Total loss of AC power analysis for EPR reactor

• Total loss of AC power (Station Blackout) was simulated for the EPR reactor model.
• In-vessel phase of the accident is under consideration.
• Comparison of MELCOR and MAAP results is presented.
• MELCOR and MAAP results are comparable.

In this paper the results of severe accident simulations for the EPR reactor in the case of loss of offsite power combined with total failure of all diesel generators (total loss of AC power) are presented. Calculations were performed with MELCOR 2.1 computer code for in-vessel phase of the accident. In this scenario, the unavailability of all offsite and onsite power sources and the lack of cooling leads directly to core degradation, material relocation to the lower plenum and rupture of the reactor pressure vessel. MELCOR results were compared qualitatively and quantitatively with MAAP4 code results and show a good agreement.