A New Direct Calculation Method of Response Matrices Using a Monte Carlo Calculation.

Moriwaki, Masanao; Ishii, Kazuya; Maruyama, Hiromi; Aoyama, Motoo

doi:10.3327/jnst.36.877

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…In order to make the whole core calculation more practical, efficiency of the source convergence in the ACS calculation should be greatly improved. To this end, the author incorporated core calculations based on the Direct Response Matrix (DRM) method 13) among ACS calculations for acceleration. The DRM method is a response matrix (RM) method.…”

Section: Acceleration With Direct Response Matrix Methodsmentioning

confidence: 99%

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Multi-Assembly Analysis with an Advanced Correlated Sampling Method

Moriwaki

2003

J. Nucl. Sci. Technol.

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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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Section: Acceleration With Direct Response Matrix Methodsmentioning

confidence: 99%

“…In addition, the author addresses its acceleration using the Direct Response Matrix (DRM) method. 13) Although calculations can be performed three dimensionally, these multi-assembly and whole core calculations are limited to a two-dimensional space in the present paper. Thus, thermal-hydraulic calculations are not involved.…”

Section: Introductionmentioning

confidence: 99%

Multi-Assembly Analysis with an Advanced Correlated Sampling Method

Moriwaki

2003

J. Nucl. Sci. Technol.

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“…On the other hand, for the purpose of enabling to evaluate various reaction rates in the core analysis method using the direct response matrix method [6][7][8][9], the author has developed the reconstruction method of homogenized cross sections. In this reconstruction method, homogenized cross sections, which take into consideration the influences of neighboring fuel assemblies, are reconstructed with the response relationship of the incoming neutron partial currents and the neutron production rates.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction method of homogenized cross sections

Ishii

2013

Journal of Nuclear Science and Technology

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The reconstruction method of homogenized cross sections in the direct response matrix method has been developed. In this reconstruction method, homogenized cross sections, which take into consideration the influences of neighboring fuel assemblies, can be reconstructed with the response relationship of incoming neutron partial currents and neutron production rates. Calculations for heterogeneous multi fuel assembly systems were done to verify the developed method. The thermal energy group fuel assembly cell-averaged homogenized cross sections reconstructed by this method agreed with those evaluated by the direct calculation of the whole system using the Monte Carlo method within 0.2%. The effect using the reconstructed fuel assembly cell-averaged homogenized cross sections in a conventional core analysis code using cross sections homogenized in a fuel assembly cell was also investigated. The results obtained showed that the analysis accuracy of k-infinity can be improved by using the cross sections reconstructed by the method. Because almost no influences on the analysis accuracy could be found related to the divided numbers of the surfaces and the angles, and the response relationship with neutron production rates of fuel rods or a fuel assembly cell-averaged neutron production rate, this reconstruction method is applicable to a conventional core analysis code using homogenized cross sections in a fuel assembly cell.

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The Incident Flux Response Expansion Method for Heterogeneous Coarse Mesh Transport Problems

Mosher

Rahnema

2006

Transport Theory and Statistical Physics

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A New Direct Calculation Method of Response Matrices Using a Monte Carlo Calculation.

Cited by 7 publications

References 2 publications

Multi-Assembly Analysis with an Advanced Correlated Sampling Method

Multi-Assembly Analysis with an Advanced Correlated Sampling Method

Reconstruction method of homogenized cross sections

The Incident Flux Response Expansion Method for Heterogeneous Coarse Mesh Transport Problems

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