls or floors of reactor vessel.

 

Melted Fuel at Fukushima May Have Leaked Through, Yomiuri Says

By Go Onomitsu - Jun 7, 2011 2:02 AM ET

 

 

NHK World News is also reporting that today (Tuesday) a government appointed expert panel met for the first time to investigate the Fukushima nuclear accident (see Govt panel on nuclear accident holds 1st meeting).

 

The panel is expected to produce an interim report by the end of the year, but according to committee's head - Professor Emeritus at the University of Tokyo, Yotaro Hatamura - will not aim to clarify who is responsible for the accident.

 

Meanwhile, just hours before the first meeting of this expert panel was held, it was revealed that the amount of radiation released from the damaged Fukushima facility during the first week of the disaster was likely more than double what had previously been estimated.

 

Japan doubles plant radiation leak estimate

(AFP) – 4 hours ago

TOKYO — Japan has more than doubled its initial estimate of radiation released from the crippled Fukushima nuclear plant in the week after the March 11 tsunami, ahead of the launch of an official probe Tuesday.

 

The nation's watchdog, the Nuclear and Industrial Safety Agency (NISA), now says it believes 770,000 terabecquerels escaped into the atmosphere in the first week -- compared to its earlier estimate of 370,000 terabecquerels.

(Continue . . . )

 

The hits, as they say, just keep on coming.

 

There are now concerns that the environmental contamination surrounding the plant may be worse than previously suspected, and that people beyond the 20 km evacuation radius may have been exposed to more radiation than previously thought.

 

These belated and incrementally worsening status reports from plant operator TEPCO and Japan’s Nuclear Safety Commission probably won’t do a lot to inspire confidence in their future pronouncements.

 

Of course, early reports from the ground during any major disaster are usually fragmentary, often misleading, and occasionally just downright wrong.

 

How much of this `bad information’ is due to attempts to `manage’ the crisis by doling out bad news a piece at a time – and how much comes from a genuine impenetrable `fog’ of disaster – is hard to know.

 

Often it is a mixture of both.

 

But as was noted last month in  Sandman & Lanard On Worst-Case Crisis Communications, it is important for officials to get out in front of any crisis.

 

Playing catch-up, or worse, appearing to intentionally withhold bad news, can make a bad situation worse.

 

Telling the truth and telling it early, are key points to effective crisis communications.

 

Simple advice, yet it is often ignored.

 

In Japan’s nuclear crisis: The need to talk more candidly about worst case scenarios Peter Sandman wrote:

 

The main communication problem results from the public’s inability to know how much of the situation is under how much control, and what might happen if things get worse. Japanese officials have not helped us to understand that.

 

Worse, they have not communicated in ways that encourage us both to trust that they are telling us everything they know and everything they’re worried about, and to trust that they know what they are doing.

 

And earlier, in Cultural differences regarding Fukushima crisis communication Peter wrote about the consensus document on crisis communications from the World Health Organization  entitled “WHO Outbreak Communication Guidelines”.

 

In an excerpt from the section on Announcing early”, it states:

 

People are more likely to overestimate the risk if information is withheld. And evidence shows that the longer officials withhold worrisome information, the more frightening the information will seem when it is revealed, especially if it is revealed by an outside source….

 

Early announcements are often based on incomplete and sometimes erroneous information. It is critical to publicly acknowledge that early information may change as further information is developed or verified.

 

 

Peter Sandman Website logo

 

For anyone even remotely involved as a spokesperson for an agency, organization, or company during a crisis, their site should be viewed as essential reading. 

 


Unfortunately, the stream of continually revised information coming out of Japan over the past three months appears more akin to the hoary old tale of the wealthy Englishman who, after traveling the world for many months, called home and spoke to his butler.

 

 

"Well James, has anything happened in my absence?"

 

"Yes, sir.  Your dog died."

 

"He died? Whatever from?  He was a young pup."

 

"Probably from eating burned horse flesh, sir."

 

"Burned horseflesh?  Where on earth did he get burned horseflesh?"

 

"From the stables, Sir. They burned to the ground two weeks ago."

 

"How did the stables catch fire?"

 

"Probably flames from the house, sir."

 

"The house burned down too!  How did that happen?

 

"We suspect the drapes caught fire from the candles, sir."

 

"Candles!  We have electricity. Why on earth were you using candles?"

 

"They were around your mother's coffin in the parlor, sir."

 

"Mum is dead!  My God James, what happened!"

 

"Well Sir, we suspect it was from the shock of your wife running off with the gardener . . ."

 

You get the idea.

 

While the exchange above may make for good comedy, any semblance of it in the real world makes for lousy crisis communications.

Wednesday, June 01, 2011

IAEA Preliminary Assessment Of The Fukushima Disaster

 

 

 

# 5589

 

Last week IAEA nuclear experts from 12 countries (Argentina, China, France, Hungary, India, Indonesia, Russia, South Korea, Spain, Turkey, United Kingdom and the United States) arrived in Fukushima, Japan to conduct interviews with local officials and to visit nuclear facilities, including the earthquake and tsunami damaged Fukushima Daiichi power plant.

 

They have produced a brief (3-page) preliminary assessment of the safety issues related to the Fukushima nuclear crisis. A full report will be delivered to the Ministerial Conference on Nuclear Safety at IAEA headquarters in Vienna in about 3 weeks.

 

image

 

 

They describe the level of cooperation, and access, their expert mission received as being `excellent’, and the response of the workers at the stricken plant as `exemplary’ and `brave’

 

They also reassure that: To date no health effects have been reported in any person as a result of radiation exposure from the nuclear accident.

 

From today’s  UPDATE: IAEA Fact-Finding Team Completes Visit to Japan (1 June 2011) on the IAEA website, we get an overview of the expert mission, and a synopsis of their findings:

 

 

The expert team made several preliminary findings and lessons learned, including:

  • Japan's response to the nuclear accident has been exemplary, particularly illustrated by the dedicated, determined and expert staff working under exceptional circumstances;
  • Japan's long-term response, including the evacuation of the area around stricken reactors, has been impressive and well organized. A suitable and timely follow-up programme on public and worker exposures and health monitoring would be beneficial;
  • The tsunami hazard for several sites was underestimated. Nuclear plant designers and operators should appropriately evaluate and protect against the risks of all natural hazards, and should periodically update those assessments and assessment methodologies;
  • Nuclear regulatory systems should address extreme events adequately, including their periodic review, and should ensure that regulatory independence and clarity of roles are preserved; and
  • The Japanese accident demonstrates the value of hardened on-site Emergency Response Centres with adequate provisions for handling all necessary emergency roles, including communications.

 

While cloaked in the polite language of diplomacy, the bottom line is that what disaster planners and nuclear regulatory agencies assumed to be a `worst-case scenario’, and planned for  – a 5.7 meter tsunami – turned out to completely inadequate on March 11, 2011 when a series of 14+ meter tsunamis slammed into the Fukushima nuclear power facility.

 

It has recently emerged that this wildly optimistic worst-case disaster scenario’ came from a 1-page, decade-old memo generated by Fukushima plant operators, and that it provided little in the way of scientific data to back up their assessment (see AP article AP Exclusive: Fukushima tsunami plan a single page).

 

 

Those expecting any sort of critical exposé here will find this report lacking. Given Japan’s level of social, political, and economic uncertainty in the wake of this three-pronged disaster, the IAEA is obviously (and understandably) treading carefully here.

 

Prime Minister Naoto Kan faces a no-confidence vote this week, the Japanese economy is reeling, public confidence in TEPCO and the Japanese government’s disaster response is waning, and the Japanese people are enduring a collective tragedy almost beyond comprehension.

 

So diplomatically, this report avoids assigning blame or directing criticism, so as not to aggravate what is obviously a precarious situation.

 

A full post-mortem analysis of what happened - and what continues to transpire as crews attempt to contain this nuclear crisis - will no doubt have to wait until the emergency has passed.

 

And given the size and scope of this disaster, that could be months or even years from now.

Tuesday, May 17, 2011

IAEA To Send Fact Finding Mission To Fukushima

 


# 5558

 

 

The UN’s Atomic Energy Agency (IAEA) will dispatch an expert fact-finding mission to Japan on May 24th to  make a preliminary assessment of nuclear safety issues at the Fukushima Daiichi nuclear power plant following the March 11th earthquake and Tsunami.

 

The press announcement reads:

 

Press Release 2011/06

IAEA Sends International Fact-finding Expert Mission to Japan

17 May 2011 | The International Atomic Energy Agency will dispatch an international expert fact-finding mission to Japan.

 

Based upon the agreement between the IAEA and the Government of Japan, the mission, comprising nearly 20 international and IAEA experts from a dozen countries, will visit Japan between 24 May and 2 June 2011. Under the leadership of Mr. Mike Weightman, HM Chief Inspector of Nuclear Installations of the United Kingdom, the mission will conduct fact-finding activities at Tokyo Electric Power Company's Fukushima Dai-ichi Nuclear Power Station (NPS) site and in other locations.

 

The expert mission will make a preliminary assessment of the safety issues linked with TEPCO's Fukushima Dai-ichi NPS accident following the Great East Japan Earthquake and Tsunami. During the mission, areas that need further exploration or assessment based on the IAEA safety standards will also be identified.

 

In the course of the IAEA mission, the international experts will become acquainted with the Japanese lessons learned from the accident and will share their experience and expertise in their fields of competence with the Japanese authorities.

 

Mr. Weightman will present the mission's report at the Ministerial Conference on Nuclear Safety organised by the IAEA in Vienna from 20 to 24 June 2011, as an important input in the process of reviewing and strengthening the global nuclear safety framework that will be launched by the Conference.

 

Updates on the situation at the damaged Fukushima facility are coming less frequently from the IAEA, with the last one issued on Friday May 13th.

 

IAEA Briefing on Fukushima Nuclear Accident (4 - 11 May 2011, 17:00 UTC)

by International Atomic Energy Agency (IAEA) on Friday, May 13, 2011 at 12:27pm

On Friday, 13 May 2011, the IAEA provided the following information on the status of nuclear safety in Japan:

1. Emergency at Fukushima Daiichi Nuclear Power Plant

Overall, the situation at the Fukushima Daiichi nuclear power plant remains very serious.

(Continue . . . )

 

 

Each day, however, seems to bring new revelations on the extent of the damage to the fuel rods at the damaged reactors and revised plans to rectify the crisis.

 

The following report comes from the Voice Of America.

 

 

Japan Revises Plan to Bring Fukushima Reactors Under Control

Martyn Williams | Tokyo  May 17, 2011

Workers wearing protective suits are seen near cable trench pit for the water intake of No.2 reactor at Tokyo Electric Power (TEPCO) Co.'s Fukushima Daiichi Nuclear Power Station in Fukushima prefecture in this handout photo taken on May 6, 2011 and relea

Photo: Reuters

Workers are seen near cable trench pit for the water intake of No.2 reactor at Tokyo Electric Power (TEPCO) Co.'s Fukushima Daiichi Nuclear Power Station in Fukushima prefecture in this handout photo released by TEPCO on May 17, 2011

Tokyo Electric will step up measures to prevent groundwater contamination at the stricken Fukushima nuclear-power plant amid worries that highly radioactive water is leaking from the core of at least one reactor.

 

Company officials say work will begin immediately to build a drainage system that will pump the water to a reprocessing facility where much of the radioactivity can be removed. It will then be re-circulated through the cooling system.

 

Recent data analysis concluded a meltdown of nuclear fuel likely occurred within a day of the March 11 earthquake and tsunami that devastated the region. The melted fuel is thought to have created holes allowing water to leak from the center of the reactor.

 

The work is one of the new measures in Tokyo Electric's plan for taking the Fukushima Daiichi plant from crisis to stability. Other measures will be visually apparent at the plant in the coming months.


(Continue . . . )

 

 

That more than two months later the story continues to evolve regarding the hours and days immediately following the disaster should come as no great surprise.

 

As I wrote in The Fog Of Disaster Reporting, two days after the earthquake struck:

 

Early reports from the ground during any major disaster are usually fragmentary, often misleading, and occasionally just downright wrong.

 

Over the past 60 days, we’ve seen our share of `erroneous’ reports.

 

Obviously, it is important to learn exactly what happened at Fukushima, what responses were mounted, and what worked . . .  and what didn’t.

 

While one always hopes another disaster of this sort never happens, there are lessons to be learned here. Particularly from the things that did not work as planned.

 

Lessons that could save lives the next time the `unthinkable’ happens.

Monday, April 25, 2011

NSC: Fukushima Radiation Leak Underestimated

 

 

# 5519

 

image

Photo credit IAEA

 

Six weeks after the combination earthquake and tsunami that devastated Japan and severely damaged several nuclear reactors we continue to get revised estimates on the amount of radioactivity that has been (and is being) released into the atmosphere.

 

On April 5th, Japan’s Nuclear Safety Commission (NSC) estimated that the release of radiation from the Fukushima No. 1 nuclear power plant as being "less than 1 terabecquerel per hour."

 

Which would make the daily release somewhat under 24 terabecquerels.

 

Today the Daily Yomiuri (Yomiuri Shimbun) (h/t Makoto on FluTrackers)  is reporting that the NSC revised their estimates over the weekend, raising them to 154 terabecquerels per day as of April 5th.

 

Or a rate at least 6 times higher than previously stated.

 

This report from the Yomiuri Shimbun.

 

Atmospheric radiation leak underestimated

The Yomiuri Shimbun

Data released by the government indicates radioactive material was leaking into the atmosphere from the Fukushima No. 1 nuclear power plant in early April in greater quantities than previously estimated.

 

Radioactive material was being released into the atmosphere from the plant at an estimated rate of 154 terabecquerels per day as of April 5, according to data released by the Cabinet Office's Nuclear Safety Commission on Saturday.

 

The NSC previously estimated radiation leakage on April 5 at "less than 1 terabecquerel per hour."

(Continue . . .)

 

 

Given that TEPCO’s plans don’t call for stopping the radiation release for another 2 or 3 months, this is less than encouraging news.

Thursday, April 14, 2011

Fukushima: A 10-Year Decommissioning Plan

 

 

 

# 5492

 

 

Although a decade is a long time to deal with a crisis, compared to other estimates (see ABC News Crews 'facing 100-year battle' at Fukushima), today’s report actually sounds optimistic.

 

image

Photo credit IAEA

 

The plan comes from manufacturing giant Toshiba, which helped build the Fukushima Daiichi plant, and was generated in consort with 4 US companies in the nuclear industry.


It envisions a 3-phase decommissioning and cleanup strategy, with the first phasecooling and stabilizing the reactors and spent fuel pools – expected to take several months

 

Phase II – removing the nuclear fuel rods – would take 5 years.

 

And Phase III - dismantling the reactors and environmental cleanup – will take another 5 years.

 

NHK World News has more in the following report:

 

Reactor makers draft 10-year decommission plan

updated at 13:57 UTC, Apr. 14

Monday, April 11, 2011

Fukushima: Brief Fire, 6.4 Aftershock & Severity Level To Be Raised

 

 


# 5485

 

 

According to NHK World News Japan’s Nuclear Safety Agency today has decided to raise the severity level of the multiple crises at the Fukushima Nuclear facility from a 5 (on par with Three Mile Island) to a 7 – the same level assigned to the 1985 Chernobyl disaster.

 

It is still believed that the amount of radiation released at the Fukushima plant is less than what was released at Chernobyl, however.

 

This decision comes a month after the devastating 9.0 earthquake and tsunami that disabled and severely damaged at least 4 reactors at the Fukushima Daiichi facility.

 

An announcement will be made via a press conference to be held Tuesday morning (Japan Time).  

 

This from NHK News.

 

 

Japan to raise Fukushima crisis level to worst

Tuesday, April 12, 2011 05:47 +0900 (JST)

The Japanese government's nuclear safety agency has decided to raise the crisis level of the Fukushima Daiichi power plant accident from 5 to 7, the worst on the international scale.

The Nuclear and Industrial Safety Agency made the decision on Monday. It says the damaged facilities have been releasing a massive amount of radioactive substances, which are posing a threat to human health and the environment over a wide area.

(Continue . . . )

 

 

In other news, a brief fire broke out at reactor # 4 a short time ago (around 6:30 am local time), but appears now to be extinguished.  The following report is from Reuters.

 

 

Fire seen at Fukushima nuclear plant; flames no longer visible

  • Mon Apr 11, 2011 7:53pm EDT

(Reuters) - A fire broke out at Japan's crippled Fukushima Daiichi nuclear power plant, operator Tokyo Electric and Power (TEPCO) said on Tuesday, although flames and smoke were no longer visible.

(Continue . . . )

 

 

And another strong (6.4 Mag), very shallow (13.1 km) aftershock struck just after 8am local time,  77 km ESE of Tokyo.  No Tsunami warning was issued, and thus far there are no reports of fresh damage or injuries.

 

 

image

MAP 6.4  2011/04/11 23:08:16  35.406   140.542 13.1 
NEAR THE EAST COAST OF HONSHU, JAPAN

Friday, April 08, 2011

Japan: IAEA Briefing April 8th

 

 


# 5477

 

 

In the wake of a 7.1 magnitude aftershock yesterday, the IAEA has issued a new briefing that includes status updates on several other nuclear reactors in northern Japan.

 

Yesterday’s temblor was the largest aftershock yet since the March 11th 9.0 quake that generated a massive tsunami, devastated northern Japan, and severely damaged several nuclear reactors.

 

The IAEA continues to categorize the status of these damaged reactors by stating: 

 

Overall, the situation at the Fukushima Daiichi plant remains very serious although there are early signs of recovery in some functions such as electrical power and instrumentation.

 

I’ve only reproduced the opening section which pertains to this latest aftershock’s effects on Japan’s nuclear facilities. 

 

Follow the link to read this update in its entirety.

 

 

IAEA Briefing on Fukushima Nuclear Accident (8 April 2011, 15:00 UTC)

by International Atomic Energy Agency (IAEA) on Friday, April 8, 2011 at 10:57am

1.      Earthquake of 7th April

The IAEA confirms that an earthquake occurred in Japan at 14:32 UTC 7th April. The IAEA International Seismic Safety Centre has rated it as a 7.1 magnitude, revised from an initial 7.4 magnitude.

The epicenter of the earthquake was 20 km from the Onagawa nuclear power plant and approximately 120 km from the Fukushima Daiichi and Daini nuclear power plants.

 

The IAEA has been in contact with NISA and can confirm the status of the following nuclear facilities:

Fukushima Daiichi NPP

No changes have been observed at the on-site radiation monitoring posts. The injection of water into the reactor pressure vessels of Units 1, 2 and 3 was not interrupted.

Fukushima Daini NPP

No changes have been observed of the readings at the on-site radiation monitoring posts.

Onagawa NPP

All reactors have been in cold shutdown since the 11th March earthquake.

 

Two out of the three lines supplying off-site power to the site were lost following the 7th April earthquake. Off-site power continues to be supplied through the third line.

 

Cooling of the spent fuel pool was temporarily lost, but has subsequently been restored.

 

No change has been observed in the readings from the on-site radiation monitoring post. The status of the plant is currently being checked.

Tokai Daini NPP

Tokai Daini nuclear power plant remains in cold shutdown since the 11th March earthquake. No abnormality has been observed.

Higashidori NPP

The Higashidori NPP was shut down and in a maintenance outage at the time of the 7th April earthquake. Off-site power was lost temporarily. Emergency power supply to the site operated as expected until off-site power was restored. All the fuel had been removed from the reactor core and stored in the spent fuel pool. Cooling of the spent fuel pool is operational.

Tomari NPP (in Hokkaido)

At the time of the 7th April earthquake Tomari Unit 1 and Unit 2 were in operation. Following the 7th April earthquake, the Hokkaido Electric Power Company reduced the generating power to 90% of capacity.

Rokkasho Reprocessing Plant

Rokkasho Reprocessing Plant and uranium enrichment facility lost off-site power. Emergency power supply to the site is operating.

(Continue . . . )

 

 

 

Seismologists warn that additional strong aftershocks are still possible over the next few weeks and months.

Tuesday, April 05, 2011

NHK: Fukushima Leak `Appears To Be Lessening’

 

 

 

 

# 5464

 

Anything remotely resembling optimism on the damaged reactors at the Fukushima nuclear facility has been exceedingly hard to find over the past 3 weeks.

 

Since the March 11th earthquake and tsunami we’ve watched a steady stream of stories on radiation releases and TEPCO’s failed attempts to stop them coming from the press.

 


Today, however, from NHK World News; a bit of optimism on TEPCO’s attempts to reduce the flow of highly radioactive water leaking from the reactor into the sea.

 

After several failed attempts, the injection of liquid glass into the concrete pit appears to have lessened somewhat the rate of flow of radioactive water and further injections are planned.

 

Whether this leak can be permanently sealed remains to be seen.

 

This from NHK World News.

 

 

Leak at Fukushima appears to be lessening

The operator of the crisis-hit Fukushima nuclear plant has injected a hardening agent beneath a leaking concrete pit in a bid to stem the flow of highly radioactive water into the sea.

 

The firm says the leakage seems to be decreasing, following the infusion of the hardening agent.

 

The utility showed reporters a photo of the leak on Tuesday evening, saying it indicates such a decrease.
TEPCO said it will infuse another 1,500 liters of liquid glass.

 

(Continue . . . )

 

Elsewhere, the news isn’t nearly as optimistic, with these reports among the top stories out of Japan today.

 

Fukushima: A Drone’s Eye View

 

 

# 5463

 


A Twitter tweet by @Tokyoreporter this morning has led me to a webpage containing 11 awesome high-res photographs giving us the best view yet of the damaged Fukushima nuclear facility.

 

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Drone used to take photos (Air Photo Service Co. Ltd., Japan)

 

The main page of aerial photos is available for viewing at:

 

http://cryptome.org/eyeball/daiichi-npp/daiichi-photos.htm

 

 

A second page, with 18 more high-res ground level and aerial shots can be found at:

 

http://cryptome.org/eyeball/daiichi-npp2/daiichi-photos2.htm

 

On both pages are links to download the full resolution photos in a zip file.

Sunday, March 27, 2011

Fukushima: Radiation Levels Soar At Reactor # 2 ?

 

 

UPDATED: 0850 Hrs EDT 03/27/11

 

AP is now reporting that TEPCO officials are claiming the radiation readings reported earlier were `a mistake’ and `not credible’.  New measurements will be taken, according to this AP report:

 

Japan: Huge radiation spike at nuke was a mistake

By YURI KAGEYAMA and MARI YAMAGUCHI
Associated Press

 

 

When new, revised radiation readings will be made available wasn’t stated.

 

Stay tuned . . .

 

 

# 5452

 

 

This morning it is being widely reported that the latest readings from inside the reactor buildings, and the land and sea surrounding the Fukushima nuclear plant, continue to show rising levels of radiation.  

 

In one place in particular – in the basement of the turbine building connected to reactor #2, the levels are being characterized as `extreme’; 10-million-times greater than normal.

 

TEPCO officials, however, appear to be disputing some of these readings.  

Details are scant, but at least one Japanese news source  (hat tip Tokyoreporter on Twitter) is carrying a denial of the extreme radiation levels by  a TEPCO Vice President .

 

 

This report from the Voice of America (VOA).

 

Radioactivity Soars at Japan Nuclear Plant

Martyn Williams | Tokyo  March 27, 2011

Japan says levels of radiation contamination in water inside part of the Fukushima nuclear power plant have increased sharply.  Workers at the plant spent the day Sunday on improvements to the water pumping system that is keeping the reactors cool.

 

The level of radioactive Iodine-134 in water in the basement of a turbine building adjoining the plant's Number-2 reactor spiked to more than 10 million times that of normal conditions.

 

At that level it is a thousands times more radioactive than water found in the neighboring Number-1 and -3 reactor buildings. It was in the Number-3 building on Thursday that two workers sustained heavy radiation contamination after standing in water without wearing boots.

 

Government officials and plant operators say they are not sure where the radioactive contamination is coming from.  But there is a possibility it is coming from the reactor core.

(Continue . . . .)

 

A second report from NHK World News provides a few more details:

 

Extreme radiation detected at No.2 reactor

Sunday, March 27, 2011 13:44 +0900 (JST)

Tokyo Electric Power Company says it has detected radioactive materials 10-million-times normal levels in water at the No.2 reactor complex of the Fukushima Daiichi nuclear plant.

<SNIP>


TEPCO says the radioactive materials include 2.9-billion becquerels of iodine-134, 13-million becquerels of iodine-131, and 2.3-million becquerels each for cesium 134 and 137.

(Continue . . . )

 

 

These isotopes vary greatly in their persistence in the environment, with radioactive iodine 134 having a half-life of just 53 minutesiodine 131 with a half-life of 8 days, and cesium 137 with a half-life of 30 years.

 

The radioactive Iodines will decay relatively quickly, and should pose only a short-term threat (once the release ends), but isotopes such as cesium 137 decay far more slowly, and can persists for hundreds of years.

 

The measurement of becquerels is a reading of total radioactivity, but doesn’t convert easily to the dose of radiation  (sievert) that one would receive if exposed.

 

Since the `safe’ level of radioactivity in tap water in Japan is set at 300 becquerels per liter, and the water here is being measured in the billions of becquerels per milliliter . . .  suffice to say – if accurate - this is an extremely high level of radiation.

 

 

Meanwhile, NHK World News is reporting that radiation levels roughly 30 km from the stricken plant (outside of the evacuation radius) are rising as well.  These readings, you will notice, were taken last Wednesday.

 

 

image

(NHK News Video Capture)

High radiation detected 30 km from Fukushima plant

Sunday, March 27, 2011 08:53 +0900 (JST)

Radiation levels 40 percent higher than the yearly limit for the general public has been detected just over 30 kilometers from the Fukushima Daiichi power plant.

 

The Science Ministry says a reading of 1.4 millisieverts was taken on Wednesday morning in Namie Town northwest of the plant.

 

The government has not told residents outside the 30-kilometer radius of the plant to evacuate, or even to stay indoors.


Someone staying outdoors for 24-hours at that location would exceed the annual limit of one millisievert. The limit is based on a recommendation by the International Commission on Radiological Protection.

(Continue . . . )

 

 

And lastly, we have this IAEA update indicating that attempts to remove water from the damaged reactor buildings are either underway, or planned.

 

Fukushima Daiichi Nuclear Accident Update (27 March, 9:00 UTC)

by International Atomic Energy Agency (IAEA) on Sunday, March 27, 2011 at 4:51am

According to the Japanese Prime Minister’s office, TEPCO has begun work to remove water that has accumulated in the turbine buildings at the Fukushima Daiichi nuclear power plant. Workers have started to remove water from the Unit 1 turbine building to its main condenser and are making preparations to do the same at Unit 2. (A main condenser’s function in a nuclear power plant is to condense and recover steam that passes through the turbine.) Work to remove water from the turbine buildings in Units 3 and 4 is currently under consideration.

 

Removal of water from the turbine buildings is an important step to continue power restoration to the plant.

 

The IAEA is seeking further updates from Japanese authorities on the progress of this process and will update as information becomes available.

Saturday, March 26, 2011

The IAEA Presentations Channel

 

 

# 5451

 

 

The International Atomic Energy Agency (IAEA) has selected Slideshare to host documentation, slide shows, and other presentations on the Japanese nuclear crisis. 

 

You can access (as of this writing) 26 presentations, and 6 documents at the IAEA Presentations Channel.

 

image

 

 

Some of these are multi-slide presentations while others are informative single page charts and graphics, like the one below:

 

image

 

A resource very much worth checking every day or so.

Friday, March 25, 2011

Fukushima: Voluntary Evacuation Urged in 20km - 30km Radius Zone

 

 

 

# 5443

 

 

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Voluntary evacuation urged in the red shaded zone.

Graphic NHK World News 

 

 

 

Chief Cabinet Secretary Yukio Edano told reporters today that residents living between 20km and 30km of the damaged Fukushima reactor should consider voluntary evacuation at this time to avoid further hardship.

 

Citing severe living conditions brought on - in part - due to harsh disruptions of essential services and breaks in the local supply/distribution chain, he urged those who have remained in the `stay indoors’ zone for the past two weeks to consider leaving.

 

He also stated that depending upon radiation levels, the government could extend the mandatory evacuation zone in the coming days.

 

 

NHK World News has an article and a video report on this story at:

 

Edano: Voluntary evacuation from 20-30 km advised

Friday, March 25, 2011 13:17 +0900 (JST)

Thursday, March 24, 2011

Fukushima IAEA Updates: March 24th

 

 


# 5441

 

 

The IAEA has posted as series of updates on the Fukushima nuclear reactors on their website and their Facebook Page.

 

 

You can view the most recent updates at:

Fukushima Nuclear Accident Update Log

 

Table: Summary of reactor unit status at of 24 March-0600 UTC

image 

 

 

 

Fukushima Daiichi Nuclear Accident Update (24 March, 17:30 UTC)

Japanese Seawater Samples Show Signs of Radioactive Materials

Japanese authorities today provided the IAEA with data on seawater samples they collected on 22 and 23 March, after detecting iodine and cesium in the water near the Fukushima Daiichi nuclear power plant. (See earlier update.)

 

A vessel from the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) collected water samples at several points 30 kilometres from the coastline and found measurable concentrations of iodine-131 and cesium-137.

The iodine concentrations were at or above Japanese regulatory limits, and the cesium levels were well below those limits.

 

The IAEA's Marine Environmental Laboratory in Monaco has received the data for review.

 

Fukushima Daiichi Nuclear Accident Update (24 March 17:25 UTC)

Japanese Workers Treated for Radiation Exposure

Japanese authorities today reported that three workers at the Fukushima Daiichi nuclear power plant were exposed to elevated levels of radiation. The three were working in the turbine building of reactor Unit 3 and have received a radiation dose in the range of 170-180 millisieverts.

Two of the workers have been hospitalized for treatment of severely contaminated feet, which may have suffered radiation burns. The workers had been working for about three hours in contact with contaminated water.

 

Fukushima Daiichi Nuclear Accident Update (24 March 2011, 14:00 UTC)

by International Atomic Energy Agency (IAEA) on Thursday, March 24, 2011 at 10:29am

Spent Fuel Pools at Fukushima Daiichi Nuclear Power Plant - Updated

Spent fuel removed from a nuclear reactor is highly radioactive and generates heat. This irradiated fuel needs to be stored for one to three years in pools that cool the fuel, shield the radioactivity, and keep the fuel in the proper position to avoid fission reactions. If the cooling is lost, the water can boil and fuel rods can be exposed to the air, possibly leading to severe damage and a large release of radioactive materials.

 

Nuclear power plants must replace fuel every one to two years, and the Fukushima Daiichi reactors typically remove about 25 percent of the reactor's fuel -- to be replaced with fresh, or unirradiated, fuel -- during each refuelling outage. The spent fuel, which is hottest immediately after it is removed from the reactor, is placed in the spent fuel pool until it is cool enough to be moved to longer-term storage.

 

The concern about the spent fuel pools at Fukushima Daiichi is that the capability to cool the pools has been compromised. See diagram below for location of the pool in each reactor building.

For more, see...http://www.iaea.org/newscenter/news/tsunamiupdate01.html

 

Monday, March 21, 2011

Fukushima: Monday Morning Roundup

 

 


# 5426

 

 

Radiation contamination fears, and smoke or steam emissions from two of the reactors at the Fukushima energy plant, top the list of developments in the Japan’s ongoing nuclear crisis.

 

First, regarding the mysterious smoke/steam seen coming from reactor 2 & 3, NHK World News reports:

 

Grey smoke from No.3 reactor subsided

The grey smoke seen coming from the troubled No.3 reactor of the Fukushima Daiichi nuclear power plant on Monday afternoon has subsided.

 

The plant's operator, Tokyo Electric Power Company, evacuated its workers from the plant shortly after 4 PM.

 

The government's nuclear safety agency said the smoke, which turned black and grey, subsided about 2 hours later.

(Continue . . . )

 

 

2nd reactor emits smoke

Smoke was seen rising from another troubled reactor Monday evening.

 

The government's nuclear safety agency says it was informed that white smoke was apparently coming from a crack in the roof of the No.2 reactor structure at 6:20 PM.

 

Similar white smoke had been seen rising from the reactor previously.

(Continue . . . )

 

Out of concern for their safety, some employees working at the plant were pulled back when the smoke and/or steam was detected. However, radiation monitoring equipment around the plant detected no increase in radioactivity during or after the emission was spotted.   

 

Meanwhile relatively low, but nonetheless concerning levels of radiation continue to show up in locally produced food and in some water supplies prompting authorities to issue some advisories and to restrict the shipments of some types of food.

 

Again from NHK World News.

 

This first report states that 5 different types of radioactive materials have been detected near the Fukushima plant, strongly suggesting that some nuclear fuel rods have been damaged in at least one of the reactors.

 

 

5 radioactive materials detected

Tokyo Electric Power Company says some of the nuclear fuel at the Fukushima Daiichi nuclear power plant has apparently been damaged, as higher levels of radioactive materials have been detected in the vicinity.

 

The utility on Monday released the results of a radiation survey carried out at the plant on Saturday.

 

Officials detected in the air 5 radioactive materials that are generated by nuclear fission.

(Continue . . . )

 

And the Dow Jones news service is reporting that Japan's Cabinet Secretary Yukio Edano has ordered the governors of four prefectures (Fukushima, Ibaragi, Tochigi and Gunma) to halt the shipment of spinach and rapeseed after radiation levels above normal were detected in some produce samples.

 

The government has ordered Fukushima prefecture not to sell milk as well.

 

Fears over these abnormal – but still fairly low – levels of radiation run high in the region despite assurances from the Japanese government that short term exposure poses little health risk.

 

In an attempt to allay fears and answer critics who have felt that solid information on the radiation risks were slow to emerge, the Japanese government has begun to post radiation readings from numerous locations across Japan.


This From NHK News.

image

Govt posts radiation data

Japan's science ministry is publishing radiation levels monitored nationwide on its website, with the information also available in English, Korean and Chinese.

 

The ministry's website began showing the data on Saturday, with information updated twice a day.
The ministry is publishing levels of radiation and radioactive materials monitored on the ground, as well as in rain, tap water and the atmosphere.

(Continue . . . )

 

You’ll find the latest reports (in English) on this page:

http://www.mext.go.jp/english/

IAEA Update: The 6 Fukushima Reactors At A Glance

 

 

# 5425

 

 

With 6 separate reactors at the earthquake damaged Fukushima nuclear facility in Japan, and with each experiencing different levels of damage and concerns, keeping their statuses straight based on text reporting has always been tough. 

 

The IAEA helps out with this handy reference chart that shows at a glance the status and color-coded level of concern in a variety of categories for each reactor.

 

image

(Click image to Enlarge)

 

The above graphic appears as part of a lengthy IAEA report released yesterday, updating the situation at the Fukushima facility.  

 

You’ll find a brief excerpt below, but follow the link to read it in its entirety.

 

Japan Earthquake Update (20 March 2011, 21:00 UTC)

(Excerpt)

IAEA Briefing on Fukushima Nuclear Emergency (20 March 2011, 15.30 UTC)

On Sunday, 20 March 2011, Graham Andrew, Special Adviser to the IAEA Director General on Scientific and Technical Affairs, briefed both Member States and the media on the current status of nuclear safety in Japan. His opening remarks, which he delivered at 15:30 UTC at the IAEA headquarters in Vienna, are provided below:

1. Current Situation

 

There have been some positive developments in the last 24 hours, but the overall situation at the Fukushima Daiichi nuclear power plant remains very serious.

 

Efforts to restore electrical power to the site continue. Off-site electrical power has been connected to the local substation for Unit 2 today. Work is continuing under difficult conditions to connect power from the substation to the reactor building. Seawater is still being injected into the reactor pressure vessels of Units 1, 2 and 3. Water injection is not needed for Unit 4 as the reactor is in outage.

 

White smoke or vapour from Unit 3 is still being observed, but it is less intense than on previous days. Spraying of the reactor building with water is in progress.

 

Following an initial rise in pressure in the Unit 3 reactor pressure vessel, plans were made to vent the vessel should it become necessary. However, from information recently provided by NISA they have decided not to vent as the vessel pressure has started to reduce.

 

The situation in the reactor spent fuel pools is relatively stable, but is still of concern. Spraying of water into the pool of Unit 4 started yesterday. The Agency still lacks data on water levels and temperatures at the spent fuel pools at Units 1, 2, 3 and 4.

 

A positive development is that cooling has been restored to the reactor pressure vessels in Units 5 and 6. Temperatures in the spent fuel pools at these two units, which had been rising in the last few days, have now fallen significantly to around 40 degrees centigrade from a maximum of about 69 degrees yesterday. Two diesel generators, one for each Unit, are providing electricity.

(Continue . . .)

Sunday, March 20, 2011

Japan Cites `Some Progress’ In Nuke Crisis

 

 


# 5424

 

 

As I wrote a week ago in The Fog Of Disaster Reporting - trying to make sense of the situation on the ground during a crisis - based on official announcements and media coverage isn’t an easy task.

 

We (the public) are at the end of a very long, damaged, and sometimes biased information pipeline.

 

Officials from TEPCO and the Japan’s government are understandably trying to project an air of confidence during a time of great national tragedy.

 

They want to instill hope that are making the right decisions and that progress is being made dealing with the multiple crises that have devastated northern Japan since the 9.0 Tohoku earthquake of March 11th.

 

With hundreds of thousands of people in emergency shelters, more than 20,000 dead or missing, a half dozen damaged and unstable nuclear reactors, and an economy nearly grinding to a halt, however, `legitimate’ good news is exceedingly hard to find.

 

Which is why government and power company officials tend to stress the silver lining in any progress report or press conference, while some (but certainly not all) segments of the media are focused primarily on worst case scenarios. 

 

And to all that we must add `the fog of disaster’, where incomplete or inaccurate data invariably gets reported.

 

So  what we end up with are confusing, often conflicting media reports, occasionally followed by retractions and `clarifications’ hours later. 

 

All of which makes it very difficult to know what to believe.

 

Still, there appear to be some glimmers of hope amid the steady stream of bad news.  A few headlines from the wires this morning.

 

 

First, from NHK World News.

 

TEPCO says radiation levels continue to decline

Tokyo Electric Power Company says radiation levels around the compound at its Fukushima Daiichi nuclear plant are on the decline since water-spraying began in earnest on Saturday afternoon.

 

The company told reporters that the radiation level at the plant's headquarters building, located some 500 meters northeast of the No. 3 reactor, dropped to 2,625 microsieverts per hour at 8:30 on Sunday morning.

 

The reading shows a drop of more than 800 microsieverts from 18 hours ago--about the time the water-spraying at the No.3 reactor began.

Sunday, March 20, 2011 11:49 +0900 (JST)

Water temperature drops in fuel rod pools

The water temperature is dropping in the spent fuel rod pools of the No.5 and No.6 reactors at the Fukushima Daiichi nuclear power plant.
The Tokyo Electric Power Company restored a power generator at the No.6 reactor on Saturday morning.

(Continue . . . )

 

 

No gases to be released from No. 3 reactor

The Tokyo Electric Power Company has decided against releasing gases from the overheating No. 3 reactor in an attempt to reduce pressure inside the containment vessel.

 

TEPCO officials in Fukushima said on Sunday afternoon that pressure within the reactor containment vessel has begun to stabilize, and gases don't need to be released for the time being.

 

(Continue . . .)

 

 

 

Kyodo News reports on the progress being made on hooking up the external power cables to the cooling pumps at the Fukushima reactor.

 

Tension remains in Fukushima plant, electricity partially installed

TOKYO, March 20, Kyodo

Japan's quake-hit Fukushima Daiichi nuclear power plant saw a stable source of electricity finally reach one of its crippled nuclear reactor building Sunday, a key step to move ahead in restoring the reactors cooling functions to avoid the disaster from worsening further.

(Continue . . . )

 

And lastly Reuters offers this roundup of recent news reports out of the Fukushima crisis.

 

Snapshot: Japan's nuclear crisis

TOKYO (Reuters) – Following are main developments after a massive earthquake and tsunami devastated northeast Japan and crippled a nuclear power station, raising the risk of uncontrolled radiation.

(Continue . . .)

 

 

As always, Caveat Lector.