IRSN, Institut de radioprotection et de sûreté nucléaire

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Enhancing Nuclear Safety


Research units

Pressurized water reactor safety assessment department (SEREP)

The PRW Safety Assessment Department (SEREP) is responsible for all technical activity to assess operational safety of all pressurised water reactors from initial start-up until final shutdown, analysing the feedback and periodic safety reviews.

This department therefore:

  • from a safety viewpoint, examines information on reactor commissioning trials and operation (events, discrepancies, anomalies, unit outage and operating reports, test results, etc.), identifies and classifies the safety problems in order of importance, takes charge of or initiates their analysis, as necessary, and gathers elements to formulate an opinion on solutions or supporting arguments proposed by the operators
  • continuously assesses pressurised water reactor safety from feedback data, the result of probabilistic safety assessments or its own indicators and suggests any action it deems necessary to maintain these reactors at an acceptable safety level
  • analyses safety dossiers forwarded under the regulatory context for these reactors; it is therefore particularly involved in analysing safety reports, the General Operating Rules for periodic tests and technical operating specifications and, if required, authorisation requests for fuel loading or divergence. As part of the periodic safety reviews, assesses the approach, work programmes and reports presented by the operators.



SEREP sections


  • Periodic Safety Reviews Section (BRS)
  • Maintenance and Anomalies Assessment Section (BEMA)
  • Normal Operational Referential Assessment Section (BEREN)
  • Incidents and Events Analysis Section (BAIE)
  • PWR Safety Assessment Section (BESP)

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F. Rousseaux (chargée de site/IRSN) s'équipe pour entrer dans une zone contaminée du BR ©Noak/Le bar Floréal/IRSN


By phone: +33.(0)


or e-mail, head of unit, Franck Bigot


Pressurized water reactor safety assessment department

BP 17
92262 - Fontenay-aux-Roses
Cédex - France


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