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US 6,188,741 B1Granted
Machined stub tube in a bottom head of a boiling water reactor
AssigneeGeneral Electric Company
InventorsGary J. Ballas, Jack T. Matsumoto, Alex B. Fife
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AssigneeGeneral Electric Company
InventorsGary J. Ballas, Jack T. Matsumoto, Alex B. Fife
Estimating the term…
An integral stub tube which simplifies the reactor pressure vessel fabrication process, provides a structural transition between the penetration and head, and facilitates future remote inspection of the attachment weld is described. In one embodiment, a stub tube is machined into the bottom head dome. Specifically, a penetration is formed in the bottom head dome by a bore having a stub tube portion. The stub tube portion has a cylindrical shape and a length of the stub tube portion is selected to provide a transition between a penetration housing and an adjacent portion of bottom head dome. The penetration housing extends through the penetration, in the dome. A weld attaches the stub tube portion to the penetration housing.
A bottom head for a boiling water reactor, said bottom head comprising a plurality of penetrations therethrough, at least one of said penetrations comprising a stub tube portion and a bore extending through said stub tube portion, said stub tube portion machined into an inside surface of said bottom head so that said stub tube portion does not extend beyond said bottom head inside surface, said stub tube portion comprising an end configured to be welded to a penetration housing.
A bottom head for a reactor pressure vessel, said bottom head comprising:
Dependencies are inferred from the claim text.