Study on Level 2 PSA Source Terms Analysis of 1000 MW PWR

In order to resolve the key problem in the severe accident source term calculation technique, the release category of 1000 MWe PWRs and the release fraction of typical accident sequence are calculated by integral code. How to choose the typical scenario is a key problem. The sensitivity analysis and comparison result show that the typical scenario should come from the probability analysis rather than the experience judgement. Other key techniques which have influence on the PSA result have been studied. In order to get reasonable results, the model of the release pass and the water purify effect must be simulated in detail.