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福島第一原子力発電所の廃止措置を安全に進めるうえで考慮すべきラジオリシスの影響

Radiolysis effects, which should be taken into account for safe decommissioning of Fukushima-Daiichi Nuclear Power Station

端 邦樹 

Hata, Kuniki

東京電力福島第一原子力発電所の汚染水中の腐食環境の評価においては、建屋内が放射線環境下にあるため、水の放射線分解(ラジオリシス)により生成する過酸化水素(H$$_{2}$$O$$_{2}$$)等の酸化剤の影響を考慮する必要がある。ラジオリシス過程及びそれにより発生する酸化剤の生成量は水質や放射線の線質などに依って変化する。そのため、この10年間、水の放射線分解に寄与しうる様々な要因(海水成分、酸化物の表面の作用、$$alpha$$核種等)を対象に研究が進められてきた。本稿では、汚染水中の腐食環境のより深い理解に繋げるため、これらの要因のラジオリシス影響について解説する。

In order to estimate corrosive environment in the contaminated water at Fukushima Daiichi Nuclear Power Station, effects of oxidants, such as H$$_{2}$$O$$_{2}$$, which were generated from water radiolysis, should be taken into account due to the irradiation field in the reactor building. The process of water radiolysis and the amounts of these oxidants can change depending on the conditions of water and types of radiation. After the accident, a variety of factors, which can affect water radiolysis, such as seawater constituents, surface of oxides, and $$alpha$$-radionuclides, had been discussed. In this paper, these effects on radiolysis are reviewed for the better understanding of the corrosive environment in the contaminated water.

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