Some Studies on the Effectiveness of Control Rods
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概要
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The linear extraporation distances for epi-thermal neutrons on various neutron absorbers were obtained experimentally with the use of a natural UO<SUB>2</SUB>-H<SUB>2</SUB>0 cyrindrical exponential column. The measured flux distributions or flux-depression distributions around the control rod were compared with calculated values. It was confirmed that, except in the region immediately around the absorber, the radial flux distributions or depressions can be calculated accurately by the two-group approxima-tion using these linear extrapolation distances obtained experimentally for epi-thermal neutrons, and those calculated by the Kushneriuk-McKay method for thermal neutrons.<BR>The flux depressions on the surface of the control rod were measured to be almost constant, and independent of the lattice position of the control rod inserted. This fact simplifies the calculation for evaluating the reactivity worth of the control rod by the perturbation theory.<BR>The scattering effect of the control rod on its effectiveness was studied experimentally with the use of SHE, a 20% enriched UO<SUB>2</SUB>-graphite moderated critical assembly. Sometimes a scatterer (graphite slug) inserted inside a hollow conrol rod decreases the reactivity worth by more than 10%.
- 一般社団法人 日本原子力学会の論文
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- Some Studies on the Effectiveness of Control Rods