Human error is being blamed for a radiation spike at the Vermont Yankee nuclear plant that prompted the evacuation of about a dozen workers from the main reactor building for about two hours.
Plant spokesman Robert Williams says a worker did an incomplete job clearing water off of a demineralization filter during routine monthly maintenance. A short time later, control room operators spotted the doubling of radiation levels in a main steam line.
Williams says there were no radioactive releases to the environment, and that the plant’s operations and power level were not affected.
Tuesday’s incident remains under investigation.