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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? II: Verifications

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Title
A New Equivalence theory Method for Treating Doubly Heterogeneous Fuel? II: Verifications
Author
Lee, DeokjungChoi, SooyoungWilliams, Mark L.Kong, Chidong
Issue Date
2015-05
Publisher
AMER NUCLEAR SOC
Citation
NUCLEAR SCIENCE AND ENGINEERING, v.180, no.1, pp.41 - 57
Abstract
A new methodology has been developed recently to treat resonance self-shielding in systems for which the fuel compact region of a reactor lattice consists of small fuel grains dispersed in a graphite matrix. The theoretical development adopts equivalence theory in both micro- and macro-level heterogeneities to provide approximate analytical expressions for the shielded cross sections, which may be interpolated from a table of resonance integrals or Bondarenko factors using a modified background cross section as the interpolation parameter. This paper describes the first implementation of the theoretical equations in a reactor analysis code. To reduce discrepancies caused by use of the rational approximation for collision probabilities in the original derivation, a new formulation for a doubly heterogeneous Bell factor is developed in this paper to improve the accuracy of doubly heterogeneous expressions. The methodology is applied to a wide range of pin cell and assembly test problems with varying geometry parameters, material compositions, and temperatures, and the results are compared with continuous-energy Monte Carlo simulations to establish the accuracy and range of applicability of the new approach. It is shown that the new doubly heterogeneous self-shielding method including the Bell factor correction gives good agreement with reference Monte Carlo results.
URI
https://scholarworks.unist.ac.kr/handle/201301/9523
URL
http://www.ans.org/pubs/journals/nse/a_37006
DOI
10.13182/NSE14-72
ISSN
0029-5639
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