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Executive Summary
Pages 1-9

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From page 1...
... Two of the drain tanks store the now solidified fluoride salts containing most of the uranium and plutonium fuel. A third "flush" drain tank stores the fluoride salt mixture used to flush the system piping, an operation that imparted to the flush salt a small inventory of radioactive species.
From page 2...
... Aside from periodic maintenance checks and reheating to submersing temperatures, the facility essentially lay dormant until recent years, when migration away from the drain tanks of both fluorine and UFO (representing more than 10 percent of the total uranium) was detected in the system.
From page 3...
... PURPOSE OF THIS REPORT The Peretz (1996c) report, published in August, identifies various technical alternatives for the treatment and disposition of the radioactive fluoride salts presently stored in three drain tanks.
From page 4...
... For in-tank fluorination to succeed, major issues need to be resolved, among them the potential for effective redissolution of all the solid phases in the drain tanks and evaluation of the extent of corrosion damage to the tank walls due to the effects of the complex interactions of ionizing radiation and fluorine compounds. Some alternative approaches exist within this favored technology.
From page 5...
... The pane} finds that the final waste disposal objectives in the proposed (Peretz, 1996c) alternatives 1-6 are presently insufficient to lead to a sound remediation strategy and concludes that interim waste storage (alternative 7)
From page 6...
... Once the pertinent assessments of likelihood and magnitude of hazard scenarios are available, present safety standards and risk analysis methodologies, properly applied, can provide adequate delineation of hazards and their potential for becoming risks. In a risk analysis of the MSRE drain tanks, an overly conservative, upper-bound estimate of any particular risk is undesirable if the quantitative results are used to choose among various remediation alternatives, because this approach might then fail to identify the course of action with the least risk.
From page 7...
... Examples and suggestions of this kind are contained in the report, particularly in Chapter ~ and Appendix E These technical options, offered as suggestions for consideration to MSRE project personnel, are secondary to the basic recommendation that MSRE remediation work is ready to proceed, with the fluorination approach the most promising way to remove uranium, given the present state of knowledge.
From page 8...
... to make a fully informed decision at the onset. Because the final resolution of disposal alternatives may take considerable time, the panel suggests that DOE use a phased decision strategy focusing on interim storage, with the flexibility it provides, rather than trying to make a final disposition alternative determination in the near future.
From page 9...
... adhesives Mom requirements far ukim~e d~poshion in geologic repositories o~she, because these long-te~ storage options are not developed sufficiently to define Anal waste acceptance crheris~ It appears that resolution of uldm~e (geologic) disposal she criteria and characteristics probably lies beyond the time horizon of the ASH cleanup pr~ec1 The panel ~ ate 1h~ any processing of 1he Mel sags ma prevent them cl=~0c~ion a.


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