EXECUTIVE SUMMARYThis report provides an alternative strategy evolved from the current Hanford-Site Tank Waste Remediation System (TWRS) programmatic baseline for accomplishing the treatment and disposal of the Hanford Site tank wastes. This optimized processing strategy performs the major elements of the TWRS Program, but modifies UK deployment of selected treatment technologies to reduce the program cost. The present program for development of waste retrieval, pretreatment, and vitrification technologies continues. but the optimized processing strategy reuses a single facility to accomplish the separationsllow-activity waste (LAW) vitrification and the high-level waste (HLW) vitrification processes sequentially, thereby eliminating the need for a separate HLW vitrification facility. This facility is called the Sequential Processing Facility (SPF). Reuse of the processing facility for multiple functions reduces capital and expense costs, minimizes the land committed for radioactive waste management, and reduces the decontamination and decommissioning task.To do this, all waste treatment functions and associated technologies currently identified in the programmatic baseline are incorporated into a single process facility. This strategy will require the modification of the interim system constraints, but will maintain the same system end states. These end states contained in the current programmatic baseline are ...
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WHC-SD-WM-TI-694Revision 0 single-shell (SST) and double-shell tank (DST) farm operable units, (2) vitrified LAW disposed at the Hanford Site, and (3) vitrified HLW transported to a federal repository for disposal.
SYSTEM DESCRIPTION FOR LOW COST STRATEGYThe SPF initially separates tank wastes into LAW and HLW fractions using enhanced sludge washing and cesium ion exchange. The separated HLW fraction is stored in existing DSTs and the LAW fraction is vitrified. After vitrification of the LAW fraction, the unnecessary equipment is removed when it is in the way, and new equipment is installed as required by the HLW vitrification process.
COST AND SCHEDULE COMPARISONThe total life-cycle cost estimate for the TWRS Program was previously estimaed in the Multi-Year Work Plan, which is updated annually (WHC 1995). Adoption of the optimized processing strategy results in the reduction of total life-cycle cost to $15.6 billion in 1995 dollars.
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