Les cahiers de l'ASN #03 - 10 years after Fukushima

7 5 6 4 4 Improving site protection against flooding The aim is to prevent water entering the buildings of the nuclear platform in the event of extreme flooding. This for example consists in installing protections in front of the exterior access doors, reinforced concrete walls, and in filling in the openings situated in the lower part of the buildings. Since 2017, this work has been carried out on all the sites that so require. 6 Emergency management rooms These rooms are where the local crisis teams manage the situation in the event of an accident. After the flooding of the Blayais NPP in December 1999, work was done to ensure that the emergency management rooms were able to withstand high flood levels. Following the Fukushima accident, these rooms have now been reinforced so that they can withstand a “safe shutdown earthquake” (with an intensity greater than the maximum historically probable earthquake). In addition, mobile crisis management resources available on the sites are stored in premises able to withstand flooding and earthquakes. 7 Nuclear rapid intervention force The FARN* comprises specialised crews and equipment (transport resources, compressors, pumps, electricity generating sets, etc.) who can intervene on a damaged site and implement resources within 24 hours. In concrete terms, the FARN can «plug into» an NPP and provide it with water, electricity or compressed air. 5 Ultimate backup generating set If all the existing back-up electricity resources are lost, the diesel ultimate backup generating set can restore electrical supply to the equipment needed to ensure the safety of the reactor and the spent fuel pool. It also supplies the ultimate water source pumps. The building housing this equipment is designed to protect it from extreme hazards (earthquake, flooding and tornado). An ultimate backup generating set is today installed on each EDF reactor in service. 10 years after Fukushima, what safety improvements for nuclear facilities in France? • 11