G - Physics – 21 – C
Patent
G - Physics
21
C
359/36
G21C 7/12 (2006.01) G21C 19/10 (2006.01)
Patent
CA 1247758
CONTROL ROD DRIVELINE AND GRAPPLE ABSTRACT OF THE DISCLOSURE A control rod driveline and grapple is dis- closed for placement between a control rod drive and a nuclear reactor control rod containing poison for para- sitic neutron absorption required for reactor shutdown. The control rod is provided with an enlarged cylindrical handle which terminates in an upwardly extending rod to provide a grapple point for the driveline. The grapple mechanism includes a tension rod which receives the upwardly extending handle and is provided with a lower annular flange. A plurality of preferably six grapple segments surround and grip the control rod handle. Each grapple rod segment grips the flange on the tension rod at an interior upper annular indentation, bears against the enlarged cylindrical handle at an interme- diate annulus and captures the upwardly flaring frustum shaped handle at a lower and complementary female seg- ment. The tension rods and grapple segments are sur- rounded by and encased within a cylinder. The cylinder terminates immediately and outward extending annulus at the lower portion of the grapple segments. Excursion of the tension rod relative to the encasing cylinder causes rod release at the handle by permitting the grapple segments to pivot outwardly and about the annulus on the tension rod so as to open the lower defined frus- tum shaped annulus and drop the rod. Relative movement between the tension rod and cylinder can occur either due to electromagnetic release of the tension rod within defined limits of travel or differential thermal expan- sion as between the tension rod and cylinder as where the reactor exceeds design thermal limits.
525207
Company General Electric
Eckersley Raymond A.
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