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    原発問題 -The Truth is Out There-

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    東電福島原発事故の真実 放射能汚染の真実 食物汚染の真実 正しい情報を求めて

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    英政府はフクシマの事故でチェルノブイリの倍近い992万テラベクレルを放出を覚悟していた 

    英政府 チェルノブイリの倍近い 「リーズナブルな最悪ケース・シナリオ」を覚悟 992万テラベクレルを放出 放射能雲、東京、仙台を襲う メルトダウン爆発の「メカニズム」 なお存在 英紙ガーディアンが情報自由法で政府内部文書を入手
    2011-06-21 Posted by 大沼安史 at 12:48 午後

    英紙ガーディアンは「情報自由法」を使い、英政府機関が「フクシマ」事故をどう評価し、どんな対策をとっていたかを示す、非公開の公文書を入手し、内容を報じた。

    それによると、英政府は「リーズナブルな最悪ケース・シナリオ」として、フクシマで地震前まで運転していた3機の原子炉のすべてが将棋倒しで(ドミノ式に)破壊され、6基の「使用済み核燃料プール」の棒社製物質が放出される事態を想定。

     3機の原子炉からは炉心の放射性のヨウ素、セシウムの10%、プールからは放射性セシウムの3分の1が放出され、風向きによっては東京、仙台を襲う事態を覚悟していた。

     それによって大気中に放出される放射性ヨウ素(換算の放射性物質の)総量は、992万テラベクレル。チェルノブイリの520万テラベクレルの倍近い膨大なものになると予想していた。

     このため英国の日本大使館は、「重大な放出」が起きた時のための「アドバイス」を作成、事故後1週間以内にヨード剤を在日英国人に配給するとともに、「日本政府が退避の指示を出すか、英政府が指示したら服用するよう」指示していた。

     日本政府は4月になって「フクシマ」が「レベル7」の重大事故であったことを認めたが、英政府の「非常事態科学勧告グループ(Sage)」に同月、提出された原子力規制局などの政府機関合同の報告書は、「重大な放出に至りうるメカニズムに変化はない。すなわち、核燃料溶融物がプールや炉のコンクリートの基礎と接触し爆発がするメカニズムに変化はない」としている。

     (英政府の関係政府機関はその時点でも、チェルノブイリの倍近い放出の大爆発が起こり得ると、一致した見方をしていたわけだ)

     なかでも、ガーディアン紙が入手した非公開文書のひとつは、「使用済み核燃料が過熱して溶けてプールの底にたまり、「臨界」に至って、「フレッシュな放射性物質の放出を、一定期間にわたって続ける」恐れを指摘している。

     ガーディアンの情報自由法による開示請求に対して、英政府はかなりの数の関係文書を「国際関係」に配慮して開示しなかった。
     (日本政府の対応のまずさなどを指摘した文書が含まれているようだ)

     同紙(電子版)の記事には、入手文書のひとつが添付されているが、それによると、英政府は日本のSPEED?と同じようなSEERという拡散モデルを使って、「フクシマ」発の放射能雲の行方を予測していた。

     事故発生後、東京の英国大使館がバスを仕立て、一般車両通行禁止の東北自動車道を突っ切って、仙台まで英国人の救出に来た理由が、これでようやく分かった。

     チェルノブイリの倍近い最悪事故。

     その「メカニズム」にその後も変化なし、というのだから恐ろしい。

     仙台の在日英国人を必死になって救おうとした英国政府と、「爆発的事象」「ポン」などといい続け得て、大規模住民避難のため1台のバスも出さなかった日本政府と。

     「直ちに男」枝野長官らの罪は重く、大きい。

    以下原文

    UK government's Fukushima crisis plan based on bigger leak than Chernobyl
    Exclusive: As Japan's nuclear emergency unfolded, scientists devised a worst case scenario involving issuing iodine pills to Britons

    Ian Sample, science correspondent
    guardian.co.uk, Monday 20 June 2011 20.38 BST
    Article history

    The British government made contingency plans at the height of the Fukushima nuclear crisis which anticipated a "reasonable worst case scenario" of the plant releasing more radiation than Chernobyl, new documents released to the Guardian show.

    The grim assessment was used to underpin plans by the British embassy in Tokyo to issue protective iodine pills to expats and visitors. It also prompted detailed plans by Cobra, the government's emergency committee, to scramble specialist teams to screen passengers returning from Japan at UK airports for radioactive contamination.

    The UK government's response to the unfolding crisis is revealed in documents prepared for Sir John Beddington, the chief scientist and chair of the Scientific Advisory Group for Emergencies (Sage), and released to the Guardian under the Freedom of Information Act. The 30 documents include advice from the National Nuclear Laboratory on damage to the plant, public safety assessments from the Health Protection Agency (HPA), computer models of the radioactive plume from Defra's Radioactive Incident Monitoring Network (Rimnet), and the worst case scenario that might unfold at the plant.

    A substantial number of documents were withheld on grounds that they contained "information which, if disclosed, would adversely affect international relations," the government's civil contingencies team said.

    The earthquake and tsunami, which hit Japan in March, knocked out critical cooling systems at the Fukushima plant, prompting immediate fears that nuclear fuel in the reactors could melt through their pressure vessels and drop onto the concrete floor beneath, causing a "corium explosion" and a major release of radiation. There were similar concerns over hundreds of spent fuel rods packed into storage pools above the reactors.

    To avert nuclear meltdown, Japanese emergency teams worked frantically to rig up mobile power supplies and pump water into the reactors, while the storage ponds were doused with water from helicopters, military fire trucks and an enormous remote-controlled concrete pump.

    The documents reveal how the British government scrambled to build up a clear picture of the crisis and the danger it posed in the days and weeks after the earthquake struck.

    In the first week, advisers wrestled with conflicting information on the amount of spent fuel at the Fukushima site, but settled on a figure of 4,500 fuel rods in six ponds, or enough to power eight reactor cores. A separate fuel pond, known as the common pool, was "full to the gunnels," one unnamed adviser wrote.

    A fear raised in one document was that spent fuel rods might overheat, melt and slump to the bottom of their storage pools where enough could gather to "go critical", that is, restart nuclear reactions. The likely result of that, the paper states, would be releases of fresh radioactive material, "which could continue for some time".

    In further statements, government advisers admitted insufficient expertise to work out how high an explosion might blast radioactive material, but warned that an explosion at one reactor or fuel pond could trigger a domino effect as other reactors and the spent fuel ponds became too dangerous to deal with. The "reasonable worst case scenario" envisaged ruptures at all three reactors in operation before the earthquake, and radiation leaks from six spent fuel ponds at the Fukushima site.

    The Nuclear Installations Inspectorate estimated this would release 10% of the radioactive caesium-137 and iodine-131 in the cores and one third of the caesium-137 in the spent fuel ponds. Under that scenario, wind currents carried the plume directly towards Tokyo at a speed of five metres per second. Had the event happened, it could have released the equivalent of 9.92 million terabecquerels of radiation from iodine-131 into the open air, nearly double the 5.2 million terabecquerels released by the fire at the Chernobyl nuclear reactor in Ukraine in 1986.

    Even in this worst case scenario though, the accident was expected to cause less harm than Chernobyl, where the reactor's burning graphite core threw radioactive material high into the atmosphere, and local populations were not evacuated quickly or barred from consuming contaminated milk and other products.

    The documents show how seriously the risk to Britons in the Japanese capital Tokyo and Sendai, a major city 70 miles from the stricken plant, was taken. A week into the crisis, the British embassy distributed iodine pills as a contingency measure.

    Meanwhile, the HPA prepared advice to be published in case a major leak occurred. It explained what time the radioactive plume would reach either Tokyo or Sendai, depending on the wind direction and stated: "When the Japanese authorities instruct you to shelter you should take the first dose, or if the UK government gives you additional information."

    On 25 March, two weeks after the tsunami struck, the government's emergency Cobra committee asked the HPA to draw up detailed plans to monitor air passengers for radioactive contamination as they arrived from Japan. The agency proposed monitoring all passengers if a major leak arose that could cause "some health concern", and limited monitoring to reassure the public at the government's request.

    HPA documents show it had a team ready to monitor passengers landing at Heathrow within 24 to 36 hours of Cobra's request. The agency expected to start passenger screening if a major radiation leak from the plant led to predicted doses of more than six milliseverts in people beyond the 80km exclusion zone. But the agency warned it would struggle to monitor all passengers arriving from Japan at more than two airports, even if it borrowed detectors from the Atomic Weapons Establishment in Berkshire.

    In April, the Fukushima incident was upgraded to a level seven, the maximum, on the International Nuclear and Radiological Event Scale. According to Japan's Nuclear Safety Commission, the accident led to a release of radiation equivalent to 630,000 terabecquerels of iodine-131. That month, a joint paper to Sage from the Office of Nuclear Regulation, the Met Office, the HPA and Rimnet stated: "The mechanism that could lead to a serious release remains unchanged, ie molten fuel coming into contact with the concrete base of a pond or reactor causing an explosion."

    Other papers prepared for Sage outline the possible long term impact of the accident, which could see restrictions on food supplies in place for years and some regions around the plant ruled permanently out of bounds.

    Workers at the site are still facing high radiation levels and contaminated waste water to keep three reactors and several ponds of spent fuel under control.

    Report lists safety flaws

    Protection added to Japan's nuclear plants after a 2002 review of tsunami risks fatally underestimated the hazards that emerged in the Fukushima disaster, the first independent assessment of the has found.

    A report published on Monday by the International Atomic Energy Agency also found that:

    • Regulators had failed to review or approve the improved defences.

    • Accident plans could not cope with multiple plant failures.

    • Sites have no seismically robust buildings to shelter emergency teams.

    • Instruments essential to monitoring reactors were not sufficiently "hardened" against accidents

    • The risks of hydrogen explosions was underestimated.

    • There were "dedicated and devoted" workers available but in the crisis "complicated structures and organisations" resulted "in delays in urgent decision making".

    Launching a four-day ministerial summit on nuclear safety in Vienna, the IAEA's head, Yukiya Amano, urged a worldwide review of measures to prevent future disasters.

    But he added: "Even the best safety standards are useless unless they are actually implemented."

    http://www.guardian.co.uk/science/2011/jun/20/japan-earthquake-and-tsunami-japan

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