Method for integrally winding pressurized-water reactor nuclear power plant winding connectionless point stick location probe coil

Abstract

The invention belongs to the field of pressurized water reactor nuclear power plants and particularly discloses a pressurized water reactor nuclear power plant control rod position detector coil overall winding method, which comprises the following steps: (1) using an NC winding machine wind out the primary windings at one time; (2) setting the start-up circle number and winding speed of the NC winding machine, and winding out each phase secondary winding at one time in accordance with the A-B-F-E-C-D or A-B-E-F-C-D phase order; (3) adopting the entire dual-vacuum impregnating process to impregnate the entire rod position detector coil winding; (4), welding the coil winding with the coil lengthening leading wire through resistance melting welding; (5),and carrying out dual-vacuum impregnating on the connecting points between the coil winding and the coil lengthening leading wire after an organosilicon casing is sleeved. The method solves the problems of insulation reduction and coil breaking of the rod position detector in the high-temperature and high-radiation environment and enables the service life of the detector to reach 40 years.

Description

technical field [0001] The invention belongs to the field of pressurized water reactor nuclear power plants, and in particular relates to a method for integrally winding coils of control rod position detectors in pressurized water reactor nuclear power plants. Background technique [0002] As a component of the Control Rod Drive Mechanism (CRDM), the control rod position detector of the PWR nuclear power plant is the source of the rod position detection signal. Such as figure 1 As shown, the PWR control rod is in the high-temperature and high-pressure pressure shell, and its position can only be measured indirectly. The sensor for detecting the rod position (that is, the rod position detector) is installed on the outer wall of the pressure-bearing shell of the rod position travel sleeve , Using the principle of electromagnetic induction to convert the mechanical displacement of the rod into electricity, after processing, send the actual rod position indicator and other alar...

AI Technical Summary

Problems solved by technology

(2) The breakpoint of the plug lead wire and the long lead wire of the coil is connected by tin soldering, and the break point between the long lead wire of the coil and the coil is connected by silver soldering. The high temperature resistance and radiation resistance of the two places are very poor. After several fuel cycles, the solder joints became oxidized, blackened, brittle, and broke with a light touch.

(3) The insulation treatment of the connection point is not complete, and the small burrs at the welding point pierce the casing to reduce the insulation

For this reason, the maintenance personnel rushed to repair for three days in a high-temperature and high-radiation environment, which also delayed the grid-connected power generation of the power station for three days, causing great economic losses to the power station

[0009] The control rod detectors of domestic or exported pressurized water reactor nuclear power plants all adopt the same processing technology. As time goes by, due to thermal aging and radiation effects at the internal connection points of the coils, the internal insulation drops and the coils Disconnection may occur at any time during the operation of the power station. For example, the CHASHMA#1 unit exported to Pakistan and the rod position detectors of related units of Qinshan Nuclear Power Phase II have had similar problems, which seriously threaten the safe and stable operation of the power station.

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