Determination of probability density functions for parameters in the Munson-Dawson model for creep behavior of salt
- RE/SPEC, Inc., Rapid City, SD (United States)
- Sandia National Labs., Albuquerque, NM (United States)
The modified Munson-Dawson (M-D) constitutive model that describes the creep behavior of salt will be used in performance assessment calculations to assess compliance of the Waste Isolation Pilot Plant (WIPP) facility with requirements governing the disposal of nuclear waste. One of these standards requires that the uncertainty of future states of the system, material model parameters, and data be addressed in the performance assessment models. This paper presents a method in which measurement uncertainty and the inherent variability of the material are characterized by treating the M-D model parameters as random variables. The random variables can be described by appropriate probability distribution functions which then can be used in Monte Carlo or structural reliability analyses. Estimates of three random variables in the M-D model were obtained by fitting a scalar form of the model to triaxial compression creep data generated from tests of WIPP salt. Candidate probability distribution functions for each of the variables were then fitted to the estimates and their relative goodness-of-fit tested using the Kolmogorov-Smirnov statistic. A sophisticated statistical software package obtained from BMDP Statistical Software, Inc. was used in the M-D model fitting. A separate software package, STATGRAPHICS, was used in fitting the candidate probability distribution functions to estimates of the variables. Skewed distributions, i.e., lognormal and Weibull, were found to be appropriate for the random variables analyzed.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10107511
- Report Number(s):
- SAND-90-2366; ON: DE93004481
- Resource Relation:
- Other Information: PBD: Oct 1992
- Country of Publication:
- United States
- Language:
- English
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Determination of probability density functions for parameters in the Munson-Dawson model for creep behavior of salt
Determination of probability density functions for parameters in the Munson-Dawson model for creep behavior of salt
Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
SALT DEPOSITS
CREEP
ALPHA-BEARING WASTES
UNDERGROUND DISPOSAL
WIPP
REGRESSION ANALYSIS
STATISTICAL MODELS
052002
990200
WASTE DISPOSAL AND STORAGE
MATHEMATICS AND COMPUTERS