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Lee, Deokjung
Computational Reactor physics & Experiment Lab.
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dc.citation.endPage 40 -
dc.citation.number 10 -
dc.citation.startPage 30 -
dc.citation.title NUCLEAR SCIENCE AND ENGINEERING -
dc.citation.volume 180 -
dc.contributor.author Lee, Deokjung -
dc.contributor.author Williams, Mark L. -
dc.contributor.author Choi, Sooyoung -
dc.date.accessioned 2023-12-22T01:16:48Z -
dc.date.available 2023-12-22T01:16:48Z -
dc.date.created 2014-12-19 -
dc.date.issued 2015-05 -
dc.description.abstract A new methodology has been developed to treat resonance self-shielding in doubly heterogeneous very high temperature gas-cooled reactor systems in which the fuel compact region of a reactor lattice consists of small fuel grains dispersed in a graphite matrix. The new method first homogenizes the fuel grain and matrix materials using an analytically derived disadvantage factor from a two-region problem with equivalence theory and intermediate resonance method. The disadvantage factor accounts for spatial self-shielding effects inside each grain within the framework of an infinite array of grains. Then the homogenized fuel compact is self-shielded using a Bondarenko method to account for interactions between the fuel compact regions in the fuel lattice. In the final form of the equations for actual implementations, the double-heterogeneity effects are accounted for by simply using a modified definition of a background cross section, which includes geometry parameters and cross sections for both the grain and fuel compact regions. With the new method, the doubly heterogeneous resonance self-shielding effect can be treated easily even with legacy codes programmed only for a singly heterogeneous system by simple modifications in the background cross section for resonance integral interpolations. This paper presents a detailed derivation of the new method and a sensitivity study of double-heterogeneity parameters introduced during the derivation. The implementation of the method and verification results for various test cases are presented in the companion paper -
dc.identifier.bibliographicCitation NUCLEAR SCIENCE AND ENGINEERING, v.180, no.10, pp.30 - 40 -
dc.identifier.doi 10.13182/NSE14-68 -
dc.identifier.issn 0029-5639 -
dc.identifier.scopusid 2-s2.0-84931835403 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/9526 -
dc.identifier.url http://www.ans.org/pubs/journals/nse/a_36950 -
dc.identifier.wosid 000353931800002 -
dc.language 영어 -
dc.publisher AMER NUCLEAR SOC -
dc.title A New Equivalence theory Method for Treating Doubly Heterogeneous Fuel ? I: Theory -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Nuclear Science & Technology -
dc.relation.journalResearchArea Nuclear Science & Technology -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -

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