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Report No.
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Corrosion tests under $$gamma$$ rays irradiation to examine measures for corrosion inhibition of reactor vessel steels

Nakano, Junichi; Yamamoto, Masahiro ; Tsukada, Takashi ; Yamagata, Ryohei

In the Fukushima Daiichi Nuclear Power Station, seawater was injected into the reactor cores as an emergency measure for the core cooling. Radiation dose is high in the primary containment vessels (PCVs) because of the fuel debris and the fission products. It is considered that corrosion of the PCVs and the reactor pressure vessels is accelerated by the products of water radiolysis. Corrosion tests were conducted in diluted seawater at under $$gamma$$-rays irradiation. Weight loss in the diluted seawater irradiated with dose rates $$leq$$ 0.2 kGy/h was comparable with that without irradiation. Weight loss in the diluted seawater irradiated with dose rates $$geq$$ 0.6 kGy/h was higher than that without irradiation. Under irradiation, weight loss in N$$_{2}$$ atmosphere was lower than that in air atmosphere. To reduce weight loss, hydrazine (N$$_{2}$$H$$_{4}$$) addition in air atmosphere was not effective while N$$_{2}$$H$$_{4}$$ addition in N$$_{2}$$ atmosphere was effective.

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