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FEMAXI-7 prediction of the behavior of BWR-type accident tolerant fuel rod with FeCrAl-ODS steel cladding in normal condition

FEMAXI-7を用いた通常運転時におけるBWR用事故耐性FeCrAl-ODS燃料のふるまい予測

山路 哲史*; 山崎 大輝*; 岡田 知也*; 坂本 寛*; 山下 真一郎

Yamaji, Akifumi*; Yamasaki, Daiki*; Okada, Tomoya*; Sakamoto, Kan*; Yamashita, Shinichiro

現行のBWR9$$times$$9型燃料においてジルカロイ被覆管をFeCrAl-ODS鋼被覆管(経済産業省の研究開発プロジェクトで開発中の一種の酸化物分散強化型鋼)に置き換えた時の事故耐性燃料性能の特徴について、燃料ふるまい解析コードFEMAXI-7を用いて評価した。特に、燃料温度、核分裂ガス放出、ペレット-被覆管機械的相互作用(PCMI)に及ぼす、クリープひずみ速度やODS被覆管の肉厚の影響について調査した。

Features of the accident tolerant fuel performance were evaluated with FEMAXI-7 when the current Zircaloy(Zry) cladding is replaced with FeCrAl-ODS steel cladding (a type of oxide dispersion strengthened steel being developed under the Project on Development of Technical Basis for Safety Improvement at Nuclear Power Plants by Ministry of Economy, Trade and Industry (METI) of Japan) for BWR 9$$times$$9 type fuel rod. In particular, influences of the creep strain rate and thickness of the ODS cladding on the fuel temperature, fission gas release rate (FGR) and pellet-cladding mechanical interaction (PCMI) are investigated.

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