There are 4 ELPSW vertical pump-motor sets per Unit (5/6/7/8-71310-P1/2/3/4) for a total of 16 across Pickering B units. Although the Pickering B ELPSW pumps were intended to provide backup cooling water flow, they are commonly used for continuous service with the unit at power.

There has been elevated vibration levels at the motor locations and this was addressed by a dynamic absorber mass installed at motor non-drive end to eliminate resonance at running speed. However, recently there has been increases in vibration levels at the motor locations that required further troubleshooting to determine the cause.