Filtering element, filtering unit and nuclear reactor containment recirculation filter

Abstract

The invention discloses a filtering element for filtering water in a nuclear reactor containment recirculation filter. The filtering element comprises a platy main body plate, wherein filtering holes are uniformly formed in the main body plate; a hollow rectangular structure is formed by bending the main body plate along the width direction; the two side edges of the bent main body plate are butted in a clamped manner. Furthermore, the invention further discloses a filtering unit with the filtering element and the nuclear reactor containment recirculation filter. The nuclear reactor containment recirculation filter is provided with a plurality of filtering elements and a plurality of filtering units with the filtering elements, so that the filtering area is greatly enlarged, and the confluence efficiency is greatly improved; under the working condition of a loss of coolant accident, filtering residues can be efficiently and quickly blocked so as to ensure that water collected in a reactor factory can be fully and efficiently filtered and prevent a nozzle on a spraying ring pipe of an EAS system from being blocked as well as prevent a fuel rod supporting barrier from being blocked in the recirculation stage of an RIS system.

Description

technical field [0001] The invention relates to a filter for a nuclear power plant, in particular to a filter element, a filter unit and a nuclear island containment recirculation filter for filtering water collected from a reactor building under accident conditions. Background technique [0002] In the event of a loss of water accident in a nuclear power plant, a large number of thermal insulation fiber fragments and particle fragments will be formed. If these fragments enter the downstream equipment of recirculation (such as various pumps, injection nozzles, and fuel assembly inlet screens), they will cause equipment blockage accidents. The nuclear island containment recirculation filter is usually installed in the annular area of ​​the reactor building, above the suction port of the RIS / EAS (Safe Injection System / Containment Spray System) system pump, and its main function is to submerge The submerged nuclear island containment recirculation filter can efficiently interce...

AI Technical Summary

Problems solved by technology

[0004] This existing nuclear island containment recirculation filter has certain design defects, which affects its performance: some nuclear island containment recirculation filters adopt a horizontal arrangement of filter elements, because a single filter element is directly connected to the pipe connection, and the filter element is not designed to strengthen the structure, the overall strength and shock resistance of the filter element are not ideal; This reduces the difficulty of systematically arranging filters on pits; the filter elements of some filters adopt a polygonal structure, and a single filter element does not process filter holes at the bends, thereby reducing the flow area of ​​a single filter cartridge, and in The bending part is easy to affect the resistance of the fluid inside and outside the filter cartridge; when some filter elements are assembled vertically and horizontally, due to the unreasonable design of the connectors, the assembly process is complicated and the site is restricted by the receiving site, resulting in the assembly process. The resulting filter channel layout is unreasonable and inconvenient for water circulation

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