Reactor core physical-thermal coupling simulation method based on multi-physics field framework

Abstract

The invention discloses a reactor core physical-thermal coupling simulation method based on a multi-physics field framework, which can integrate a neutron physical program and a thermal hydraulic program which are not developed based on the multi-physics field framework into the framework to realize physical-thermal coupling calculation under the driving of the multi-physics field framework. The method comprises the following steps: 1, setting a reactor core and calculation time in a neutron physical program and a thermal hydraulic program; 2, establishing a reactor core grid in the multi-physics field framework; 3, calling the neutron physical program by using a multi-physics field framework to carry out steady-state calculation, and transmitting power obtained by calculation; 4, calling the thermal-hydraulic program by using a multi-physics field framework to carry out steady-state calculation, and transmitting thermal-hydraulic parameters obtained by calculation; 5, repeating the step 3 to the step 4 until the fuel temperature converges; 6, calling the neutron physical program to carry out transient neutron physical calculation; 7, calling the thermal hydraulic program to carry out transient thermal hydraulic calculation; and 8, repeating the step 6 to the step 7 to complete calculation of all time periods.

Description

technical field [0001] The invention relates to the field of nuclear reactor core design and safety analysis, in particular to a core physics-thermal coupling simulation method based on a multi-physics field framework. Background technique [0002] A nuclear reactor is a complex system involving multiple physical fields such as thermal hydraulics, neutron physics, and mechanics. It is a multi-scale, multi-physics interaction system. In the past, when the calculation technology was immature and the computer could not meet the real multi-physics field coupling calculation requirements of the nuclear reactor core, the reactor core design and thermal hydraulic safety performance analysis were usually calculated in a decoupled way, that is, when calculating a physical field Conservative assumptions are made for other relevant physics. Although this calculation method can guarantee the conservatism of the calculation results, it also sacrifices the accuracy of the coupling calcul...

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Problems solved by technology

[0004] At present, although many scholars have made many attempts on core physics-thermal coupling calculations based on multiphysics frameworks, there is no general and efficient method to realize neutron physics programs and thermal calculations that are not developed based on multiphysics frameworks. coupled calculation of engineering and hydraulic programs; moreover, in the realized examples of physics-thermal coupling calculations based on the multiphysics framework, it is usually necessary to make major changes to the neutron physics program and thermal-hydraulic program. Two programs need to be started many times, not only the development efficiency is relatively low, but also the efficiency of physics-thermal coupling calculation is reduced

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