A CIPS risk evaluation methodology applicable for PWR by MENG Shuqi, HU Yisong, LI Changying, RUAN Tianming, LIAO Jiapeng

“…At a certain level of CRUD, boron acid will precipitate and depress local nuclear power, causing CRUD induced power shift (CIPS) incident, however, the operation data of reactors that have undergone CIPS indicate that CRUD thickness is not the only factor affecting CIPS.PurposeThis study aims to evaluate the CIPS risk of PWR more scientifically by establishing an evaluation methodology that comprehensively considers CRUD characteristics and thermal-hydraulic condition.MethodsBased on the internal mass transfer mechanism of the porous media, a model which could simulate boron deposition process inside CRUD was established by combining the consideration of CRUD morphology. …”
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