The issue occurred on the non-nuclear side of the plant and all safety systems functioned as expected, according to the company.

NB Power site vice president and chief nuclear officer Sean Granville said the issue had no impact on the staff, public and the environment.

"Initial investigations indicate repairs should be straightforward and we intend to make them quickly so that we have the unit ready to connect to the grid and generating electricity again over the next few days," Granville added.

"We intend to continue building on the Point Lepreau Generating Station’s solid performance during the past five months."

Repairs are underway and the station is expected to reconnect to the electrical grid and gradually power back up to 100% later this week.

The company is expected to turn to the Northeastern energy market and Coleson Cove Generating Station to supply any additional power required by the New Brunswick grid until the station returns to full service.

Commissioned in November 2012, the 660MW Point Lepreau Generation Station is a base load contributor to the New Brunswick electrical grid, producing enough electricity to power over 333,000 homes annually for the next 25 to 30 years.