Three-dimensional transient performance analysis method for supercritical water reactor core

Abstract

The invention discloses a three-dimensional transient performance analysis method for a supercritical water reactor core. The three-dimensional transient performance analysis method comprises the steps that 1, reactor core steady-state calculation is executed, power parameters and thermal engineering parameters are provided, and iterative coupling calculation is executed till reactor core steady-state power parameters and the thermal engineering parameters are constricted; 2, a reactor core initial state and an assembly cross section library are provided; 3, transient calculation is executed, the power parameters and the thermal engineering parameters are provided, iterative coupling calculation is executed till the reactor core steady-state power parameters and the thermal engineering parameters are constricted; 4, fine power distribution of dimension of thermoelement cells is obtained, thermoelement channel analysis is conducted, and finally safety evaluation key parameters are given; 5, whether the safety evaluation key parameters exceed the corresponding transient or accident safety limit or not is judged, feedback between physics and thermal-hydraulic power can be accurately described, precise reactor core three-dimensional power distribution is provided, and the technical effect of the transient process and the accident process of a supercritical water reactor are stimulated truly.

Description

technical field [0001] The invention relates to the field of nuclear reactor design research, in particular to a three-dimensional transient performance analysis method for a supercritical water reactor core. Background technique [0002] The operating condition of the supercritical water reactor (SCWR) is above the thermodynamic critical point of water (374°C, 22.1MPa), the thermal efficiency of the system is high, and the economy is good, but at the same time, compared with the conventional water-cooled reactor, the operating parameters of the supercritical water reactor The core structure and coolant flow are relatively complex, which brings a lot of technical problems such as core physics, thermal-hydraulic and safety analysis. Among them, the strong nuclear thermal coupling characteristic is the core design and core of supercritical water reactor. One of the key technical problems of performance analysis. [0003] Among the abnormal reactivity events of supercritical w...

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Problems solved by technology

[0007] The invention provides a three-dimensional transient performance analysis method for supercritical water reactor core, which solves the problem that the existing supercritical water reactor power distribution transient analysis method does not have the ability to calculate three-dimensional power coupled with core core heat, and it is difficult to real or Accurately simulate the technical problems of transient processes such as reactivity and abnormal power distribution events, realize the accurate description of the feedback between physics and thermal-hydraulic, provide more accurate three-dimensional power distribution of the core, and truly simulate supercritical Transient Process of Water Reactor and Technical Effect of Accident Process

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