Study on post-blowdown of hot leg large break loss-of-coolant-accident in the view of mass and energy release analysis

摘要

This study conducted mass and energy release experiment for the hot leg large break loss-of-coolant-accident (LBLOCA) during post-blowdown with an integral test facility, Seoul National University Facility (SNUF), and its RELAP5 simulation. This facility simulated the Young Kwang Nuclear Power Plant Units 3 and 4 (YGN3&4) with Volume ratio of 1:1140 based on Ishii's three level scaling. The experiments showed that safety injection (SI) water Refilled the cold leg first and later the core. The SI water was vaporized in the core, which resulted in the repressurization of the reactor.