Radiant energy – Radiation controlling means – Shielded receptacles for radioactive sources
Patent
1987-10-19
1990-01-09
Howell, Janice A.
Radiant energy
Radiation controlling means
Shielded receptacles for radioactive sources
2505071, 376272, 220327, 220256, G21F 500
Patent
active
048930229
ABSTRACT:
An improved closure for covering and sealing a radioactive waste cask of the type having an opening circumscribed by a ledge is disclosed herein. The closure generally comprises an inner lid having an outer edge circumscribed by a gasket which is seatable over the ledge which circumscribes the opening, and an outer lid which is securable around the cask opening by either a screw-type or a breech-lock mechanism. In either case, the outer lid may be rotated into locking engagement with the container without imparting rotational forces to the gasket of the inner lid, thereby protecting the gasket from unnecessary rubbing forces. If the breech-lock mechanism is used, inner and outer lids may be rotatably connected to one another by a minimum of three suspension pin assemblies equidistantly spaced around the edges of both. The rotatable connection afforded by these suspension pin assemblies unitizes the closure while advantageously allowing the gasket of the inner lid to remain stationary while the outer lid is secured to the cask opening. To secure the gasket of the inner lid against the ledge of the cask opening, the outer lid is provided with a plurality of jack bolts engaged in threaded bores which extend completely through the outer lid. After the closure is secured over the cask opening, these jack bolts may be screwed through the outer lid into engagement against the inner lid, thereby forcing the inner lid gasket into sealing engagement with the ledge of the cask opening.
REFERENCES:
patent: 195898 (1877-10-01), Lester
patent: 4302680 (1981-11-01), Ahner et al.
patent: 4330711 (1982-05-01), Ahner et al.
patent: 4594214 (1986-06-01), Popp et al.
patent: 4634873 (1987-01-01), Bezer et al.
patent: 4636645 (1987-01-01), Kessinger
patent: 4676712 (1987-06-01), Hayward et al.
patent: 4754894 (1988-07-01), Simon et al.
Hall George V. B.
Mallory Charles W.
DePaul L. A.
Howell Janice A.
Miller John A.
Westinghouse Electric Corp.
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