Late detection of faults affecting a diesel engine standby generator set in reactor 1. On February 17, 2021, EDF notified ASN of a significant safety event relating to the late detection of faults affecting an emergency diesel engine generator set in reactor 1 of the Flamanville nuclear power plant. Each reactor operated by EDF is equipped with two power supply lines from the national electricity network, and two diesel engine backup generators. Since July 2020, the two reactors in operation at the Flamanville power plant also have a third so-called “ultimate help” (DUS) diesel generator. Finally, each site with 1300 MWe reactors has a combustion turbine which can compensate for the total loss of external and internal electrical power supplies, and makes it possible to replace an unavailable diesel generator. Depending on the state of the reactor, the number of electrical sources required is defined by the general operating rules (RGE).
ASN 11th March 2021 read more »