Investigation on primary side oriented accident management measures in a station blackout scenario for a VVER-1000 reactor


Investigation on primary side oriented accident management measures in a station blackout scenario for a VVER-1000 reactor

Tusheva, P.; Schaefer, F.; Reinke, N.; Altstadt, E.; Rohde, U.; Weiss, F.-P.; Hurtado, A.

A consequence of a total loss of AC power supply (station blackout) leading to unavailability of major active safety systems is that the safety criteria ensuring a secure operation of the nuclear power plant would be violated and a consequent core heat-up with possible core degradation would occur. In such an accident a special accident management measure (primary side depressurization) can be applied to reduce the primary pressure and to activate the injection from the passive emergency core cooling systems (accumulators). The analyses presented in this paper are aiming at a detailed investigation of the accident sequence and the possibilities to prevent or to mitigate a damage of the reactor core. A main objective of the investigation is to evaluate the effectiveness of the applied accident management measure. The analyses are performed using the codes ASTEC and ATHLET developed by IRSN (Institut de Radioprotection et de Sûreté Nucléaire) and GRS (Gesellschaft für Anlagen- und Reaktorsicherheit mbH).

Keywords: severe accidents; accident management measures; station blackout; VVER-1000 reactors

Permalink: https://www.hzdr.de/publications/Publ-13375
Publ.-Id: 13375