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Corrosion behavior and mechanical property of spent fuel cladding tube immersed in warm artificial seawater

温人工海水に浸漬した使用済燃料被覆管の耐食性と機械的強度特性

本岡 隆文; 鈴木 和博; 鈴木 美穂; 豊川 琢也 ; 木村 康彦

Motooka, Takafumi; Suzuki, Kazuhiro; Suzuki, Miho; Toyokawa, Takuya; Kimura, Yasuhiko

福島事故時に1F4燃料プールに保管されていた燃料について、海水注入による使用済燃料被覆管への腐食影響を調査する目的で、事故当初の燃料プール環境を模擬した80$$^{circ}$$Cの人工海水に300時間浸漬した使用済被覆管に対して、外観検査・金相試験・機械的強度試験を実施した。外観検査および金相試験で、海水浸漬による腐食影響は認められなかった。また、引張強度は、未浸漬のものと同等であった。

Spent fuels were stored in the spent fuel pool (SFP) at the Fukushima Daiichi Nuclear Power Plant. Seawater was injected into SFP to cool spent fuels for emergency measure in the Fukushima Daiichi Nuclear Accident. Seawater can cause local corrosion. The purpose of this study is to investigate the effect of seawater on corrosion behavior and mechanical property of the spent fuel cladding. We immersed short spent fuel cladding tubes ($$sim$$50 GWd/t) in artificial seawater at 353 K for 300 h and conducted visual, metallographic and strength examinations of the tubes after immersion. Visual and metallographic examination indicated that warm seawater little affected the corrosion behavior of the spent fuel cladding. Black oxides formed on the surface of the cladding during the reactor operation were observed. No local corrosion and crack were observed. Ultimate tensile strength (UTS) and 0.2% yield strength (0.2%YS) of tubes with and without immersion in artificial seawater at 353 K for 300 h were measured. The strength of immersed tube was comparable to that of non-immersed tube. The results suggest that the seawater injection little affects on corrosion behavior and mechanical property of the spent fuel cladding.

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