Post-irradiated fuel rod vacuum bubble method leak detection box, leak detection system and leak detection method

Abstract

The invention discloses a fuel rod vacuum bubble method leak detection box after irradiation, a leak detection system and a leak detection method thereof. After irradiation, the fuel rod is dried by a baking device, placed on an L-shaped lifting frame, and then lowered into the leak detection box In the water, a vacuum is drawn inside the leak detection box to generate a pressure difference inside and outside the fuel rod. If the fuel rod is damaged, bubbles will be formed around the damaged opening. The position of the bubble generation is determined by image acquisition, thereby completing the inspection of the irradiated fuel rod. leak detection. This set of device leak detection has the advantages of fast detection speed, simple operation in the hot chamber, good economy, etc., simple structure, low cost, remote manipulator operation, safe structure, no excessive structure contacting fuel rods, making the breach as possible Appears to increase the leak detection rate of fuel rods.

Description

technical field [0001] The patent of the present invention relates to a fuel rod leak detection treatment structure and treatment method. Background technique [0002] At present, the leak detection of fuel rods after irradiation mainly adopts three methods: vacuum bubble method, water boiling method and pressurized method. The water boiling method changes the internal and external pressure difference of the fuel rod by heating water. Due to the limitation of the boiling point of water, the generally generated pressure difference is about 0.2 atm, and the detection sensitivity is relatively low, so it is rarely used. The pressurization method presses the reference gas into the fuel rod through the damaged port or special hole through the pressurization device to change the pressure difference between the inside and outside of the fuel rod. However, this method requires high sealing performance, is difficult to install, and is difficult to be widely used. For a large number ...

AI Technical Summary

Problems solved by technology

The water boiling method changes the pressure difference between the inside and outside of the fuel rod by heating water. Due to the limitation of the boiling point of water, the pressure difference generally produced is about 0.2 atm, and the detection sensitivity is relatively low, so it is rarely used.

The supercharging method uses the supercharging device to press the reference gas into the fuel rod through the damaged port or a special hole to change the pressure difference between the inside and outside of the fuel rod. However, this method requires high sealing performance, is difficult to install, and is difficult to be widely used.

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