(A) modified nodal diffusion method for applying to PWR core anlaysis = 수정노달 확산법의 PWR 노심 해석에의 응용

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A modification to the conventional coarse mesh diffusion theory was made at M.I.T. and applied to Fast Reactor Analysis. The present study uses basically the same method which is coded into the DIFDIS(DIFfusion equation with flux DIScontinuity factors). Unfortunately, when applied to the realistic PWR``s, the large discrepancy in the predicted power distribution was found. It is attributed to the facts that the shape of the thermal flux in the vicinity of the core boundary does not share the shape of the fast flux, and that both thermal and fast flux gradients are very steep at the core boundary. These facts wholly result from the existence of the baffle. Two methods are developed from this study which treat the influence of the baffle effectively. They are the Boundary Color Set Method and the Global Local Iteration Method which are different from the current methods in the fact that in both methods the local calculations are done for only core boundary nodes. Both methods give excellent results, and need the small core memory and computing time which make the modified nodal diffusion method competitive with the other modern nodal methods in the viewpoint of economy and accuracy.
Advisors
Chang, Moon-Hee장문희
Description
한국과학기술원 : 핵공학과,
Publisher
한국과학기술원
Issue Date
1986
Identifier
65444/325007 / 000841512
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 핵공학과, 1986.2, [ 68 p. ]

URI
http://hdl.handle.net/10203/49110
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=65444&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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