ASTEC SIMULATION OF A SBO WITH RE-FLOOD IN A GERMAN KONVOI NPP

摘要

This work describes the ASTEC simulation of a station black-out (SBO) scenario in a German 1300 MW_(el) KONVOI NPP with subsequent re-flood of a partly degraded core performed in the frame of the European research project CESAM in the 7th framework program. During the assumed SBO sequence no electrical supply is available on the main voltage levels including the failure of all electrical emergency systems. The simulation results of ASTEC show the capability of the system code to depict the occurring phenomena and the accident scenario reasonably. Uncertainties can be seen in the simulation of degradation phenomena, especially depicting the re-flooding phase, whereas the general behavior of the calculated NPP is kept. Furthermore, the severe accident management (SAM) measure, the restore of electricity and high pressure injection (HPI), is capable to transfer the system into stable conditions after the desired accident.