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Nuclear power plant generator whole air tight test method

An air-tight test and generator technology, which is used in the use of liquid/vacuum for liquid-tightness measurement, and by detecting the appearance of fluid at the leak point. The effect of improving test accuracy, improving leak detection accuracy and continuous monitoring capability, and improving data accuracy

Active Publication Date: 2013-05-08
CHINA GENERAL NUCLEAR POWER CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an overall airtight test method for nuclear power plant generators with a short construction period and high test accuracy in view of the defects of long airtight test period and low test accuracy in the prior art

Method used

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  • Nuclear power plant generator whole air tight test method
  • Nuclear power plant generator whole air tight test method
  • Nuclear power plant generator whole air tight test method

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Effect test

Embodiment 1

[0056] Embodiment 1, the overall airtight test method of the generator of nuclear power plant is to charge gas into the generator and the hydrogen system to boost the pressure to the working pressure and maintain the pressure, and monitor the gas temperature, pressure and ambient atmosphere inside the generator during the pressure maintenance process. pressure, detect leaks and treat leaks. Before filling the generator and the hydrogen system with gas and during the pressurization process, it also includes the temperature control operation steps to maintain the equilibrium temperature inside the generator and the gas leakage caused by the air-side and hydrogen-side seal oil leakage. The operation steps of preventing oil spillage also include the liquid level monitoring step of the sealed oil tank during the pressure maintaining process; the monitoring and recording time of the gas temperature, pressure, ambient atmospheric pressure and the liquid level of the sealed oil tank in...

Embodiment 2

[0111] Embodiment 2, the overall airtight test method of the generator of nuclear power plant, charge the gas into the generator and the hydrogen system as a whole to increase the pressure to the working pressure and maintain the pressure, and monitor the gas temperature, pressure and ambient atmosphere inside the generator during the pressure maintenance process pressure, detect leaks and treat leaks.

[0112] Before filling gas into the generator and the hydrogen system, implement pure helium pressure to check for leaks and repair the parts that can be isolated separately.

[0113] In the airtight test, the gas that needs to be charged into the generator and the hydrogen system is a mixed gas of air and helium; the volume concentration of helium in the mixed gas is 15-18%. Since helium is an important condition in the airtight test, the detection accuracy of helium is very high, and the theoretical value of the detection concentration range of the helium mass spectrometer ca...

Embodiment 3

[0123] Embodiment 3, the overall airtight test method of the generator of nuclear power plant, charge gas into the generator and the hydrogen system as a whole to increase the pressure to the working pressure and keep the pressure, and monitor the gas temperature, pressure and ambient atmosphere inside the generator during the pressure keeping process Pressure, detect leaks and deal with leaks, before filling the generator and hydrogen system with gas and during the pressure holding process, it also includes the temperature control operation steps for maintaining the equilibrium temperature inside the generator, during the pressure holding process The gas temperature, pressure, ambient atmospheric pressure and liquid level of the sealed oil tank are monitored and recorded every 20 to 40 minutes. End the test when the leakage rate meets the predetermined requirements for a continuous time greater than or equal to 24 hours.

[0124] In this embodiment, before the airtight test, ...

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Abstract

The invention belongs to the key technical field of million kilowatt level advanced pressurized water reactor nuclear power plants, and discloses a nuclear power plant generator whole air tight test method. The test method includes that gas is inflated into a generator and a hydrogen system, the pressure is increased to working pressure to be maintained, a leakage point is detected to be handled, the test can be finished when pressure maintaining time of leakage rate meets a predetermined requirement and is larger than or equal to 24 hours, and mixed gas of air and hydrogen is inflated to the generator and the hydrogen system. The test method further comprises a temperature control operating step and an anti-oil-swapping operation step, wherein the temperature control operating step is used for maintaining balanced temperature inside the generator, and the anti-oil-swapping operation step is used for controlling swapping of sealing oil on the airside and the hydrogen side not to cause gas leakage. The test method further comprises sealing oil tank liquid level monitoring step in the process of pressure maintaining. Recording duration for monitoring of gas temperature, pressure, ambient atmosphere pressure and sealing oil tank liquid level inside the generator is every 20-40 minutes in the process of the pressure maintaining. The nuclear power plant generator whole air tight test method is short in time limit for construction and high in test precision.

Description

technical field [0001] The invention belongs to the key technical field of a million-kilowatt advanced pressurized water reactor nuclear power plant, and relates to an airtight test method, in particular to an overall airtight test method for a nuclear power plant generator. Background technique [0002] With the continuous improvement of power generation capacity of nuclear power plants, the control of the overhaul period is becoming more and more stringent. The overall airtightness test of the generator is to perform a pressure test on the generator body and related hydrogen system before the unit is put into operation after each maintenance, to verify the integrity of the entire boundary. The test process is to first pressurize to the working pressure and maintain the pressure, and then maintain a stable state as much as possible, detect various data, and calculate the gas leakage rate per day. When the pressure-holding time reaches the manufacturer's design standard, the...

Claims

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Application Information

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IPC IPC(8): G01M3/20G01M3/06
Inventor 贾凯利吴粉山黎志政蒋达进孙永刚柴伟东张大勇段宪东洪益群陈杰郭嘉文边守利冯永军房志强刘东海
Owner CHINA GENERAL NUCLEAR POWER CORP
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