Whole energy spectrum neutron radiation damage precise simulation system and algorithm thereof

Abstract

The present invention discloses a whole energy spectrum neutron radiation damage precise simulation system, which mainly comprises a radiation damage nuclear data module, a high energy physical nuclear reaction module and a radiation damage calculation module. The algorithm of the system comprises: 1, inputting a neutron flux and material component or selecting a fixed radiation environment; 2, inputting the neutron flux and material component into a radiation damage nuclear data module and a high energy physical nuclear reaction module, carrying out radiation damage cross section calling and calculation, and generating the neutron radiation damage DPA and the gas generation cross section of a specified nuclide whole energy spectrum; and 3, according to the called or calculated neutron radiation damage cross section in the step 2, inputting into a radiation damage calculation module, combing with the radiation time of the material and the neutron flux and material component, and performing the whole energy spectrum neutron radiation damage precise calculation in any radiation environments. The system of the present invention can completely meet the radiation damage calculation and simulation of a variety of nuclear energy systems.

Description

technical field [0001] The invention relates to the fields of material radiation damage calculation and nuclear reaction theory analysis, in particular to a full-energy-spectrum neutron radiation damage accurate simulation system and an algorithm thereof. Background technique [0002] Fermi once pointed out that "the success or failure of nuclear technology will strongly depend on the behavior of materials under the strong radiation field in the reactor". In the early days, the structure, hydrogenation and perforation of the zirconium alloy cladding caused a large amount of radioactive leakage, which affected the progress of the development of nuclear power plants. In the 1970s, the irradiation density of uranium dioxide fuel caused the bending and damage of fuel rods, which once stopped the operation of nuclear power plants. Until now, fuel rod breakage caused by the interaction between pellets and cladding affects the economics and safety of nuclear power plants, and this...

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Problems solved by technology

However, the following problems exist in the research of radiation damage experiments on materials: high operating costs and high costs; it is difficult to find real operating radiation environments, such as fusion reactors, ADS, etc.; there are large deviations in alternative radiation experiments, so reliable values ​​are used It is particularly important to theoretically calculate the radiation damage and radiation effects of reactor neutrons by means of simulation calculations

However, these programs still have problems such as the limited irradiation environment supported, and the inability to simulate the damage calculation of high-energy irradiation above 20 MeV.

Especially for advanced nuclear energy systems such as accelerator-driven subcritical reactor ADS, the upper limit of neutron energy is as high as GeV, and the radiation damage of structural materials caused by neutrons above 20 MeV is also more serious. The calculation of high-energy radiation damage above 20 MeV will affect the evaluation accuracy of the design life of ADS stack structural materials

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