Neil Sheehan
Public Affairs Officer
Region I
UPDATE: As an update to the downpower and then shutdown of Calvert Cliffs Unit 1, the plant has restarted and once again began sending power to the electrical grid as of about 1:30 a.m. today (Jan. 26). The plant was returned to service after the main transformer cable that had become disconnected, apparently as a result of blizzard-driven winds, was fixed. That issue led to the plant reduction in power during the storm. Repairs were also made to address condenser tube leakage that was identified and led to a decision to shut down the plant on Monday morning. NRC Resident Inspectors assigned to the plant tracked the repair work and the unit’s restart.
As of Sunday afternoon, only one nuclear power plant in Region I may have been directly impacted by the blizzard. (Region I covers the Northeastern U.S.)
Power output at Calvert Cliffs Unit 1, in southern Maryland, was reduced to just under 15 percent on Saturday evening after an electrical cable associated with a main transformer was found to be disconnected. It was not immediately clear if the storm was responsible for the cable coming loose. The downpower was needed to facilitate repairs.
While upstate New York was expected to be spared much of the intensity of the winter storm, the James A. FitzPatrick nuclear power plant was shut down by its operators at about 10:40 p.m. Saturday after icing impacted the facility’s flow of cooling water drawn from Lake Ontario. Power had already been reduced to about 50 percent at the Scriba, N.Y., plant due to lowering water intake levels at the time of the manual scram (shutdown).
The plant was safely shut down and the NRC’s Senior Resident Inspector for FitzPatrick traveled to the site to independently verify plant conditions and observe operator actions. The single-unit boiling-water reactor remained out of service as of this morning as troubleshooting and follow-up activities continued.
After the Pilgrim nuclear power plant experienced several winter storm-related shutdowns in recent years, the plant’s owner, Entergy, was prepared to conduct a pre-emptive shutdown of the facility should certain severe weather conditions occur. The NRC has been closely monitoring any effects of the blizzard on the Plymouth, Mass., site and has confirmed that there have been no significant impacts at the facility and certainly none that would have triggered the pre-emptive shutdown criteria.
On a similar note, the NRC has kept close tabs on the Oyster Creek nuclear power plant, in Lacey Township, N.J. During Hurricane Sandy in late October 2012, water levels on the canal from which the plant draws cooling water reached levels that caused the declaration of an “Unusual Event” – the lowest level of emergency classification used by the NRC – and later an “Alert” – the next rung up on the emergency classification ladder. The water levels did not reach those levels during this storm and therefore no emergency declarations were necessary.
U.S. NRC Blog 