TEPCO is developing a probabilistic risk assessment (PRA) model aimed at improving safety through the selection of important accident sequences and utilization of risk information. The purpose of PRA in enhancing safety is to identify the vulnerabilities of the plant based on the analysis of evaluation results and to formulate safety improvement measures.

Fukushima Daiichi Nuclear Power Plant Accident(1F Accident) on March 11, 2011, resulted in a severe accident due to the impact of Tsunami. Learning from 1F Accident, our company has implemented various countermeasures. This section will introduce the evolution of tsunami PRA at our company, efforts to enhance the tsunami PRA model, and the examination of protective measures based on evaluation results. Additionally, we will present recent initiatives, including examples of risk information being utilized