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Stress intensity factor at the tip of cladding incipient crack in RIA-simulating experiments for high burnup PWR fuels

反応度事故模擬実験における高燃焼度燃料被覆管予き裂先端の応力拡大係数

宇田川 豊  ; 鈴木 元衛; 杉山 智之 ; 更田 豊志

Udagawa, Yutaka; Suzuki, Motoe; Sugiyama, Tomoyuki; Fuketa, Toyoshi

RIA-simulating experiments for high burnup PWR fuels have been performed in the NSRR and stress intensity factor $$K$$$$_{rm I}$$ I at the tip of cladding incipient crack has been evaluated in order to investigate its validity as a PCMI failure threshold in RIA conditions. An incipient crack depth was determined by observation of the metallographs. Hoop stress in cladding periphery during the pulse power transient was calculated by the RANNS code. Failure in elastic deformation range has never occurred with $$K$$$$_{rm I}$$ of less than 17 MPa m$$^{1/2}$$.

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パーセンタイル:38.58

分野:Nuclear Science & Technology

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