Study on the Progression of Severe Core Damage Induced by SGTR and Mitigation Measures for QINSHAN NPP Unit 1

The progression of core damage induced by SGTR in Qinshan NPP Unit 1 is analyzed by a NPP severe accident simulator developed in this laboratory, based on SCDAP/RELAP5/ MOD3.1 and PROSYS. By employing the results of USA SAN ONOFRE NPP’s IPE and SURRY’s PSA, to end the core damage progression and mitigate the consequences of SGTR, the measures for the management of the severe accident induced by SGTR are selected, such as feed-and-bleed and depressurization, which are verified through the calculation by using the simulator. The results suggest that the implementing of feed-and-bleed and depressurization could be an available and effective way to arrest the SGTR sequences in Qinshan NPP unit 1.