Temporary plug cover for hole or port in steam generator of nuclear power plant
AssigneeEdward J. Hyp
InventorEdward J. Hyp
Life of this patent
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Abstract
A temporary cover is plugged into an open handhole or inspection port in a steam generator or another pressure vessel of a nuclear power plant after bolted covers are removed for maintenance inside the generator or vessel. The temporary cover may be locked to prevent foreign objects from entering the generator or vessel. The cover is vented at inclined angles so that air or gas may pass therethrough but is shielded so that gamma rays, which are the most penetrating type of radiation, are greatly reduced and dispersed away from personnel.
Claims18
A temporary cover for plugging a selected one of a handhole and an inspection port in a steam generator of a nuclear power plant, said cover comprising:
- a cylindrical sleeve having an outer circumferential edge;
- a lead plate shield positioned inside the sleeve, said shield having a plurality of vent holes therethrough;
- and
- an elongated bar secured to the outer circumferential edge of the sleeve and configured to retain the sleeve with the shield in the selected one of the handhole and the inspection port.
Dependencies are inferred from the claim text.