Ultrasonic monitoring system for the core space of a nuclear reactor

摘要

The present invention relates to nuclear technology and can be used to control the core space condition of a nuclear reactor in which liquid metal coolant is used. The way the ultrasonic monitoring system works is the detection of ultrasonic signals reflected from structural elements in the space (controlled spacing) between the upper level of the fuel assembly head and the lower level of the rotating plug of a nuclear reactor cooled with an opaque coolant (eg liquid sodium). Based on excitation and response testing. The system serves to detect the rotation of the rotating plug in a controlled space (controlled interval) in the transfer operation. In order to increase the reliability of detecting obstacles in the monitored core space and to determine the location of the obstacles, the ultrasonic reflector is configured in the form of a ring in which one or more vertical cylindrical rod rows are arranged, the ring being one of the thermal screens surrounding the reactor core, preferably It is preferably attached to one proximate to the reactor vessel, wherein the spacing at which the cylindrical rods are arranged in rows is less than the spacing between the assemblies.