Uncertainty and Sensitivity Analysis of Hydrogen Source Term under Severe Accident of Marine Reactor

In order to explore the hydrogen source term characteristics under severe accidents of marine pressurized water reactors (PWR) and effectively assess risk, best estimation program SCDAP/RELAP5/MOD3.2 is used establish reactor accident analysis model. Based on Latin Hypercube sampling (LHS) method Wilks theory, a set methods for uncertainty developed. This can be applied sensitivity different target parameters. The phenomenon identification ranking table (PIRT) induced by break are established, 14 uncertain parameters selected as input variables. established PIRT fills gap in provides reference subsequent research. quantitative calculation results carried out, range production defined. Spearman correlation coefficient evaluate parameters, each parameter obtained. show that caused medium equivalent diameter break, zirconium–water reaction pressure vessel 20.14 kg~22.19 kg with 95% confidence, fuel cladding thickness has significant positive production.