Secondary side system for helium mass spectrum leakage detection equipment for heat-transfer pipe of nuclear steam generator

Abstract

The invention discloses a secondary side system of a nuclear steam generator heat transfer tube helium mass spectrometer leak detection equipment, which includes an air source, a helium source, an air distributor for distributing the air provided by the air source, and a The injection cabinet that injects the air provided by the air distributor into the secondary side and mixes the air provided by the air distributor with the helium gas provided by the helium source to output the mixed gas, and distributes the tracer gas output from the injection cabinet Distributor, upper manhole flange cover / eye hole flange cover and hand hole flange cover for sealing the upper manhole / eye hole and hand hole respectively. The invention can stir the gas charged into the secondary side, so that the helium gas is evenly distributed, and prevent water vapor from condensing; it can mix air and helium gas according to a certain ratio, and can monitor the pressure in real time while ensuring the sealing of the secondary side , temperature, dew point temperature, helium concentration and other physical quantities to ensure that the detection environment is effective.

Description

Technical field [0001] The invention relates to the field of nuclear power non-destructive testing, in particular to a secondary side system of a helium mass spectrometer leak detection device for a heat transfer tube of a nuclear steam generator. Background technique [0002] The volume of the secondary side of the steam generator is large. If pure helium is used for testing, on the one hand, the cost is higher, and on the other hand, it takes longer to fill helium with a helium cylinder; at the same time, the steam generator is located in a closed nuclear island. The filled pure helium leaks into the environment, and there is a greater risk of suffocation. Steam generator helium leak detection takes a long time, and the mixed gas on the secondary side is left for a long time. On the one hand, helium will move upwards and gather on the top, which will cause different helium concentrations at different heights of the heat transfer tube, which will affect the measurement results. ...

AI Technical Summary

Problems solved by technology

The helium leak detection of the steam generator takes a long time, and the mixed gas on the secondary side has been left standing for a long time. On the one hand, the helium will move upward and gather at the top, which will cause different helium concentrations at different heights of the heat transfer tube and affect the measurement results. ; On the other hand, the water vapor will move downward and gather at the bottom, which may form condensed water on the heat transfer tube wall and block the possible leak hole

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