By David J Lechel

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Aiken SC to Dr. , Idaho Falls, ID, Subject: Physical Behavior of Pu-238 Oxide (U), October 17, 1996. S. Department of Energy), 1989. TRUPACT-H Content Codes (TRUCON), DOEAWF’P 89-004, Revision 3, Carlsbad, NM, July 1989. S. Department of Energy), 1995a. CH-TRU Waste Packaging Optimization Report, Revision 1, DOE Carlsbad Area Office, December 1995. S. Department of Energy), 1995b. Evaluation of FeasibiliQ Studies for Private Sector Treatment of Alpha and TRU Mixed Wastes, DOE/ID-10512, DOE Idaho Operations Office, May 1995.

Although the final filter diffusivities are somewhat uncertain, it appears that they would provide at least a ten-fold decrease in the resistance of the packaging layers of confinement. These filters also appear to meet the NRC’s requirements and their characteristics are fairly well known. Therefore, it has been assumed that a ten-fold decrease in the resistance values are achievable for Path 5. 86 watts per drum (the 40 watts per TRUPACT-11 limit) and, while it is possible that more effective filters could be developed, the performance, in terms of increasing the wattage limit, would be essentially unchanged from the performance of the filters considered here.

1 Expected Value - Volume Disposed by 2006 Figure 10 and Table 12 show the expected values for the drum equivalents of Pu-238 TRU waste disposed by 2006. In all cases, Path 3 (headspace hydrogen sampling) clearly has the bestexpected outcome regardless of the regulatory uncertainties. For Path 3, the expected value for drums disposed by 2006 ranges from 1,449 (pessimistic NRC) to 2,536 (optimistic NRC). This is roughly 10 times the near-term disposal volume for Path 2 and 18 times the near-term disposal volume for Path 4.

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