Sealability testing method of insulation valve of separating piece of cooling water system of main pump of nuclear power station

Abstract

The invention discloses a sealability testing method of an insulation valve of a separating piece of a cooling water system of a main pump of a nuclear power station. The sealability testing method of the insulation valve of the separating piece of the cooling water system of the main pump of the nuclear power station comprises steps as below: a first penetrating piece (201) and a second penetrating piece (202) are enabled to be a passageway through operations. A testing device is connected at a first joint (1) and a pressure gauge is connected at a second joint (2) to guarantee the passageway. The first joint (1) is pressurized through the testing device, and the sealability of a sixth valve (023), a seventh valve (007) and an eighth valve (002) are detected by reading the indication numbers of a flow meter on the testing device. The sealability testing method of the insulation valve of the separating piece of the cooling water system of the main pump of the nuclear power station is capable of reducing transporting times of a device, reducing number of joints for connecting pipelines, reducing the risk of running water, preventing expansion of radiant pollutions, shortening working hours of tests, increasing benefits, reducing radiation safety risks and industrial safety risks.

Description

technical field [0001] The invention belongs to the field of detection of nuclear power plants, and specifically refers to a method for testing the tightness of an isolation valve of a penetrating part of a cooling water system of a main pump of a nuclear power plant. Background technique [0002] The leak test method for the penetration isolation valve of the cooling water system of the main pump of the nuclear power plant (hereinafter referred to as the penetration test) is an important means to verify the integrity of the third safety barrier and an important test related to quality and nuclear safety. Therefore, the power plant and related parties Take it very seriously. [0003] The isolation valve tightness test of the main pump cooling water system (hereinafter referred to as RRI system) is part of the penetration test. During the test, due to objective factors such as heavy workload, narrow test site space, geographical location, and environmental dose, using tradit...

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Problems solved by technology

From the above description, it can be seen that the working process is cumbersome and heavy, so the whole test time will last about 9 hours, so there is a risk of personnel fatigue operation

[0013]2. The exposure level of test personnel is relatively high, and there are safety risks such as water leakage and contamination

The test personnel need to enter and exit the room many times for plugging and unplugging of test pipelines, verification of test results, and observation of pressure gauges, so the exposure level of test personnel is relatively high (the average absorbed dose per capita is about 300μSv during the whole test process)

[0015]2.2. Due to the repeated plugging and unplugging of the test pipeline, there is a risk of water leakage, causing the risk of pollution diffusion, and may even cause the risk of contamination of personnel and equipment

[0016]3. There is a risk of test quality accidents

[0019]1. The system equipment is relatively scattered, with 0 meters, 5 meters, 11 meters and 16 meters;

[0020]2. Basically use water as the medium for the test, unless it is emptied for maintenance, the test tank containing water is heavy, and the space inside the nuclear island is relatively narrow, making it inconvenient to carry ;

[0021]3. The connection test pipeline is long, which is prone to water run-off, pipeline leakage, and the risk of contamination;

[0022]4. Personnel repeatedly go up and down the stairs and are prone to fatigue, resulting in industrial safety risks;

[0023]5. Long working hours increase the exposure dose of personnel

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