Control rod drives for nuclear reactors
A control rod drive for a nuclear reactor which has an index tube coupling a control rod at one end and connecting a drive piston at the other end is adapted to vertically move the index tube by hydraulic pressure applied thereto. The index tube is formed with at least one helical groove on the outer surface and a plurality of recesses on the bottom surface of the helical groove. Collet fingers each having one end always urged against the index tube and the other end secured to a drive cylinder are provided for controlling the movement of the index tube. The collet fingers are able to engage with and disengage from the helical groove during rapid insertion of the control rod into a reactor core while able to slide in the helical groove during extraction of the control rod out of the core and to engage with the recess to prevent the movement of the control rod.
- Assignee:
- Hitachi, Ltd.
- Patent Number(s):
- US 4092213
- OSTI ID:
- 7061852
- Resource Relation:
- Patent Priority Date: Priority date 4 Apr 1975, Japan
- Country of Publication:
- United States
- Language:
- English
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