Nuclear power plant reactor core nuclear instrumentation system

Abstract

The invention discloses a nuclear power plant reactor core nuclear instrumentation system which comprises a fixed multi-segment type self-powered detector, a signal conditioning cabinet and a digitized processing and display device which are connected successively, wherein the fixed multi-segment self-powered detector and the signal conditioning cabinet are arranged in a containment, and the digitized processing and display device is arranged outside the containment. Compared with the prior art, the nuclear power plant reactor core nuclear instrumentation system adopts the fixed type self-powered detector, does not require external power supply, does not require external driving of the detector to be inserted into reactor cores during operation, can real-timely measure the reactor core three-dimensional neutron fluence rate on line, and makes the system easier to maintain; with use of the digitized processing and display device, the system has strong computing and graphic display abilities, can process measured data in real time and generate a reactor core three-dimensional power distribution diagram on line, and achieves optimal control of reactor running and online display of the reactor core three-dimensional power distribution diagram.

Description

technical field [0001] The invention belongs to the field of nuclear power plant operation monitoring, and more specifically, the invention relates to a core instrument system of a nuclear power plant. Background technique [0002] The core instrumentation system of a nuclear power plant generates a three-dimensional core nuclear power distribution map by measuring the neutron fluence rate of the core; using the measured data, the ONIS (Outside Nuclear Instrumentation System, Outside Nuclear Instrumentation System) power range channel calibration can be performed. Nuclear and core fuel assembly burnup assessment, optimal control of reactor operation to ensure the integrity of the fuel cladding and maintain core safety. [0003] The core instrumentation systems of nuclear power plants that have been disclosed are mostly technical solutions based on analog instrumentation and control technology, which have disadvantages such as complex structure, small amount of data processin...

AI Technical Summary

Problems solved by technology

The core instrumentation system works intermittently, at least once every 30 equivalent full power days, and a complete core flux rate measurement takes about 2 hours

[0004] The above nuclear instrumentation system has at least the following disadvantages: 1) The mobile fission detector needs an external power supply to move in the core and is driven by the motor of the selection and drive device 12. The system structure is complex and there are many working links; 2) The mobile fission detector The detector can only work with a single detector at the same time, and a complete core flux rate measurement is time-consuming, and cannot be measured online in real time; 3) The amount of hard-wired communication data transmission is small, the signal anti-attenuation and anti-interference performance is poor, and A large number of cables are required for signal transmission and multiple containment penetrations 200; 4) The three-dimensional power signal of the core cannot be processed and transmitted in real time, the three-dimensional power distribution map of the core cannot be displayed in real time, and the online secondary processing cannot be performed, so the most efficient operation of the reactor cannot be realized. Excellent control; 5) detector or selection and driving device 12 failure needs to replace the detector and select a spare selection and driving device 12, and there are many working links

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