公开(公告)号：US3905634A

公开(公告)日：1975-09-16

申请号：US47618474

申请日：1974-06-04

Applicant: US ENERGY

Inventor： JOHNSON MELVIN L ,  SHAWVER BRUCE M

IPC: G21C7/14 ,  G21C7/12 ,  G21C19/105 ,  G21C7/08

CPC classification number: G21C7/12 ,  G21C19/105 ,  G21Y2002/101 ,  G21Y2002/205 ,  G21Y2002/206 ,  G21Y2002/30 ,  G21Y2004/30 ,  G21Y2004/301 ,  Y02E30/39 ,  Y10S294/906

Abstract: A simple, reliable, and fast-acting means for releasing a control element and allowing it to be inserted rapidly into the core region of a nuclear reactor for scram purposes. A latch mechanism grips a coupling head on a nuclear control element to connect the control element to the control drive assembly. The latch mechanism is closed by tensioning a cable or rod with an actuator. The control element is released by de-energizing the actuator, providing fail-safe, rapid release of the control element to effect reactor shutdown. A sensing rod provides indication that the control element is properly positioned in the latch. Two embodiments are illustrated, one involving a collettype latch mechanism, the other a pliers-type latch mechanism with the actuator located inside the reactor vessel.