Abstract
The casting quality of the coolant pump casing of the nuclear power plant reactor is directly related to the operational reliability and safety of the nuclear main pump, and plays a key role in the integrity of the pressure-bearing boundary of the reactor primary loop. In this paper, aiming at the low impact performance of the sample during the casting process of the main pump casing of a nuclear power plant, through using failure analysis tools like fishbone diagram from multiple dimensions such as material selection, design and technology, melting analysis, pouring process, riser design, and heat treatment process, and combining with metal macro-fracture analysis and micro-electron microscopy scanning methods for cause analysis, finally, it was found that the basic reason for the low impact performance of the pump shell is that the secondary inclusions appear on the fracture of the sample during the solidification of the molten steel. Using test-retest inspection and finite element mechanics simulation analysis, the comprehensive evaluation of the impact performance of the sample was obtain, which provides an effective solution for the analysis and evaluation of casting inclusions in water pumps of nuclear power plants, and also provides an important reference for the structural optimization and equipment research and development of water pump equipment of nuclear power plants.
Highlights
Nuclear power plant reactor coolant pump, located between the primary loop reactor and steam generator, is one of the pressure boundaries and key equipment of the reactor coolant system, and it is the only high-speed rotating equipment in the primary loop main system, of which main function is to drive the cooling medium of the reactor's primary circuit [1]
Due to the complex casting process and difficult process quality control, special attention should be paid to the rationality of the melting process, pouring system, riser design, and heat treatment during the casting process to avoid shrinkage, loosen and other defects, effectively control inclusions
This paper adopts an analysis method that combines theory and engineering practice to conduct an in-depth analysis of the inclusion problems in the casting process of the main pump casing of the nuclear power plant, and provides an efficient solution and reference for the casting quality control, process improvement and the development of large casting products for the main pump shell
Summary
Nuclear power plant reactor coolant pump (referred to as "main pump"), located between the primary loop reactor and steam generator, is one of the pressure boundaries and key equipment of the reactor coolant system, and it is the only high-speed rotating equipment in the primary loop main system, of which main function is to drive the cooling medium of the reactor's primary circuit [1]. As the pressure boundary of the primary circuit system, the pump casing has high technical requirements in terms of design pressure, service life, and seismic requirements. Due to the complex casting process and difficult process quality control, special attention should be paid to the rationality of the melting process, pouring system, riser design, and heat treatment during the casting process to avoid shrinkage, loosen and other defects, effectively control inclusions. This paper adopts an analysis method that combines theory and engineering practice to conduct an in-depth analysis of the inclusion problems in the casting process of the main pump casing of the nuclear power plant, and provides an efficient solution and reference for the casting quality control, process improvement and the development of large casting products for the main pump shell
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