NESW Flashcards
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
When do the NESW strainers auto backwash
- Every 12 hrs
- High dP 2.94 psid
When do Strainer backwash alarms come in?
Hi Hi dP 3.5 psid
What does T.S. 3.6.3 B (Cnt Isolation Valves) state?
If 2 CIV’s are inop
WITHIN 1 hr:
- Isolate penetration
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
Which unit’s NESW supplies the TSC Air conditioning?
- Unit 1
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 is cooled by the NESW Norm Header?
- TSC Air Conditioning (U1)
- Seal Oil Coolers (U2)
- EHC Skid
- MTLO Tank Coolers
- MFP LO Coolers
- PAC
- CAC
- Conductivity Room Sample
- CHW Plate HX
- CHW Solid Separators
- AFW PP Bearing Cooling
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)
