Evaluated Reference Cross Section Library.

Abstract

B. Assumes any liabilities with respect to the us= of, 6r for damages resulting from the use of any information, qpparatus, method, or process disclosed in,ikis report. As used in the above, *person acting on behalf a+ the Commission' includes cany employee or coptractor of the Commission, or employee of such contractor, to the exrent that such employee or contractor ctor 06 the ~ommlssion, or employee of such cantractor prepares, disseminates, ar provides access to,. ~y information pursuant to his employment or contract with the Commission, or his employment with ' such ,contractor.

LMFBR (Liquid Metal Fast Breeder Reactor) Reaction Rate and Dosimetry Quarterly Progress Report June July August 1971

“…(29)(30)(31)(32) Work in progress to improve the accuracy and consistency of these cross sections is discussed.…”

“…Present accuracy is in the 20 to 40% range at the 95% confidence level. (29)(30)(31)(32) This accuracy can be improved if the sources of existing inconsistencies between calculated integral averaged cross section, C1 C ' using the current evaluated energy dependent cross sections o(E) and measured values, om' can be identified and effectively eliminated. (29)(30)(31)(32)(33)(34)(35)(36)(37)44) The last Cross Section Evaluation Working Group (CSEWG) meeting at BNL included a review of the cross section needs of the FRMDC and fuels and HEDL-16 materials programs.…”

“…These needs have been discussed previously. (29)(30)(31)(32) As a result, arrangements were made with the National Neutron Cross Section Center (NNCSC) at BNL to compare the current SAND-II reference evaluated energy-dependent cross secti on 1i brary with exi s ti ng ENDF/8 data. rmcsc now has the SAND-II d(E)' S and will prepare suitable plots for making the necessary comparisons.…”

LMFBR (Liquid Metal Fast Breeder Reactor) Readtion Rate and Dosimetry 3rd Quarterly Progress Report December 1971 January February 1972

“…The foil containment and positioning arrangement were identical to the Fission Chamber NBS (2-2-72) test except that the fission chamber contained two other fi ss i on foil s (23 9'pu and 23 7Np ) .…”

“…Present accuracy is in the 20 to 40% range at the 95% confidence 1evel. (9)(10)(11)(12)(13) This accuracy can be improved if the sources of existing inconsistencies between calculated integral averaged cross sections a c using the current evaluated energy dependent cross sections a(E) and measured values 0 can be identified and effectively eliminated -see the references 1isted m in the previous Quarterly Reports. (1 ,2) 58Ni(n,p)58Co and 54Fe(n,p)54Mn Cross Sections Study of the 58Ni(n,p) and 54Fe(n,p) evaluated energy dependent cross…”