South Carolina nuclear plant’s cracked pipes get downgraded warning from nuclear officials

Federal regulators have lessened the severity of their warning about cracks discovered in a backup emergency fuel line at a South Carolina nuclear plant northwest of the state capital. The U.S. Nuclear Regulatory Commission downgraded its preliminary “yellow” warning for V.C. Summer Nuclear Station issued this October to a final “white" one after owner and operator Dominion Energy showed its generator could still run for six hours in an emergency, the agency announced Thursday.