Nuclear reactor core neutron and temperature detection device

Abstract

Relating to the technical field of nuclear power, the invention provides a nuclear reactor core neutron and temperature detection device, and solves the technical problems of reducing the sensitivitydeviation and improving the service life. The device comprises a plurality of reactor core detection components installed in a pressure vessel, the reactor core detection components are evenly laid along the radial direction of the pressure vessel, and each reactor core detection component includes at least one armored nuclear grade thermocouple thermometer for monitoring the reactor core fuel assembly outlet coolant temperature and multiple vanadium self-powered neutron detectors for monitoring the nuclear reactor core neutron fluence rate, also the vanadium emitters of the vanadium self-powered neutron detectors have an equal length, and the vanadium self-powered neutron detectors are laid from the bottom up in order along the axial direction of the pressure vessel. The device provided by the invention is suitable for a pressurized water reactor nuclear power station reactor core instrument system.

Description

technical field [0001] The invention relates to nuclear power technology, in particular to the technology of a nuclear reactor core neutron and temperature detection device. Background technique [0002] The core instrumentation system of a nuclear reactor includes multiple core neutron temperature detector assemblies. The neutron temperature detector assembly is inserted into the high-temperature, high-pressure and strong-irradiated reactor pressure vessel through the top of the pressure vessel. Through reasonable design, the detector assembly The self-powered detectors in the reactor are arranged along the axial and radial directions of the reactor core, and the three-dimensional neutron fluence rate distribution of the core is monitored online, so as to realize the monitoring of the three-dimensional power distribution of the core. [0003] Another main function of the core instrumentation system is to provide the core outlet coolant temperature signal for the reactor pro...

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Problems solved by technology

[0005] There are mainly two schemes for the existing core neutron measurement detector assembly: 1) Several rhodium self-powered detectors with the same length as the emitter are arranged axially in the instrument bushing assembly. It has the inherent characteristics of low fuel consumption life, its service life is short (about 4 years), and its use cost is relatively high; 2) Several vanadium self-sufficient energy detectors with progressively decreasing emitter lengths are arranged in sequence in the bushing assembly In this scheme, the output current of the vanadium self-sufficient energy detector with decreasing length is used to calculate the axial neutron flux distribution of the reactor core. However, due to the uneven distribution of the axial neutron flux of the core, the detection The fuel consumption of the detector is not uniform, which causes the sensitivity deviation of the detector to become larger, the correction is difficult, and the algorithm is complicated

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