Axial SP<sub>N</sub>and Radial MOC Coupled Whole Core Transport Calculation

Cho, Jin-Young; Kim, Kang-Seog; Lee, Chung-Chan; Zee, Sung-Quun; Joo, Han Gyu

doi:10.1080/18811248.2007.9711359

Cited by 29 publications

(9 citation statements)

References 6 publications

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“…The error levels shown in Table 6 for the hexagonal problems are very similar to those for the rectangular C5G7MOX benchmark problems that are described in Ref. 6). Table 6 also shows the computing time breakups.…”

Section: Effectiveness Test For the Modified Cycle Ray Schemesupporting

confidence: 60%

“…The axial nodal calculation scheme is well described in Ref. 6). Figure 13 shows the pin power errors for the 2-D C5G7 problem.…”

Section: Effectiveness Test For the Modified Cycle Ray Schemementioning

confidence: 99%

“…One such method is the DeCART method, which is characterized by the planar method of characteristics (MOC) solution and an axial nodal simplified P N (SP N ) solution integrated into the three-dimensional (3-D) coarse-mesh finite difference (CMFD) formulation. 6) However, the DeCART method is limited to rectangular assembly core problems. Since many Generation IV reactor designs involve hexagonal assemblies, there was a strong need for a hexagonalgeometry-handling feature in DeCART for applications to advanced reactor designs.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, an acceleration scheme is required to obtain a whole core MOC transport solution efficiently. In DeCART, an axial nodal SP N solution-coupled CMFD formulation 6) based on a pin cell is used as a basic acceleration scheme for the whole core transport calculation. This formulation enables a fully consistent MOC transport solution for the radial direction and an SP N transport solution for the axial direction.…”

Section: Introductionmentioning

confidence: 99%

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Whole Core Transport Calculation Employing Hexagonal Modular Ray Tracing and CMFD Formulation

CHO

KIM

Shim

et al. 2008

J. Nucl. Sci. Technol.

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A whole core transport module for hexagonal cores is developed and implemented in the DeCART code. The module consists of a whole core ray tracing kernel for solving the two-dimensional (2-D) method of characteristics (MOC) equation and a coarse-mesh finite difference (CMFD) kernel to accelerate the MOC transport iteration. Whole core ray tracing is realized by incorporating a hexagonal-assemblybased modular ray tracing scheme. The complete path linking constraint for the modular ray is achieved by adjusting the ray angle and the ray spacing in the range of [0, 30 ], and the complete reflection constraint at the problem boundary is satisfied by defining the corresponding reflection angles at the reflection surfaces. The hexagonal CMFD kernel employs unstructured nodes that can treat the irregular-shaped gap cells as well as the regular hexagonal cells. Some features such as cell ray approximation and modified cycle ray scheme are employed to reduce the memory requirements for the segment information and the boundary angular fluxes, respectively. The solution accuracy and execution performance of the hexagonal module are examined for the C5G7 hexagonal variation problems that are established by modifying the original C5G7MOX 3-D extension benchmark. The CMFD kernel shows a significant speedup of 60 in the 2-D core problem. The cell ray approximation does not violate the original solution accuracy when using the default ray spacing of the DeCART code. The modified cycle ray scheme shows its superiority over the simple core ray sweeping scheme in terms of the memory requirement and the original cycle ray scheme in terms of the computing time. Compared with the Monte Carlo solutions, the DeCART solution agrees to within 40 pcm for the eigenvalue and 2% for the pin power distribution.

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Section: Effectiveness Test For the Modified Cycle Ray Schemesupporting

confidence: 60%

“…The axial nodal calculation scheme is well described in Ref. 6). Figure 13 shows the pin power errors for the 2-D C5G7 problem.…”

Section: Effectiveness Test For the Modified Cycle Ray Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Whole Core Transport Calculation Employing Hexagonal Modular Ray Tracing and CMFD Formulation

CHO

KIM

Shim

et al. 2008

J. Nucl. Sci. Technol.

Self Cite

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show abstract

“…The idea of splitting up the 3D transport equation in a 2D/1D like manner that treats the axial portion in a distinct fashion from the radial portion has its roots in two independent publications from 2002. These two methods were the "2D/1D" method developed by the Korea Atomic Energy Research Institute (KAERI) to be used in DeCART [21] (and later nTRACER [22]) and the "2D/1D Fusion" method developed by the Korea Advanced Institute of Science and Technology (KAIST) for the CRX code [23] [24].…”

Section: History Of 2d/1d Methodsmentioning

confidence: 99%