Air bag plugging device for explosion valve maintenance

Abstract

The invention relates to the field of explosion valve maintenance, in particular to an air bag plugging device for explosion valve maintenance. An AP1000 pressurized water reactor nuclear power plant is provided with an explosion valve on RCS and PXS systems such as an automatic pressure relief system, low-pressure safety injection and containment recirculation, the section of pipeline cannot be normally isolated in the refueling overhaul period of the power plant, and the system has radioactivity. A reliable isolation device needs to be designed to achieve isolation under the condition that a system is not emptied, and then explosion valve overhauling work is conducted. The device comprises an air bag, a sealing assembly, an inflation and deflation assembly and a drainage pipeline. The air bag and sealing assembly comprises an air bag rubber body, an outer locking nut, a pull rod, an anti-leakage flange, an inner locking nut, a front flange, a rear flange, a flange cover plate and a drainage hole. According to the device, the explosion valve can be overhauled under the condition that the pipeline is not emptied.

Description

technical field [0001] The invention relates to the field of burst valve maintenance, in particular to an airbag blocking device for burst valve maintenance. Background technique [0002] AP1000 pressurized water reactor nuclear power plant is equipped with blasting valves on RCS and PXS systems such as automatic pressure relief system, low pressure safety injection and containment recirculation, among which 4 are ADS fourth-stage 14-inch blasting valves and 4 containment recirculation 8-inch burst valve for pipeline and 4 sets of 8-inch burst valve for IRWST injection pipeline. These burst valves mainly perform safety-related functions under accident conditions. One burst valve of each category needs to be taken out for dismantling in each refueling cycle. Inspection items, since this section of the pipeline cannot be normally isolated during the refueling overhaul of the power plant, and the system is radioactive, a reliable isolation device needs to be designed to achieve...

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Problems solved by technology

[0005] In order to carry out the maintenance work of the blasting valve smoothly, the invention provides an air bag sealing device for the maintenance of the blasting valve of the AP1000 nuclear power plant, aiming at the problem that the pipe section of the blasting valve cannot be normally isolated during the refueling period of the overhaul of the power plant, and is used for the blasting valve When dismantling and overhauling, it replaces the sealing of the flange blind plate. After the upstream and downstream pipelines of the blasting valve are frozen and sealed with ice plugs, then use this device to isolate the upstream / downstream pipelines of the dismantled blasting valve. After confirming correct installation and isolation, stop supplying liquid ammonia , Remove the ice plug to protect the pipeline, and finally realize the maintenance of the blasting valve under the condition that the pipeline is not emptied

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