A CANDU 6 reactor typically has 380 fuel channels. Each channel has 12 fuel bundles which means at any given time, a reactor has approximately 4,560 fuel bundles.
This system produces ~2,000 MW of thermal power (heat), which is turned into ~700 MW of electricity .
Each week, approximately 60 new fuel bundles are put into the reactor. The fuel in the reactor is completely replaced roughly every 18 months.