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          NRC Library  Document Collections  NUREG-Series Publications  Publications Prepared by NRC ContractorsPUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices (NUREG/CR-6650)

On this page: Publication Information AbstractDownload complete document NUREG/CR-6650 (PDF - 3.99 MB)Publication Information **Manuscript Completed:** April 2000**Date Published:** June 2000 **Prepared by:** M. E. Dunn Oak Ridge National Laboratory Managed by UT-Battelle, LLC Oak Ridge, TN 37831-6370 D. D. Ebert, NRC Project Manager **Prepared for:** Division of Systems Analysis and Regulatory Effectiveness Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission****Washington, DC 20555-0001 NRC Job Code W6479 Availability Notice Abstract PUFF-III is an extension of the previous PUFF-Il 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-ill 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 fides without visually inspecting the ENDF data. Following the correlation matrix calculation, PUFF-rn also evaluates the eigenvalues of each correlation matrix and tests each matrix for positive definiteness. Additional new features are discussed in the manual. PUFF-Ill has been developed for implementation in the AMPX code system, and several modifications were incorporated to improve memory allocation tasks and input/output (I/O) 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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