A detector assembly with integrated reactor core measurement function

Abstract

The invention discloses a detector assembly with an integrated reactor core measurement function, which at least includes sequentially arranged connectors, adapter socket pipe welding, adapter packaging pipes, internal sealing joints, component sealing shells, and pressure-bearing shells , bottom fixing sleeve and plug. A wall-attached thermocouple for measuring the temperature of the upper head and the core outlet is installed on the inner wall of the pressure shell; an electric heater is installed in the middle of the pressure shell, and a water level measuring element is installed inside the inner wall of the pressure shell, and the water level measuring element includes A plurality of heating thermocouples and a plurality of non-heating thermocouples arranged at intervals; a plurality of self-powered detectors for measuring the neutron fluence rate inside the reactor core are arranged in the lower section of the pressure-bearing shell. By implementing the invention, by integrating three core measurement functions into an integrated detector assembly, the number of openings in detectors on the top cover of the nuclear reactor pressure vessel can be reduced, thereby improving the safety of nuclear reactor operation.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant reactor core measurement, in particular to a detector assembly with integrated reactor core measurement functions. Background technique [0002] For nuclear power plants of different reactor types, the types of measuring instruments set are different. For example, nuclear neutron and temperature measuring instruments are usually installed in the reactor core of a nuclear power plant to measure the neutron flux of the core and the outlet temperature of the fuel assembly. The measured signals are used to monitor the three-dimensional power distribution of the core, core cooling Reactor operating conditions such as status; at the same time, it is also necessary to measure the water level of the core. [0003] In the prior art, the measurement method of inserting various measurement sensors (such as thermocouples) from the top and inserting the miniature movable fission chamber from the b...

AI Technical Summary

Problems solved by technology

With this measurement method and measuring instrument, it is necessary to open a hole at the bottom of the pressure vessel, so that a large number of through-pipes will be installed, resulting in a decrease in the stiffness of the reactor pressure vessel head, which will increase the risk of reactor coolant leakage and reduce the safety of the reactor design.

[0004] The finger sleeve for measuring the neutron flux rate of the core is inserted from the bottom of the reactor pressure vessel, which is prone to wear at the supporting position of the instrument assembly;

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