Review of the Analysis of Supplemental Treatment Approaches of Low-Activity Waste at the Hanford Nuclear Reservation Review #1 (2018) / Chapter Skim
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2 Committee's Review of the FFRDC's Draft Methodologies
2 Committee's Review of the FFRDC's Draft Methodologies
Pages 10-16
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From page 10... ...
2, mentions that PRA "usually involves a very structured, systematic, and quantitative analysis explicitly accounting for uncertainties through probabilistic methods. In comparison, semi-quantitative methods are intermediate between a fully numerical PRA and a textual, qualitative risk assessment." Semi-quantitative methods "provide a structured approach to ranking risks with numeric scores, frequently using expert input versus mathematical models." The FFRDC describes qualitative hazards assessment methods as producing "non-numerical estimates of risk, and may use a risk matrix to organize levels of impact and likelihood, and prioritize or rank risks for future action." While the FFRDC states in Document 2, p.
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From page 11... ...
The committee noted some gaps in the draft risk assessment methodology, as described in Document 2 and Presentation 8, as well as Presentation 7, which mentions issues related to transportation of wastes off site. For instance, the committee notes that in the FFRDC's consideration of shipping waste forms outside of Washington State, some additional risks were not explicitly mentioned, in particular, the possibility of transportation accidents would lead to consideration of health risks to populations near the accident sites.
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From page 12... ...
Also in light of congressional interest in application of PRA, to the extent practicable, the committee suggests that the FFRDC discuss in its forthcoming report what type of PRA will be used, the sources of uncertainties in risk assessment data, the parts of the SLAW system to which it will be applied, and the basis for not applying it to other parts of the SLAW system, as well as the basis for selecting the risk analysis techniques applied to other parts of this system and to other risks such as schedule, technology, and cost. It will also be useful for the FFRDC to discuss which risks can be quantified and which can be analyzed using qualitative assessments, e.g., legal and regulatory risks.
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From page 13... ...
The committee notes that it is too early to conclude that cost estimation cannot be adequately based on the data available to the FFRDC. Also, the committee recognizes that the FFRDC will obtain other useful cost data from similar processes and analogous facilities.
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From page 14... ...
Given the complexities involved in the treatment scenarios and the technical challenges involved in treating 177 tanks filled with approximately 56 million gallons of hazardous and radioactive wastes, the committee observes that assessments of the impact of technological complexity and process risks are useful to more fully understand schedule risks. Presentation 8 does not include in the schedule risk the potential that some materials and specialized components needed for certain SLAW treatment options could become less available or more expensive.
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From page 15... ...
As to other features that would help with compliance assessments and other analyses of SLAW treatment alternatives and their implementation, the committee notes that the FFRDC has not specified comparable alternatives (starting with the same feed vector, accounting for all effluents and wastes and including pre-treatment) that will be analyzed from the numerous options identified in various parts of their draft report.
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From page 16... ...
Review of the Analysis of Treatment Approaches of Low-Activity Waste at the Hanford Nuclear Reservation Finally, in this chapter, the committee suggests that the FFRDC's analysis report define the flowsheets that would be compared from the waste receipt tank showing the steps of blending, conditioning, treatment, transportation, and disposal. Also, the committee would like to know the material balances for the key radionuclides in each flowsheet.
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