System and method for monitoring reactor core parameters of nuclear power plant

Abstract

The invention discloses a system for monitoring reactor core parameters of a nuclear power plant. The system comprises measurement assemblies and a signal processing unit, wherein the measurement assemblies comprise multiple first measurement assemblies and multiple second measurement assemblies, each of the first measurement assemblies and the second measurement assemblies comprises multiple self-powered neutron detectors for collecting reactor core neutron-flux density in real time, and the multiple self-powered neutron detectors are distributed in the axial direction and/or radial direction along the periphery of the reactor core of the nuclear power plant; the signal processing unit comprises a reactor core neutron-flux density signal processing cabinet, and is used for receiving reactor core neutron-flux density signals collected by each self-powered neutron detector, processing the reactor core neutron-flux density signals and sending the reactor core neutron-flux density signals to a reactor core online monitoring system, so that the reactor core condition is monitored in real time. According to the system, the integrated measurement assemblies are adopted, so that the space occupied by equipment is reduced, and later maintenance and replacement are facilitated; real-time continuous monitoring for in-reactor neutron flux can be realized, measurement information is more reliable, and the accuracy rate is high.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant core parameter monitoring, in particular to a nuclear power plant core parameter monitoring system and a monitoring method for measuring neutron flux density, temperature and pressure vessel water level in the nuclear power plant reactor core. Background technique [0002] For nuclear power plants, the neutron flux density and temperature of the core and the water level of the pressure vessel are very important parameters, which are closely related to nuclear safety. At present, the core neutron flux monitoring methods include miniature fission chamber detectors, pneumatic floating ball measurement systems, self-powered detectors, etc. [0003] In the existing core parameter monitoring system of nuclear power plants, the movable miniature fission chamber measurement system is generally used to measure the neutron flux of the core. composition. In the movable miniature fission chamber...

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Problems solved by technology

[0005] It can be seen from the above that the core measurement system used in the existing nuclear power plant core parameter monitoring system is large in size and has many components, which is not convenient for installation and later maintenance; due to the use of miniature fission chamber detectors, it can only be carried out periodically and intermittently The neutron flux in the reactor cannot monitor the neutron flux in the core in real time; at the same time, the measuring finger bushing is installed at the lower part of the pressure vessel, which increases the risk of rupture at the bottom of the pressure vessel in a severe accident

In addition, the water level monitoring of the pressure vessel adopts the differential pressure measurement method with a reference tube. This method is an indirect measurement, the measurement accuracy is low, and it is greatly affected by the environment. At the same time, the instrument adjustment process is complicated and inconvenient for later operation and maintenance personnel.

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