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Influence of Zn injection on PWSCC crack growth rates of alloy 600 under simulated primary coolant environments of pressurized water reactor

加圧水型軽水炉一次系冷却水模擬環境下における600合金のPWSCC亀裂進展速度に及ぼす亜鉛注入の影響

知見 康弘; 佐藤 賢二*; 笠原 茂樹; 梅原 隆司*; 端 邦樹 ; 塙 悟史 ; 西山 裕孝 

Chimi, Yasuhiro; Sato, Kenji*; Kasahara, Shigeki; Umehara, Ryuji*; Hata, Kuniki; Hanawa, Satoshi; Nishiyama, Yutaka

一次系冷却水中での応力腐食割れ(PWSCC)進展挙動への亜鉛注入の影響を調べるため、加圧水型軽水炉(PWR)一次系水模擬環境での10%冷間加工600合金の亀裂進展試験を、320$$^{circ}$$C及び360$$^{circ}$$C、亜鉛注入の有無、溶存水素濃度(DH)5, 30、及び50cc/kgH$$_{2}$$Oの条件下で実施した。360$$^{circ}$$Cでの亀裂進展試験の結果、亜鉛注入が亀裂内の酸化と亀裂進展速度を抑制することが示唆された。また亜鉛注入した320$$^{circ}$$Cでの亀裂進展試験では、亀裂進展速度のDH依存性が亜鉛注入なしの試験データに基づく亀裂進展速度の予測値と同様の傾向を示し、320$$^{circ}$$Cでの亀裂進展速度のDH依存性に対する明確な亜鉛注入の影響は見られなかった。

To investigate the influence of Zinc (Zn) injection on primary water stress corrosion cracking (PWSCC) growth behavior, crack growth tests of 10% cold-worked Alloy 600 in simulated primary water environment of pressurized water reactor (PWR) at 320$$^{circ}$$C and 360$$^{circ}$$C, with and without Zn injection, under dissolved hydrogen (DH) conditions of 5, 30, and 50 cc/kgH$$_{2}$$O. As a result of the crack growth tests at 360$$^{circ}$$C, it is implied that Zn injection suppresses the oxidation inside the crack and the crack growth rate (CGR). From the crack growth tests at 320$$^{circ}$$C with Zn injection, DH-dependence of CGR showed a similar tendency to the predicted CGR based on the CGR data without Zn injection. Obvious influence of Zn injection on DH-dependence of CGR at 320$$^{circ}$$C was not observed in the present study.

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