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SENECA, S.C. (AP) -- Officials say a South Carolina nuclear plant that recently switched from analog to digital controls had problems while powering up after a scheduled outage.

Sandra McGee of Duke Energy said Monday that operators Friday noticed a problem Friday with an instrument that reads power levels on one of the units at the Oconee Nuclear Station.

McGee says operators swapped out wires in the system that monitors reactor power and temperature and fixed the problem.

Oconee is the first nuclear plant in the country to switch from analog to digital controls. The reactor was powering up after being offline since early April while the digital controls were installed and other maintenance was performed.

McGee says Oconee has been operating at 100 percent power since it was brought back online Friday.

(Copyright 2011 by The Associated Press. All Rights Reserved.)