Robust and Resilient Severe Accident Mitigation

摘要

Fukushima accident suggests that current safety goal has to be changed to properly address the major impacts of nuclear accidents on the society including the health effect, property damage and environmental contamination. Based on these lessons from the Fukushima accident, a conceptual design and a new approach for implementing the prevention and mitigation measures for the severe accident are proposed. Instead of an optimistic view on progression of severe accident and available resources, the worst case scenario is considered to be prepared for the unexpected situation. With a safety goal of practically eliminating the significant release of radioactive material, an improved approach for preventions and mitigation strategy is proposed. It consists of a new severe accident management with dedicated mitigation measures and qualified essential instrumentations to take timely recovery action. It is designed to be more robust and resilient than the conventional system.