Reactor core measurement sensor based on self-powered detector and thermocouple

Abstract

The invention discloses a reactor core measurement sensor based on a self-powered detector and a thermocouple. The reactor core measurement sensor at least comprises a connector, an adapter socket pipe welding part, an adapter packaging pipe, an internal sealing joint, an assembly sealing shell, a pressure-bearing shell, a bottom fixing sleeve and a plug which are arranged in sequence. A pluralityof self-powered detectors are arranged in the pressure-bearing shell and spirally ascend from bottom to top by taking the central axis of the reactor core as an axis; the tail part of each self-powered detector is connected with a tail part fixing wire which is connected with the bottom fixing sleeve, so that the self-powered detectors are positioned, and the accuracy of a reactor core neutron fluence rate measurement result and a reactor core power density distribution monitoring result is ensured; meanwhile, a thermocouple heat conduction block structure is arranged in the pressure-bearingshell, so that the thermocouple is in close contact with the assembly shell, the heat transfer efficiency of the thermocouple and a reactor core outlet coolant is improved, the measurement sensitivityof the thermocouple to the reactor core temperature is further improved, the response time is shortened, the measurement precision is improved, and safe operation of the reactor is ensured.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant reactor core neutron flux and temperature measurement, in particular to a core measurement sensor based on a self-powered detector and a thermocouple. Background technique [0002] Usually, in the reactor core of a nuclear power plant, core neutron and temperature measuring instruments are installed 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, the cooling state of the core, etc. Reactor operation. [0003] For nuclear power plants of different reactor types, the types of measuring instruments set are different. In the prior art, the general measurement method is to insert a thermocouple from the top and a miniature movable fission chamber from the bottom to measure the outlet temperature of the fuel assembly and the neutron flux of the core, such a...

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Problems solved by technology

[0005] At the same time, the operability of the current equipment is poor and the measurement accuracy of different parameters of the core is not high enough

The self-powered detector as a neutron detector and the cable-type thermoelectric converter as a temperature detector are not strictly fixed, which also leads to errors in the measurement of neutron flux and temperature

In addition, during the operation of the component, the detector may change its original position, which will also lead to a decrease in measurement accuracy

[0006] The current core neutron and temperature measurement detector assembly has some expensive components with low utilization rate, which cannot give full play to the role of this component in the neutron flux and temperature measurement process; if a component fails, it will cause The loss of core state information measured by the entire measurement assembly makes it difficult to inspect the internal state of the nuclear reactor vessel in order to best handle severe accidents and establish active and effective accident handling decisions

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