Development of LOCA licensing calculation capability with RELAP5-3D in accordance with Appendix K of 10 CFR 50.46

Passive depressurization accident management strategy for boiling water reactors

“…Further investigation on the failure condition and leakage area is necessary for the application of these passive depressurization systems. In addition, the loss of coolant accident (LOCA) is one of the most important design basis accidents (Liang et al, 2002). Thus, the risk of LOCA caused by the passive depressurization systems should also be evaluated in the future study.…”

Risk-informed analysis of the large break loss of coolant accident and PCT margin evaluation with the RISMC methodology

“…To generate a load spectrum for the LBLOCA while considering both aleatory and epistemic uncertainties, a two-step approach was adopted as elaborated in section 2. The first step is to generate a preliminary load spectrum by using RELAP5-3D/K (Liang, K.S., et al, 2002a) (Liang, K.S., et al, 2002b) to calculate the nominal conditional PCT (CPCT  ) for each sequence, and the second step is to account for the epistemic or calculation uncertainty of the preliminary load spectrum by using the DRHM methodology (Liang, K.S., 2011). In the DRHM methodology, conservative Appendix K models were adopted to cover model uncertainty, whereas realistic plant status parameters were used with statistical uncertainty analysis.…”