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Oral presentation

Water radiolysis at Fukushima Daiichi Nuclear Plant and corrosion of material for nuclear power plant

Motooka, Takafumi

no journal, ,

At the Fukushima Daiichi Nuclear Power Plant, seawater and fresh water were injected to cool down the reactor cores and in spent fuel pools after the accident in March 2011. Therefore, metallic materials for reactor and fuel pool will be exposed to corrosion environment. At JAEA, research on the integrity of materials for nuclear power plant have been carried out since March 2011. Outline and results of the research regarding to reactor and fuel pool will be present.

Oral presentation

Radiation-induced reactions of molecules adsorbed on zeolites in aqueous solution

Kumagai, Yuta; Kimura, Atsushi; Taguchi, Mitsumasa

no journal, ,

Zeolite minerals are used for adsorption of radioactive cesium from water. After the water treatment, intense ionizing radiations would induce water radiolysis in the zeolite pores to produce hydrogen (H $_{2}$ ) and hydrogen peroxide (H $_{2}$ O $_{2}$ ). Hence the radiation effects on zeolite-water mixtures were studied. Production of H $_{2}$ from a mixture of natural mordenite and seawater was measured. The measurement suggests that H $_{2}$ was produced due to the irradiation of mordenite additionally to H $_{2}$ from the direct water radiolysis. Then, the effect of oxygen (O $_{2}$ ) on H $_{2}$ production from a mixture of X-type zeolite and water was investigated. Decrease in H $_{2}$ production was observed in the presence of O $_{2}$ . The decrease indicates an effect of O $_{2}$ to inhibit the additional H $_{2}$ from the zeolite. Moreover, radiation-induced reactions of H $_{2}$ O $_{2}$ in a mixture with Y-type zeolite were studied. H $_{2}$ O $_{2}$ was effectively decomposed by irradiation. The decomposition can be explained by a radiation-induced reaction of H $_{2}$ O $_{2}$ adsorbed on the zeolite. The results show that the radiation-induced reactions of molecules adsorbed on zeolites have a key role in the radiation effects on the zeolite-water mixtures.

Oral presentation

An Investigation on the early process of water radiolysis in highly concentrated sodium chloride solutions

Hata, Kuniki; Yamashita, Shinichi*; Muroya, Yusa*; Katsumura, Yosuke*; Hanawa, Satoshi; Kasahara, Shigeki; Ueno, Fumiyoshi

no journal, ,

no abstracts in English

Oral presentation

Effect of -ray radiation on the material corrosion of waste storage containers for the water treatment systems in Fukushima Daiichi Nuclear Power Stations

Kato, Chiaki; Sato, Tomonori; Ueno, Fumiyoshi; Yamagishi, Isao

no journal, ,

no abstracts in English

Oral presentation

Engineering perspectives on effects of salt contents and solid materials on water radiolysis

Nagaishi, Ryuji

no journal, ,

no abstracts in English