Evaluation of post-quench ductility of oxidized high burnup fuel cladding by ring compression test

Nagase, Fumihisa ; Chuto, Toshinori; Suzuki, Kazuhiro; Fuketa, Toyoshi

Ductility of high burnup fuel cladding which experienced rupture, high-temperature oxidation and quenching in the LOCA-simulated integral test was evaluated by the ring compression test. Although ductility was remarkably reduced in the cladding which absorbed hydrogen of above about 500 ppm and was oxidized above 1270 K, effects of the high burnup are small except for hydrogen absorption. It is considered that the ring compression test provides more conservative criteria than the integral test regarding the integrity of the cladding in LOCAs.