RESULTS FROM POST-CLOSURE DOSE ASSESSMENT MODELS WITH 'ALTERNATIVE' LEVELS OF DETAIL

摘要

An important issue for long-timescale dose assessment is how to use site descriptive material to the assessment model over extended time periods. Assessments need to strike a balance between simple models and more complex approaches that draw more extensively on this site-specific information. This paper explores the relative merits of complex versus more stylized biosphere models in the context of a site-specific assessment. We report on work undertaken on behalf of, and in cooperation with, the Swedish Radiation Safety Authority (SSM) in review of the recent license application submission by the Swedish Nuclear Fuel and Waste Management Co. (SKB). The work is contributing towards Working Group 6 of the International Atomic Energy Agency's (IAEA's) programme on Modelling and Data for Radiological Impact Assessments (MODARIA), which is developing guidance on addressing environmental change in long term safety assessments of radioactive waste disposal facilities. Complementing this is material from CIEMAT's development of detailed soil models capable of dealing with changes of soil hydrogeochemistry in response to changes in the depth of the water table.