The mission of the Severe Accident and Radioactive Release Assessment Department (Sagr) is to conduct assessment studies on accident situations that could affect the water reactors and result in a meltdown of the reactor core.
This department therefore:
- analyses the progress of and radioactive release from accidents as a result of internal initiating events leading to core meltdown and formulates opinions on measures to prevent and limit the consequences of such accidents,
- in conjunction with the other IRSN divisions, particularly the Major Accident Prevention Division, acquires and implements tools to assess risks of loss of containment and explosion, with the associated radioactive release,
- coordinates work in the context of level 2 probabilistic safety assessments of light-water reactors, performs the corresponding work in its areas of expertise and participates in assessing probabilistic studies carried out by the operators,
- participates in appraising existing or planned provisions by the operators to limit the consequences of serious accidents likely to affect the reactors,
- conducts the studies required to define the technical bases to be adopted in putting together special intervention plans,
- takes part in developing the scientific resources required by the IRSN Emergency Response Center to develop diagnostics and prognosis in an accident situation,
- participates in defining and implementing R&D programmes in its areas of expertise,
- in its areas of expertise, performs support studies in the analysis or carrying out of the Institutes cross-cutting projects.
To successfully complete its missions, Sagr consults as necessary with designers and operators, other units in the division and the other IRSN divisions, within its areas of expertise.
- Severe Accidents and Radioactive Release Analysis Section (BAAGR)
- Probabilistic Assessment of Severe Accidents Section (Bepag)
- Physics of Severe Accidents Section (BPhAG)