Heat transfer analysis method and device after submerged criticality

Abstract

The disclosure belongs to the technical field of nuclear power maintenance, and in particular relates to a heat exchange analysis method and device after reflooding criticality. The disclosed method removes the foaming area near the quenching front from the post-critical heat transfer area, avoids the complex heat transfer mechanism of the foaming area, and interferes with the heat transfer analysis of other areas downstream of the quenching front, which is beneficial to be more reasonable The analysis of the heat transfer in the area downstream of the foaming area near the quenching front. In addition, the embodiment of the present disclosure subdivides the area downstream of the foaming area near the quenching front into multiple sub-areas, and determines the heat transfer amount of the sub-area according to the heat transfer mode of each sub-area, thereby enabling more detailed simulation Post-critical heat transfer to more accurately simulate the peak cladding temperature and quench front advance rate during reflooding. The heat transfer analysis method after critical resubmersion of the present disclosure is applied in the development process of China's independent loss of water accident analysis program, laying a foundation for the analysis of water loss accidents in pressurized water reactor power stations.

Description

technical field [0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a heat exchange analysis method and device after resubmergence criticality. Background technique [0002] The reflooding process of a nuclear power plant loss of water accident is a very important stage of a local nuclear power plant accident. The reflooding process involves a complex two-phase flow heat transfer process. Therefore, a large number of experimental studies and model studies have been carried out at home and abroad in recent decades to explore the reflooding process. The complex flow heat transfer in the process, and developed large-scale system programs such as RELAP5, CATHARE, COBRA-TF, etc. to simulate the reflooding process of the loss of water accident. [0003] Compared with the general two-phase flow heat transfer conditions, the reflooding process is special, mainly reflected in the characteristics of low pressure and low flow c...

AI Technical Summary

Problems solved by technology

Due to the above factors, the post-critical heat transfer model in the current LOCA analysis and simulation has relatively large simulation errors for post-critical heat transfer after reflooding, so it is urgent to improve the accuracy of the simulation of post-critical heat transfer after reflooding

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