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第4世代SFRを対象としたSAS4AコードによるATWS事象の起因過程解析

Analysis on the initiating phase of ATWS events for Gen-IV loop-type SFR with SAS4A

久保田 龍三朗; 鈴木 徹; 川田 賢一   ; 久保 重信 ; 山野 秀将   ; 小山 和也*; 森脇 裕之*; 山田 由美*; 島川 佳郎*

Kubota, Ryuzaburo; Suzuki, Toru; Kawada, Kenichi; Kubo, Shigenobu; Yamano, Hidemasa; Koyama, Kazuya*; Moriwaki, Hiroyuki*; Yamada, Yumi*; Shimakawa, Yoshio*

様々な炉心状態について、炉心設計と整合性の高い出力及び反応度データを作成する手法を新たに整備した。この新手法を用いて、実証施設規模の第4世代SFRを対象に、SAS4Aコードによる、定格出力及び部分出力からのULOF及びUTOPの起因過程解析を実施し、即発臨界が回避される見通しを得た。

A new methodology to obtain SAS4A input data of power and reactivity profile more consistent with the core design for various core states was consolidated. Using this methodology, SAS4A analyses on the initiating phase during ULOF and UTOP transients from the full power state and the low power state were performed. This analysis study suggests that the power excursion with prompt criticality leading to large mechanical energy release can be prevented in the initiating phase of the current design for the medium-scale Gen-IV loop-type SFR.

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