The impact of 238U resonance elastic scattering approximations on thermal reactor Doppler reactivity

Lee, Deokjung; Smith, Kord; Rhodes, Joel

doi:10.1016/j.anucene.2008.11.026

Cited by 67 publications

(31 citation statements)

References 1 publication

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“…Recent studies have, however, reported that the conventional scattering models used for heavy nuclide resonance scattering yield a significant impact on calculations of the Doppler reactivity worth (Dagan and Boreders, 2006;Lee, 2009;Dagan, 2011). Although this cause was pointed out by Ouisloumen more than 20 years ago (Ouisloumen and Sanchez, 1991), the recent development of the exact resonance scattering model facilitates the implementation into production Monte Carlo codes.…”

Section: New Resonance Elastic Scattering Modelmentioning

confidence: 94%

Recent developments of JAEA’s Monte Carlo code MVP for reactor physics applications

Nagaya

Okumura

Mori

2015

Annals of Nuclear Energy

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Section: New Resonance Elastic Scattering Modelmentioning

confidence: 94%

Recent developments of JAEA’s Monte Carlo code MVP for reactor physics applications

Nagaya

Okumura

Mori

2015

Annals of Nuclear Energy

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“…In order to avoid the constant cross section approximation, Doppler broadened rejection correction (DBRC), which introduced an additional rejection scheme, was implemented by Becker et al (2009). The other methods such as weight-reduction techniques (Lee et al, 2009;Mori and Nagaya, 2009;Bouland et al, 1994) have also been proposed to treat this problem. DBRC was used in this paper.…”

Section: Doppler-broadening Rejection Correction (Dbrc)mentioning

confidence: 98%

Development of on-the-fly temperature-dependent cross-sections treatment in RMC code

Liu

Yuan

Yu³

et al. 2016

Annals of Nuclear Energy

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“…This reduction has been shown to artificially increase k eff results by ∼200 pcm for LWR configurations. Even greater errors are observed in simulations of high-temperature reactor systems [9].…”

Section: Asymptotic Modelmentioning

confidence: 99%

“…The weight correction method (WCM) is another stochastic procedure for exactly treating resonance scattering [9] [22]. In the WCM algorithm, µ and v t values are independently sampled, just as in the CXS algorithm.…”

Section: Weight Correction Methodsmentioning

confidence: 99%

Accelerated sampling of the free gas resonance elastic scattering kernel

Walsh

Forget

Smith

2014

Annals of Nuclear Energy

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In this work, we present the derivation and investigation of a new Doppler broadening rejection sampling approach for the exact treatment of resonance elastic scattering in Monte Carlo neutron transport codes. Implemented in OpenMC, this method correctly accounts for the energy dependence of cross sections when treating the thermal motion of target nuclei in elastic scattering events. The method is verified against both stochastic and deterministic reference results in the literature for 238 U resonance scattering. Upscatter percentages and mean scattered energies calculated with the method are shown to agree well with the reference scattering kernel results. Additionally, pin cell and full core k eff results calculated with this implementation of the exact resonance scattering kernel are shown to be in close agreement with those in the literature. The attractiveness of the method stems from its improvement upon a computationally expensive rejection sampling procedure employed by an earlier stochastic resonance scattering treatment. With no loss in accuracy, the accelerated resonant target velocity sampling algorithm is shown to reduce overall runtime by 3-5% relative to the Doppler broadening rejection correction method for both pin cell and full core benchmark problems. This translates to a 30-40% reduction in runtime overhead.

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The impact of 238U resonance elastic scattering approximations on thermal reactor Doppler reactivity

Cited by 67 publications

References 1 publication

Recent developments of JAEA’s Monte Carlo code MVP for reactor physics applications

Recent developments of JAEA’s Monte Carlo code MVP for reactor physics applications

Development of on-the-fly temperature-dependent cross-sections treatment in RMC code

Accelerated sampling of the free gas resonance elastic scattering kernel

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