Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1992-12-30
1995-06-06
Scherbel, David A.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
376203, F16L 5510, G21C 1300
Patent
active
054213690
ABSTRACT:
A mechanically actuated plug comprises a pole system to lower a pair of seals into a refueling pool in a Boiling Water Reactor ("BWR") plant. A plug adapter is connected to the end of a pole system and is attached to a scissors jack assembly. The scissors jack assembly is comprised of at least one jack screw shaft, at least a pair of nuts, scissor arms connected between the nuts and the seals, and scissor arms connected between the nuts and a loading pad. The pole and plug adapter have a central shaft assembly which is connected to the jack screw shaft and transfers rotational motion from the top of the pole to the jack screw shaft. By rotating the central shaft assembly, the plug may be opened to seal the recirculation line. Once opened, the pole and plug adapter are preferably detached from the plug so that the plug may remain in position while the pole system is removed from the refueling pool. The plug has lifting brackets which aid in the removal of the plug from within the refueling pool and which also prevent the plug from rotating when in the closed position. Preferably, the plug is comprised of a pair of scissors jack assemblies for stabilizing the operations of the plug and for evenly distributing the forces applied both to the seals and to the loading pad.
REFERENCES:
patent: 2670799 (1954-03-01), Dobbs
patent: 2810401 (1957-10-01), Stansbury
patent: 3550636 (1970-12-01), Hearne
patent: 3800833 (1974-04-01), Young
patent: 4064912 (1977-12-01), Petrone
patent: 4285368 (1981-08-01), Terrill
patent: 4548783 (1985-10-01), Dalke
patent: 4682631 (1987-07-01), Wilger
Tursi James G.
Wivagg Adrian P.
Combustion Engineering Inc.
Kananen Ronald P.
Mulholland John H.
Scherbel David A.
Till Terrance R.
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