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Source term modeling and analysis for vault/trench facilities located in an unsaturated zone

机译：位于非饱和带的拱顶/沟槽设施的源项建模和分析

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This report outlines an analytical work on the third test case, Test Case 2b, specified by the IAEA sponsored co-ordinated research programme on the safety assessment of near-surface radioactive waste disposal facilities (NSARS). Test Case 2b focuses on a source term modeling of a disposal facility in an unsaturated soil layer. This report includes an analytical method used, groundwater flow analyses, a screening approach used, and transport calculations carried out, for two types of facilities: (1) a concrete vault with grout backfill around the waste, and (2) an open trench with soil backfill around the waste. Optional infiltration barrier test cases for two types of facilities are also analyzed. The results of the Test Case 2b are presented in this report, and show that the effectiveness of the concrete vault to reduce the infiltration rate to the facilities. (author). (ERA citation 20:028858)

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