Apparatus for exchanging control rod drive mechanism in a nuclear reactor
An apparatus is described for exchanging a control rod drive mechanism of a nuclear reactor of the type comprising a horizontal platform supported to be rotatable in a working chamber disposed below a reactor pressure vessel and a traveling carriage traveling on a rail assembly laid on the platform. A beam is attached to the traveling carriage to be swingable between the vertical and horizontal positions and is provided with a carrier for vertically moving the control rod drive mechanism. A holding device is secured to the beam so as to hold the control rod drive mechanism when the beam is moved to the horizontal position. The bolts which are used to connect the control rod drive mechanism to a housing in the pressure vessel are loosened and clamped by a bolt mounting device, which is conveyed in and out of the passage of movement of the carrier. There is further provided a carriage for receiving the control rod drive mechanism when the beam is moved to the horizontal position and for conveying the mechanism into an inspection chamber for inspecting the control rod drive mechanism.
- Assignee:
- Tokyo Shibaura Electric Co Ltd (Japan)
- Patent Number(s):
- US 4288290
- OSTI ID:
- 5853535
- Country of Publication:
- United States
- Language:
- English
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