Patent
1976-04-28
1978-04-04
Behrend, Harvey E.
176 36R, 176 58PB, G21C 710
Patent
active
040826090
ABSTRACT:
In a gas cooled pebble bed reactor the poison part of a control rod which s upper and lower portions and an interior cooling fluid channel is movable into and away from a bed of spherical fuel elements; the improvement includes a control rod security device which facilitates removal of the fractured control rod when the control rod breaks between its end portions. The security device includes an oblong member which is located and extends within the cooling channel and is slack relative to the control rod, a device attached to one end of the oblong member for preventing a fall of the oblong member into the lower portion of the control rod, and a device attached to the other end of the oblong member for preventing portions of the control rod from falling into the bed of fuel elements upon a fracture of the control rod between its end portions. The oblong member is sufficiently strong so as to hold the upper and lower end portions together upon the fracture of the control rod, so that its upper and lower end portions then remain interconnected through the security device.
REFERENCES:
patent: 3089838 (1963-05-01), Paget
patent: 3121045 (1964-02-01), Harris et al.
patent: 3519536 (1970-07-01), Rausch
Behrend Harvey E.
Hochtemperatur-Kernkraftwerk GmbH, Gemeinsames Europaisches Unte
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