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Report No.
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Corrosion tests of vessel steels in diluted seawater under $$gamma$$ rays irradiation, 3; Effects on depth of localized corrosion

Nakano, Junichi; Tsukada, Takashi ; Ueno, Fumiyoshi  ; Yamagata, Ryohei

In the Fukushima Daiichi Nuclear Power Station, it is considered that corrosion of primary containment vessel (PCV) and reactor pressure vessel (RPV) steels is accelerated by seawater injection and high radiation dose. In general, it is known that weight loss in steels increases near gas-liquid interface. Therefore, the lower half of the specimens was dipped in diluted seawater at 50$$^{circ}$$C under $$gamma$$ rays irradiation. Gas phase in flasks was air or N$$_{2}$$ atmosphere. After the tests, oxide layer was removed and 3 dimension (3D) digital data were measured on the specimen surface using a 3D macro-scope. In air atmosphere, the maximum roughness height increased with time and dose rate. After $$gamma$$ rays irradiation for 500 h, the maximum roughness height in N$$_{2}$$ atmosphere was lower than that in air atmosphere. Since O$$_{2}$$ concentration in liquid was reduced by decrease of O$$_{2}$$ partial pressure in gas phase, it was appeared that localized corrosion was suppressed.

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