21.   The reactor was shut down following a drop in the cold water supply to the cooling system.

22.   The reactor was shut down last February for repairs, refueling and inspection of its metal casing.

23.   The reactor was shut down Saturday because of hydrogen leaks, the state nuclear energy company Energoatom said.

24.   The same reactor had been shut down Sunday for scheduled maintenance.

25.   The plants number one reactor was shut down last month after employees noticed cracks in the cooling system and an increase in radioactivity levels.

26.   The second reactor will be shut down some in June after work on the first has been finished.

27.   The reactor was shut down Sunday evening after a technician checking a hydraulic system accidentally set off the alarm system.