CEPN is a a non-profit organisation created in 1976 to establish a research and development centre in the fields of optimisation of radiological protection and comparison of health and environmental risks associated with energy systems.

This program was initially strongly focused on the development and application of the principle of optimization of radiological protection. Over the past few years, however, the group’s research programme has also been directed towards the involvement of stakeholders in radiological risk assessment and management, and spreading the radiological protection culture.

The studies are undertaken by a group of around fifteen engineers and economists. The research programme is evaluated by a Scientific Council.

The association currently has three members: the French public electricity generating utility (EDF), the Institute of Radiological Protection and Nuclear Safety (IRSN) and the French Alternatives Energies and Atomic Energy Commission (CEA).

CEPN is a a non-profit organisation created in 1976 to establish a research and development centre in the fields of optimisation of radiological protection and comparison of health and environmental risks associated with energy systems.

Recent publications

ALARA Self-Evaluation Guide


ALARA Self-Evaluation Guide


The optimization principle is a comprehensive and iterative approach for using protection and safety measures to make radiation exposure, and the probability and magnitude of potential exposure, As Low As Reasonably Achievable or ALARA. The application of this principle for occupational radiation protection in nuclear power plants implies the elaboration of dedicated ALARA programmes. The evaluation of the efficiency of such programmes cannot be done using only dosimetric results, but should consider also other factors.

In the framework of a study asked by the Swedish utility Vattenfall – after having been questioned by its regulatory authority –, CEPN elaborated an “ALARA Self-Evaluation Guide”. The objective of this Guide is to review the application of the ALARA Principle in a given nuclear power plant through main topics of interest. Six main topics are proposed:

  • On-site radiation protection organization,
  • Organization and management of the ALARA programme,
  • Work planning and organization,
  • Factors to be addressed in work preparation (“radiation protection in the field”),
  • Work implementation,
  • Management of feedback

Each topic is divided into sub topics, each sub topics is evaluated using a three or four levels scale. Level 1 ensures that minimum ALARA requirements are met when the other levels assess the organization more deeply and are more focused on the qualitative and subjective implementation of the ALARA principle e.g. relationship between interlocutors or broadcast of results. A scoring system is also proposed for the evaluation, which can be used to identify on a score basis the strong or weak areas.

Most of the questions and recommendations proposed in this document are based on international reviews, good practices reports and guidelines published by IAEA, NEA, INPO, as well as from feedback experience collected within the ISOE community. This ALARA Self-Evaluation Guide can thus be seen as a list of successful procedures and current good practices from various sources that have proved their efficiency to optimize the radiation protection with a strong involvement of the various actors.

International ISOE Symposium, Fort-Lauderdale, 9-11 January 2017. (A1272)

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Exhibitions / Projects

Vous avez dit Radioprotection ?

Vous avez dit Radioprotection ?

Did you Say Radiation Protection? Stories of X-Rays, Radioactivity, etc …” is a traveling exhibition devoted to radiation protection, that is to say all the means to protect workers, the public and the environment from potentially harmful effects of X-rays and of radioactivity.

Rayons Santé

Rayons Santé

Rays and Health” is a traveling exhibition that aims to educate the general public on the uses of X-rays and radioactivity in medicine by highlighting the expected benefits but also the risks. Several topics are discussed to encourage caregivers and patients to have a reasoned and cautious approach in order to make the best use of X-rays and radioactivity for health.

ETHOS in Belarus

ETHOS en Biélorussie

Le projet européen ETHOS avait pour but d’améliorer durablement les conditions de vie des habitants des villages dont la vie quotidienne a été fortement affectée par la présence à long terme de contamination radioactive à la suite de l’accident de Tchernobyl. Il s’agissait d’une nouvelle démarche pluridisciplinaire basée sur une implication forte de la population dans l’évaluation et la gestion du risque radiologique en concertation avec les autorités locales, régionales et nationales et des experts biélorusses.