Control rod position sensor is one of the six core components of the control rod hydraulic drive system,which provides the only true rod position indication for nuclear reactors.The grounding measurement capacitance rod position sensor has the advantages of high precision and strong anti-interference ability.Control rod positions can be measured step-by-step by this kind of sensors.In order to clarify the capacitive sensitive mechanism of this kind of capacitance rod position sensors,the sensitivity analysis model of the sensor is established by conformal mapping.Model modification and model validation are conducted by the numerical simulation and results of the static calibration experiments.The results show that the static measurement characteristics of the grounding measurement capacitance rod position sensor can be accurately analyzed by the sensitivity analysis model.The relative error between the results obtained by the sensitive analysis model and experiments is 3.4%.The sensitivity analysis model can be used for structural analysis and optimal design of the sensor.
Grounding measurementRod position sensorSensitivity analysis modelConformal mapping
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