Monday, April 18, 2011

#Fukushima I Nuke Plant: 5-Meter Deep Water in Reactor 4 Building, Highly Radioactive Water in Reactor 2 Spent Fuel Pool

All is well at Fukushima I Nuke Plant. Nothing to worry about, TEPCO and NISA are on top of it.

From Yomiuri Shinbun (11:23PM JST 4/28/2011) (I'll go look for the original presser later):

TEPCO announced on April 18 that the radioactive materials were found in high concentration in the Spent Fuel Pool water of the Reactor 2 at Fukushima I Nuclear Power Plant.

TEPCO analyzed the water taken on April 16 from the overflow tank, and found:

  • Cesium-134 at 160,000 becquerels/cubic centimeter;
  • Cesium-137 at 150,000 becquerels/cubic centimeter;
  • Iodine-131 at 4,100 becquerels/cubic centimeter.

TEPCO believes that it is likely the radioactive materials in the water were leaked from the Containment Vessel [Reactor 2's Suppression Pool is damaged], but admits there's a possibility that the spent fuel rods in the Pool are damaged.

In the meantime, Nuclear and Industrial Safety Agency (NISA) announced on April 18 that the Reactor 4 building basement was found to be flooded with 5-meter (16.40 feet) deep water. No information yet on the radioactive materials in that water, but it would be another impediment to the repair work to be done on the Reactor 4. NISA had announced earlier on April 18 that the depth of water found in the Reactor 4 building was only 20 centimeters.


 プールからあふれた水を受けるタンクから16日に採取した水を分析した結果、放射性セシウム134が1立方センチ・ メートルあたり16万ベクレル、セシウム137が同15万ベクレル、ヨウ素131が同4100ベクレル検出された。東電は「圧力が高まった格納容器から漏 れ出た放射性物質が溶け込んだ可能性が高い」と見ているが、プールの燃料棒が破損している可能性も否定できないという。

 一方、経済産業省原子力安全・保安院は18日、4号機原子炉建屋地下1階で汚染水が約5メートルの深さでたまっているのが見つかったと発表した。 濃度は不明だが、4号機の復旧作業には汚染水をまず処理する必要があり、障害がまた増えたことになる。汚染水の水深について、保安院は同日午前中に「約 20センチ」と公表したが、その後訂正した。

(2011年4月18日23時23分 読売新聞)


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