THE FEASIBILITY OF USING FLY ASH AND ZEOLITES AS VOID SPACE FILLER IN LOW-LEVEL WASTE PACKAGES TO MITIGATE POST CLOSURE SUBSIDENCE AT A LOW-LEVEL WASTE DISPOSAL CELL

摘要

Great potential exists for subsidence of closed low-level waste (LLW) disposal cells at manyrnLLW disposal sites across the United States. This post-closure subsidence can greatly increasernthe potential for radionuclides to be released to the environment through the infiltration of waterrninto the waste cell and/or the release of radioactive gases. Post-closure subsidence can be causedrnby a variety of factors, but two of the primary causes are package void space and packagerndegradation.1rnThe Department of Energy, Nevada Operations Office (DOE/NV) is currently evaluating thernconsequences and mitigation of post-closure subsidence for its Radioactive Waste ManagementrnSites (RWMSs) at the Nevada Test Site (NTS). The RWMSs are LLW disposal sites currentlyrnused for the land disposal of U.S. Department of Energy (DOE) LLW waste generated at variousrnsites across the United States. As a potential mitigation measure, DOE/NV has conducted this