Alternatives for High-Level Waste Salt Processing at the Savannah River Site (2000) / Chapter Skim
Currently Skimming:
Screening Procedure
Screening Procedure
Pages 20-34
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 20... ...
and WSRC established a procedures whereby the cesium separations literature and patents were searched, along with evaluation by panels of experts of cesium removal processes, to select alternative options to replace the current, unacceptable ITP process for high-level waste (HEW) salt removal, treatment, and disposal.
|
From page 21... ...
SOURCE: Westinghouse Savannah River Company. backup has been conducted, the committee understands that the current plans by WSRC appear to include an evaluation of several other highly ranked process alternatives.
|
From page 22... ...
. A ranking of the 16 process technologies uncovered by the literature and patent search revealed that ion exchange, precipitation, adsorption, extraction, filtration, and biological process were the most prominent techno~ogies (over 95 percent)
|
From page 23... ...
In selecting the initial list of cesium removal alternatives (designated by WSRC as Phase D, a team of experts (Savannah River Site High Level Waste Salt Disposition Systems Engineering Team, 1 99Ba, 1 99Se) began by TABLE 2.2 Minimum Critical Needs and Boundary Conditions and Constraints Critical Needs Meet all applicable safety criteria for protection of personnel Meet all applicable environmental regulations All waste must go to final disposition forms Meet federal facility agreements and site treatment plan regulatory commitments Accommodate other Savannah River Site (SRS)
|
From page 24... ...
It should be noted, however, that these ~ ~ categories do not necessarily correspond to the processes identified in the initial literature compilation TABLE 2 3 Initial Selection of Cesium Removal Process Alternatives (Phase 'hong List')
|
From page 25... ...
waste, those that had an inadequate scientific base, or those that had obvious and detrimental safety implications. The list of 83 was further reduced by combining some of the process variations and those pro formas that were later submitted (Savannah River Site High Level Waste Salt Disposition Systems Engineering Team, 199Se)
|
From page 26... ...
Supernate Separation-DWPF Vitrification ~ 8) Direct Disposal as Grout SOURCE: Savannah River Site High Level Waste Salt Disposition Systems Engineering Team (1 998b)
|
From page 27... ...
, using a general guide to the procedure for the assessment (Savannah River Site High Level Waste Salt Disposition Systems Engineering Team, 19980) was issued for the 18 process alternatives.
|
From page 28... ...
Zeolite ion exchange received a total weighted evaluation score of 70.65 that would have rated it the number three candidate, but it was rejected in favor of the flexibility of crystalline silicotitanate ion exchange with DWPF vitrification. The direct grout process was excluded from further consideration for non-technical reasons such as the time required to provide for public approval, and regulatory approval (Savannah River Site High Level Waste Salt Disposition Systems Engineering Team, 1999b, p.
|
From page 29... ...
regulatory/permitting cost (schedule, life cycle, repository) SOURCE: Savannah River Site High Level Waste Salt Disposition Systems Engineering Team (19989, 1999b)
|
From page 30... ...
The value of the extensive global literature and patent search also is not clear, based on the fact that all but one of the technologies (bioremediation, subsequently rejected as not being feasible) were identifiecl by the expert judgment of the Savannah River Site High Level Waste Salt Disposition Systems Engineering Team and its consultants during this part of the procedure.
|
From page 31... ...
Reduction of Process Alternatives to Four (Phase Il) The results of the flow sheet analyses are given in terms of rates of use of resources, production of products, or environmental releases.
|
From page 32... ...
Finally, the technology scoring results appear to be largely insensitive to uncertainties and variations among the candidate processes for process simplicity and engineering maturity. The Savannah River Site High Level Waste Salt Disposition Systems Engineering Team (1999b)
|
From page 33... ...
b) More timely attention in the screening procedure to uncovering potential process risks and their scientific and technical uncertainties than was evident for at least the final four cesium separation process alternatives could have lead to recommendations for the R&D necessary to bring each to a point where more rigorous evaluation and final selection could be accomplished.
|
From page 34... ...
", as noted previously the committee concludes that the screening procedure was cumbersome, complex, and lacked transparency to document the technical soundness of an evaluation and selection of appropriate preferred alternatives based primarily on the best judgment of experts using many qualitative factors. The committee recommends that future such evaluations, depencling on expert jucigment, be documented in a clear, easily understandable and traceable manner to allow for viable reviews.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.