A device for sealing detection of isolation valves outside containment

Abstract

The invention relates to a device used for sealing detection on a containment outer isolation valve. The isolation valve is arranged on a suction pipeline connected with a containment pit. The device comprises a planar flange (2) connected onto the outer edge of the suction inlet (1-1) of the suction pipeline, and a flange cover (3) arranged at the top of the suction inlet (1-1) of the suction pipeline and connected with the planar flange (2), wherein a testing water injection hole (3-2) and a detecting component connection hole (3-1) are formed in the middle part of the flange cover (3). Through adopting the device provided by the invention, repeated welding and cutting on the suction inlet of the pit are avoided, and damage to the suction inlet of the pit is avoided; when required for testing, the device can be assembled quickly for conducting a test, and can be disassembled quickly after the test, thereby saving time for major repairing; moreover, the device is simple in structure and lower in cost.

Description

technical field [0001] The invention belongs to the technical field of flange connection, and in particular relates to a device for sealing detection of an isolation valve outside a containment vessel. Background technique [0002] In order to deal with breach loss of water accidents and ensure nuclear power plant core cooling and waste heat discharge, nuclear power plants have set up special safety facilities, including emergency core cooling system (or safety injection system) and containment heat removal system (or containment injection system). shower system); the safety injection system injects boron-containing water into the primary circuit of the reactor to compensate for the loss of water in the breach, maintain the water level of the core, and ensure that the core will not be damaged due to temperature rise; the containment spray system is set in The spray nozzles on the top of the containment provide spray water to the containment to discharge the heat in the conta...

AI Technical Summary

Problems solved by technology

This brings two problems. One is that the stainless steel material is only allowed to be cut and welded twice. After two tests, the suction port 1-1-1 of the suction pipe 1 can no longer be welded, otherwise the suction port of the pit will be scrapped. Dangerous; the second is that each test needs to be welded first and then cut, which is time-consuming and labor-intensive, which affects the time for overhaul

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