Abstract
Recently, great interest has been generated in using lead as a coolant for fast neutron sys tems and as a result it is important to investigate the ENDF/B-VIII.0 [6] isotopic evaluations that comprise stable le ad. To this end, resonance parameters for 206Pb, 207Pb, and 208Pb were re-evaluated because their resolved reso nance regions extend beyond 0.5 MeV meaning resonance parameters used in reconstructing cross sections and elastic scattering angular distributions impact fast systems. The impact of resonance parameters is demon strated by the differences between the evaluations in predicting experimental results from the fully modeled RPI Quasi-Differential Scattering Experiment[lO] via MCNPv6.2 [12]. In addition , MCNP KCODE calculations of lead-sensitive fast spectra critical benchmarks showed variations of keff on average of 400 pcm, caused solely from differences in elastic scattering angular distributions in 208Pb. Re-evaluation entailed fitting data with the program SAMMY[l8].
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