Control rod drives for nuclear reactors

Patent · Tue May 30 04:00:00 EDT 1978

OSTI ID:7061852

Nishimura, A

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
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220400* -- Nuclear Reactor Technology-- Control Systems
BWR TYPE REACTORS
CONTROL ROD DRIVES
DESIGN
REACTOR COMPONENTS
REACTOR SHUTDOWN
REACTORS
SCRAM
SHUTDOWNS
WATER COOLED REACTORS
WATER MODERATED REACTORS