have created a significant safety hazard during at-power operation. The cost of pump repairs, and the production downtime caused by the incident and its cleanup, was significant. The incident also left wood and metal debris unrecoverable in the cooling system. Maintenance incidents at Lepreau in 1995 cost the facility more than $50 million in repairs and replacement power. In 2011, a spill of heavy water in the reactor building triggered a radiation alert and evacuation. NB Power stated that the event did not pose significant impact to the public or environment. This was the first time the reactor building had ever been evacuated. See also List of Canadian nuclear generating stations CANDU reactor Nuclear power in Canada NB Power References Notes Footnotes Further reading NB Power Nuclear power stations in New Brunswick Buildings and structures in Saint John County, New Brunswick Nuclear power stations using CANDU reactors