Assessment of the Safe Shutdown Earthquake Robustness Against On-site Observations

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This activity of the Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear Installations (CSNI) Working Group on Integrity and Ageing of Components and Structures (WGIAGE)  is entitled “Assessment of the safe shutdown earthquake (SSE) robustness against on-site observations” and it was based on medium-term strategies for the WGIAGE seismic engineering subgroup and the lessons learnt from the Fukushima Daiichi Nuclear Power Plant accident. The question of under-estimation or over-estimation of seismic hazard now or during the original design of nuclear power plants was raised in the WGIAGE group and this activity is looking for evidence on this issue. The objective is to collect and analyse any relevant observations that could help to assess seismic hazard results and identify possible evidence of under-estimation of seismic hazards or the opposite, and to provide the international community with a new, generic and efficient procedure that could be widely applied on nuclear power plant sites (especially in countries with low to moderate seismicity).

The main tasks were to collect relevant information on seismic monitoring and all seismic motion records on the nuclear power plant sites (or in their vicinity) and SSE for the sites under consideration (which could include original SSE and any re-evaluated SSE); and analyse the consistency between SSE and available observations.