Progress on Nuclear Data Covariances: AFCI-1.2 Covariance Library

Oblozinsky,P. ; Oblozinsky,P. ; Mattoon,C.M. ; Herman,M. ; Mughabghab,S.F. ; Pigni,M.T. ; Talou,P. ; Hale,G.M. ; Kahler,A.C. ; Kawano,T. ; Little,R.C. ; Young,P.G

关键词: ACTINIDES;    BUILDING MATERIALS;    COOLANTS;    CROSS SECTIONS;    DATA COVARIANCES;    EVALUATION;    FISSION PRODUCTS;    FISSION SPECTRA;    LANL;    LIGHT NUCLEI;    MODERATORS;    NEUTRONS;    PROMPT NEUTRONS;    R MATRIX;    TESTING;   

DOI  :  10.2172/972322
RP-ID  :  BNL--90897-2009
PID  :  OSTI ID: 972322
Others  :  R&D Project: EST-003-NEFA
Others  :  Other: KB0301041
Others  :  TRN: US1001501

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Improved neutron cross section covariances were produced for 110 materials including 12 light nuclei (coolants and moderators), 78 structural materials and fission products, and 20 actinides. Improved covariances were organized into AFCI-1.2 covariance library in 33-energy groups, from 10{sup -5} eV to 19.6 MeV. BNL contributed improved covariance data for the following materials: {sup 23}Na and {sup 55}Mn where more detailed evaluation was done; improvements in major structural materials {sup 52}Cr, {sup 56}Fe and {sup 58}Ni; improved estimates for remaining structural materials and fission products; improved covariances for 14 minor actinides, and estimates of mubar covariances for {sup 23}Na and {sup 56}Fe. LANL contributed improved covariance data for {sup 235}U and {sup 239}Pu including prompt neutron fission spectra and completely new evaluation for {sup 240}Pu. New R-matrix evaluation for {sup 16}O including mubar covariances is under completion. BNL assembled the library and performed basic testing using improved procedures including inspection of uncertainty and correlation plots for each material. The AFCI-1.2 library was released to ANL and INL in August 2009.