NRC file photo of North Anna, on the Lake Anna shore.At 1:18 a.m. Eastern on August 25th, Dominion Nuclear communicated a "Notice of Unusual Event" at its North Anna nuclear power plant in Mineral, VA to the U.S. Nuclear Regulatory Commission (NRC) when an aftershock registering less than 5.0 on the Richter scale, according to National Public Radio, impacted the site.