Guide related to the sanitation of structures in basic nuclear installations. Guide Nr 14, Release of 30 August 2016

After having indicated the relevant regulatory texts and guides, this guide defines ASN recommendations for the sanitation methodology to be applied when, for example, some premises of buildings are subject to a change of use, are to be demolished, or are to be cleaned after events which occurred during operation. Some definitions are first specified: sanitation objective, verification criterion, singular point, structure, area. After having rather briefly recalled the general doctrine adopted for waste management in basic nuclear installations, the guide states the ASN doctrine regarding structure sanitation by presenting various concepts: complete sanitation, extensive sanitation, and sanitation during operation. It presents principles of sanitation of constituent structures of an area which may produce nuclear wastes (three defence lines are distinguished: thoughtful definition of sanitation modalities, confirmation of the conventional character of structures after sanitation, radiological control of any waste). Administrative procedures are then addressed: before sanitation works, during sanitation works, and after sanitation works (depending on the compatibility of structure radiological condition). Quality assurance requirements are evoked. The guide then describes the modalities of definition of the three different defence lines, and indicates requirements regarding sanitation works (control of contamination dissemination, conditions of intervention, case of civil engineering metallic structures, control of remaining structure elements). A peculiar case is briefly addressed: sanitation of removable structure elements. Appendices indicate the main themes addressed by the sanitation methodology, and by the sanitation assessment. A model sheet is proposed to specify the downgrading of a premise which was previously classified as an area of possible production of nuclear wastes