PSA-oriented thermal-hydraulic analyses for LOCA accidents in WWER-440 V213 NPP

摘要

The study is concentrated on PSA-oriented thermal-hydraulic analysis of WWER-440/V213 NPP. Analyses are limited to LOCA initiating events. The main objective of the study is to provide quantitative evidence for PSA accident sequence modeling. The study is devoted to identification minimal safety system requirements and grouping LOCA initiators with the same safety system success criteria. The study included several tasks: (1) categorization of LOCA according to minimal safety system requirements based on existing results; (2) selection of accident scenarios for computer analysis to verify qualitative assessment; (3) performing computer analyses with RELAP5/MOD2 for the selected scenarios; (4) reassessment of LOCA categorization and verification of minimal safety requirements. (author). 9 refs, 218 figs, 31 tabs. (Atomindex citation 27:015037)