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The Working group on the analysis and management of accidents (WGAMA); A Historical review of major contributions

Herranz, L. E.*; Jacquemain, D.*; Nitheanandan, T.*; Sandberg, N.*; Barr$'e$, F.*; Bechta, S.*; Choi, K.-Y.*; D'Auria, F.*; Lee, R.*; Nakamura, Hideo  

WGAMA started on Dec. 31st 1999 to assess and strengthen the technical basis needed for the prevention, mitigation and management of potential accidents in NPP and to facilitate international convergence on safety issues and AM analyses and strategies. WGAMA addresses reactor thermal-hydraulics (Thys), in-vessel behavior of degraded cores, containment behavior and protection, and FP release, transport, deposition and retention, for both current and advanced reactors. This paper summarizes such WGAMA contributions in Thys, CFD and severe accidents, which include the Fukushima-Daiichi accident impacts on the WGAMA activities and their substantial outcomes. Around 50 technical reports have become reference in the related fields, which appear in References. Recommendations in these reports include further research, some of which have given rise to the joint projects conducted or underway within the OECD framework. Ongoing WGAMA activities are numerous and a number of them are to be launched in the near future, which are shortly mentioned too.

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