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Journal Articles

Application of the modified neutron source multiplication method to the prototype FBR Monju

Truchet, G.*; Van Rooijen, W. F. G.*; Shimazu, Yoichiro*; Yamaguchi, Katsuhisa

Annals of Nuclear Energy, 51, p.94 - 106, 2013/01

 Times Cited Count:6 Percentile:49.64(Nuclear Science & Technology)

The Modified Neutron Source Method (MNSM) is applied to the prototype FBR Monju. Among Monju's particularities that have a big influence on the MNSM factors are: the presence of two californium sources near the core and the position of the detector, which is located far from the core outside of the reactor vessel. In order to evaluate the detector count rate, a propagation calculation has been conducted from the reactor vessel to the external detector. For two subcritical states, an estimation of the reactivity has been made and compared to experimental data obtained in the restart experiments at Monju (2010). Results indicate a good agreement between the MNSM reactivity and the reactivity measured with other methods.

Journal Articles

Diffusion coefficients for LMFBR cells calculated with MOC and Monte Carlo methods

Van Rooijen, W. F. G.*; Chiba, Go

Annals of Nuclear Energy, 38(1), p.133 - 144, 2011/01

 Times Cited Count:13 Percentile:74.14(Nuclear Science & Technology)

The present work discusses the calculation of the diffusion coefficient of a lattice of hexagonal cells, with both "sodium present" and "sodium absent" conditions. Calculations are performed in the framework of lattice theory. Unlike the classical approaches, our heterogeneous leakage model allows the calculation of diffusion coefficients under all conditions, even if planar voids are present in the lattice. Equations resulting from this model are solved using the method of characteristics (MOC). Independent confirmation of the MOC result comes from Monte Carlo calculations, in which the diffusion coefficient is obtained without any of the assumptions of lattice theory. It is shown by comparison to the Monte Carlo results that the MOC solution yields correct values of the diffusion coefficient under all conditions, even in cases where the classic calculation of the diffusion coefficient fails.

Journal Articles

Monte Carlo based diffusion coefficients for LMFBR analysis

Van Rooijen, W. F. G.*; Hazama, Taira; Takeda, Toshikazu*

Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive), 14 Pages, 2010/10

For the reactor physics analysis of fast critical assemblies as well as LMFBRs, the diffusion coefficient is one of the required pieces of data. In the present analysis, the diffusion coefficient is determined using the Benoist-formalism, which is based on directional collision probabilities. For LMFBR analysis including void regions, the Benoist-formalism breaks down if two-dimensional (slab or slab-like) void regions are present. Furthermore, the Benoist-style assumption of zero buckling is questionable in fast reactors. Research is being done to identify improved cell calculations, in order to calculate the diffusion coefficient in one- and two-dimensional unit cells containing real void regions.

Oral presentation

Calculation of diffusion coefficients for voided lattices with the method of characteristics, 2; Numerical results

Chiba, Go; Van Rooijen, W. F. G.*

no journal, , 

Anisotropic diffusion coefficients for voided hexagonal lattices, which cannot be obtained using the classical benoist formalism, are successfully calculated with the method of characteristics. The proposed method is free from the divergence problem, and results in more rigorous diffusion coefficients based on the leakage theory.

Oral presentation

On the cell homogenization for a lattice composed of asymmetric unit cells

Chiba, Go; Van Rooijen, W. F. G.*

no journal, , 

A property of a lattice composed of asymmetric unit cells is investigated. It is shown that usual deterministic calculation procedure based on the unit cell homogenization works well even if the unit cell is asymmetric by considering a direction dependence of homogenized total cross sections.

Oral presentation

The Modified neutron multiplication method for Monju

Yamaguchi, Katsuhisa; Truchet, G.*; Van Rooijen, W. F. G.*; Shimazu, Yoichiro*

no journal, , 

Oral presentation

Application of the JENDL-4.0 nuclear data set for the uncertainty analysis of the prototype FBR Monju

Konomura, Mamoru; Tamagno, P.*; Takeda, Toshikazu*; Van Rooijen, W. F. G.*

no journal, , 

Oral presentation

Application of the JENDL-4.0 nuclear data set for uncertainty analysis of the prototype FBR Monju

Konomura, Mamoru; Tamagno, P.*; Van Rooijen, W. F. G.*; Takeda, Toshikazu*

no journal, , 

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