| 摘要 |
PROBLEM TO BE SOLVED: To provide a control rod position detection apparatus enabling simplification of the structure and improving the detection accuracy of a control rod. SOLUTION: CRD (control rod drive mechanism) arranges a guide tube in an outer tube and a hollow piston in the guide tube. The hollow piston is mounted on a ball nut engaged with a ball spindle, and the control rod is connected with the upper end of the hollow piston. The ball spindle is rotated by an electric motor. A control rod position detection apparatus 20 includes: an input shaft 22 rotated by the electric motor; a gear mechanism 23 installed in a casing 21; and position detectors 28, 29. The gear mechanism 23 includes: gears 24A-24E and rotary shafts 25A-25E to which the gears 24A-24E are attached. The position detectors 28, 29 are installed on the rotary shaft 25E. The rotation of the input shaft 22 is transmitted to the rotary shaft 25E through the gears 24A-24E, and the position detectors 28, 29 detect the position of the control rod. COPYRIGHT: (C)2009,JPO&INPIT
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