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Title: Updated Covariance Processing Capabilities in the AMPX Code System

Abstract

A concerted effort is in progress within the nuclear data community to provide new cross-section covariance data evaluations to support sensitivity/uncertainty analyses of fissionable systems. The objective of this work is to update processing capabilities of the AMPX library to process the latest Evaluated Nuclear Data File (ENDF)/B formats to generate covariance data libraries for radiation transport software such as SCALE. The module PUFF-IV was updated to allow processing of new ENDF covariance formats in the resolved resonance region. In the resolved resonance region, covariance matrices are given in terms of resonance parameters, which need to be processed into covariance matrices with respect to the group-averaged cross-section data. The parameter covariance matrix can be quite large if the evaluation has many resonances. The PUFF-IV code has recently been used to process an evaluation of 235U, which was prepared in collaboration between Oak Ridge National Laboratory and Los Alamos National Laboratory.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1026705
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: he Eighth International Topical Meeting on Nuclear Applications and Utilization of Accelerators, Pocatello, ID, USA, 20070730, 20070802
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CROSS SECTIONS; DATA COVARIANCES; EVALUATION; LANL; MATRICES; NUCLEAR DATA COLLECTIONS; ORNL; PROCESSING; RADIATION TRANSPORT; RESONANCE; PUFF-IV

Citation Formats

Wiarda, Dorothea, and Dunn, Michael E. Updated Covariance Processing Capabilities in the AMPX Code System. United States: N. p., 2007. Web.
Wiarda, Dorothea, & Dunn, Michael E. Updated Covariance Processing Capabilities in the AMPX Code System. United States.
Wiarda, Dorothea, and Dunn, Michael E. Mon . "Updated Covariance Processing Capabilities in the AMPX Code System". United States. doi:.
@article{osti_1026705,
title = {Updated Covariance Processing Capabilities in the AMPX Code System},
author = {Wiarda, Dorothea and Dunn, Michael E},
abstractNote = {A concerted effort is in progress within the nuclear data community to provide new cross-section covariance data evaluations to support sensitivity/uncertainty analyses of fissionable systems. The objective of this work is to update processing capabilities of the AMPX library to process the latest Evaluated Nuclear Data File (ENDF)/B formats to generate covariance data libraries for radiation transport software such as SCALE. The module PUFF-IV was updated to allow processing of new ENDF covariance formats in the resolved resonance region. In the resolved resonance region, covariance matrices are given in terms of resonance parameters, which need to be processed into covariance matrices with respect to the group-averaged cross-section data. The parameter covariance matrix can be quite large if the evaluation has many resonances. The PUFF-IV code has recently been used to process an evaluation of 235U, which was prepared in collaboration between Oak Ridge National Laboratory and Los Alamos National Laboratory.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
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