A Digital Differential Pressure Rod Position Measuring Device

Abstract

The invention relates to a digital differential pressure type rod position measuring device, which belongs to the technical field of rod position measurement and control of reactors. The invention is characterized by comprising a differential pressure reference tube, a measuring core rod, n pressure guide tubes, n-1 differential pressure transmitters and an information processing unit, wherein the measuring core rod can reciprocate up and down in the differential pressure reference tube; the pressure guide tubes are arranged at equal intervals, communicated on the side wall of the differential pressure reference tube and used for measuring the coolant flow differential pressure in the differential pressure tube; the differential pressure measurement result signal between every two adjacent pressure guide tubes is output to the information processing unit by the differential pressure transmitter; the opening on the lower end of the differential pressure reference tube is coaxially connected with the opening on the upper end of a control rod guide tube; the lower end of the control rod guide tube is directly communicated to a pressure vessel head of a pressurized water reactor; and after the differential pressure measurement result signal is processed by the information processing unit, and the rod position represented on the upper end face of the measuring core rod can be obtained by identifying the suddenly rising positions of the two pressure guide tube openings. The invention has the advantages of easy manufacture and high reliability.

Description

technical field [0001] The invention belongs to the technical field of reactor rod position measurement and control, and relates to a reactor rod position measurement device, in particular to a digital differential pressure-based rod position measurement device. Background technique [0002] Control rods are an important part of ensuring the safe operation of a reactor. Under normal working conditions, by adjusting the position of the control rods, the normal start-up and shutdown of the reactor can be realized, and the reactor can be maintained at a given power level and the power can be adjusted; under accident conditions, by quickly inserting the control rods Reactor core to achieve emergency shutdown. The rod position measurement device is one of the most important devices in this component, and its reliability and safety are directly related to the normal operation and safety of the entire reactor. [0003] At present, the existing reactor control rod rod position mea...

AI Technical Summary

Problems solved by technology

The problems of this measurement method are: 1. The response speed of the system is slow; 2. The system requires high processing precision and poor interchangeability; 3. It is difficult to verify and calibrate the system

The problem that this measurement method exists is: 1, can not work under the reactor accident state that bubbles are produced in the boiling water reactor and reactor; High installation requirements

The problems of this measurement method are: 1. It is an indirect measurement method and cannot directly measure the position of the control rod; 2. The measuring device has a large volume

The problem with this method is that the volume of the coil is large, the production requirements are high, and the overall measurement device has many leads.

Due to the use of sensors with a large number of coil structures, it is necessary to occupy a large amount of space on the top of the reactor pressure vessel and arrange a large number of lead wires for the rod position measurement device, which not only increases the difficulty of reactor design and structural layout, but also increases the probability of coil failure. Conducive to the safety design of the reactor

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