NESW

Question 1

What are the NESW pump trips?

Answer 1

• Overload
• Overcurrent
• Load Shed (Seq back on)
• Load Conservation (CTS)
• Manual

Question 2

What NESW pump autostarts do you get when the switch is in Auto?

Answer 2

• Low Header Pressure 55 psig (60 psig U2) (only when control switch in Auto)
• SI
• Load Shed

Question 3

How soon after a Load Conservation can a NESW pump be restarted and how is it done?

Answer 3

• It can be restarted after 75 secs by taking the pump switch to trip/lockout and back to on/run

Question 4

What are the NESW pump suction sources?

Answer 4

Both Units:

• CW Intake Tunnel (Normal)
• Discharge Tunnel (Alt)

Question 5

What are the NESW pump power supplies?

Answer 5

• 11/21C (N NSEW Pump)

- 11/21B (S NESW Pump)

Question 6

Which NESW header has the glycol loads on it?

Answer 6

• NESW Miscellaneous Header

Question 7

When does WMO-906 (NESW Misc header supply valve) auto close?

Answer 7

• On a Load Conservation

Question 8

When do the NESW strainers auto backwash

Answer 8

• Every 12 hrs

- High dP 2.94 psid

Question 9

When do Strainer backwash alarms come in?

Answer 9

Hi Hi dP 3.5 psid

Question 10

What does T.S. 3.6.3 B (Cnt Isolation Valves) state?

Answer 10

If 2 CIV’s are inop
WITHIN 1 hr:
- Isolate penetration

Question 11

Which valves isolate on a load shed in the NESW system and why?

Answer 11

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

Question 12

Which unit’s NESW supplies the Seal Oil Coolers?

Answer 12

• Unit 2

Question 13

Which unit’s NESW supplies the TSC Air conditioning?

Answer 13

• Unit 1

Question 14

When does the NESW header supply the Containment vent units, blowdown heat exchanger, and RCP Motor air coolers ?

Answer 14

• When Containment Chill water is in Open Loop.

Question 15

What loads are on the NESW Misc Header?

Answer 15

• 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

Question 16

What is cooled by the NESW Norm Header?

Answer 16

• 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

Question 17

What NESW pump autostarts do you get when the switch is in neutral?

Answer 17

• Load Shed

- SI

Question 18

What is the most important load on the NESW Misc Header?

Answer 18

• Glycol Chillers

Question 19

What has to be done in order to reset the Lube Oil Cooler WRVs after a load shed?

Answer 19

• All WRV Controllers have to be taken to minimum before you can push the reset button to get them to reset

Question 20

When do the LO Cooler WMOs get a close signal and when can they be operated after?

Answer 20

Load Conservation, they can be operated 75 sec after a load con

Question 21

Which NESW Containment Isolation Valves don’t isolate on a Load Conservation?

Answer 21

• CLV Units

Question 22

Which NESW Containment Isolation Valves isolate on a Load Conservation?

Answer 22

• CIR Vent Units
• CUV Units
• RCP Motor Air Coolers

Question 23

Where is the NESW Header Pressure sensed?

Answer 23

• Downstream of the Strainer but before the Discharge check valve

Question 24

What occurs in the NESW Sys on a Load Conservation?

Answer 24

• 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)

Question 25

What occurs in the NESW System on a Loadshed?

Answer 25

- 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

Question 26

Which Containment NESW Load(s) DO NOT have Backup Air Bottle(s) for the CA to the NESW Cntmt Isol Vlv(s)?

Answer 26

RCP Motor Air Coolers CIVs

Question 27

IF you have a CTS, then reset SI, NESW pumps which were NOT running prior to event will?

Answer 27

Restart unless locked out.

Question 28

What is the power supply for the NESW MOVs

Answer 28

250 VDC

Question 29

On a phase B what position do containment isolation valves go to

Answer 29

All containment isolation valves close on a phase B

Question 30

On a loss of control air how do the NESW to LO cooler valves fail

Answer 30

Fail close

Question 31

How is the NESW system started to prevent air binding of the pumps

Answer 31

If all CW is off align suction to discharge tunnel then once CW is restored re-align to the inlet tunnel

Question 32

What interface does NESW have with radiation monitoring

Answer 32

Provides sample cooling to: - SJAE Rad monitor (SRA 1900/2900) - Gland Steam Rad Monitor (SRA 1800/2800)