Nuclear power plant control rod position measurement method
A measurement method and control rod technology, which are applied in nuclear power generation, nuclear engineering, nuclear reactor monitoring, etc., can solve the problems of complex control and monitoring circuits, large number of cable cores, and large interference of measurement coils, so as to improve reliability and availability, Achieve technological maturity and reduce the number of cables
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[0017] The following describes the present invention in detail with reference to the drawings and embodiments:
[0018] A method for measuring the position of control rods in nuclear power plants, which includes the following steps:
[0019] (1) The measuring coil of the rod position detector is used for measurement. The measuring coils are divided into two independent coil groups—group A and group B. Group A is composed of odd groups of coils, and group B is composed of even groups of coils. Multiple coils of the group measuring coil are connected in parallel.
[0020] (2) Apply AC constant voltage excitation to the coils of group A and group B respectively, and use the external excitation power supply to generate alternating magnetic field and current. When the control rod screw is at different positions in the detector, the impedance of the rod detector coil changes , So that the excitation current I of the two sets of coils xA , I xB Changes, by measuring the I xA , I xB Two cur...
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