An improved deterministic truncation of Monte Carlo solution for pin-resolved nuclear reactor analysis

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An improved deterministic truncation of Monte Carlo (iDTMC) solution method has been developed for acceleration and variance reduction of Monte Carlo (MC) neutronic analysis. A new calculational strategy has been applied by taking advantages of partial-current-based coarse mesh finite difference (p-CMFD) method with two different mesh sizes in a tactical way. Fast convergence of source distribution is attained by a coupled assembly-wise p-CMFD method in inactive cycles, and detailed deterministic solutions are obtained by a decoupled pin-wise p-CMFD method in active cycles. Assistant schemes are also devised to enhance efficiency of the iDTMC method, which include one-node p-CMFD acceleration, new inactive cycle strategy, and real variance estimation method for iDTMC solutions. The iDTMC method is evaluated in a small reactor and a big-size one. The iDTMC solutions are compared with those of the pCMFD accelerated MC calculation, and they are appraised in terms of source convergence, computing time, and figure-of-merit. (c) 2021 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2022-02
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.166

ISSN
0306-4549
DOI
10.1016/j.anucene.2021.108723
URI
http://hdl.handle.net/10203/288497
Appears in Collection
NE-Journal Papers(저널논문)
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