Correlation between safety assessment and WDFs in NPP decommissioning

Korea Hydro and Nuclear Power (KHNP) made a decision for permanent shutdown of Kori-1 on June 18th, 2015, which, finally, has been shut down since June 19th, 2017. To date, Korea has no decommissioning experiences on a commercial nuclear reactor but on a research reactor. We try to suggest systematic application of those correlations for the effective decommissioning of Kori-1 NPP. Safety assessment is one of the most important processes for the safety of on-site occupational workers and nearby residents. Therefore, WDFs reflecting the results of safety assessment will highly influence decommissioning activity costs. However, accurate safety assessment prevent more drastic increase of costs occurred by severe accidents. From this study, we find that there are deep correlations between safety assessment and decommissioning activities, which eventually leads to rational, economical and safe decommissioning