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Tank Waste Retrieval, Processing, and On-site Disposal at Three Department of Energy Sites Final Report (2006) / Chapter Skim
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Appendix I Performance Assessment Process
Pages 186-189

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From page 186...
... However, no amount of parametric examination ance with even the definite performance objectives involves compensates for an inaccurate conceptual model. scientific judgment and regulatory policy decisions that are An National Research Council (2000f)
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From page 187...
... panel that described the processes through which assessment, these mathematical models must be able to conceptual models of flow and transport in the fractured reconstruct or predict variations of quantities such as convadose zone are developed, concluded that the development centrations of a contaminant in air, surface water, or groundof the conceptual model is the most important part of the water in both space and time. Computer codes have been modeling process.1 developed to calculate results from the governing equations using analytic (exact)
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From page 188...
... models, even models of nuclear waste facilities, the more If compliance with the performance objective requires pro- confidence we will have in the analysis (and the models, jection of environmental impacts extending thousands of including performance assessment) ." He argues that proyears into the future, a good analyst will establish whether longed periods of site monitoring, perhaps as long as 300 to the cumulative errors produced by a model yield meaningful 1,000 years, are required to update codes to calibrate models results.
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From page 189...
... In performance assessment, the basis for selection of compliaddition to updating the conceptual model, well-designed ance points is also clearly described. Review of a perforand well-thought-out monitoring systems could provide data mance assessment is easier to complete if the most recent to improve the numerical model.
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Key Terms

  • radioactive waste
  • performance objectives
  • site characterization
  • extent practical
  • nuclear waste

  • performance assessment
  • performance objective
  • disposal facility
  • environmental impact
  • reasonably achievable

  • vadose zone
  • research council
  • national research


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