John NAKOSKI, United States
|Member(s):||All NEA member countries|
Under the NEA Statute
International Atomic Energy Agency (IAEA)|
|Date of creation:||30 June 2013|
|End of mandate:||31 December 2020|
Mandate (Document reference):
Mandate (Document extract):
Extract from document NEA/CSNI/R(2017)17
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 Working Group shall report to the Committee on the Safety of Nuclear Installations (CSNI) and assist that Committee with its work. The Working Group will also collaborate with, and respond to requests from, the Committee for Nuclear Regulatory Activities (CNRA) and other Working Groups of the CSNI. The WGEV programme of work will be approved by CSNI.
The focus for the Working Group’s activities is external hazards that are of sufficient common interest to allow sharing of approaches for analysis and oversight. Determination of the response of structures and components to seismic hazards is performed by the Subgroup on Seismic Engineering of the Working Group on Integrity and Ageing of Components and Structures (WGIAGE), and combinations of seismic hazards with other hazards (e.g. flooding) are part of the WGEV scope. The Working Group on Risk Assessment (WGRISK) also performs work related to the assessment of the plant response and consequences of events including external hazards. 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 or 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 may be extended to include man-made hazards if a need for specific activities in this direction 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.
The Working Group will be led by a chair, supported by a bureau of up to six of the leading members of the Working Group. Specifically, the WGEV shall: