BROWSE

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Lee, Deokjung
Computational Reactor physics & Experiment lab (CORE Lab)
Research Interests
  • Reactor Analysis computer codes development
  • Methodology development of reactor physics
  • Nuclear reactor design(SM-SFR,PWR and MSR)

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A New Equivalence theory Method for Treating Doubly Heterogeneous Fuel ? I: Theory

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Title
A New Equivalence theory Method for Treating Doubly Heterogeneous Fuel ? I: Theory
Author
Lee, DeokjungWilliams, Mark L.Choi, Sooyoung
Issue Date
2015-05
Publisher
AMER NUCLEAR SOC
Citation
NUCLEAR SCIENCE AND ENGINEERING, v.180, no.10, pp.30 - 40
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
URI
https://scholarworks.unist.ac.kr/handle/201301/9526
URL
http://www.ans.org/pubs/journals/nse/a_36950
DOI
10.13182/NSE14-68
ISSN
0029-5639
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