Several countries are planning to build new nuclear power plants. In this context, ATMEA, the joint venture formed by French industrial group, AREVA, and the Japanese industrial group, Mitsubishi Heavy Industries (MHI), called upon ASN to carry out a review of the safety options[1] for a new Pressurized Water Reactor known as ATMEA1. According to ATMEA, this medium-output reactor (1100 MWe) is mainly for the export market.