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<<   作成日時 : 2011/08/03 23:51   >>

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福島原発の高放射能スポット
 労働者に危険な致死性高放射能レベルのスポットが福島第一原発で検出された。10シーベルト/h以上の放射能が2つの原子炉間の排気筒の下部で見つかった。ほんの数秒でも危険であり、機器の測定限界を超えており正確な線量は不明である。他にも高レベルの場所が見つかるかもしれない。
 施設労働者は年間250ミリシーベルトの被曝が許容されているに過ぎない。原発事故処理のスケジュールに影響を与えるだろう。
 高レベルの場所は、原発事故直後の緊急時にベントによりデブリが放出されたことによると推定される。

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Pockets of high radiation remind of Fukushima plant danger
http://www.reuters.com/article/2011/08/02/us-radiation-fukushima-idUSTRE77147N20110802

TOKYO | Tue Aug 2, 2011 3:07pm EDT

画像(Reuters) - Pockets of lethal levels of radiation have been detected at Japan's crippled Fukushima Daiichi nuclear plant in a fresh reminder of the risks faced by workers battling to contain the worst nuclear accident since Chernobyl.

Plant operator Tokyo Electric Power (Tepco) reported on Monday that radiation exceeding 10 sieverts (10,000 millisieverts) per hour was found at the bottom of a ventilation stack standing between two reactors.

On Tuesday Tepco said it found another spot on the ventilation stack itself where radiation exceeded 10 sieverts per hour, a level that could lead to incapacitation or death after just several seconds of exposure.

The company used equipment to measure radiation from a distance and was unable to ascertain the exact level because the device's maximum reading is 10 sieverts.

While Tepco said the readings would not hinder its goal of stabilizing the Fukushima reactors by January, experts warned that worker safety could be at risk if the operator prioritized hitting the deadline over radiation risks.

"Radiation leakage at the plant may have been contained or slowed but it has not been sealed off completely. The utility is likely to continue finding these spots of high radiation," said Kenji Sumita, a professor at Osaka University who specializes in nuclear engineering.

"Considering this, recovery work at the plant should not be rushed to meet schedules and goals as that could put workers in harm's way. We are past the immediate crisis phase and some delays should be permissible."

Workers at Daiichi are only allowed to be exposed to 250 millisieverts of radiation per year.

Tepco, which provides power to Tokyo and neighboring areas, said it had not detected a sharp rise in overall radiation levels at the compound.

"The high dose was discovered in an area that doesn't hamper recovery efforts at the plant," Tepco spokesman Junichi Matsumoto told reporters on Tuesday.

Although it is still investigating the matter, Tepco said the spots of high radiation could stem from debris left behind by emergency venting conducted days after the March 11 earthquake and tsunami that crippled the plant.

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Fatal Radiation Level Found at Japanese Plant
By MARTIN FACKLER
Published: August 1, 2011
http://www.nytimes.com/2011/08/02/world/asia/02japan.html

TOKYO ― The operator of the Fukushima Daiichi nuclear plant said Monday that it measured the highest radiation levels within the plant since it was crippled by a devastating earthquake. However, it said the discovery would not slow continuing efforts to bring the plant’s damaged reactors under control.

The operator, Tokyo Electric Power, said that workers on Monday afternoon had found an area near Reactors No. 1 and 2, where radiation levels exceeded their measuring device’s maximum reading of 10 sieverts per hour ― a fatal dose for humans.

The company said the reading was taken near a ventilation tower, suggesting that the contamination happened in the days immediately after the March 11 earthquake and tsunami, when workers desperately tried to release flammable hydrogen gas that was then building up inside the reactor buildings. The release, known as venting, failed to prevent crippling explosions that destroyed the reactor buildings.

The company said the workers who found the reading were safely protected by antiradiation clothing. Tokyo Electric said it has closed off an area of several yards around where the lethal radiation level was found. The company said this would not hamper efforts to build a new cooling system and remove contaminated water.

The plant has continued to spew radiation since the disaster, though levels have been dropping. The operator is working to install a new makeshift cooling system by early next year that will allow it to finally shut down the plant’s three damaged reactors.

That effort includes removing thousands of tons of highly contaminated water from the reactor buildings. On Monday, Tokyo Electric also said it will begin constructing a new wall that will extend some 60 feet underground to prevent radioactive groundwater from seeping into the nearby Pacific Ocean.

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