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Multiobjective loading pattern optimization by simulated annealing employing discontinuous penalty function and screening technique

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Authors
Park, Tong Kyu; Joo, Han Gyu; Kim, Chang Hyo; Lee, Hyun Chul
Issue Date
2009-06-01
Publisher
American Nuclear Society
Citation
Nucl. Sci. Eng., 162, 134 (2009)
Keywords
MultiobjectiveLoading PatternSimulated AnnealingDiscontinuous Penalty FunctionScreening
Abstract
The problem of multiobjective fuel loading pattern (LP) optimization employing high-fidelity
three-dimensional (3-D) models is resolved by introducing the concepts of discontinuous penalty function,
dominance, and two-dimensional (2-D)–based screening into the simulated annealing (SA) algorithm.
Each constraint and objective imposed on a reload LP design is transformed into a discontinuous penalty
function that involves a jump to a quadratic variation at the point of the limiting value of the corresponding
core characteristics parameter. It is shown that with this discontinuous form the sensitivity of the
penalty coefficients is quite weak compared to the stochastic effect of SA. The feasible LPs found during SA
update the set of candidate LPs through a dominance check that is done by examining multiple objectives
altogether. The 2-D–based screening technique uses a precalculated database of the 2-D solution errors
and is shown to be very effective in saving the SA computation time by avoiding 3-D evaluations for the
unfavorable LPs that are frequently encountered in SA. Realistic applications of the proposed method to a
pressurized water reactor reload LP optimization with the dual objectives of maximizing the cycle length
and minimizing the radial peaking factor demonstrate that the method works quite well in practice.
ISSN
0029-5639
Language
English
URI
http://hdl.handle.net/10371/8780
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Nuclear Engineering (원자핵공학전공)Journal Papers (저널논문_원자핵공학과)
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