Please select any photo in the gallery for a larger version and descriptive caption.
This photo gallery documents the main circulation pumps and the repair/transport corridor in Unit 2 at the Chernobyl Nuclear Power Plant as they appeared in mid-November 2016. Unit 2 operated until a fire damaged the No. 4 generator and the unit’s feedwater machinery in October of 1991, after which the unit was permanently shut down. It is an example of the earliest variant of the RBMK plant design, following the model of the Leningrad units. The main circulation pumps in these earlier units are aligned on an axis perpendicular to the turbines and on the +1.0m elevation, whereas in the later generation of RBMK units (e.g. ChNPP Units 3-4), the pump engines are on the +12.5m elevation and aligned parallel with the turbines so that twinned units could share the same MCP engine halls and associated cranes. The earlier-generation units are smaller than the later generation, mainly because they lack a steam-condensing “accident localization system” beneath the reactor.
Room 114/3, the eastern main circulation pump engine room for Unit 2 at the Chernobyl Nuclear Power Plant, viewed from the +12.4m balcony at the north end of the room. Each pump motor is rated at 5.6 MWe, supplying 4.3 MW of shaft power under typical load to the pump impeller beneath the floor. Three of the four pumps are running in normal operation, and one is in standby. Also visible are the overhead service crane at the far end of the room, and the valve stems for the suction and discharge control valves on each pump. Green pipes on the wall at right carry cooling water for the pump bearings and seals.
Room 114/4, the western main circulation pump engine room in Unit 2 at the Chernobyl Nuclear Power Plant. View is to the south, showing all four MCP motors and the overhead crane for servicing them. The reactor vault is to the left. On the floor to the left of the pumps are the throttle valve controls for the main circulation circuit attached to the discharge side of each pump. In normal operation, three of the four pumps would be running and one would be on standby.
Closeup of the southernmost main circulation pump motors in Room 114/4, Unit 2, Chernobyl Nuclear Power Plant. Bearing cooling water and lubricating fluid lines to the pump can be seen.
A visitor stands next to one of the giant 6-kV main circulation pump motors in Unit 2 at Chernobyl Nuclear Power Plant, Room 114/4. Each pump motor produces about 4.3 MW shaft power under normal operating conditions.
Coolant water sampling station in Room 114/4, Chernobyl Unit 2.
Stairway in the Unit 2 reactor building at Chernobyl, lying directly beneath the steam separator compartment.
View eastward down the railroad tracks that pass beneath Units 1 and 2 at the Chernobyl plant. This repair and transportation corridor is used to move heavy equipment in and out of the plant. Above the corridor are massive panels that can be removed to facilitate the use of cranes to hoist equipment. The red door at left leads into a main circulation pump room. A radiation monitor can also be seen on the wall at left.
A Ukrainian National Guardsman stands next to the open doors of the Units 1-2 repair and transport corridor, used for moving heavy equipment in and out of the reactor buildings. View down from the +10m “gold corridor” in the deaerator building.
Locations shown in the photo gallery may be identified on the following plan of the +1m elevation in the Unit 2 reactor building, taken from plant safety documentation:
+1m elevation in Block “B” (Unit 2 reactor building), Chernobyl Nuclear Power Plant.