Improvement of Monte Carlo Lattice Burnup Calculation Performance with the Correlated Sampling Method

Moriwaki, Masanao; Aoyama, Motoo

doi:10.1080/18811248.2002.9715238

Cited by 5 publications

(11 citation statements)

References 3 publications

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“…8) In Eq. (2), t and * t are the total macroscopic cross section and the effective total macroscopic cross section, respectively, with three-dimensional position r i and energy E i .…”

Section: Acs Methods 8)mentioning

confidence: 99%

“…In these equations, F * i represents the neutron weight adjustment when using pseudo-scattering and it is technically performed based on the following two stages: 8) The first stage is the weight adjustment due to the real-or-non-real-scattering (scattering or absorption+pseudo-scattering) sampling, which is performed as…”

Section: Acs Methods 8)mentioning

confidence: 99%

“…8) What ties these assemblies is fuel compositions obtained by depletion analysis, and there is no neutronic connection among them. For the multi-assembly calculation, the difference lies in that they are arranged spatially and connected neutronically.…”

Section: Definition Of Neutron Collision History For Multiassembly Prmentioning

confidence: 99%

“…In the previous paper, 8) one neutron collision history was defined as the collision records that a set of neutrons experienced from their generation to termination. In other words, the neutron collision history is a collection of the collision data on neutron paths.…”

Section: Definition Of Neutron Collision History For Multiassembly Prmentioning

confidence: 99%

“…The Advanced Correlated Sampling (ACS) method 8) has been developed to speed up the MC calculation. The ACS method utilizes the correlated sampling method, 9) which is an MC method that uses a perturbation technique, and a pseudo scattering technique, 6,7) and gives the following advantages besides high efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Assembly Analysis with an Advanced Correlated Sampling Method

Moriwaki

2003

Journal of Nuclear Science and Technology

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The Advanced Correlated Sampling (ACS) method, which can greatly enhance the calculation efficiency of Monte Carlo (MC) methods using a perturbation technique and a pseudo-scattering technique, is improved so as to be able to handle multi-assembly analysis. Two boundary connection methods-the neutron path connection and neutron current connection methods-are developed, and their accuracies for a 2×2 multi-assembly system are confirmed. The speedup factor against the corresponding direct MC calculation is a maximum of about 100. These boundary connection methods are also applied in pin-wise 2-D quarter core calculations as an example of a large-scale system. A newly developed perturbed neutron source iteration technique allows for very smooth source convergence. Furthermore, by incorporating the Direct Response Matrix (DRM) method as the acceleration means for the source convergence, the number of source iteration cycles is significantly shortened. The results confirm that this improved ACS method has the ability to perform pin-wise whole core calculations very accurately and efficiently.

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“…8) In Eq. (2), t and * t are the total macroscopic cross section and the effective total macroscopic cross section, respectively, with three-dimensional position r i and energy E i .…”

Section: Acs Methods 8)mentioning

confidence: 99%

Section: Acs Methods 8)mentioning

confidence: 99%

Section: Definition Of Neutron Collision History For Multiassembly Prmentioning

confidence: 99%

Section: Definition Of Neutron Collision History For Multiassembly Prmentioning

confidence: 99%