How will the 4th periodic safety review of the 1,300 MWe reactors benefit from the experience of the 4th periodic safety review* of the 900 MWe reactors? The objectives of the two periodic safety reviews* are similar, notably with the aim of upgrading towards the level of safety of the Flamanville EPR* reactor. Moreover, numerous baseline safety requirements and study methods examined for the 4th periodic safety review* of the 900 MWe reactors are being reused for the review of the 1,300 MWe reactors. Many of the modifications adopted for the 900 MWe reactors are also reused for the 1,300 MWe reactors. This reuse enables ASN to speed up the examination of the generic phase of the 4th periodic safety review* of the 1,300 MWe reactors, while enabling EDF to better anticipate the design of the modifications. Although the 1,300 MWe reactors are very similar to those of 900 MWe, there are also a number of specific features that must be pointed out. Apart from the power of the reactors, we should for example mention the containment* which has a double wall on the 1,300 MWe reactors, whereas it only has a single wall on the 900 MWe reactors. The particularities of the 1,300 MWe reactors are taken into account during the studies carried out on the occasion of their 4th periodic safety review*, whether to guarantee management of equipment ageing or to improve the safety of the installations. What are the differences between the 1,300 MWe and 900 MWe reactors? The issues of the 4th periodic safety review of the 1,300 MWe nuclear reactors • 19
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