Adjustable speed drive system for primary loop recirculation...

Details Adjustable speed drive system for primary loop recirculation... Adjustable speed drive system for primary loop recirculation...

2006-04-10

2008-09-30

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

C307S043000, C376S277000

Reexamination Certificate

active

07429807

ABSTRACT:
An adjustable speed drive system for a primary loop recirculation pump capable of keeping a PLR pump operating even if a single malfunction occurred in a main adjustable speed drive circuit portion. The drive system for the primary loop recirculation pump has a backup main adjustable speed drive circuit portion, and a breaker for switching between an incoming destination and an outputting destination of the backup main adjustable speed drive circuit portion. A control signal of an inverter control portion is switched to control an inverter included in the backup main adjustable speed drive circuit portion, and when a malfunction occurred in the adjustable speed drive main circuit, by switching to the backup main adjustable speed drive circuit portion, the primary loop recirculation pump of a nuclear reactor is continuously controlled and operated.

REFERENCES:
patent: 5610957 (1997-03-01), Tanikawa et al.
patent: 5896434 (1999-04-01), Yoshizumi et al.
patent: 6747882 (2004-06-01), Tanaka et al.
patent: 08-080061 (1996-03-01), None
U.S. Appl. No. 11/032,289, filed Jan. 10, 2005, M. Sugiyama et al.

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