Advances in fast reactor sensitivity and uncertainty analysis
A review of present methods and existing computer codes indicates an enormous capability not only to calculate sensitivity coefficients but also to apply them to a variety of purposes. However, there are still many limitations to our present capabilities. One of these limitations has been our inability to include in a complete and systematic way the effect of methods uncertainties on the determination of adjusted data, which depends, in general, not only on experimental measurements, but also on estimates of covariances associated with the measurements and the methods. Also, the uncertainty in adjusted data contains contributions from uncertainties in covariance estimates which contributions we have heretofore neglected. A new and comprehensive approach to include effects of methods uncertainties is presented here, and all sources which contribute to the uncertainty of the adjusted data are considered. This new approach is demonstrated using rough estimates for the methods uncertainties as applied to a simplified representation of the ZPR-6/7 fast benchmark. The results indicate that it may be essential to include methods uncertainties if integral experiments are to be used for the creation of adjusted nuclear data libraries. A careful evaluation of methods bias and uncertainties must still be performed.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6518555
- Report Number(s):
- CONF-780858-7; TRN: 79-002831
- Resource Relation:
- Conference: Workshop on theory and application of sensitivity and uncertainty analysis, Oak Ridge, TN, USA, 22 Aug 1978
- Country of Publication:
- United States
- Language:
- English
Similar Records
Application of sensitivity and uncertainty methodology to fast reactor integral experiment analysis
Practical application of uncertainty-based validation assessment