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$$gamma$$線照射下におけるヒドラジン添加希釈海水中での炭素鋼および低合金鋼の腐食

Corrosion of carbon steel and low-alloy steel in diluted seawater containing hydrazine under $$gamma$$-rays irradiation

中野 純一; 山本 正弘; 塚田 隆

Nakano, Junichi; Yamamoto, Masahiro; Tsukada, Takashi

東京電力福島第一原子力発電所(1F)の1, 2および3号機では、海水が炉心に注入された。炭素鋼と低合金鋼の腐食に及ぼす$$gamma$$線照射の影響を調べるために、50$$^{circ}$$Cでの希釈海水中で腐食試験を4.4kGy/hと0.2kGy/hの線量率の$$gamma$$線照射下で行った。加えて、ヒドラジン(N$$_{2}$$H$$_{4}$$)を希釈海水中に添加した。N$$_{2}$$H$$_{4}$$無添加の希釈海水中において、0.2kGy/hで照射された鋼材の重量減少は非照射のそれと同等であり、4.4kGy/hで照射された鋼材の重量減少は非照射鋼材のそれの約1.7倍まで増加した。N$$_{2}$$H$$_{4}$$を含む希釈海水中で照射された鋼材の重量減少はN$$_{2}$$H$$_{4}$$無添加の希釈海水中でのそれと同等であった。$$gamma$$線照射試験中、N$$_{2}$$をフラスコの気相に導入した場合、鋼材の重量減少は減少した。

The seawater was injected into reactor cores of Units 1, 2 and 3 in the Fukushima Daiichi Nuclear Power Plant. To investigate effects of $$gamma$$ rays irradiation on corrosion of carbon steel and low alloy steel, corrosion tests were performed in the diluted seawater at 50 $$^{circ}$$C under $$gamma$$ rays irradiation with dose rates of 4.4 kGy/h and 0.2 kGy/h. Hydrazine (N$$_{2}$$H$$_{4}$$) was added to the diluted seawater. In the diluted seawater without N$$_{2}$$H$$_{4}$$, the weight losses of the steels irradiated with 0.2 kGy/h were similar to those of the unirradiated steels, and the weight losses of the steels irradiated with 4.4 kGy/h increased to approximate 1.7 times of those of the unirradiated steels. The weight losses of the steels irradiated in the diluted seawater containing N$$_{2}$$H$$_{4}$$ were similar to those in the diluted seawater without N$$_{2}$$H$$_{4}$$. When N$$_{2}$$ was introduced to gas phase in the flasks during $$gamma$$ rays irradiation, the weight losses of the steels decreased.

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