Uncertainty quantification of the early Deterministic Truncation of

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In this study, a new approach to evaluate uncertainties of the multiplication factor and the pin-power distribution from the CMFD parameters is suggested for the DTMC method. The CMFD parameters from sufficiently converged inactive cycles are used to predict uncertainties of the very first active cycle, as the ultimate purpose of the DTMC method is to determine the solution only with a few, or even a single active cycle. Normal distributions of the CMFD parameters are estimated based on the uncertainties of the CMFD parameters that are calculated from the inactive cycles. Then, the parameters are resampled multiple times to calculate the uncertainty of the solution. As a preliminary study, the standard deviation predicted from the method is compared with the real standard deviation obtained from multiple independent batch calculations. Instead of solving explicit power iterations repeatedly, the first-order perturbation formula is used to calculate the uncertainty of the multiplication factor. Here, equivalence of the one-group forward flux and the one-group adjoint flux is used for the perturbation formula. By using several tens of cycles, the proposed method is able to predict the real standard deviation with a few pcm margins. The amount of contribution to the uncertainty by the CMFD parameters are calculated with the aforementioned algorithm.
Advisors
Kim, Yongheeresearcher김용희researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2018.8,[iii, 33 p. :]

Keywords

DTMC method▼amonte carlo simulation▼auncertainty quantification▼aCMFD acceleration▼a$1^{st}$-order perturbation; DTMC 방법론▼a몬테칼로 시뮬레이션▼a불확실도 평가▼aCMFD 가속▼a1차 섭동

URI
http://hdl.handle.net/10203/266540
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=828557&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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