A Radial Deformation Measurement System of Nuclear Fuel Cladding Tube in High Temperature Iodine Vapor Environment

Abstract

The invention discloses a measuring system for radial deformation of a nuclear fuel cladding tube under high temperature iodine vapor environment. The measuring system for the radial deformation of the nuclear fuel cladding tube under the high temperature iodine vapor environment includes a cladding tube, double layer airtight hot chambers for placing the cladding tube, a sealing cover and a sealing base which are arranged at the two ends of the cladding tube, a cylindrical cavity of the upper layer hot chamber, an electronic stretcher extending to the cladding tube, a loading sensor installedon a push rod of the electronic stretcher and a temperature sensor arranged at the bottom of the cladding tube. The measuring system further includes a laser displacement sensor, an air inlet tube and an air outlet tube, and the laser displacement sensor, the air inlet tube and the air outlet tube are arranged outside of visual glass of the two sides of the lower hot chamber. The electronic stretcher is subject to axial compression and radial expansion in the cladding tube, and iodine vapor flow through the cylindrical cavity and the cladding tube. The measuring system for the radial deformation of the nuclear fuel cladding tube under the high temperature iodine vapor environment can reliably and effectively realize the measurement of the radial deformation of the cladding tube under thehigh temperature iodine vapor environment. Steady temperature required by the cladding tube is provided by using the hot chambers. Only iodine vapor environment of inner surface of a cladding is realized by using various sealing technologies. The measurement of the radial deformation of the cladding tube is realized through the laser displacement sensor by using the visual glass of the two sides of the lower layer hot chamber.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel and material performance testing, and in particular relates to a radial deformation measurement system of a nuclear fuel cladding tube in a high-temperature iodine vapor environment. Background technique [0002] Zirconium alloys have the advantages of low neutron absorption cross section, excellent corrosion resistance and mechanical properties, and are widely used as nuclear power reactor fuel element cladding and other reactor internal components. New commercial fuel rod cladding tubes must fully understand the performance of zirconium alloy cladding tubes before they are put into the stack, so it is necessary to carry out tests of various performance indicators, such as corrosion, hydrogen absorption, mechanics, etc. The mechanical properties of the cladding tube under high temperature iodine vapor environment is an important item in the test. [0003] With the increasing research on the...

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Problems solved by technology

This system realizes the high-temperature iodine vapor environment, but it cannot simulate the iodine vapor environment on the inner surface of the cladding in a real reactor, nor can it achieve high-precision real-time measurement of cladding tube deformation

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