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Method for calculating radial power distribution of thorium-based mixed oxide fuel

A technology of mixed oxides and radial power, applied in chemical process analysis/design, computational theoretical chemistry, instruments, etc., to achieve accurate nucleon density changes, reduce calculation time, and improve calculation accuracy

Active Publication Date: 2021-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So using the existing UO 2 The radial power model of fuel is obviously not suitable for simulating thorium-based MOX fuel

Method used

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  • Method for calculating radial power distribution of thorium-based mixed oxide fuel
  • Method for calculating radial power distribution of thorium-based mixed oxide fuel
  • Method for calculating radial power distribution of thorium-based mixed oxide fuel

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Embodiment 1

[0062] This embodiment provides a calculation method for the radial power distribution of thorium-based mixed oxide fuel. In the fuel rod, the neutron flux and the change of the inner element of the fuel rod are calculated by using the coupling method of Fick's law and the resonance capture empirical function , including the following steps:

[0063] S1: First pass the formula according to the proposed situation Calculate the initial nucleon density of the fuel in the fuel rod as a prerequisite for processing, where A is the nucleon density of the fuel, ρ is the mass density of the fuel, M is the relative atomic mass of the fuel, and N A is Avogadro's constant;

[0064] S2: Estimate the distribution of the current nucleon density flux based on the total cross section of the fuel rod and the Bessel function;

[0065] In this embodiment, the normalized power distribution factor is calculated through the normalized neutron flux estimated by the Bessel function;

[0066] becau...

Embodiment 2

[0095] This embodiment provides a calculation system for the radial power distribution of thorium-based mixed oxide fuel, including: an initial nucleon density calculation module, a flux distribution calculation module, a nucleon density change calculation module, and a fuel radial power distribution calculation module ;

[0096] In this embodiment, the initial nucleon density calculation module is used to calculate the initial nucleon density of the fuel in the fuel rod;

[0097] Calculate the initial nucleon density of the fuel in the fuel rod, the specific calculation formula is:

[0098]

[0099] Among them, ρ is the mass density of the fuel, A is the nuclear density of the fuel, M is the relative atomic mass of the fuel, and N A is Avogadro's constant.

[0100] In this embodiment, the flux distribution calculation module is used to estimate the distribution of the current nucleon density flux based on the total cross section of the fuel rod and the Bessel function, a...

Embodiment 3

[0130] This embodiment also provides a storage medium, the storage medium can be a storage medium such as ROM, RAM, magnetic disk, optical disk, etc., and the storage medium stores one or more programs. When the programs are executed by the processor, the above-mentioned embodiment 1 is realized. Calculation method for radial power distribution of thorium-based MOX fuels.

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Abstract

The invention discloses a method for calculating radial power distribution of thorium-based mixed oxide fuel, and the method comprises the following steps: calculating neutron flux and nuclide change condition in a fuel rod by adopting a mode of coupling the Fick's law and a resonance capture empirical function, and estimating the flux distribution condition through the Fick's law; and calculating the change condition of the fuel components according to the flux condition and the empirical function. According to the method, a radial power calculation model of the thorium-based mixed oxide is developed based on a traditional UO2 fuel radial power model; meanwhile, the resonance capture self-shielding effect of 232Th and 238U is considered, so the fuel radial power distribution obtained through the method is more accurate.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor power calculation, in particular to a calculation method for radial power distribution of thorium-based mixed oxide fuel. Background technique [0002] During the operation of thorium-based fuel in the reactor, due to 238 Resonant capture of epithermal neutrons by U, 239 The accumulation of Pu on the outer surface of the fuel cladding is significantly larger. This will result in a higher fuel power peak and thus a deeper burnup of the fuel on the fuel surface. This results in a large difference in the radial power distribution of thorium-based fuel from that of conventional uranium dioxide fuel. So using the existing UO 2 The radial power model of fuel is obviously not suitable for simulating thorium-based MOX fuel. At present, mixed oxides mainly based on thorium-based fuels are becoming the focus of research on the development of accident-resistant fuels. Considering that the power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10G16C10/00
CPCG16C20/10G16C10/00
Inventor 刘荣邱晨杰蔡杰进杨锦琛
Owner SOUTH CHINA UNIV OF TECH
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