日本機械学会論文集
Online ISSN : 2187-9761
ISSN-L : 2187-9761
熱工学,内燃機関,動力エネルギーシステム
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((2) ULOF再配置/冷却過程における評価)
曽我部 丞司鈴木 徹和田 雄作飛田 吉春
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2017 年 83 巻 848 号 p. 16-00393

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The achievement of In-Vessel Retention (IVR) of the accident consequences in an unprotected loss of flow (ULOF), which is one of the technically inconceivable events postulated beyond design basis, is effective and rational approach in enhancing the safety characteristics of sodium-cooled fast reactor (SFR). In the evaluation of the event progressions during ULOF, the whole sequence is categorized into several phases: initiating, transition, and post-accident-material-relocation/post-accident-heat-removal (PAMR/PAHR) phases. The following two points should be confirmed to achieve IVR: 1) there is no significant mechanical energy release, and 2) the decay heat generated from relocated fuels is stably removed. The assessments of the initiating and transition phases for a small-scale SFR showed that 1) there was no significant mechanical energy release. The objective of the present study is to show that 2) the decay heat generated from the relocated fuels would be stably removed in the PAMR/PAHR phase, where the relocated fuels mean fuel discharged from the core into the low-pressure plenum through control-rod guide tubes, and fuel remnant in the disrupted core region (non-discharged fuel). As a result of the present assessments, it should be concluded that the stable cooling of the relocated fuels was confirmed and the prospect of IVR was obtained.

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