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

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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.

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Mosteller, R.D. & Little, R.C. September 20, 1999.

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Description

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.

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Medium: P; Size: vp.

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INIS; OSTI as DE00761232

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  • Sixth International Conference on Nuclear Criticality Safety (ICNC '99), Versailles (FR), 09/20/1999--09/24/1999

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  • Report No.: LA-UR-99-2300
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 761232
  • Archival Resource Key: ark:/67531/metadc720430

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  • September 20, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 25, 2016, 11:07 a.m.

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Mosteller, R.D. & Little, R.C. Impact of MCNP Unresolved Resonance Probability-Table Treatment on Uranium and Plutonium Benchmarks, article, September 20, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc720430/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.