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VIRGINIA POWER FINISHES RECORD 96-DAY STEAM GENERATOR REPLACEMENT

 RICHMOND, April 12 /PRNewswire/ -- Virginia Power returned North Anna Unit 1 to service Saturday, capping a record 96-day project to replace the unit's three steam generators, perform maintenance on the service water system and refuel the nuclear reactor.
 The project finished 14 days ahead of the company's goal of 110 days and more than $50 million under budget.
 "Our thanks for a job well done go out to the hundreds of people who were involved in all three phases of this outage," said William L. Stewart, senior vice president-Nuclear. "The planning that went into this project was critical to bringing it to completion safety, ahead of schedule and under budget. This was a textbook example of teamwork leading to a successful, safe ending.
 "The lessons of this project and its accomplishment will go a long way to helping the nuclear industry better understand how such a large undertaking can be done safely and economically. The lessons certainly will be important for those utilities with smaller units that are beginning to plan for new steam generators."
 Virginia Power, relying on data from previous steam generator replacement projects worldwide, projected the steam generator replacement cost would run to about $185 million and that it could take as many as 150 days to complete. The company also expected the cumulative radiation dose to project workers to be 480 rem.
 Preliminary results, however, showed that even those conservative projections were improved through planning and attention to detail:
 -- The total cost of the project is expected to be about $130 million.
 -- The 96-day breaker-to-breaker outage bested the previous world mark of 100 days at Sweden's Ringhals 2 unit and the previous U.S. record of 139 days at New York Power Authority's Indian Point 3.
 -- The cumulative radiation dose to the more than 700 workers was 240 rem.
 -- In a project that took more than 550,000 man-hours to complete, no workers were involved in accidents that required doctors' care.
 Virginia Power replaced the steam generators because the U-shaped tubes inside the generators were showing signs of wear and corrosion. About 20 percent of the 3/4-inch tubes had been plugged during previous outages, lowering the unit's operating efficiency.
 Westinghouse Electric Corp. used an improved nickel alloy tube and a newer internal design in manufacturing the new generators. Westinghouse also supplied the replacement generators for Virginia Power's other nuclear unit, Surry, in 1979-80, and they have performed economically and safely since their installation.
 "We are expecting similar results with Unit 1's new generator," Stewart said. "With this successful completion, nuclear will remain the most-economical fuel source for our customers."
 The other major work of this outage was the inspection and refurbishment of the Unit 1 service water piping system. The system provides cooling water for a variety of station equipment during normal


and emergency operations. Corrosion caused by microbiological organisms had been detected in these pipes.
 Approximately 800 feet of 24-inch diameter pipes that are encased in concrete were cleaned, inspected, welded where necessary and coated with a special epoxy to hinder further corrosion. This in-close work required the building of a full-scale model, special trollies for the workers to use as they navigated the 24-inch pipes and special lighting and ventilation aids.
 Unit 2's pipes will be inspected and repaired during a scheduled refueling outage later this year.
 North Anna Unit 1, a 963-megawatt pressurized water reactor manufactured by Westinghouse, began generating electricity in 1978. It is located about 70 miles northwest of Richmond on the shores of Lake Anna in Louisa County.
 -0- 4/12/93
 /CONTACT: James W. Norvelle of Virginia Power, 804-771-6115/


CO: Virginia Power ST: Virginia IN: UTI SU:

TW-MH -- DC020 -- 4742 04/12/93 11:58 EDT
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Date:Apr 12, 1993
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