committee was unable to evaluate the R&D plans in detail. The committee cannot provide an endorsement of the R&D in the absence of sufficient information that allows evaluation of the details of these plans.


In light of the foregoing discussion, the committee offers the following recommendations to promote the resolution of the technical uncertainties with respect to the MST processing step.

  1. SRS should resolve the technical uncertainties with the MST processing step as soon as possible by implementing an R&D program focused on the technical uncertainties noted above, and others that are consistent with a systems engineering approach to salt processing. This R& D should provide a demonstration that MST functions satisfactorily with each of the cesium separation process options.

  2. Simultaneously, a well-focused R&D program should be conducted to examine alternatives to MST. This program should have a level of effort commensurate with the risk of process failure and should continue until MST processing can be demonstrated to meet the saltstone, DWPF throughput, and DWPF glass requirements.

  3. As part of its efforts to resolve technical uncertainties, SRS should establish requirements for and reliable sources for the manufacture of MST.

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