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

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Description

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 ... continued below

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114 pages

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Dunn, M.E. June 1, 2000.

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Description

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.

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114 pages

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INIS; OSTI as DE00763143

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  • Other Information: PBD: 1 Jun 2000

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  • Report No.: ORNL/TM-1999/235
  • Report No.: NUREG/CR-6650
  • Grant Number: AC05-00OR22725
  • DOI: 10.2172/763143 | External Link
  • Office of Scientific & Technical Information Report Number: 763143
  • Archival Resource Key: ark:/67531/metadc717461

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • Jan. 25, 2016, 1:08 p.m.

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Dunn, M.E. PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices, report, June 1, 2000; Tennessee. (digital.library.unt.edu/ark:/67531/metadc717461/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.