Development of dose evaluation method for confirmation of completion of decommissioning of nuclear facilties, 2; Development of dose evauation method caused by surface soil contamination after site release

Miwa, Kazuji ; Namekawa, Masakazu*; Shimada, Taro ; Takeda, Seiji 

For development of technical foundation to confirm the completion of the decommissioning of nuclear facilities, JAEA is developing the methodology to evaluate the dose in considering radionuclides migration by not only groundwater migration but also surface water migration and surface soil migration. We studied estimating methods for radionuclide migration between the surface water and surface contaminated soil, changes of radionuclide distribution, and direct outflow of radionuclides to the sea. In addition, preliminary analysis of the surface water migration and soil migration based on the topography and rainfall conditions is performed by using a general-purpose water and soil runoff evaluation code. The methodology will be applied to evaluate the dose by using the out put of the surface water migration and soil migration.