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Dynamic implementation of the equivalence theory in the heterogeneous whole core transport calculation

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Authors
Joo, Han Gyu; Cho, Jin Young
Issue Date
2002-10-08
Publisher
American Nuclear Society
Citation
PHYSOR 2002 - The Physics of Fuel Cycles and Advanced Nuclear Systems: Global Developments, Seoul, Korea, October 7-10, 2002
Keywords
MOCCMFDEquivalence TheoryDeCART
Abstract
The coarse mesh finite difference (CMFD) formulation is applied to the heterogeneous whole
transport calculation as a means of efficient acceleration as well as simplified representation. A pin
cell is chosen as the base coarse mesh which is much coarser than the intra-cell flat source regions.
The CMFD formulation enables dynamic homogenization of the cells during the iterative solution
process such that the heterogeneous transport solution can be preserved. Dynamic group condensation
is also possible with a two-level CMFD formulation involving alternate multigroup and two group
calculations. The two-dimensional method of characteristics (MOC) is used as the kernel to generate
the heterogeneous solution and the CMFD solution provides the MOC kernel with much faster
converged fission and scattering source distributions. Through the applications to various problems
including different compositions, sizes, and energy groups, it is shown that the performance of the
CMFD formulation is superior in that the number of the MOC calculations can be reduced below 10
while reproducing exactly the original transport solution. The merit of the CMFD formulation is
greater for larger problems in which speedups of 100-300 are possible when compared to the
unaccelerated case.
Language
English
URI
http://hdl.handle.net/10371/9631
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Nuclear Engineering (원자핵공학전공)Others_원자핵공학과
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