Few-group condensation via two-material coexisting ring model for fast reactor core analysis

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To improve the currently used simplified fast reactor analysis method for few-group condensation, a two-material coexisting ring model is proposed in this study. In the two-material coexisting ring model, the theta-direction homogenized model from the R-theta-Z geometry is solved, but the neutron flux for each material in the homogenized region is obtained separately. In the numerical results on simple 2-D fast reactor test problems, the newly proposed two-material coexisting ring model shows excellent neutron spectrum agreement with the reference, as compared to the conventional simplified model. In addition, the few-group calculation result shows better k(eff) estimation when a two-material coexisting ring model is used for group condensation. Because relative errors on the neutron spectrum are much flattened when the newly proposed model is used, accurate few-group cross sections can be generated even if a small few-group structure is selected for condensation.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2015-09
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.83, pp.172 - 180

ISSN
0306-4549
DOI
10.1016/j.anucene.2015.04.017
URI
http://hdl.handle.net/10203/203922
Appears in Collection
NE-Journal Papers(저널논문)
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