Reactivity Analysis Model Based on Finite Difference Method for Three-Dimensional Fast Breeder Reactor Core Deformation

Azekura, Kazuo

doi:10.13182/nt87-a33965

Cited by 1 publication

(2 citation statements)

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“…The macroscopic neutron cross sections in the deformed assembly region i are given by This calculation method can be shown to be equivalent to the eigenvalue calculation method described in Ref. (3) except for the treatment of the direction-dependence of neutron leakage, which is ignored in the previous method.…”

Section: Ll Outline Of Calcu-lation Methodsmentioning

confidence: 99%

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Three-Dimensional First-Order Perturbation Calculation Method for Reactivity Changes Due to Core Deformations of Fast Breeder Reactors

Azekura

Hayase

1989

Journal of Nuclear Science and Technology

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A three-dimensional diffusion calculation method has been proposed to rapidly and accurately calculate reactivity changes of LMFBRs caused by assembly displacements in accidental events. The method requires shorter computation times and provides almost the same accuracy as a conventional direct eigenvalue calculation method. In this method, changes in macroscopic neutron cross-sections and diffusion coefficient are defined so that changes in both region volume and material composition can be treated in a mesh-centered finite-difference program under the same coarse mesh division as used for the normal, non-deformed core. Reactivity changes are calculated from the above-mentioned changes by the first-order perturbation method using normal and adjoint neutron fluxes calculated beforehand for the normal core.The method was applied to deformations of a 1,000-MWe LMFBR core. Reactivity changes calculated by the method agreed within 0.4% with those by a conventional direct eigenvalue calculation method, while computation time was less than l/35.

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Section: Ll Outline Of Calcu-lation Methodsmentioning

confidence: 99%

“…It has been applied to radial deformations of a large homogeneous LMFBR core to compare its calculated results with those of the direct eigenvalue calculation method in Ref. (3).…”

Section: And Conclusionmentioning

confidence: 99%