1 2 3 3 Depressurisation of the reactor containment In the event of an accident situation leading to a pressure rise in the containment, this device enables the air inside it to be depressurised and filtered before release, in order to prevent damage to the containment. The aim is to make the filter more robust so that it remains operational in the event of an earthquake. 2 Ultimate water source This consists of new wells, ponds or tanks, depending on the sites, providing water to supply the steam generators and the spent fuel pool, in addition to the existing means. All the reactors shall be equipped with an ultimate water source. For the last sites, temporary sources have been put in place. 1 Improving the safety of the spent fuel pool Several improvements have reinforced the safety of this pool: reinforced instrumentation so that it can withstand an earthquake, automatic leak isolation on the pipes connected to the pool, etc. Fukushima, the inevitable disaster scenario Extension of the major advances in safety to all the nuclear facilities in France The final result of the improvements in the safety of nuclear facilities in France owes a lot to Fukushima. Setting more stringent standards than the level required by Europe, France has maintained a strategy of continuous improvement. Today, the measures taken for all the sensitive sites give an extra margin of three days from the time the accident occurs. This extra margin is crucial. See glossary pages 33 to 36 30 • Les cahiers Histoire de l’ASN • November 2023
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