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Title: Evaluation of Cross-Section Sensitivities in Computing Burnup Credit Fission Product Concentrations

Abstract

U.S. Nuclear Regulatory Commission Interim Staff Guidance 8 (ISG-8) for burnup credit covers actinides only, a position based primarily on the lack of definitive critical experiments and adequate radiochemical assay data that can be used to quantify the uncertainty associated with fission product credit. The accuracy of fission product neutron cross sections is paramount to the accuracy of criticality analyses that credit fission products in two respects: (1) the microscopic cross sections determine the reactivity worth of the fission products in spent fuel and (2) the cross sections determine the reaction rates during irradiation and thus influence the accuracy of predicted final concentrations of the fission products in the spent fuel. This report evaluates and quantifies the importance of the fission product cross sections in predicting concentrations of fission products proposed for use in burnup credit. The study includes an assessment of the major fission products in burnup credit and their production precursors. Finally, the cross-section importances, or sensitivities, are combined with the importance of each major fission product to the system eigenvalue (k{sub eff}) to determine the net importance of cross sections to k{sub eff}. The importances established the following fission products, listed in descending order of priority, thatmore » are most likely to benefit burnup credit when their cross-section uncertainties are reduced: {sup 151}Sm, {sup 103}Rh, {sup 155}Eu, {sup 150}Sm, {sup 152}Sm, {sup 153}Eu, {sup 154}Eu, and {sup 143}Nd.« less

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
885988
Report Number(s):
ORNL/TM-2005/48
TRN: US0604128
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ACCURACY; ACTINIDES; BURNUP; CRITICALITY; CROSS SECTIONS; EIGENVALUES; EVALUATION; FISSION PRODUCTS; IRRADIATION; NEUTRONS; PRODUCTION; REACTION KINETICS; REACTIVITY WORTHS; SPENT FUELS

Citation Formats

Gauld, I.C. Evaluation of Cross-Section Sensitivities in Computing Burnup Credit Fission Product Concentrations. United States: N. p., 2005. Web. doi:10.2172/885988.
Gauld, I.C. Evaluation of Cross-Section Sensitivities in Computing Burnup Credit Fission Product Concentrations. United States. doi:10.2172/885988.
Gauld, I.C. Fri . "Evaluation of Cross-Section Sensitivities in Computing Burnup Credit Fission Product Concentrations". United States. doi:10.2172/885988. https://www.osti.gov/servlets/purl/885988.
@article{osti_885988,
title = {Evaluation of Cross-Section Sensitivities in Computing Burnup Credit Fission Product Concentrations},
author = {Gauld, I.C.},
abstractNote = {U.S. Nuclear Regulatory Commission Interim Staff Guidance 8 (ISG-8) for burnup credit covers actinides only, a position based primarily on the lack of definitive critical experiments and adequate radiochemical assay data that can be used to quantify the uncertainty associated with fission product credit. The accuracy of fission product neutron cross sections is paramount to the accuracy of criticality analyses that credit fission products in two respects: (1) the microscopic cross sections determine the reactivity worth of the fission products in spent fuel and (2) the cross sections determine the reaction rates during irradiation and thus influence the accuracy of predicted final concentrations of the fission products in the spent fuel. This report evaluates and quantifies the importance of the fission product cross sections in predicting concentrations of fission products proposed for use in burnup credit. The study includes an assessment of the major fission products in burnup credit and their production precursors. Finally, the cross-section importances, or sensitivities, are combined with the importance of each major fission product to the system eigenvalue (k{sub eff}) to determine the net importance of cross sections to k{sub eff}. The importances established the following fission products, listed in descending order of priority, that are most likely to benefit burnup credit when their cross-section uncertainties are reduced: {sup 151}Sm, {sup 103}Rh, {sup 155}Eu, {sup 150}Sm, {sup 152}Sm, {sup 153}Eu, {sup 154}Eu, and {sup 143}Nd.},
doi = {10.2172/885988},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Aug 12 00:00:00 EDT 2005},
month = {Fri Aug 12 00:00:00 EDT 2005}
}

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