System and method for online monitoring of integrity of lead-bismuth reactor fuel element can

Abstract

The invention provides a system for online monitoring of the integrity of a lead-bismuth reactor fuel element can. The system comprises a delayed fission neutron detection unit which is used for monitoring and acquiring data of a delayed fission neutron fluence rate in real time, a characteristic fission nuclide detection unit which is used for monitoring and acquiring data of characteristic fission nuclide radioactivity and a back-end data centralized processing unit, wherein the back-end data centralized processing unit has the functions of automatic alarm and output of an evaluation conclusion report, and is used for receiving the data of the delayed fission neutron fluence rate and the data of the characteristic fission nuclide radioactivity, comparing the data with preset corresponding thresholds, and giving a comparison conclusion. Through the online monitoring system, automatic and real-time evaluation of the integrity of the lead-bismuth reactor fuel is achieved, and the data is monitored and acquired through the delayed fission neutron detection unit and characteristic fission nuclide detection unit simultaneously, and is verified through the data centralized processing unit, so that the reliability of on-line integrity evaluation of the lead-bismuth fuel is improved greatly, and the system can also be used for guiding shutdown leakage tests.

Description

technical field [0001] The invention relates to the technical field of reactor leakage monitoring, in particular to an on-line monitoring system and method for the integrity of the fuel element cladding of a lead-bismuth reactor. Background technique [0002] Fuel element cladding is the second of the four safety barriers in nuclear power plants, and undertakes the task of containing the fission products of fuel pellets. If the fuel element cladding is damaged, the fission products will be released into the primary coolant through the breach, which will have a potential impact on the safe operation of the nuclear power plant. It is of great contribution to the safe and economical operation of nuclear power plants to timely and accurately determine whether the fuel element cladding is damaged, the size of the breakage and the location of the breakage during operation. After the fuel element cladding is damaged and the reactor is shut down, the fuel rod cladding must be leak ...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide an online monitoring system and method for the integrity of the cladding of lead-bismuth stack fuel elements, which can improve the problem that the existing monitoring system or method cannot realize continuous monitoring and the diagnosis conclusion is non-mechanistic

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