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Report No.
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Study of hydrogen mitigation for safe storage of spent cesium adsorption vessels

Kamiji, Yu; Terada, Atsuhiko ; Okagaki, Yuria  ; Hino, Ryutaro

Hydrogen mitigation is one of the important issues for safe storage of spent cesium adsorption vessels at the Fukushima Daiichi NPS because the production and accumulation of hydrogen is induced by the radiolysis of residual water in the vessel. In the present study, an experimental examination was performed using a miniature acrylic vessel to simulate an upper section of the vessel using particle image velocimetry to clarify the internal flow and to verify the analytical results by the FLUENT code. As the result, weak upflow and circulating flow at the stepped section were successfully visualized, and the validity of the analytical results was confirmed by the flow patterns. Additionally, catalytic reaction test was conducted to evaluate its effectiveness. The results showed that the catalyst retains activity under the humid condition assumed in the real vessel.

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Category:Nuclear Science & Technology

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