Evolution in performance assessment modeling as a result of regulatory review
- AECL Chalk River Labs., Ontario (Canada); and others
AECL is planning to build the IRUS (Intrusion Resistant Underground Structure) facility for near-surface disposal of LLRW. The PSAR (preliminary safety assessment report) was subject to an initial regulatory review during mid-1992. The regulatory authority provided comments on many aspects of the safety assessment documentation including a number of questions on specific PA (Performance Assessment) modelling assumptions. As a result of these comments as well as a separate detailed review of the IRUS disposal concept, changes were made to the conceptual and mathematical models. The original disposal concept included a non-sorbing vault backfill, with a strong reliance on the wasteform as a barrier. This concept was altered to decrease reliance on the wasteform by replacing the original backfill with a sand/clinoptilolite mix, which is a better sorber of metal cations. This change lead to changes in the PA models which in turn altered the safety case for the facility. This, and other changes that impacted performance assessment modelling are the subject of this paper.
- Research Organization:
- Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)
- OSTI ID:
- 240887
- Report Number(s):
- CONF-951209-; ON: DE96005882; TRN: 96:013546
- Resource Relation:
- Conference: 17. low-level radioactive waste management conference, Phoenix, AZ (United States), 12-14 Dec 1995; Other Information: PBD: [1995]; Related Information: Is Part Of Proceedings: 17th annual US Department of Energy low-level radioactive waste management conference; Lake, D. [ed.]; PB: 480 p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
RADIOACTIVE WASTE FACILITIES
PERFORMANCE
CONTAINMENT SYSTEMS
LOW-LEVEL RADIOACTIVE WASTES
GROUND DISPOSAL
UNDERGROUND FACILITIES
GROUND WATER
RADIONUCLIDE MIGRATION
RADIOACTIVE WASTE DISPOSAL
PERMEABILITY
CLINOPTILOLITE
MATHEMATICAL MODELS
SAND
BIOINTRUSION