Ultrasonic testing device for square-arrangement broken fuel components

Abstract

The invention relates to the technical field of fuel component ultrasonic testing, and particularly discloses an ultrasonic testing device for square-arrangement broken fuel components. An upper-portion guide component for supporting a to-be-tested fuel component is mounted on a bottom plate of a flat plate structure, a probe, a driving mechanism thereof and an emergency escape component are mounted on the bottom plate on one side of the upper-portion guide component, and the probe and a probe part in the driving mechanism thereof can move along the left-right direction of horizontal X axis and the front-rear direction of horizontal Y axis and are used for full-coverage testing of fuel rods in the fuel component; the emergency escape component is fixedly connected with the probe and the driving mechanism thereof and used for separating the probe and the driving mechanism from and moving the same out of a range of the fuel component on the upper-portion guide component. The ultrasonic testing device can realize positioning of the fuel components relative to the same and can realize full-coverage ultrasonic testing of the fuel rods in square arrangement; damage to the fuel rods during two-axis motion is avoided through a torsion limiter and a probe part extensible cylinder.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic inspection of fuel assemblies, and in particular relates to an ultrasonic inspection device for arranging damaged fuel assemblies in a square. Background technique [0002] In the pressurized water reactor nuclear power plant, the nuclear fuel is installed in the thin-walled cladding tube sealed by the end plug. The cladding material is zirconium alloy, and the end plug is welded by electron beam, pressure resistance welding or argon tungsten arc welding. The two ends of the cladding tube, and then several fuel rods are assembled together to form a nuclear fuel assembly. Nuclear fuel assemblies generate heat through fission reactions in the reactor core. It is an extremely important component of a nuclear power plant and the first barrier to prevent nuclear fuel leakage. [0003] my country's M310, ACPR1000 and CPR1000 pressurized water reactor nuclear power plants use AFA-3G fuel assemblies,...

AI Technical Summary

Problems solved by technology

Due to the complexity of the reactor core, harsh operating conditions and high radioactivity, the performance of the cladding material of the fuel assembly will change. If the cladding itself has certain defects, especially at the weld between the end plug and the cladding tube, it will High potential for defect propagation during operation, ultimately leading to failure of nuclear fuel assemblies

Damage to the fuel assembly will directly lead to the entry of radioactive substances into the primary circuit, leading to a sharp increase in the environmental dose and radioactive pollution level of the entire reactor building, or even shutdown, which greatly affects the safe and stable operation of the unit.

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