Nuclear Event in USA on September 11 2018 06:24 AM (UTC).
One of Indian Point's two nuclear reactors was shut down Friday night after workers discovered a leak in a backup cooling system, federal safety regulators said Monday. Unit 3 was shut down Friday after a plant operator noticed a small amount of dry boron in the reactor's safety injection system, according to Neil Sheehan, a spokesman for the Nuclear Regulatory Commission. Boron is a white powder formed when boric acid, which is used to control reactivity in a nuclear reactor, dries. Its presence is an indication that there might have been a leak. "Based on the amount of dry boron found, the leak is believed to be small," Sheehan said. "However, because this problem could affect the operability of safety injection pumps, plant operators determined a shutdown to conduct repairs was necessary." Entergy officials contacted the NRC after plant operators discovered what they determined to be a "minor leak," which occurred in a Boron Injection Tank housed inside Unit 3. "The plant was subsequently shut down so workers could investigate the issue and plan for repairs," Entergy spokesman Jerry Nappi said. "Water from the tank, called a Boron Injection Tank, was contained inside the building and there was no challenge to safety nor any release of radiation." The NRC's resident inspectors will monitor repairs before the reactor is returned to service. "The shutdown was performed without any problems," Sheehan said. The leak occurred in a safety injection system, which supplies water to the reactor in case of an actual leak in the reactor's cooling system, Sheehan said.