The SFP integrity evaluation framework is based on the seismic hazard data generated through the procedures set by Taiwan Power Company (TPC) using Senior Seismic Hazard Analysis Committee Level 3 (SSHAC Level 3) procedures. The study includes both structural and non- structural analysis. The structural analysis criteria are provided for evaluating potential failure of SFP walls and floors. For the non-structural analysis the following aspects are addressed, such as piping connections, fuel gates, and anti-siphoning devices, as well as an evaluation of SFP sloshing and an approach for assessing the heat up and boil-off of SFP water inventory.

The research is based on the requirements of Near-Term Task Force Recommendations 2.1 (NTTF 2.1), developing a methodology applicable to the guidelines for use in Taiwan. It investigates evaluation process and acceptance criteria for extreme events such as seismic. Criteria are also provided for SFP seismic-induced sloshing losses and boil-off losses using site-specific parameters to evaluate the ability of SFPs to retain adequate water inventory for 72 hours.

Overall, the study ensures the safety of SFP in Taiwan. For developing a methodology that aligns with the requirements of Nuclear Safety Commission (NSC), NARI systematically considers all seismically induced failures that could result in rapid draining and guarantee the capability of SFPs to deal with extreme events. It would mitigate the public concern about nuclear safety. The approach also provides criteria for evaluating both the structural and non-structural aspects of the SFP. It can be applied to those SFPs of any nuclear power plants, regardless of whether they are in operation or undergoing decommissioning. Currently, the research results are being applied to other technical services cases.
 

Currently, SFPs remain at the critical first-line of the future storage and management. Therefore, the technology developed in this study can continue to provide crucial expertise for safety assessment. It can be applied to NPPs that are operation or decommissioning and also aids regulatory authorities as well as owners in clarifying SFPs safety. This ensures that SFPs continue to comply with relevant regulatory requirements, thereby enhancing public confidence in the safety of nuclear power plants.