Pressure vessel penetration sealing device
AssigneeCombustion Engineering, Inc.
InventorsJan H. Sodergren, Harry K. Williams
Life of this patent
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Abstract
A device for sealing a penetration in a pressurizer of a nuclear steam supply system includes a hollow cylinder adapted to be inserted into the heater sleeve, in place of the heater. The cylinder includes a nose portion formed with a number of axially extending slots defining therein a number of radially displaceable segments, each of which has an outwardly extending flange, proximate its distal end, which is engageable with the heater sleeve to resist blowout. A rod, inserted into the cylinder, seals the passage therethrough while locking the displaceable nose portion segments in their sleeve-engaging position. An annular soft nickel band on the outside of the cylinder engages the inner surface of the heater sleeve to provide an effective seal therebetween.
Claims4
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.
Dependencies are inferred from the claim text.