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Four point bend test results of ballooned cladding tubes

膨れ被覆管における4点曲げ試験の報告

湯村 尚典

Yumura, Takanori

Fuel safety during long-term cooling following a LOCA sequence has been a key issue since the accident at the Fukushima Daiichi Nuclear Power Plant. In order to investigate effects of ballooning and rupture on the fracture resistance of cladding tube, the relationship between the fracture resistance and the cladding deformation due to ballooning and rupture is investigated by performing four-point-bend test on non-irradiated Zircaloy-4 cladding tube specimen. As a result, the maximum bending moment at fracture decreased with increasing the maximum circumferential strain. However, the correlation between the maximum bending moment and the size of rupture opening was not clear. The oxidation and stress concentration in the region around rupture opening seemed to be more effective on the fracture position than those of the secondary hydriding within the examined conditions.

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