Applicability of Constant Flux Approximation in Method of Characteristics with Filtering to Tiny Regions
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概要
- 論文の詳細を見る
For the method of characteristic (MOC), a system with large-gradient neutron flux caused by a strong absorber or neutron leakage is reported to entail large errors in spatial mesh discretization and require very fine mesh spacing. To apply the MOC to such fine models, the ray-trace path width has to be fine in order to make many paths cross each region. Our new method intends to obtain good accuracy with a coarse path width. With a coarse path width on the MOC, some tiny regions have less ray-tracing paths. The reliability of flux calculation for the regions can be evaluated with the calculation volumes that are estimated in ray tracing. If the discrepancy between the calculation and true volumes becomes large, the accuracy cannot be expected. In this study, the discrepancies were numerically evaluated, and it is found that the discrepancies occur on a very tiny region. To make the flux calculation of such tiny regions more reliable, an approximation, in which the outgoing flux is equal to the incoming neutron, is applied instead of the usual MOC equation. The criteria switching on the approximation, which is called filtering, was numerically evaluated for PWR assemblies. The method is validated with numerical benchmark calculations.
- 社団法人 日本原子力学会の論文
- 2009-09-01
著者
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YAMAJI Kazuya
Method and Software Development Group, Reactor Core Engineering Department, Mitsubishi Heavy Industr
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MATSUMOTO Hideki
Method and Software Development Group, Reactor Core Engineering Department, Mitsubishi Heavy Industr
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SATO Daisuke
Method and Software Development Group, Reactor Core Engineering Department, Mitsubishi Heavy Industr
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TAKEDA Toshikazu
Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka
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Yamaji Kazuya
Method And Software Development Group Reactor Core Engineering Department Mitsubishi Heavy Industrie
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Takeda Toshikazu
Div. Of Sustainable Energy And Enviromental Engineering Graduate School Of Engineering Osaka Univ.
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Takeda Toshikazu
Department Of Sustainable Energy And Environmental Engineering Graduate School Of Engineering Osaka
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Takeda Toshikazu
Division Of Sustainable Energy And Environmental Engineering Graduate School Of Engineering Osaka Un
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MATSUMOTO Hideki
Mitsubishi Heavy Industries, Ltd.
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Matsumoto Hideki
Method And Software Development Group Reactor Core Engineering Department Mitsubishi Heavy Industrie
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Takeda Toshikazu
Division Of Sustainable Energy And Environment Engineering Graduate School Of Engineering Osaka Univ
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Takeda Toshikazu
Division Of Sustainable Energy And Environmental Engineering Graduate School Of Engineering Osaka Un
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Sato Daisuke
Method And Software Development Group Reactor Core Engineering Department Mitsubishi Heavy Industrie
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