There may be increased activity around the Portsmouth Naval Shipyard Wednesday morning, but it's not anything to worry about.

The shipyard said that regularly scheduled training is planned to start at the shipyard at 9 a.m. and may cause noise, and security personnel including U.S. Navy harbor patrol boats will be around the shipyard.

The timing of the exercise coincides with normal closure hours of Gate 2 to minimize disruptions. Gate 1 will remain open as the main access/egress to Portsmouth Naval Shipyard.

The purpose of the exercise is to enhance the training and readiness of the Shipyard’s Naval security team. It is not in response to any specific threat.

The exercise comes two weeks after a false announcement ordering the evacuation of beaches was aired on 9 of 121 Seabrook Station sirens within the 10 mile zone around the nuclear plant.

NextEra Energy Seabrook Station told Gov. Chris Sununu in a letter that it is "conducting a thorough investigation and we will take actions to ensure this situation does not happen again." The company has not yet provided an explanation.

Contact reporter Dan Alexander at or via Twitter @DanAlexanderNH

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