SENSIT: a cross-section and design sensitivity and uncertainty analysis code. [For CDC 7600]
SENSIT computes the sensitivity and uncertainty of a calculated integral response (such as a dose rate) due to input cross sections and their uncertainties. Sensitivity profiles are computed for neutron and gamma-ray reaction cross sections (of standard multigroup cross-section sets) and for secondary energy distributions (SED's) of multigroup scattering matrices. In the design sensitivity mode, SENSIT computes changes in an integral response due to design changes and gives the appropriate sensitivity coefficients. Cross-section uncertainty analyses are performed for three types of input data uncertainties: cross-section covariance matrices for pairs of multigroup reaction cross sections, spectral shape uncertainty parameters for secondary energy distributions (integral SED uncertainties), and covariance matrices for energy-dependent response functions. For all three types of data uncertainties, SENSIT computes the resulting variance and expected standard deviation in an integral response of interest, on the basis of generalized perturbation theory. SENSIT uses angular-flux files from one-dimensional discrete-ordinates codes like ONETRAN, ANISN, and DTF, and reads multigroup cross-section sets in three different formats. This report gives detailed input specifications; precise definitions of all input and output arrays; a discussion of the underlying theory; and details of program flow, data management, and storage requirements. Eight sample problems are described in detail for which complete input files and selected output prints are listed. 4 figures, 3 tables.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5117555
- Report Number(s):
- LA-8498-MS; TRN: 80-017549
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPUTER CODES
S CODES
RADIATION TRANSPORT
SENSITIVITY ANALYSIS
TRANSPORT THEORY
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CROSS SECTIONS
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DOSE RATES
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