France has all sorts of problems and their grid would break regularly if they couldn't import energy during the Summer when their cooling water sources get too hot and they have to shut down all their reactors.
All sources of power can have engineering challenges. Like the recent Texas blackouts where equipment related to the gas supply stopped due to the cold weather.
Common, but not the same. Nuclear power work efficiency (30-40%?) is typically lower than a gas turbine plant (60%?). So electrical watt for electrical watt, the nukes need far more cooling water.