NRC Starting to Return to Normal Inspection Coverage After Sandy

In addition to opening the headquarters and Region I offices tomorrow, the NRC is also beginning to return to normal inspection coverage for nuclear power plant sites in the Northeastern United States. Heightened coverage will continue at Oyster Creek, a plant in Lacey Township, N.J., still in an “Alert” due to high water levels in its water intake structure.

In addition to the event at Oyster Creek, three reactors experienced trips, or shutdowns, during the storm. They were Indian Point 3, in Buchanan, N.Y.; Salem Unit 1, in Hancocks Bridge, N.J.; and Nine Mile Point 1, in Scriba, N.Y. All safety systems responded as designed.

At Oyster Creek, the Alert – the second lowest of four levels of emergency classification used by the NRC – remains in effect as plant operators wait for the water intake levels to drop to pre-designated thresholds. The water level rose due to a combination of a rising tide, wind direction and storm surge. Oyster Creek was shut down for a refueling and maintenance outage prior to the storm and the reactor remains out of service. Water levels are beginning to subside to more normal levels, but the plant remains in an Alert status until there is enough confidence levels will remain at more normal levels. Offsite power at the plant is in the process of being restored.

Meanwhile, three plants – Millstone 3, in Connecticut, Vermont Yankee, in Vermont, and Limerick, in Pennsylvania, – reduced power in advance of or in response to the storm. Millstone 3’s power was reduced to about 70 percent in advance of the storm to minimize potential impacts on its circulating water system due to the storm. Vermont Yankee reduced power to 89 percent in response to a request from the grid operator due to the loss of a transmission line in New Hampshire. Limerick Unit 1’s power was reduced to about 50 percent and Limerick Unit 2’s to about 25 percent in response to low electrical demands on the grid because of storm-related power outages.

Besides potentially affected nuclear power plants, the NRC also monitored any possible impacts on nuclear materials sites it oversees but did not identify any concerns.

NRC inspectors were at all of the nuclear power plants expected to experience the greatest effects of the storm. Those inspectors were tasked with independently verifying that operators were following relevant procedures to ensure plant safety before, during and after the storm.

We will continue to coordinate with other federal and state agencies prior to the restart of the affected plants.

Eliot Brenner
Public Affairs Director

NRC Keeps Eye on Nuclear Plants in Sandy’s Path – Including Three That Shut Down During the Storm

We continue to maintain our heightened watch over nuclear power plants impacted by Sandy – including three reactors that experienced shutdowns during the storm and Oyster Creek in New Jersey, which remains in an “Alert.”

The three reactors to experience trips, or shutdowns, during the storm are Nine Mile Point 1 in Scriba, N.Y., Indian Point 3 in Buchanan, N.Y.; and Salem Unit 1 in Hancocks Bridge, N.J.

Nine Mile Point 1 underwent an automatic shutdown at about 9 p.m. Monday when an electrical fault occurred on power lines used to send power to the grid. It is likely a storm-related event, but the plant’s operators are still evaluating the cause. All plant safety systems responded as designed and the shutdown was safely carried out. Meanwhile, Nine Mile Point 2 experienced a loss of one of two incoming off-site power lines as a result of the fault. One of the plant’s emergency diesel generators started in response to generate power usually provided by the line. Nine Mile Point 2 remained at full power.

Indian Point 3 automatically shut down at about 10:40 p.m. Monday in response to electrical grid disturbances caused by the storm. All safety systems responded as designed and the unit was placed in a safe shutdown condition.

Salem Unit 1 was manually shut down by plant operators at about 1:10 a.m. Tuesday as a result of circulating-water pumps being affected by high river level and debris in the waterway. The circulating-water system is used to cool down steam generated by the reactor; it is a closed system that does not come into contact with any radioactivity.

At Oyster Creek, the Alert was declared at approximately 8:45 p.m. Monday, preceded by an “Unusual Event” at about 7 p.m. when the water level first reached a minimum high water level criteria. The water level rose due to a combination of a rising tide, wind direction and storm surge. While the water level has dropped since peaking earlier today, the Alert will not be exited until the level is below the specific criteria for the intake structure, which is where water from an intake canal is pumped into the plant for cooling purposes. Oyster Creek was shut down for a refueling and maintenance outage prior to the storm and the reactor remains out of service.

The NRC will continue to coordinate with other federal and state agencies prior to the restart of the affected plants.

Eliot Brenner
Public Affairs Director