Karl B Larsen

US Patent:

55861547, Dec 17, 1996

Filed:

Jan 12, 1995

Appl. No.:

8/371736

Inventors:

Kirti Kumar - San Jose CA
Karl B. Larsen - San Jose CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 1300

US Classification:

376203

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.

US Patent:

57938270, Aug 11, 1998

Filed:

Sep 22, 1995

Appl. No.:

8/532183

Inventors:

Karl Bomann Larsen - San Jose CA
Charles Arthur Dalke - San Jose CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 900
G21C 1700
G01N 1700

US Classification:

376255

Abstract:

A device for carrying out a surveillance program to monitor the environmental effect of radiation and high-temperature oxygenated water on the shroud material in an operating reactor. The device is a holder containing shroud material specimens and encapsulated neutron flux monitors. The holder is installed on the shroud wall and left in place for a predetermined period of reactor operation time for the purpose of monitoring the neutron fluence effect on the shroud material specimens housed in the holder. The specimen holder is later removed from the reactor. The specimens are removed from the holder and examined in a laboratory to determine any changes in material properties. The specimen holder comprises a bolt-like device having a hollow head and a threaded shaft. The hollow head provides space for material specimens and neutron flux monitors. The specimen holder is attached to the shroud wall by screwing the threaded shaft into a threaded hole in shroud wall.

US Patent:

54266750, Jun 20, 1995

Filed:

Nov 1, 1991

Appl. No.:

7/786460

Inventors:

Kirti Kumar - San Jose CA
Karl B. Larsen - San Jose CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 1300

US Classification:

376203

Abstract:

A self-aligning seal system for use in carrying out maintenance services in a nuclear fission reactor plant is disclosed. The self-aligning seal system enables an operator to block off openings in the lower portion of a water filled reactor pressure vessel for maintenance service in an underlying dry field without draining the coolant water from the reactor pressure vessel.