Modification of severe accident consequence analysis calculation method of nuclear power plant and consideration of effect of discount rate

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo  

The authors introduced the external cost regarding severe accident as an index for severe accident consequence analysis of nuclear power plants in the previous work. In this research, we modify the calculation methods of two components of the external cost regarding severe accident; decontamination cost and health effect cost, in order to obtain more reality-based results. The decontamination cost calculation method is renewed based on data obtained from decontamination demonstration project of JAEA and land use data of Ibaraki Prefecture. Willingness to pay is used to estimate the health effect cost instead of human capital method. To investigate the effect of discount rate on severe accident consequence, sensitivity analysis was performed using discount rates from 0%, 1%, 3%, 5%. Changes of the fractions of the costs comprising the external cost regarding severe accident are very small even in the case of discount rate of 5%.