The main mission of the Working Group on External Events (WGEV) is to improve the understanding and treatment of external hazards that would support the continued safety performance of nuclear installations, and improve the effectiveness of regulatory practices in NEA member countries.
The focus for the working group's activities is external hazards that are of sufficient common interest to allow the sharing of approaches for analysis and oversight. Determination of the consequences of seismic hazards is performed by the seismic subgroup of the Working Group on Integrity and Ageing of Components and Structures (WGIAGE), and combinations of seismic with other hazards (e.g. flooding) are part of the WGEV. Initially these activities will concentrate on natural hazards. Man-made hazards will be addressed only if there is a particular link to a natural hazard, e.g. when a man-made hazard is used as a bounding/covering event for a natural hazard (for instance, protection against high winds is thought to be ensured by design against explosion pressure waves). Later on, the scope of work might be extended to include man-made hazards if a need for specific activities in this area is identified. For external hazards, experience, lessons learnt and regulatory approaches are shared, and research activities and initiatives are identified to address knowledge gaps that lead to major uncertainties. Members are representatives from regulatory bodies or technical organizations with expertise relevant to external events (e.g. geosciences such as meteorology, geology, hydrology, etc.).
The overall aim of WGEV is to identify best practises for characterising external hazards, and combinations of external hazards, assessing their consequences and providing effective protective features and strategies.
Last reviewed: 14 September 2016