DOW JONES NEWSWIRES
PPL Corp. (PPL) said Tuesday that its Susquehanna nuclear power plant in Pennsylvania declared an "unusual event" following an earthquake, but the plant is operating normally with no effects from the quake.
A 5.8-magnitude earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt from central Maine to North Carolina.
Susquehanna Unit 1 was operating at full power, while Unit 2 was shut down for scheduled maintenance, PPL said.
Plant crews examined facilities and equipment to check for any damage, but no effects or injuries have been reported, the company said.
Tuesday's earthquake was below the level of seismic activity for which the Susquehanna plant was designed to withstand, the company said.
Dominion Resources Inc.'s (D) North Anna nuclear power plant automatically shut down following the earthquake. The power plant, in central Virginia, lost off-site power and has been using four diesel generators to maintain cooling operations, the U.S. Nuclear Regulatory Commission said.
Six other power plants declared unusual events, including four plants owned by Exelon Corp. (EXC) and one plant owned by Constellation Energy Group Inc. (CEG). The companies said no damage has been reported and that power plant crews were checking facilities for any earthquake-related damage or other effects.
An unusual event is the lowest of four emergency classifications set by the NRC for nuclear power plants.
-By Cassandra Sweet, Dow Jones Newswires; 415-439-6468; firstname.lastname@example.org