The examination of the vulnerability of NPP-Cernavoda to a severe accident due to the loss of the entire electrical power supply

In this paper it is presented the framework for the PSA Level 2 analysis, where it is selected one of the worst severe accident sequence, such as that initiated from the loss of all electrical power sources SBO (Station Blackout). To examine the vulnerability of NPP-Cernavoda to this severe accident sequence, a complete quantitative analysis is done by using the specialized severe accident code MAAP-WS for NPP CANDU-600. The main result of this analysis is that even if the containment fails, the release of fission products to environment is very low, except the noble gases. An accident recovery can be obtained if we consider the dousing system available initially. Also the course of the accident can be changed if we follow-up the sequences' pathway given in the event trees for containment. (author) 10 figs., 1 tab., 5 refs