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高速炉の炉停止失敗事象における炉容器内終息(IVR)に関する検討,4; ULOF遷移過程における評価

Study on In-Vessel Retention (IVR) of unprotected accident for fast reactor, 4; Assessment of transition phase in ULOF

飛田 吉春; 鈴木 徹; 田上 浩孝

Tobita, Yoshiharu; Suzuki, Toru; Tagami, Hirotaka

高速炉の代表的な炉停止失敗事象である流量喪失時炉停止失敗事象(ULOF: Unprotected Loss of Flow)の遷 移過程における事象推移を評価・検討した。事象推移を支配する現象に関して試験的知見を反映した標準 的な条件では、炉心からの燃料流出によって反応度が低下し、即発臨界を超過することなく事象終息に至る。また、支配現象の不確かさを考慮すると即発臨界に至るが、有意な機械的エネルギは発生しない。

The event progression in the transition phase of ULOF (Unprotected Loss of Flow), which is the representative event in ATWS (Anticipated Transient without Scram) of fast breeding reactor. The existing experimental knowledges on the important phenomena, which dominates the event progression, were adopted in the nominal case. The reactivity lowered with accordance to the fuel discharge through control rod guide tube and the event terminated without prompt criticality. If the uncertainty was considered in the analysis, the reactivity slightly exceeded the prompt criticality, but no mechanical energy was produced.

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