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((1) ATWSにおけるIVR評価の概要)
鈴木 徹曽我部 丞司飛田 吉春堺 公明中井 良大
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ジャーナル フリー

2017 年 83 巻 848 号 p. 16-00395

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The achievement of In-Vessel Retention (IVR) against Anticipated Transient without Scram (ATWS) is an effective and rational approach in enhancing the safety characteristics of sodium-cooled fast reactors. Based on the Probabilistic Risk Assessment (Level 1 PRA) for a prototype fast-breeder reactor, Unprotected Loss of Flow (ULOF), which is one of the technically inconceivable events postulated beyond design basis, can be selected as a representative event of ATWS. The objective of the present study is to show that no significant mechanical energy would be released during core disruption caused by ULOF, and that thermal failure of the reactor vessel could be avoided by the stable cooling of disrupted-core materials. As a result of the present evaluation with computational codes and physical models reflecting the knowledge on relevant experimental studies, the prospect of IVR against ULOF was obtained.

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