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South Carolina's Summer nuclear unit returns to service

South Carolina Electric & Gas's 1,006-MW Summer nuclear generating unit in Jenkinsville, South Carolina, was operating at 30% of capacity after it returned to service early Friday, a company official said.

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The unit connected to the grid at 2 am EDT (0600 GMT) after being shut since August 28, SCE&G spokesman Patrick Flynn said. It was operating at 30% of capacity early Friday, the US Nuclear Regulatory Commission said in its daily reactor status report.

Summer shut automatically August 28 after a fault in a lightning protection circuit in the main transformer, the company said in a report to the NRC August 29. The fault caused the generator and turbine to go offline, causing an automatic trip of the reactor, SCE&G said.

The unit had been operating at 100% of capacity August 28 before the incident, NRC said.

There was no impact on the health and safety of the public from the incident, which occurred on the non-nuclear side of the plant and was not weather-related, Flynn said.

--William Freebairn, william.freebairn@spglobal.com

--Edited by Keiron Greenhalgh, keiron.greenhalgh@spglobal.com