Containment sump filter of horizontal pressurized water reactor (PWR) nuclear power plant

Abstract

The embodiment of the invention discloses a containment sump filter of a horizontal pressurized water reactor (PWR) nuclear power plant, which comprises a plurality of filter modules, wherein the filter module comprises a filter cartridge and a collecting slot, the two ends of the collecting slot are opened, the open ends of a plurality of collecting slots are connected in a end-to-end mode so as to form a fluid channel which is communicated with a plurality of pump inlets in the containment sump, and the filter cartridge is fixedly arranged on the top surface of the collecting slot. The containment sump filter is characterized in that the section between the two opposite open ends of the collecting slot of the containment sump filter and the bottom surface which is opposite to the top surface of the collecting slot are arranged in the ring corridor of the containment sump filter. By adopting the containment sump filter of a horizontal PWR nuclear power plant of the embodiment of the invention, turning moment is not produced on the collecting slots, therefore the collecting slots are arranged more stably; the occurrence of the situation that air enters the pump inlets in the containment sump filter by the collecting slots when the water level in the ring corridor of the containment sump filter declines because of leakage can be avoided effectively, thereby not affecting the normal operation of circulating pumps; meanwhile, the containment sump filter is novel in structure and high in safety performance.

Description

technical field [0001] The invention relates to a safety system of a pressurized water reactor nuclear power plant, in particular to a horizontal pressurized water reactor nuclear power plant containment pit filter used in the pressurized water reactor nuclear power plant. Background technique [0002] The pit located at the bottom of the containment vessel of the pressurized water reactor nuclear power plant is used to collect the coolant from the primary circuit in case of major leakage. After a basic accident such as a loss of coolant accident (LOCA) or a main steam line rupture accident (MSLB) in a pressurized water reactor nuclear power plant, the coolant enters the containment pit through the breach, and the coolant will be filtered through the containment pit filter , and then enter the Safety Injection System (RIS) and the Containment Spray System (EAS) through the pump device, and then used for reactor cooling to avoid serious damage to the core and overpressure of ...

AI Technical Summary

Problems solved by technology

[0004] see figure 1 , is a schematic diagram of the installation structure of the pit filter in the prior art, the filter 9 is installed on the ground in the pit ring corridor 6 at the -3.5m layer in the containment pit, and is arranged along the ring corridor 6 to exceed the ring corridor Half of the arc, occupying more than half of the circular arc of the containment pit ring corridor, this type of vertical filter can filter and transport the water mixed with debris to the pump circulation circuit when a basic accident occurs in a pressurized water reactor nuclear power plant To ensure that the safety injection system and the containment spray system perform safety functions, however, the existing vertical containment pit filter 9 has certain structural design defects, such as figure 2 As shown, the filter 9 is mainly composed of a filter 91 and a confluence groove 92. The filter cartridge 91 is parallel to the ground, and its bottom surface is aligned with the openings provided by the confluence groove 92, and fixed with fasteners. The cylinder 91 is suspended in the containment pit, and it will generate a large torque to the confluence tank 92, so it is necessary to support the confluence tank 92 side with a support rod

At the same time, in the circulation phase of the coolant, under normal circumstances, the water level in the containment will remain at a fixed value after it stabilizes, and the sump filter will be completely submerged; however, when the water level in the containment is When the water leaks, the water level will continue to drop, and the filter cartridge 91 and the confluence tank 92 of the pit filter with this vertical structure will be exposed to the air, which will easily cause air to enter the confluence tank 92, endangering the downstream recirculation pump. normal operation

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