[en] This article presents the periodic safety review performed for French nuclear facilities with a focus on Nuclear Criticality Safety (NCS). Among the requirements a licensee must comply with for his nuclear facilities, the articles L. 593-18 and L 593-19 of the environmental code states that the licensee must carry out a periodic safety review (PSR). It says that ''the licensee of a nuclear installation carries out a safety reassessment of its facility periodically, taking into account the best international practices. This review must allow a clear view of the facility's situation in regard to the applicable rules, and update the risks or drawbacks concerning the facility (...) taking into account in particular the facility's state, its operating feedback, the evolution of knowledge and of rules applied to similar facilities. The periodic safety review should occur every ten years. However, the creation decree could define a different periodicity depending on the facility's specific characteristics. The licensee must send to the Nuclear Safety Authority and to the ministries in charge of nuclear safety a report setting out the reassessment conclusions and, if necessary, the measures to be taken in order to mitigate any observed non-conformity or to improve safety.'' The article will present the objectives of the PSR, the expected content of the PSR report written by the licensee, a detail description of the NCS issues related to the PSR (with several examples) and the schedule and proceedings of its review. Finally, this article will show that the PSR is a major step of continuous nuclear safety improvement in France and a good opportunity to improve transparency, especially in the context of life extension of nuclear facilities. (authors)