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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The Program 'REX1 for Accurate Generation of Multigroup Infinite<br />
Dilution Cross Sections. Elastic and Inelastic Transfer Matrices<br />
and the Program 'RBX2* for Accurate Calculation of Self Shielding<br />
Factors in the Resolved Resonance Region for Fast Reactor Applications<br />
(V.Gopalakrishnan and S.Ganesan)<br />
1 2<br />
The computer programs REX1 and REX2 are two parts of<br />
RAMBHA , a nuclear data processing code system for fast reactor<br />
applications, developed at RRC to obtain multigroup cross<br />
u<br />
section data using the basio library in the ENDF/B-TV format.<br />
REX1: This program is intended for multigrouping point data<br />
available in the ENDF/B-IV format* The program expects the<br />
cross sections to be directly specified as point data without<br />
parameterization through resonance formalisms. If the actual<br />
cross sections are represented by a combination of resonance<br />
parameters and floor corrections in some energy region and as<br />
point data in other energy regions, then, one has to use the<br />
preprocessing codes LINEAR -RECENT before using REX1 for multigrouping.<br />
In addition to group cross sections, the program<br />
calculates the multigroup transfer matrices for elastic<br />
scattering by Bucholz' method and the multigroup transfer<br />
matrices for inelastic scattering by the method followed in<br />
MIGROS-3 8 .<br />
The program follows any interpolation scheme specified<br />
according to ENDF/B-XV conventions and uses Gauss' quadrature<br />
whenever numerical integrations are needed. Standard fast<br />
reactor flux spectra expressed in a functional form in various<br />
energy regions are utilised for weighting.<br />
REX2: The resolved resonance has been extended considerably<br />
for many isotopes of interest in reactor design by means of high<br />
resolution cross section measurements. The improved quality of<br />
data in the resonance region hes called for faithful multi-