Seismic ground motion parameters for automatic seismic trip system of nuclear power plants

After the Fukushima accident in Japan, the nuclear safety regulatory authorities of South Korea and other countries have required the installation of automatic seismic trip system (ASTS). In 2019, the National Nuclear Safety Administration issued the Seismic Design and Evaluation of NPPs (HAD102/022019), which specifies the role of seismic instruments in nuclear power plants (NPPs), including the role of ASTS. At the same time, it also puts forward relevant requirements on whether to install the ASTS. In 2019, China revised and issued Code for seismic design of nuclear power plants (GB 50267-2019), the seismic alarm index should be fully demonstrated. According to the investigation and study of the nuclear safety regulations and standards, and combining with the seismic level of NPPs site in China, this paper puts forward some suggestions on whether to set ASTS and the selection of ground motion parameters of ASTS.