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Research Papers

The Powerful Method of Characteristics Module in Advanced Neutronics Lattice Code KYLIN-2

[+] Author and Article Information
Xiaoming Chai

State Key Laboratory of Reactor System
Design Technology,
Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: chaixm@163.com

Xiaolan Tu

Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: tuxiaolan2014@126.com

Wei Lu

Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: luwei9s@sina.cn

Zongjian Lu

State Key Laboratory of Reactor System
Design Technology,
Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: 317142242@qq.com

Dong Yao

State Key Laboratory of Reactor System
Design Technology,
Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: yaodong_npic@163.com

Qing Li

Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: liqing-npic@126.com

Wenbin Wu

Nuclear Power Institute of China (NPIC),
No. 328, Road Changshun, Shuangliu,
Chengdu 610041, China
e-mail: wenbinwu@126.com

1Corresponding author.

Manuscript received September 24, 2016; final manuscript received February 5, 2017; published online May 25, 2017. Assoc. Editor: Leon Cizelj.

ASME J of Nuclear Rad Sci 3(3), 031004 (May 25, 2017) (9 pages) Paper No: NERS-16-1110; doi: 10.1115/1.4035934 History: Received September 24, 2016; Revised February 05, 2017

Due to powerful geometry treatment capability, method of characteristics (MOC) currently becomes one of the best method to solve neutron transport equation. In MOC method, boundary condition treatment, complex geometry representation, and advanced acceleration method are the key techniques to develop a powerful MOC code to solve complex problem. In this paper, we developed a powerful MOC module, which can treat different boundary conditions with two methods. For problems with special border shapes and boundary condition, such as rectangle, 1/8 of square, hexagon, 1/3 of hexagon, 1/6 of hexagon problems with reflection, rotation, and translation boundary condition, the MOC module adopts periodic tracking method, with which rays can return to start point after a certain distance. For problems with general border shapes, the MOC module uses ray prolongation method, which can treat arbitrary border shapes and boundary conditions. Meanwhile, graphic user interface based on computer aided design (CAD) software is developed to generate the geometry description file, in which geometry is represented by “lines and arcs” method. With the graphic user interface, the geometry and mesh can be described and modified correctly and fast. In order to accelerate the MOC transport calculation, the generalized coarse mesh finite difference (GCMFD) is used, which can use irregular coarse mesh diffusion method to accelerate the transport equation. The MOC module was incorporated into advanced neutronics lattice code KYLIN-2, which was developed by Nuclear Power Institute of China (NPIC) and used to simulate the assembly of current pressurized water reactor (PWR) and advanced reactors, to solve the transport equation with multigroup energy structure in cross sections database. The numerical results show that the KYLIN-2 code can be used to calculate 2D neutron transport problems in reactor accurately and fast. In future, the KYLIN-2 code will be released and gradually become the main neutron transport lattice code in NPIC.

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References

Figures

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Fig. 1

The MOC representation of trajectories

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Fig. 2

A compound periodic trajectory in a rectangular domain with translation boundary conditions

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Fig. 3

A compound periodic trajectory in a hexagonal domain with translation boundary conditions

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Fig. 4

The prolongation trajectories for trajectory 1

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Fig. 5

The calculation flow of MOC module in KYLIN-2

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Fig. 8

Geometry of hexagonal of bundle problem (cm)

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Fig. 9

Configuration of one sixth of the hexagonal bundle problem

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Fig. 10

Fine meshes and homogenized coarse meshes

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Fig. 11

C5G7 UO2 assembly

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Fig. 12

Fine mesh in each cell geometry (cm)

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