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Report No.

Possibility of production and condensation of hydrogen from boiling water under irradiation in the Fukushima Daiichi F4 fuel storage pool

Yamashita, Shinichi; Hirade, Tetsuya ; Matsuura, Chihiro*; Iwamatsu, Kazuhiro; Taguchi, Mitsumasa; Katsumura, Yosuke*

Fukushima Daiichi Nuclear Power Plant Unit-4 was under an inspection on the day of Tohoku earthquake, and all of the fuels were cooled in the fuel storage pool. However, the explosion occurred only four days after the cooling of the pool stopped. Later, the pool was investigated and it was clarified that the fuels were not so damaged and the water was not contaminated with radioisotopes. There are several explanations of the cause of the explosion. We picked up one possibility that the radiolysis of the water was the source of the hydrogen and that the vapor condensation could make the high hydrogen density behind the cold roof or walls, and investigated by an experiment of boiled water radiolysis by $$gamma$$-rays. The results can explain some of the typical things happened on the explosion of Unit-4.



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