(A) combination of generalized equivalence theory and super-homogenization for cross-section corrections in pin-wise PWR diffusion analysis = 가압경수로 격자단위 중성자 확산 해석시 단면적 보정을 위한 일반등가이론(GET)과 SPH 방법론의 결합

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In this thesis, a new leakage correction method called GET plus SPH (GPS) method has been introduced to correct the pin-wise homogenized two-group cross-sections by taking into account the neutron leakage information. In order to improve the accuracy in the conventional two-step core analysis, the pin-wise cross-section (XS)-dependent SPH factors are introduced and functionalized in terms of the integrated pin-wise albedo information, i.e., current-to-flux ratio (CFR), via the GPS method. To acquire the relationship between the CFR information and the corresponding XS-dependent SPH factors, small color-set models were considered. These color-set problems are comprised of several fuel assemblies (FAs) to obtain physically meaningful pin-wise CFR values for various lattice environments. The proposed GPS method was implemented to an in-house pin-by-pin nodal expansion method (NEM)-based solver with the pin-wise CMFD acceleration. To evaluate the performance of the GPS method, various benchmark problems based on an SMR initial core and a large PWR core were analyzed. In order to demonstrate the general applicability of the GPS functions, several modified core configurations were also solved by using the same GPS functions. In addition, fully rodded benchmark problems were examined to test the GPS method in the extremely abnormal core configurations. Finally, the GPS method was applied to various partially MOX-loaded PWR cores to demonstrate its applicability to extremely difficult reactor problems. The comprehensive results of this research illustrate that the GPS method can substantially enhance the accuracy of the pin-wise reactor analyses with a reasonably small additional computational costs.
Advisors
Kim, Yong Heeresearcher김용희researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2019.2,[iv, 126 p. :]

Keywords

Pressurized water reactor▼apin-by-pin core analysis▼ageneralized equivalence theory▼asuper-homogenization method▼aGPS method▼aleakage correction; 가압경수로▼a격자단위 노심해석▼a노달 등가이론▼aSuper-homogenization 방법▼aGPS 방법▼a중성자 누설 보정

URI
http://hdl.handle.net/10203/265041
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=842173&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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