A device for online measurement of release pressure of nuclear fuel fission gas

Abstract

The invention discloses a device for measuring the release pressure of nuclear fuel fission gas, which comprises: an outer shell, in which an isolation plate is arranged to divide the inner shell into a fission gas chamber and a regulating air chamber; a nuclear fuel core body and a bellows are arranged in the fission gas chamber, The first end of the bellows is connected to the isolation plate; one end of the connecting rod is connected to the bellows, the other end of the connecting rod is connected to one end of the iron core, and the other end of the iron core extends to the bottom of the regulating air chamber; the bottom of the regulating air chamber is placed in a linear variable differential pressure In the coil of the sensor; the regulating air chamber is provided with an intake pipe and an exhaust pipe. The exhaust gas storage device is connected; the inner cavity of the bellows communicates with the regulating gas chamber through the connection hole on the isolation plate, so as to realize the full range measurement of the fission gas from low pressure to high pressure, and quickly respond to the change of the fission gas pressure, with high measurement accuracy technology Effect.

Description

technical field [0001] The invention relates to the research field of fuel irradiation devices for reactors, in particular to a device for on-line measuring the release pressure of nuclear fuel fission gas. Background technique [0002] Nuclear fuel is an important part of the fuel element. In order to ensure the safety and reliability of the fuel element when it enters the reactor, it is necessary to carry out research on the irradiation behavior of nuclear fuel in the research reactor during the development of the fuel element. [0003] Nuclear fuel will undergo a chain fission reaction in the reactor, and the fission products will have a certain impact on the fuel and the cladding. Among them, a large amount of inert fission gases, such as Kr and Xe, produced by the nuclear fuel element during the irradiation process will cause certain degree of swelling. Swelling will increase with burnup, and at the same time, the interaction between fuel and cladding will become more ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a device for measuring the release pressure of nuclear fuel fission gas, which solves the technical problems that the mechanical compression method has a limited applicable pressure range and the back pressure method has low precision when dealing with continuously changing pressure measurements, and realizes the measurement device The design is reasonable, it can measure the full range of fission gas from low pressure to high pressure, and can quickly respond to the change of fission gas pressure, and the technical effect of high measurement accuracy

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