Large Break LOCA Uncertainty Quantification for Boiling Natural Circulation Reactor Using Latin Hypercube Sampling

摘要

This work deals with uncertainty in Peak Clad Temperature (PCT) for double-ended rupture in the primary coolant circuit of Indian natural circulation reactor. This rupture is identified as a critical break size leading to maximum clad temperature from best estimate code RELAP5. Based on initial sensitivity studies, six important parameters are selected for their significant impact on PCT. Latin Hypercube Sampling (LHS) is used to create 500 sets of six independent variables based on their probability distribution and LOCA calculations have been performed. The 95th percentile value of PCT is 1287 K and it is significantly below the core coolability criteria of 1477 K.