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Behavior of coated fuel particle of High-Temperature Gas-cooled Reactor under reactivity-initiated accident conditions

反応度事故条件下における高温ガス炉粒子燃料挙動

梅田 幹; 杉山 智之; 永瀬 文久; 更田 豊志; 植田 祥平; 沢 和弘

Umeda, Miki; Sugiyama, Tomoyuki; Nagase, Fumihisa; Fuketa, Toyoshi; Ueta, Shohei; Sawa, Kazuhiro

In order to clarify the failure mechanism and determine the failure limit of the High Temperature Gas-cooled Reactor (HTGR) fuel under reactivity-initiated accident (RIA) conditions, pulse irradiations were performed with unirradiated coated fuel particles at the Nuclear Safety Research Reactor (NSRR). The energy deposition ranged from 580 to 1,870 J/gUO$$_{2}$$ in the pulse irradiations and the estimated peak temperature at the center of the fuel particle ranged from about 1,510 to 3,950 K. Detailed examinations after the pulse irradiations showed that the coated fuel particles failed above about 1,400 J/gUO$$_{2}$$ where the peak fuel temperature reached over the melting point of UO$$_{2}$$ fuel. It was also shown that the coated fuel particle was failed by the mechanical interaction between the melted and swelled fuel kernel and the coating layer under RIA conditions.

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