Performance Assessment in Support of the 1996 Compliance Certification Application for the Waste Isolation Pilot Plant

The conceptual and computational structure of a performance assessment (PA) for the Waste Isolation Pilot Plant (WIPP) is described. Important parts of this structure are (1) maintenance of a separation between stochastic (i.e., aleatory) and subjective (i.e., epistemic) uncertainty, with stochastic uncertainty arising from the many possible disruptions that could occur over the 10,000-year regulatory period that applies to the WIPP, and subjective uncertainty arising from the imprecision with which many of the quantities required in the analysis are known, (2) use of Latin hypercube sampling to incorporate the effects of subjective uncertainty, (3) use of Monte Carlo (i.e., random) sampling to incorporate the effects of stochastic uncertainty, and (4) efficient use of the necessarily limited number of mechanistic calculations that can be performed to support the analysis. The WIPP is under development by the U.S. Department of Energy (DOE) for the geologic (i.e., deep underground) disposal of transuranic (TRU) waste, with the indicated PA supporting a Compliance Certification Application (CCA) by the DOE to the U.S. Environmental Protection Agency (EPA) in October 1996 for the necessary certifications for the WIPP to begin operation. The EPA certified the WIPP for the disposal of TRU waste in May 1998, with the result that the WIPP will be the first operational facility in the United States for the geologic disposal of radioactive waste.

[1]  O. Bunke.  Feller, F.: An Introduction to Probability Theory and its Applications, Vol. II, John Wiley & Sons, Inc., New York‐London‐Sydney, 1966. XVIII + 626 S., 3 Abb., 2 Tab., Preis $ 12,00 , 1969 .

[2]  J. C. Helton,et al.  An Investigation of Uncertainty and Sensitivity Analysis Techniques for Computer Models , 1988 .

[3]  John D. Graham,et al.  Going beyond the single number: Using probabilistic risk assessment to improve risk management , 1996 .

[4]  Jon C. Helton,et al.  Guest editorial: treatment of aleatory and epistemic uncertainty in performance assessments for complex systems , 1996 .

[5]  Jon C. Helton,et al.  Probability, conditional probability and complementary cumulative distribution functions in performance assessment for radioactive waste disposal , 1996 .

[6]  C. M. Stone,et al.  SANTOS - a two-dimensional finite element program for the quasistatic, large deformation, inelastic response of solids , 1997 .

[7]  Jon C. Helton,et al.  Calculation of reactor accident safety goals , 1993 .

[8]  R. L. Hunter,et al.  Systems analysis, long-term radionuclide transport, and dose assessments, Waste Isolation Pilot Plant (WIPP), southeastern New Mexico; March 1989 , 1989 .

[9]  D. R. Anderson,et al.  Deep geologic disposal in the United States: The Waste Isolation Pilot Plant and Yucca Mountain projects , 1991 .

[10]  Jon C. Helton,et al.  Stochastic and Subjective Uncertainty in the Assessment of Radiation Exposure at the Waste Isolation Pilot Plant , 1998 .

[11]  M. G. Marietta,et al.  Uncertainty and sensitivity analysis results obtained in the 1992 performance assessment for the waste isolation pilot plant , 1996 .

[12]  M. D. McKay,et al.  A comparison of three methods for selecting values of input variables in the analysis of output from a computer code , 2000 .

[13]  Jon C. Helton,et al.  Performance Assessment for the Waste Isolation Pilot Plant: From Regulation to Calculation for 40 CFR 191.13 , 1997, Oper. Res..

[14]  G. Yadigaroglu,et al.  On Farmer's line, probability density functions, and overall risk , 1986 .

[15]  M. Elisabeth Paté-Cornell,et al.  Uncertainties in risk analysis: Six levels of treatment , 1996 .

[16]  Jon C. Helton,et al.  Sensitivity analysis techniques and results for performance assessment at the Waste Isolation Pilot Plant , 1991 .

[17]  M. G. Marietta,et al.  Draft forecast of the final report for the comparison to 40 CFR Part 191, Subpart B, for the Waste Isolation Pilot Plant , 1989 .

[18]  J. W. Berglund,et al.  Mechanisms governing the direct removal of wastes from the Waste Isolation Pilot Plant repository caused by exploratory drilling , 1992 .

[19]  S. Kaplan,et al.  On The Quantitative Definition of Risk , 1981 .

[20]  Jon C. Helton,et al.  Robustness of an uncertainty and sensitivity analysis of early exposure results with the MACCS reactor accident consequence model , 1995 .

[21]  C. M. Stone.  Final disposal room structural response calculations , 1997 .

[22]  J C Helton,et al.  A Monte Carlo procedure for the construction of complementary cumulative distribution functions for comparison with the EPA release limits for radioactive waste disposal. , 1995, Risk analysis : an official publication of the Society for Risk Analysis.

[23]  Jon C. Helton,et al.  Comments on an evaluation of the 1992 performance assessment for the Waste Isolation Pilot Plant , 1997 .

[24]  J. W. Garner,et al.  Uncertainty and sensitivity analysis results obtained in a preliminary performance assessment for the Waste Isolation Pilot Plant , 1993 .

[25]  P. J. Roache.  The SECO suite of codes for site Performance Assessment , 1993 .

[26]  M. G. Marietta,et al.  Effect of alternative conceptual models in a preliminary performance assessment for the waste isolation pilot plant , 1995 .

[27]  A. Lavenue,et al.  A modeling approach to address spatial variability within the Culebra Dolomite transmissivity field , 1992 .

[28]  D. C. Cox,et al.  Limit lines for risk , 1982 .

[29]  F. O. Hoffman,et al.  Propagation of uncertainty in risk assessments: the need to distinguish between uncertainty due to lack of knowledge and uncertainty due to variability. , 1994, Risk analysis : an official publication of the Society for Risk Analysis.

[30]  Jon C. Helton,et al.  Treatment of Uncertainty in Performance Assessments for Complex Systems , 1994 .

[31]  J. C. Helton,et al.  Uncertainty and sensitivity analysis in performance assessment for the Waste Isolation Pilot Plant , 1999 .

[32]  W. D. Weart.  WIPP: A Bedded Salt Repository for Defense Radioactive Waste in Southeastern New Mexico , 1979 .

[33]  Ronald L. Iman,et al.  The Repeatability of Uncertainty and Sensitivity Analyses for Complex Probabilistic Risk Assessments , 1991 .

[34]  Jon C. Helton.  Computational structure of a performance assessment involving stochastic and subjective uncertainty , 1996, Winter Simulation Conference.

[35]  W. D. Weart,et al.  Geological characterization report: Waste Isolation Pilot Plant (WIPP) site, southeastern New Mexico , 1978 .

[36]  R. Iman,et al.  Rank correlation plots for use with correlated input variables , 1982 .

[37]  F. Farmer.  REACTOR SAFETY AND SITING: A PROPOSED RISK CRITERION. , 1967 .

[38]  J. C. Helton,et al.  Uncertainty and sensitivity analysis in the presence of stochastic and subjective uncertainty , 1997 .

[39]  Jon C. Helton,et al.  Uncertainty and sensitivity analysis techniques for use in performance assessment for radioactive waste disposal , 1993 .

[40]  T. W. Thompson,et al.  Description and evaluation of a mechanistically based conceptual model for spall , 1997 .

[41]  R. P. Rechard,et al.  An introduction to the mechanics of performance assessment using examples of calculations done for the Waste Isolation Pilot Plant between 1990 and 1992 , 1995 .

[42]  William Feller,et al.  An Introduction to Probability Theory and Its Applications , 1951 .

[43]  R. Iman,et al.  A distribution-free approach to inducing rank correlation among input variables , 1982 .

[44]  P. A. P. Moran,et al.  An introduction to probability theory , 1968 .

[45]  Jon C. Helton,et al.  Risk, Uncertainty in Risk, and the EPA Release Limits for Radioactive Waste Disposal , 1993 .

[46]  M. G. Marietta,et al.  Preliminary comparison with 40 CFR Part 191, Subpart B for the Waste Isolation Pilot Plant, December 1990 , 1990 .

[47]  R. L. Bradshaw,et al.  PROJECT SALT VAULT: A DEMONSTRATION OF THE DISPOSAL OF HIGH-ACTIVITY SOLIDIFIED WASTES IN UNDERGROUND SALT MINES. , 1971 .