Recent Safety Assessment of a Reference Geological Disposal System for Radioactive Waste from Pyro-Processing in Korea

For a long-term safety assessment to be comprehensive, complex scenarios should be assessed systematically by combining various scenarios with aleatory uncertainty. A methodology for a risk-based safety assessment of complex scenarios considering the long-term complementary impacts on the disposal system has been newly suggested by KAERI. This new methodology was recently implemented in an upgraded version of KAERI's TSPA model (K-PAM). KAERI's current TSPA model contains many necessary abstractions and a limit in associating the key physical processes. As a further study, the TSPA model will be moved to the process model level by utilizing a high-performance computing system. (author)