Patent Number: 052456390
Section: claims

1. A plug assembly for a flow hole defined by an opening in the wall of a nuclear core barrel comprising: plug means having a front end for plugging said flow hole and sealing against said opening, and a back end opposite said front end;  offset arm means extending rigidly in one direction from the back end of said plug means;  head means on said offset arm means for engaging said core barrel wall at a location spaced along said direction from said plug means; and  mounting means for mounting said head means to said core barrel at said location.  providing a plug member having a plug portion, an offset arm extending from said plug portion, and a head connected to said arm;  positioning the plug portion at the flow hole; and  staking the head to the core barrel at a location above the shield.  core barrel means defing a flow hole;  thermal shield means surrounding said barrel means and spaced from said flow hole, said shield means having a top;  plug means for plugging said flow hole and sealing said barrel means;  offset arm means extending generally vertically from said plug means;  head means connected to said arm means for engaging said core barrel means at a location vertically spaced from said flow hole and at a vertical height above said top; and  mounting means for mounting said head means to said core barrel means. 2. The plug assembly of claim 1 wherein the front end of said plug means comprises a circumferential sealing lip for engaging the outer surface of said core barrel. 3. The plug assembly of claim 1 wherein said head means defines a pair of openings and said mounting means comprises a pair of bolts insertable through said openings. 4. The plug assembly of claim 3 further comprising a locking collar for each of said bolts. 5. The plug assembly of claim 1 wherein said offset arm means has a recessed portion intermediate said plug means and said head means. 6. The plug assembly of claim 1 wherein said plug means, offset arm means and head means are integrally formed in a one piece member having a stainless steel alloy composition. 7. The plug assembly of claim 1, wherein the front end of said plug means comprises a tapered surface for engaging the outer surface of said core barrel. 8. A method for plugging a flow hole of a core barrel having a shield surrounding said barrel and outwardly spaced from said hole comprising: 9. The method of claim 8 and further comprising machining a threaded opening in the core barrel at a location above the shield. 10. The method of claim 9 wherein staking the head arm further comprises securing a fastener in said threaded opening. 11. The method of claim 8 and further comprising machining a pair of threaded openings in said core barrel and driving a pair of bolts into said threaded openings. 12. A nuclear reactor assembly comprising; 13. The assembly of claim 12 wherein said plug means comprises a circumferential sealing lip for engaging the outer surface of said core barrel means. 14. The assembly of claim 12 wherein said head means defines a pair of openings and said mounting means comprises a pair of bolts insertable through said openings and threaded to said core barrel means. 15. The assembly of claim 14 further comprising a locking collar for each of said bolts. 16. The assembly of claim 12 wherein said offset arm means has a recessed portion intermediate said plug means and said head means. 17. The assembly of claim 12 wherein said plug means, offset arm means and head means are integrally formed in a one piece member having a stainless steel alloy composition. 18. The assembly of claim 12 wherein said plug means comprises a tapered surface engaging the outer surface of said core barrel means.