NE Japan Earthquake Day 105: American Water Treatment System Only 1/20 as Effective as Expected on First Day of Trial at Fukushima

American Water Treatment System Only 1/20 as Effective as Expected on First Day of Trial at Fukushima
米社装置の汚染水処理、目標のわずか20分の1
June 23, 2011

On the 22nd, Tokyo Power announced that the sewage treatment system currently undergoing a trial run at Fukushima I Nuclear Reactor, which was set up by the American company Kurion, only decreased contamination by 1/20 of the necessary amount. Because the water was not successfully treated, it still cannot be reused for cooling, and there are worries the container will eventually flood. Tokyo Power said it is planning to expand the dirty water container by 1500 tons, but because of recent high levels of precipitation, that tank could fill even sooner than the current estimate of 11 days from now.

According to Tokyo Power, Kurion’s equipment was able to decrease the contamination of lightly radiated water to less than 1/1000 of its original level, as expected, but it only decreased the radiation of the highly contaminated water which has been mixed with salt water to 1/50 its previous level.

Kurion’s sewage treatment equipment has been combined with the French company Areva’s desalination system. The water can only be reused if it is desalinated, but after desalination its radiation must be reduced to less than 1/10,000 of its original level. Areva’s equipment is said to decrease radiation by 1/400 itself. It’s not known whether the two companies’ systems together are enough to dispose of the problem.

Fukushima Trial Water Treatment System

Expectations and Results for Water Treatment System
1. Remove Oil
2. Absorb Cesium (Kurion): Expected to Decrease Contamination to 1/1000 of Previous Level, Actually Decreased to 1/50
3. Remove Cesium and Sedimentation (Areva): Expected to Decrease Contamination to 1/1000 of Previous Level, Now Forecast to Decrease it to 1/400
4. Contaminated Water Becomes Fresh Water

Original/原稿:
米社装置の汚染水処理、目標のわずか20分の1

東京電力は22日、試運転中の福島第一原子力発電所の汚染水処理システムで、米キュリオン社製の装置の処理能力が、当初目標の20分の1程度にとどまっていると発表した。処理が追いつかず、循環冷却に使う汚染水の再利用ができなくなり、水があふれ出す恐れがある。東電は、汚染水をためている施設の許容量を1500トン増やす方針だが、今後の降雨量によっては、11日間程度と見られる満杯までの余裕が、さらに短くなる可能性もある。

東電によると、キュリオン社の装置は、真水の低濃度汚染水を処理すると、目標の約1000分の1以下まで濃度を下げることができたが、海水混じりの高濃度汚染水だと50分の1程度に下げるのがやっとだった。

汚染水処理システムは、キュリオン社の装置、仏アレバ社の装置に塩分除去装置を組み合わせて、放射性物質と塩分を除く。汚染水の再利用には塩分除去が不可欠だが、除去装置が正常に稼働するには、放射性物質の濃度を1万分の1以下にする必要がある。アレバ社の装置の能力も400分の1程度と言われ、2社の装置を合わせても安定的に処理できるかどうかは不明。
(2011年6月23日00時22分 読売新聞)

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