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Title: PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices

Abstract

PUFF-III is an extension of the previous PUFF-II code that was developed in the 1970s and early 1980s. The PUFF codes process the Evaluated Nuclear Data File (ENDF) covariance data and generate multigroup covariance matrices on a user-specified energy grid structure. Unlike its predecessor, PUFF-III can process the new ENDF/B-VI data formats. In particular, PUFF-III has the capability to process the spontaneous fission covariances for fission neutron multiplicity. With regard to the covariance data in File 33 of the ENDF system, PUFF-III has the capability to process short-range variance formats, as well as the lumped reaction covariance data formats that were introduced in ENDF/B-V. In addition to the new ENDF formats, a new directory feature is now available that allows the user to obtain a detailed directory of the uncertainty information in the data files without visually inspecting the ENDF data. Following the correlation matrix calculation, PUFF-III also evaluates the eigenvalues of each correlation matrix and tests each matrix for positive definiteness. Additional new features are discussed in the manual. PUFF-III has been developed for implementation in the AMPX code system, and several modifications were incorporated to improve memory allocation tasks and input/output operations. Consequently, the resulting code has amore » structure that is similar to other modules in the AMPX code system. With the release of PUFF-III, a new and improved covariance processing code is available to process ENDF covariance formats through Version VI.« less

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
US Nuclear Regulatory Commission (US)
OSTI Identifier:
763143
Report Number(s):
ORNL/TM-1999/235; NUREG/CR-6650
NUREG/CR-6650; TRN: US0004683
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; NUCLEAR DATA COLLECTIONS; DATA COVARIANCES; P CODES; SPONTANEOUS FISSION; MULTIPLICITY; EIGENVALUES; MANUALS

Citation Formats

Dunn, M.E. PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices. United States: N. p., 2000. Web. doi:10.2172/763143.
Dunn, M.E. PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices. United States. doi:10.2172/763143.
Dunn, M.E. Thu . "PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices". United States. doi:10.2172/763143. https://www.osti.gov/servlets/purl/763143.
@article{osti_763143,
title = {PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices},
author = {Dunn, M.E.},
abstractNote = {PUFF-III is an extension of the previous PUFF-II code that was developed in the 1970s and early 1980s. The PUFF codes process the Evaluated Nuclear Data File (ENDF) covariance data and generate multigroup covariance matrices on a user-specified energy grid structure. Unlike its predecessor, PUFF-III can process the new ENDF/B-VI data formats. In particular, PUFF-III has the capability to process the spontaneous fission covariances for fission neutron multiplicity. With regard to the covariance data in File 33 of the ENDF system, PUFF-III has the capability to process short-range variance formats, as well as the lumped reaction covariance data formats that were introduced in ENDF/B-V. In addition to the new ENDF formats, a new directory feature is now available that allows the user to obtain a detailed directory of the uncertainty information in the data files without visually inspecting the ENDF data. Following the correlation matrix calculation, PUFF-III also evaluates the eigenvalues of each correlation matrix and tests each matrix for positive definiteness. Additional new features are discussed in the manual. PUFF-III has been developed for implementation in the AMPX code system, and several modifications were incorporated to improve memory allocation tasks and input/output operations. Consequently, the resulting code has a structure that is similar to other modules in the AMPX code system. With the release of PUFF-III, a new and improved covariance processing code is available to process ENDF covariance formats through Version VI.},
doi = {10.2172/763143},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}