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Resolved resonance region evaluations of n+ 206,207,208Pb for fast spectrum applications

Journal Article · · Annals of Nuclear Energy
 [1];  [2];  [3];  [4];  [4];  [4];  [5]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States); Edgewater Federal Service
  2. Rensselaer Polytechnic Inst., Troy, NY (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Naval Nuclear Laboratory, Niskayuna, NY (United States)
  5. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

Resolved resonance region evaluations of the major isotopes of natural lead, 206Pb, 207Pb, 208Pb, have been performed to support the development of Generation IV reactors. Validation of nuclear data for lead fast reactors was performed with simulations of shielding benchmarks, integral critical benchmarks, and quasi-differential scattering measurements. Sensitivity analyses of these systems showed that elastic scattering reactions above 100 keV were the dominant reactions driving system performance. The resolved resonance regions (RRRs) of the lead isotopes extend past 100 keV, making the RRR an ideal starting point to evaluate lead cross sections. Since the R-matrix requires knowledge of bound, distant, and observed resonances, it was necessary to evaluate from 10-5 up to the respective limit of the RRR. The 208Pb RRR evaluation was extended to 1.5 MeV in order to obtain resonance parameters used to calculate new elastic scattering angular distributions up to 1.5 MeV. Resonance parameter uncertainties and covariance were generated using the R-matrix code SAMMY. In conclusion, the new RRR parameters show a direct improvement to the scattering kernel below 1.5 MeV which in turn greatly improves fast critical experiments over ENDF/B-VIII.0.

Research Organization:
Rensselaer Polytechnic Inst., Troy, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
DOE Contract Number:
89233018CNR000004; 89233218CNA000001; SC0012704
OSTI ID:
2377688
Journal Information:
Annals of Nuclear Energy, Journal Name: Annals of Nuclear Energy Vol. 202; ISSN 0306-4549
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Nuclear Criticality Safety Program (NCSP)