POWDEX Flashcards
What is the maximum operating Powdex differential pressure (DP)?
25# (normal), 50# (maximum allowable).
What is the maximum allowable flow through Powdex vessels?
3700 gpm.
What happens to Powdex vessel latches after going full open?
They latch OPEN.
What are Powdex vessels used for?
Mechanical filtering and ion exchange.
Where are the Hold Pumps (CO-P-4A-F) located, and what is their function?
Located at 322’ below Powdex Vessel; they auto-start at <900 gpm vessel flow and maintain >47 gpm.
Where are the Backwash Pumps (CO-P-3A/B) located?
TB 305’ outside locker room by bowser.
Where are the Spent Resin Pumps located?
TB 355’ between Compartment A and Phase Separator.
What action is required post-trip to return Powdex vessels to normal?
Place 2 Powdex vessels in HAND.
What should be done if EFW is required during Powdex backwash?
Secure CO-P-3A/B to conserve CST volume.
What are the processing options for Powdex backwash?
IWTS (normal), pumped to TB sump, reclaimed to CSTs (if quality is good), or CC-T-2.
What are the criteria for Powdex vessel regeneration?
Chemistry, volume, DP (10#), conductivity, and time (15 days).
What is the required configuration for Powdex vessels post-trip during return to normal?
2 Powdex vessels must be in HAND.
