Measuring experimental device for fission gas leakage after fuel element damage and experimental method thereof

Abstract

The invention discloses a measuring experimental device for fission gas leakage after fuel element damage and an experimental method thereof. The device comprises a water inlet pipe, a lower-part sealing cover, a sealed can, a pumping chamber, a water outlet pipe, two fixing devices, a fuel rod fixing ring, a lifting console, a connection chamber, a fuel rod, a sealing head and a pumping tube, wherein the water inlet pipe is connected with the lower-part sealing cover; the lower-part sealing cover is connected with the sealed can; the fuel rod is placed in the sealed can and fixed by the fuelrod fixing ring; the water outlet pipe is connected with the sealed can; the two fixing devices are used for fixing the entire sealed tank; the sealed tank is connected with the pumping chamber; the pumping chamber is connected with the lifting console through the connecting chamber; and the lifting console is used for controlling the sealing head to go up and down in the pumping chamber. The device has the advantages that the overall structure is simple and easy to process; and a measurement scheme is provided for the study of fission gas leakage characteristics after the fuel element is damaged. The invention also provides the experimental method of the measuring experimental device.

Description

technical field [0001] The invention belongs to the technical field of micro-break gas leakage, and in particular relates to an experimental device and method for measuring fission gas leakage after a fuel element is damaged. technical background [0002] There is a risk of damage to the fuel element cladding under high temperature and strong irradiation conditions. Therefore, during the refueling period of the reactor shutdown, the nuclear fuel assembly will be inspected for damage and leakage by the sipping test, so as to obtain the size of the breakage of the fuel element. When the size of the breakage If it is too large, replace the fuel element. The sipping test is to isolate the fuel assembly in a specified container, rely on the decay heat of the fuel itself or heat it with a heater to make the soluble fission products or fission gas escape, and then extract the sample and analyze it with a radiation detector. Suction devices are mainly divided into online sip device...

AI Technical Summary

Problems solved by technology

However, this method based on heating up to promote the release of fission gas has shortcomings and shortcomings. The measurement time of this method is longer, and it requires a gas circuit and a water circuit, and the device is relatively complicated.

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