IRSN, Institut de radioprotection et de sûreté nucléaire

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Research units

Irradiators, Accelerators and Waste Safety Department (SSIAD)

The Irradiator, Accelerator and Radioactive Waste Safety Department (SSIAD) has the task of examining, from a safety perspective:

  • irradiators
  • particle accelerators
  • nuclear laboratories in the north of France
  • and processing and interim-storage facilities for effluents and waste from CEA sites, from the creation of waste until its decommissioning;
  • definitively shutdown nuclear reactors until decommissioning, as well as facilities for the processing and interim-storage of waste from nuclear reactors;
  • waste packages, whether meant for interim storage or disposal, and radioactive waste disposal facilities.


The department has two expertise units: the Package safety and waste management facility appraisal unit (Becid) and the Irradiator, accelerator and reactors in the process of decommissioning appraisal unit (Beirad) and one expertise and research unit: the Radioactive waste disposal facility expertise and research unit (Beris).


The department therefore has the following duties: 

  • to prepare the corresponding expert reports presented by the IRSN to standing groups of experts, particularly at the various stages at which these facilities and transportation operations come under regulatory examination
  • to analyse the safe nature of the waste packages produced with regard to  interim storage and disposal
  • to provide safety expertise assessments for the global management of waste produced by the CEA and EDF as well as the organisation of safety and radiation protection at the CEA
  • to analyse whether sites earmarked for radioactive waste disposal as well as the additional barriers placed between the waste and the natural terrain fulfill safety objectives
  • to monitor, with regard to safety, the design, construction, commissioning tests, operating and decommissioning of facilities which fall within its remit aside from radioactive waste disposal facilities; and to analyse incidents which occur in these facilities at these various stages
  • to monitor, with regard to safety, site reconnaissance, the design, construction, commissioning tests, operating and monitoring of radioactive waste disposal facilities as well as to analyse incidents which occur in these facilities at these various stages
  • to draw relevant lessons for the safety of these facilities and waste packages and to put forward any measures which it considers to be useful in light of these lessons
  • to carry out studies as part of its role to provide expertise regarding the safety of waste disposal facilities and, thereby, to ensure the development and maintenance of the MELODIE program to quantify radionuclide transfers in radioactive waste disposal facilities.


This department is the reference for nuclear facility decommissioning practices and provides, when requested, assistance to other management departments responsible for the decommissioning of facilities to ensure there is coherency in practices.

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By phone : +33 (0)


or by email, head of laboratory, François Besnus



BP 17
92262 Fontenay-aux-Roses
Cédex France


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