1. The reactor coolant pump provides sufficient forced circulation flow to ensure adequate heat transfer.
2. The reactor coolant pump is vertical, single stage, centrifugal pump to pump large volumes of reactor coolant at high temperature and pressure.
3. The pump consists of three sections from bottom to top: the hydraulic section, the shaft seal section and the motor section.
4. The hydraulic section consists of the inlet and outlet nozzles, casing, flange, impeller, diffuser, pump shaft, pump bearing, thermal barrier and thermal barrier heat exchanger.
5. The shaft seal section consists of the number one, controlled leakage seal and the number two and three rubbing face seals. These seals are located within the main flange and seal housing.
6. The motor section consists of a vertical, squirrel cage; induction motor with an oil lubricated double Kingsbury thrust bearing, two oil lubricated radial bearings, a flywheel and help establish natural circulation.
7. A flywheel extends flow coastdown after a loss of power to maintain flow through the core and appropriate support equipment.
8. An anti-reverse rotation device prevents the pump from turning backwards which would increase core bypass flow and pump starting current.
9. Shaft sealing is accomplished by a film riding controlled leakage seal with a backup rubbing face seal.
10. The operation of the seal package assures near zero leakage from reactor coolant system at the reactor coolant pump shaft.
11. Seal water injection through the thermal barrier heat exchanger cools and lubricates the seal and pump bearing.
12．Cooling for the motor bearing and barrier heat exchanger is from the component cooling water system.