Patent Number: 052971872
Section: claims

1. A device for sealing a penetration in a pressurizer of a nuclear steam supply system, said penetration including a tubular heater sleeve projecting from the pressurizer and providing passage thereinto, said device comprising a hollow cylinder disposable within said heater sleeve and a substantially cylindrical smooth rod disposable within said cylinder, said cylinder having an external diameter substantially equal to the internal diameter of said heater sleeve and a length exceeding the length thereof, said cylinder including a nose portion formed with a plurality of axially extending slots defining therein a plurality of radially displaceable segments, each of said segments having an outwardly extending flange proximate its distal end engageable with said heater sleeve, said rod having a diameter substantially equal to the internal diameter of said cylinder and being operable to prevent radial displacement of said segments and to urge said cylinder against said heater sleeve to provide an interference seal therebetween. 2. The device of claim 1, wherein said cylinder is formed of a nickel alloy and includes an annular band of soft nickel on its external surface, said band being engageable with the inner surface of said heater sleeve to provide said interference seal between said heater sleeve and said cylinder. 3. The device of claim 1, wherein said cylinder is welded to said heater sleeve and said rod is welded to said cylinder. 4. The device of claim 1, wherein said cylinder nose portion is tapered so as to facilitate insertion of said cylinder into said heater sleeve.