Linear entity at the origin of the FNIRP risk of the Arrow in Sarthe.

The origin of the risk characterises the real-world entity which, through its presence, represents a potential risk. This origin may be characterised by a name and, in some cases, a geographical object locating the actual entity causing the risk. The location of the entity and the knowledge of the hazardous phenomenon are used to define the risk pools, the risk-exposed areas that underpin the RPP.For NPPs, this entity may, for example, correspond to a river, a geologically unstable area.