NESW Flashcards
What are the NESW pump trips?
- Overload/Overcurrent
- Load Shed (Seq back on)
- Load Conservation (CTS)
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
Do the NESW pump discharge valves auto open on a manual start signal?
No, they have no auto features.
Must be manually opened after pump start.
If the NESW pump switch is in auto, how must the discharge valve be arranged?
It must be open.
It will NOT auto open when the pump starts.
How soon after a Load Conservation can a NESW pump be restarted and how is it done?
After 75 secs by taking the pump switch to trip/lockout and back to 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?
Miscellaneous Header
When does WMO-906 (NESW Misc header supply valve) auto close?
- On a Load Conservation
What does T.S. 3.6.3 B (Cnt Isolation Valves) state If 2 CIV’s are INOPERABLE?
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 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 blowdown sample heat exchanger?
When Containment Chill water is in Open Loop
What loads are on the NESW Misc Header?
- Glycol Chillers
- Ice Condenser Stuff
- Chem Cleaning Mix Tank
- MUP
- Plant Heating Boiler Blow Down Tank
- Misc Sealing and Cooling System
- 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
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?
WRV Controllers have to be taken to minimum before you can push the reset button
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
Which Containment Isolation Valves do NOT isolate on a Load Conservation?
Containment Lower Vent (CLV) Units
Which Containment Isolation Valves isolate on a Load Conservation?
- Containment Instrument Room (CIR) Vent Units
- Containment Upper Vent (CUV) Units
- RCP Motor Air Coolers (MACs)
Where is the NESW Header Pressure sensed?
Downstream of the Strainer but before the Discharge check valve
What occurs in the NESW System on a Load Conservation?
Isolates the following loads:
- Lube Oil MOVs
- CUV’s
- IR Vent Units
- MAC’s
Additionally,
-** 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 Valve(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
