Self-aligning seal system for maintenance service in nuclear rea

Details Self-aligning seal system for maintenance service in nuclear rea Self-aligning seal system for maintenance service in nuclear rea

1995-01-12

1996-12-17

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Seal arrangements

376204, 251319, G21C 1300

Patent

active

055861547

ABSTRACT:
A self-aligning seal system for facilitating the repair or replacement of components of recirculation pump assemblies which penetrate the bottom head of the reactor pressure vessel of a boiling water reactor. The self-aligning seal system enables an operator to block off stub openings in the bottom portion of a water-filled reactor pressure vessel while performing maintenance in an underlying dry field without draining the coolant water from the reactor pressure vessel. To prevent leakage due to misalignment of the seal relative to the open end of the stub, the seal system is provided with a self-alignment guide member which centers the sealing unit relative to a diffuser opening coaxial with the stub as the sealing unit is lowered onto the stub.

REFERENCES:
patent: 1988044 (1935-01-01), Moran
patent: 5070589 (1991-12-01), Howell et al.
patent: 5078954 (1992-01-01), Smith et al.
patent: 5102612 (1992-04-01), McDonald et al.
patent: 5104611 (1992-04-01), Woods et al.

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