System for detecting integrity of fuel balls in operation state of high-temperature gas cooled reactor

Abstract

The invention discloses a system for detecting the integrity of a fuel ball in a running state of a high-temperature gas cooled reactor. An outlet in the bottom of a reactor core of the reactor is communicated with a first opening of a surface detection control tee joint through a laser ranging surface imaging device; a second opening of the surface detection control tee joint is communicated with a first opening of the confluence tee joint through the first fuel ball emitter, and the first pneumatic lifting system is communicated with an inlet of the first fuel ball emitter; a second opening of the surface detection control tee joint is communicated with an inlet of a second-stage fuel element integrity detection device, and a broken fuel element outlet of the second-stage fuel element integrity detection device is communicated with a broken ball storage system; a complete fuel element outlet of the second-stage fuel element integrity detection device is communicated with a second opening of the confluence tee joint, a third opening of the confluence tee joint is communicated with the reactor, and the system can be used for detecting the integrity of the fuel balls.

Description

technical field [0001] The invention belongs to the field of nuclear reactor fuel detection and relates to a detection system for the integrity of fuel spheres in the running state of a high-temperature gas-cooled reactor. Background technique [0002] Nuclear fuel elements are the core components that provide fission energy for nuclear reactors. During the fission process, a large number of fission nuclides and induced radionuclides are produced, and most of the radionuclides are enveloped inside the reactor nuclear fuel elements. This layer contains The shell is the cladding layer of the fuel element, usually called the first barrier of the nuclear power plant, and its integrity is an important guarantee for the safety of the nuclear power plant. Integrity testing of nuclear fuel elements in pressurized water reactors has mature experience and methods through on-line radionuclide monitoring and integrity testing of nuclear fuel assemblies in the unloading state. As the wo...

AI Technical Summary

Problems solved by technology

At present, the fuel damage monitoring system designed for high temperature gas-cooled reactors has a single detection method, which can only identify large-scale fractures of fuel elements, but cannot identify small-volume damages (because there are fewer missing parts, which do not affect the flow of fuel spheres). There is a greater chance of error in

If such defective fuel balls continue to flow in the core and the system, the risk of the fuel balls getting stuck in the pipeline (that is, stuck balls) will increase, and the damaged fuel balls will continue to participate in the nuclear fission reaction, and radioactive substances will penetrate Damaged cladding layer increases the radioactivity of the primary circuit

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