
Originally Posted by
Romo
LIMERICK — “Several thousand gallons” of water containing as much as five-times the government’s “safe” level of radioactive tritium was accidentally released at Exelon Nuclear’s Limerick Generating Station last month and then flushed into the Schuylkill River, The Mercury learned Thursday.
However the concentrations of contamination in the water were considered so low that they presented “no immediate health and safety concerns,” according to the Nuclear Regulatory Agency, which is why the incident was not reported publicly until 23 days after it happened.
It was 3 a.m. Monday, March 19 when “a manhole cover overflowed during a scheduled and permitted radiological release,” according to an incident report posted on the NRC web site.
“As a result, several thousand gallons of water overflowed briefly, formed puddles in the area, and was discharged” through a permitted discharge to Possum Hollow Creek, which flows from the plant grounds into the Schuylkill River,” according to information from the NRC.
The notification issued to the NRC by Exelon stated “several (water) samples showed increased levels of tritium that were well below permitted Commonwealth and Federal effluent limits.”
NRC spokesman Neil Sheehan wrote in an e-mail that the “maximum level of radioactivity detected in Possum Hollow Creek . . . on the day of the event was 495 picocuries per liter of tritium.”
He noted that the Environmental Protection Agency’s “safe drinking limit for tritium per liter is 20,000 picocuries per liter.”
However, Sheehan also noted that one water sample collected from a puddle near the manhole from which the water first emerged, had a tritium concentration of 113,000 picocuries per liter, more than five times the safe drinking water level.
“Of course the water leaked out onto the ground on the plant grounds would not be used for” drinking, Sheehan said.
However all that water, which Exelon estimated something less than 15,000 gallons, was legally dumped into the Schuylkill River, which is a drinking water source for several downstream communities, including Phoenixville and Philadelphia.