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Effects of hydrazine addition and N$$_{2}$$ atmosphere on the corrosion of reactor vessel steels in diluted seawater under $$gamma$$-rays irradiation

$$gamma$$線照射下での希釈海水中における原子炉容器鋼の腐食に及ぼすヒドラジン添加およびN$$_{2}$$雰囲気の影響

中野 純一; 加治 芳行; 山本 正弘; 塚田 隆

Nakano, Junichi; Kaji, Yoshiyuki; 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。原子炉容器鋼の腐食が進行することが懸念されている。原子炉容器鋼耐久性を評価するために、50$$^{circ}$$Cでの希釈海水中で腐食試験を$$gamma$$線照射下で行った。10mg/Lおよび100mg/L 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。フラスコの気相をN$$_{2}$$で置換した場合、鋼材の重量減少、および希釈海水中のO$$_{2}$$およびH$$_{2}$$O$$_{2}$$濃度は減少した。

Seawater was injected into the reactor cores in the Fukushima Daiichi Nuclear Power Station. Corrosion of reactor vessel steels is considered to progress. To evaluate durability of the reactor vessel steels, corrosion tests were conducted in diluted seawater at 50 $$^{circ}$$C under $$gamma$$-rays irradiation. 10 mg/L and 100 mg/L N$$_{2}$$H$$_{4}$$ were added to diluted seawater. Without addition of N$$_{2}$$H$$_{4}$$, weight loss in the vessel steels irradiated with the 0.2 kGy/h dose rate was comparable with those without irradiation and weight loss in the vessel steels irradiated with the 4.4 kGy/h dose rate was higher than those without irradiation. Under irradiation, weight loss in the vessel steels in diluted seawater containing N$$_{2}$$H$$_{4}$$ was comparable with that in diluted seawater without N$$_{2}$$H$$_{4}$$. When gas phase in the flask was replaced with N$$_{2}$$, weight loss in the vessel steels, and O$$_{2}$$ and H$$_{2}$$O$$_{2}$$ concentrations in the diluted seawater decreased.

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パーセンタイル:61.51

分野:Nuclear Science & Technology

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