INDC(IND)-35G - IAEA Nuclear Data Services
INDC(IND)-35G - IAEA Nuclear Data Services
INDC(IND)-35G - IAEA Nuclear Data Services
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A Critical Assessment of Multiy;.TOUp <strong>Nuclear</strong> <strong>Data</strong> for<br />
Structural Elements<br />
(S.Ganesan, M.M.Ramanadhan, V.Gopalakrishnan and R.S.<br />
Keshavamurthy)<br />
Our calculated values of central worths of structural<br />
materials using the non-adjusted, ENDF/B-TV based, 1983 HRC<br />
set and those using the 1969 adjusted French multigroup set<br />
showed discrepancies ranging from + 20 to + 60$ in comparison<br />
with experimental values in our 1 ' 2 analyses of selected fast<br />
critical assemblies viz. ZPR-6-7, ZPR-9-31, ZPR-3-48 and<br />
ZPR-3-56B. The Kgff of tho last assembly which has nickel<br />
reflector showed an overprediction of 1.63$ when calculated<br />
using the French set. One clear conclusion of the present<br />
investigation is that the capture cross sections for Fe, Cr<br />
and Ni in French set at HRC are definitely outdated and<br />
incorrect. The modified French set in which the multigroup<br />
sets for Fe, Cr and Ni alone were replaced in full by RRC<br />
set gives a Keff close to unity.<br />
Further, the currently reported discrepancies in<br />
resonance parameters and measured cross sections in structural<br />
elements are also being surveyed to identify problem areas<br />
which need further attention*<br />
1. S.Ganesan, M.M.Ramanadhan and V.Gopalakrishnan, 'Analysis<br />
of ZPR-9 Assembly 31, the Advanced Fuels Program Carbide<br />
Benchmark Assembly', RRC-61 (1983).<br />
2. S.Ganesanet al., (unpublished work) 1983.<br />
3. ENDF-202 Cross Section Evaluation Working Group Benchmark<br />
Specifications, BNL 19302, Nov.1974» see also updates and<br />
clarifications, from Philip M. Rose BNL, USA addressed to<br />
S.Ganesan (May 1983).<br />
ht J.L.Rowlands,et al., 'Convergence of Integral and Differen-<br />
tial Croas Section <strong>Data</strong> for Structural Materials' Nucl.ar<br />
<strong>Data</strong> for Science and Techn4o«y p.85 (1983). D. Reid.l<br />
Publishing Company.