| 摘要 |
PURPOSE:To improve the efficiency of centering work by providing a laser oscillator together with a beam splitter and an optical position detector on a core support hole, and adjusting an optical vertical reference line so that it passes the center of the core suport hole even through the upper surface of the core support is inclined. CONSTITUTION:The laser light is emitted in the downward vertical direction from the laser oscillator 5A of a light source device A. The light passes through a beam splitter cube 5D, a hole 10 of a frame 5C, and the core support hole 1a. The shift of the central axis of the housing with respect to the vertical laser light reference line is detected by upper and lower light receiving devices of the housing for driving the reactor control rod. The centering is performed so that the amount of shift becomes zero. When the upper surface of the core support 1 is inclined (Figure c) the positioning is performed by a minutely moving table 5B so that the amount of the shift between the center of a detector 5E and the incident position of the laser light reflected by the beam splitter cube 5D becomes zero. A virtural image 12 of the light detector 5E coincides with the center of the core support hole 1a. Thus the efficiency of the centering work is improved. |
