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Calculation method and system for lattice cell equivalent homogenization constant in reactor core rod-by-rod calculation

A calculation method and homogenization technology, applied in the calculation method and system field of effective homogenization constants, can solve complex problems and achieve the effect of reducing storage requirements and parameterized calculations

Active Publication Date: 2021-08-27
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0005] However, as the spatial grid of the core calculation changes from a coarse grid of component homogenization to a fine grid of cell uniformity, and the homogenization area also changes from an optically thick medium to an optically thin medium, the core calculation is becoming more and more complex. Precise and more complex

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  • Calculation method and system for lattice cell equivalent homogenization constant in reactor core rod-by-rod calculation
  • Calculation method and system for lattice cell equivalent homogenization constant in reactor core rod-by-rod calculation
  • Calculation method and system for lattice cell equivalent homogenization constant in reactor core rod-by-rod calculation

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Embodiment 1

[0039] Embodiment 1: Calculation method of the cell equivalent homogenization constant in the rod-by-rod calculation of the core, such as figure 1 shown, including the following steps:

[0040] S1: Carry out single-component grid calculation under total reflection boundary conditions, and obtain the homogenized cross-section parameters of each cell type after cell homogenization;

[0041] S2: Initialize the super uniformization factor;

[0042]S3: Correct the homogenized cross-section generated by cell homogenization according to the super-homogenization factor, and use the core neutronics solution method to calculate the component problem of cell homogenization under total reflection boundary conditions, and obtain the homogenized cell Average neutron flux density;

[0043] S4: Update the super homogenization factor according to the homogenization section parameters and the average neutron flux density;

[0044] S5: Determine whether the updated super-homogenization factor...

Embodiment 2

[0052] Embodiment 2: The calculation system of the cell equivalent homogenization constant in the calculation of the core rod by rod, such as figure 2 As shown, the calculation system is used to realize the calculation of the method described in Embodiment 1, including a calculation module, an initialization module, a correction module, an update module, and a judgment module.

[0053] Among them, the calculation module is used to calculate the single-component grid under the total reflection boundary condition, and obtain the homogenized cross-section parameters of each cell type after the cells are homogenized. The initialization module is used to initialize the super uniformization factor. The correction module is used to correct the homogenized section generated after cell homogenization according to the super homogenization factor, and uses the core neutronics solution method to calculate the component problem of cell homogenization under total reflection boundary condit...

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Abstract

The invention discloses a calculation method and system for lattice cell equivalent homogenization constants in reactor core rod-by-rod calculation, relates to the field of nuclear reactor core design and reactor physical calculation, and solves the problems of large storage requirements of existing lattice cell equivalent homogenization few-group constants and large parameterization calculation amount. According to the technical scheme, the method is characterized in that homogenization sections related to lattice cell types are calculated, then super homogenization factors of all lattice cells are calculated through a super homogenization method according to the homogenization sections, and therefore lattice cell equivalent homogenization constants are formed, the spatial correlation of the lattice cell equivalent homogenization constants in reactor core rod-by-rod calculation is reduced, and the calculation efficiency of the reactor core rod-by-rod calculation is improved. Therefore, the storage requirement and the parameterization calculation amount of lattice cell equivalent homogenization few-group constants are reduced, and an important supporting effect is provided for engineering application of full-reactor-core rod-by-rod calculation.

Description

technical field [0001] The invention relates to the fields of nuclear reactor core design and reactor physical calculation, more specifically, it relates to a calculation method and system for cell equivalent homogenization constant in the calculation of the core by rod. Background technique [0002] The PWR core is generally composed of hundreds of fuel assemblies and complex structural materials such as shrouds / reflectors. Each fuel assembly contains hundreds of different types of cells, such as cells for fuel rods, cells for burnable poison rods, cells for water holes, and so on. On the other hand, the energy distribution of neutrons in a nuclear reactor core ranges from 10 MeV for fission neutrons to 10 MeV for thermal neutrons -2 over a wide range of eV. These two factors make direct calculations for finely described reactors expensive and time-consuming. Restricted by the level of calculation conditions and calculation methods, the one-step calculation of three-dime...

Claims

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Application Information

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IPC IPC(8): G06F30/20
CPCG06F30/20Y02E30/30
Inventor 张斌赵文博刘琨蔡云于颖锐宫兆虎李庆
Owner NUCLEAR POWER INSTITUTE OF CHINA
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