Conferences
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DECOUPLED PLANAR MOC SOLUITION FOR DYNAMIC GROUP CONSTANT GENERATION IN DIRECT THREE-DIMENSIONAL CORE CALCULATIONS
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people
Yeon Sang Jung, Han Gyu Joo
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M&C (2009)
A decoupled planar method of characteristics (MOC) solution based direct three-dimensional (3-
D) core calculation scheme is introduced as an effort to enhance the solution stability and accuracy
of a hybrid transport solution scheme employing the MOC only to the radial solution. Each planar
MOC problem is solved as an eigenvalue problem with the axial leakage converted into the
pseudo absorption cross section. The MOC-generated cell homogenized group constants and the
current correction factors which are to be used in the subsequent coarse mesh finite difference
(CMFD) formulation are not iteratively updated unlike the coupled scheme. The resulting 3-D
CMFD problem is thus solved as an isolated problem. The decoupled scheme is applied to the
rodded problems of the C5G7MOX benchmark to show that the degradation of the solution
accuracy is negligible while the gain in the computing time is significant.
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