Nuclear fuel failure detection device and method

Abstract

The invention provides a nuclear fuel failure detection device. The device comprises a lead shielding case, a sampling chamber, a gas inlet pipe, an gas outlet pipe, a main detector, a scintillation detector A, a scintillation detector B, a collimator A, a collimator B, a photomultiplier, a pre-amplifier, a linear amplifier, an anticoincidence counting circuit, a gate circuit, an impulse amplitudeanalysis meter, a comprehensive analysis instrument, a data processor and a display screen. A nuclear fuel failure detection method is used in the nuclear fuel failure detection device. By means of the nuclear fuel failure detection device, the concentration of 133 Xe gamma rays in tail gas of a reactor condensation system can be measured on line, and therefore, whether nuclear leakage occurs ornot is judged, and the leakage rate is calculated; the interference of 13N annihilation gamma rays with a measurement result is eliminated through the scintillation detectors and the anticoincidence counting circuit; the interference of Compton trails of the 133 Xe gamma rays with the measurement result is eliminated through the impulse amplitude analysis meter. The measurement result is accurate,reliable and high in precision.

Description

technical field [0001] The invention relates to the field of detection devices, in particular to a nuclear fuel damage detection device and detection method. Background technique [0002] As the core components of nuclear power plant reactors, nuclear fuel elements are easily damaged under harsh service conditions such as high temperature, high pressure, and high density. In order to ensure the safe operation of the reactor, nuclear fuel elements must be monitored by various means during the process from processing, production to service, to ensure their quality and safety. [0003] Judging from the domestic research status, most of the research in this area in my country is still in the offline monitoring stage, and the research on the monitoring of nuclear fuel elements in online operation is relatively scarce. Most of the domestic nuclear fuel element damage monitoring uses the following technologies: [0004] 1. Conventional monitoring methods such as X-ray, ultrasonic ...

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Problems solved by technology

[0006] 1. These two techniques are usually only used to judge whether a leak occurs, but cannot accurately judge the amount of leakage. If used to judge the amount of leakage, the detection results are easily affected by the background radiation of the outside world (the background radiation is mainly 13 The 511kev annihilation gamma ray emitted by N) interferes and loses alignment

[0007] 2. These two technologies are usually only used for offline detection (that is, samples need to be sent to the laboratory for detection) whether a nuclear leak occurs, and there is a detection lag

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