Improvement of biosphere assessment methodology for performance assessment of geological disposal facility

Yoshida, Hideji*; Miki, Takahito*; *

JNC TJ8400 2001-001, 348 Pages, 2001/02

JNC-TJ8400-2001-001.pdf:10.54MB

This report contains discussions about development of biosphere assessment model for a solid release to a soil Geosphere-Biosphere Interface, refinement of methodology for the selection of parameter values and comparison of parameter values between H12 Report and other Japanese safety assessments. Regarding the development of biosphere assessment model for a solid release to a soil Geosphere-Biosphere Interface, it was confirmed that it can, with some relatively minor modifications, be applied directly to a liquid release to soil. Regarding the refinement of methodology for the selection of parameter values, the data methodology was simplified in which the effort is focused on selecting data for key uncertain parameter. The methodology can be simplified through the use of techniques such as the categorization of available data, the grouping of parameters, the application of stopping rules and the use of the question set and decision tree. Regarding comparison of parameter values between the JNC's second progress report and other Japanese safety assessments, it is recognized that some parameters values which were used in the JNC's second progress report were different from those which were used in other Japanese safety assessment. And it was confirmed that data source and assessment context is very important for the selection of parameter values.