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Title: Impact of MCNP Unresolved Resonance Probability-Table Treatment on Uranium and Plutonium Benchmarks

A probability-table treatment recently has been incorporated into an intermediate version of the MCNP Monte Carlo code named MCNP4XS. This paper presents MCNP4XS results for a variety of uranium and plutonium criticality benchmarks, calculated with and without the probability-table treatment. It is shown that the probability-table treatment can produce small but significant reactivity changes for plutonium and {sup 233}U systems with intermediate spectra. More importantly, it can produce substantial reactivity increases for systems with large amounts of {sup 238}U and intermediate spectra.
Authors:
;
Publication Date:
OSTI Identifier:
761232
Report Number(s):
LA-UR-99-2300
TRN: US0100591
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Sixth International Conference on Nuclear Criticality Safety (ICNC '99), Versailles (FR), 09/20/1999--09/24/1999; Other Information: PBD: 20 Sep 1999
Research Org:
Los Alamos National Lab., NM (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BENCHMARKS; CRITICALITY; PLUTONIUM; RESONANCE; SAFETY; SPECTRA; URANIUM