UPDATE 1-Calif. San Onofre 3 reactor refuel 60 pct complete

Tue Dec 7, 2010 12:40pm EST

 (Adds background)
 NEW YORK, Dec 7 (Reuters) - Refueling and maintenance work
on the 1,080-megawatt Unit 3 of the San Onofre nuclear power
plant in California is about 60 percent complete, Southern
California Edison (SCE) said on Tuesday.
 Plant workers still had to conduct maintenance on a
4-kilovolt bus system and a reserve transformer, and inspect
the ocean water cooling system, plant spokesman Gil Alexander
said.
 Work on the steam generators is on schedule and heading
into the final weeks of production activities, he said.
Remaining steam generator tasks include the completion of
piping restoration, repairing the containment opening and
replacing and tensioning the containment tendons.
 SCE shut the reactor for three to four months of refueling,
maintenance and to replace the steam generators on Oct. 10.
 The company will not announce the exact date it expects the
unit to return, Alexander said.
 Last year, SCE replaced the Unit 2 steam generators during
its refueling outage, which took almost seven months from late
September to mid-April.
 SCE has said it learned lessons during the Unit 2 project
that should allow workers to finish the Unit 3 project faster.
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PLANT BACKGROUND/TIMELINE
STATE:     California
COUNTY:    San Diego
TOWN:      San Clemente about 60 miles (97 km) north of San
        Diego
OPERATOR:  SCE
OWNER(S):  - Edison International's (EIX.N) SCE (78.21 pct)
        - Sempra Energy's (SRE.N) SDG&E (20 pct)
        - Riverside (1.79 pct)
CAPACITY:  2,150 MW
UNIT(S):   - Unit 2 - 1,070-MW Combustion Engineering
           pressurized water reactor
        - Unit 3 - 1,080-MW Combustion Engineering
           pressurized water reactor
FUEL:      Nuclear
COST:      $4.5 billion
DISPATCH:  Baseload
TIMELINE: 
1968 -     Unit 1 (a Westinghouse pressurized water reactor)
        enters service
1983 -     Unit 2 enters service
1984 -     Unit 3 enters service
1992 -     Unit 1 retired
2010 -     California state water board rules that SCE and
        all power plants using sea water for cooling
        switch to a closed loop system, like cooling
        towers, to reduce fish kills.
2022 -     Units 2 and 3 licenses expire
 (Reporting by Scott DiSavino; Editing by Lisa Shumaker and
Dale Hudson)






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