A test section for studying burst failure of annular fuel cladding

Abstract

The invention discloses a test section for studying the cladding blasting failure of annular fuel. The test section comprises inner and outer cladding tubes of the annular fuel element, an electric heating element inside the cladding tubes, a sealing gland and a supporting base at the two ends of the cladding tubes, a high-temperature and high-pressure gas inlet in the upper end of the cladding tubes, a cylindrical chamber outside the cladding tubes, an O-shaped sealing ring at the bottom of the cylindrical chamber, an ambient gas inlet in the bottom of the cylindrical chamber, a gas outlet inthe top of the cylindrical chamber, and temperature and strain measuring devices of the inner and outer cladding tubes. Through the electric heating element inside the fuel element, the deformation and blasting of the inner and outer cladding tubes are realized; through the cylindrical chamber, a gas environment on the outer side of a cladding is provided, and high-temperature and high-pressure gas injected outwards after rupture of the cladding tubes is contained; through the gas inlet in the upper end of the cladding tubes, inert gas or steam is introduced into the annular cladding tubes tochange the internal pressure of the cladding tubes; through temperature measuring points, strain gauges and DIC devices, parameter detection after the blasting failure is realized.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel and material performance testing, and in particular relates to a test section for studying blast failure of annular fuel cladding. Background technique [0002] As an innovative element, annular fuel can increase the power density of the reactor by 20% to 50% on the premise of maintaining or improving the safety margin of the existing reactor. Therefore, it is a new type of fuel with good safety and economy. Nuclear fuel has become one of the important development trends of advanced fuel elements in PWRs. Under transient accident conditions such as loss of coolant (LOCA), the temperature of the cladding will increase sharply, and the high temperature and high pressure will deform the cladding of the fuel element, resulting in swelling of the cladding and eventually a breach. Therefore, new annular fuel elements need to undergo a large number of performance tests before they can be used comme...

AI Technical Summary

Problems solved by technology

This experimental system can realize the research on the blasting failure of the rod-shaped cladding tube, but it cannot simulate the gas environment on the inner and outer surfaces of the annular fuel element cladding, and cannot realize the deformation measurement of the inner and outer surfaces of the annular cladding

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