NESW Flashcards
(27 cards)
What are the NESW pump trips?
- Overload
- Overcurrent
- Load Shed (Seq back on)
- Load Conservation (CTS)
- Manual
What NESW pump autostarts do you get when the switch is in Auto?
- Low Header Pressure 55 psig (60 psig U2) (only when control switch in Auto)
- SI
- Load Shed
How soon after a Load Conservation can a NESW pump be restarted and how is it done?
- It can be restarted after 75 secs by taking the pump switch to trip/lockout and back to on/run
What are the NESW pump suction sources?
Both Units:
- CW Intake Tunnel (Normal)
- Discharge Tunnel (Alt)
What are the NESW pump power supplies?
- 11/21C (N NSEW Pump)
- 11/21B (S NESW Pump)
Which NESW header has the glycol loads on it?
- NESW Miscellaneous Header
When does WMO-906 (NESW Misc header supply valve) auto close?
- On a Load Conservation
Which valves isolate on a load shed in the NESW system and why?
L.O. cooler WRV’s close:
- maximizes flow the PAC, CAC, CLVs (If in Open Loop)
- lowers load on EDG by lowering load on NESW
Which unit’s NESW supplies the Seal Oil Coolers?
- Unit 2
When does the NESW header supply the Containment vent units, blowdown heat exchanger, and RCP Motor air coolers ?
- When Containment Chill water is in Open Loop.
What loads are on the NESW Misc Header?
- Glycol Chillers
- Ice Bin Cooling
- Fluidizer Chiller Cndnsrs
- Fluidizer Air Precoolers
- Chem Cleaning Mix Tank
- MUP
- PHB BD Tank
- Misc Sealing and Cooling
- TRS Neutralization Ring Header
What NESW pump autostarts do you get when the switch is in neutral?
- Load Shed
- SI
What is the most important load on the NESW Misc Header?
- Glycol Chillers
What has to be done in order to reset the Lube Oil Cooler WRVs after a load shed?
- All WRV Controllers have to be taken to minimum before you can push the reset button to get them to reset
When do the LO Cooler WMOs get a close signal and when can they be operated after?
Load Conservation, they can be operated 75 sec after a load con
Which NESW Containment Isolation Valves don’t isolate on a Load Conservation?
- CLV Units
Which NESW Containment Isolation Valves isolate on a Load Conservation?
- CIR Vent Units
- CUV Units
- RCP Motor Air Coolers
Where is the NESW Header Pressure sensed?
- Downstream of the Strainer but before the Discharge check valve
What occurs in the NESW Sys on a Load Conservation?
- Lube Oil Motor Op Valves (WMO’s) Automatically Close
- NESW (inlet) CIV’s Automatically close: for CUV’s IR Vent Units, and MAC’s
- Unit Crosstie Valve to Misc Header automatically closes (ie. Glycol)
- NESW Pp trips W/CTS signal (Can be restarted after 75 sec by going to Trip/Lockout)
What occurs in the NESW System on a Loadshed?
- NESW Pp trips and Seq back on
- L.O. cooler (WRV’s) close:
which maximizes flow the PAC, CAC, CLVs - lowers load on EDG by lowering load on NESW
Which Containment NESW Load(s) DO NOT have Backup Air Bottle(s) for the CA to the NESW Cntmt Isol Vlv(s)?
RCP Motor Air Coolers CIVs
IF you have a CTS, then reset SI, NESW pumps which were NOT running prior to event will?
Restart unless locked out.
What is the power supply for the NESW MOVs
250 VDC
On a phase B what position do containment isolation valves go to
All containment isolation valves close on a phase B
