Emergency retraction means for the manipulator arm of a nuclear

Details Emergency retraction means for the manipulator arm of a nuclear Emergency retraction means for the manipulator arm of a nuclear

1977-03-25

1979-04-17

Engle, Samuel W.

176 38, G21C 1700

Patent

active

041499344

ABSTRACT:
An emergency retraction means is provided for removing the extended manipulator arm of a nuclear reactor vessel inspection device from within a nozzle thereof or from a fully extended position should power for normal extension drive fail. A cable is looped about the interior of a carriage assembly which drivingly engages the remainder of the manipulator arm. The cable is fixedly clamped at one location within the carriage assembly and looped about a first idler pulley mounted in the manipulator arm and is guided therefrom by another idler to an accessible point where the end of the cable is formed into a ring. The ring is detachably secured thereat to the carriage assembly.
When an emergency occurs, a hook is lowered to engage the ring and is then lifted to detach it from the carriage assembly and move it upwardly therefrom. As the ring is pulled up, it tightens the cable about the first idler pulley pulling it towards the main column of the inspection device and mechanically forcing the manipulator arm extension drive to manually retract the manipulator arm.

REFERENCES:
patent: 2675211 (1954-04-01), Regoord
patent: 2774488 (1956-12-01), Goertz et al.
patent: 3164267 (1965-01-01), Jelatis et al.
patent: 3584504 (1971-06-01), Proctor et al.
patent: 3672471 (1972-06-01), Badding
patent: 3809607 (1974-05-01), Murray et al.
"Materials Evaluation," Jul. 1970, vol. 28 (No. 7) pp. 162-166.

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