An experimental study on vapor explosion under a reactivity initiated accident condition.

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  • 反応度事故時の蒸気爆発に関する実験的研究

Abstract

Vapor explosion caused by the failure of light water nuclear reactor fuels under a reactivity initiated accident condition is studied through in-pile experiments in the Nuclear Safety Research Reactor (NSRR). Previously pressurized fuel rods containing uranium dioxide pellets are subjected to a pulse irradiation in the NSRR and heated by nuclear fission very rapidly. Pressure pulses and water hammer forces generated at failure are measured during the irradiation. It is shown that the generation of destructive forces is strongly affected by fuel fragmentation, but is not very sensitive to the initial fuel rod pressure.

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