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4806 > NESW > Flashcards

NESW Flashcards

1
Q

What are the NESW pump trips?

A
  • Overload
  • Overcurrent
  • Load Shed (Seq back on)
  • Load Conservation (CTS)
  • Manual
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2
Q

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

A
  • Low Header Pressure 55 psig (60 psig U2) (only when control switch in Auto)
  • SI
  • Load Shed
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3
Q

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

A
  • It can be restarted after 75 secs by taking the pump switch to trip/lockout and back to on/run
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4
Q

What are the NESW pump suction sources?

A

Both Units:

  • CW Intake Tunnel (Normal)
  • Discharge Tunnel (Alt)
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5
Q

What are the NESW pump power supplies?

A
  • 11/21C (N NSEW Pump)

- 11/21B (S NESW Pump)

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6
Q

Which NESW header has the glycol loads on it?

A
  • NESW Miscellaneous Header
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7
Q

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

A
  • On a Load Conservation
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8
Q

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

A

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
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9
Q

Which unit’s NESW supplies the Seal Oil Coolers?

A
  • Unit 2
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10
Q

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

A
  • When Containment Chill water is in Open Loop.
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11
Q

What loads are on the NESW Misc Header?

A
  • 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
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12
Q

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

A
  • Load Shed

- SI

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13
Q

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

A
  • Glycol Chillers
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14
Q

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

A
  • All WRV Controllers have to be taken to minimum before you can push the reset button to get them to reset
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15
Q

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

A

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

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16
Q

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

A
  • CLV Units
17
Q

Which NESW Containment Isolation Valves isolate on a Load Conservation?

A
  • CIR Vent Units
  • CUV Units
  • RCP Motor Air Coolers
18
Q

Where is the NESW Header Pressure sensed?

A
  • Downstream of the Strainer but before the Discharge check valve
19
Q

What occurs in the NESW Sys on a Load Conservation?

A
  • 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)
20
Q

What occurs in the NESW System on a Loadshed?

A
  • 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
21
Q

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

A

RCP Motor Air Coolers CIVs

22
Q

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

A

Restart unless locked out.

23
Q

What is the power supply for the NESW MOVs

A

250 VDC

24
Q

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

A

All containment isolation valves close on a phase B

25
Q

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

A

Fail close

26
Q

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

A

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

27
Q

What interface does NESW have with radiation monitoring

A

Provides sample cooling to:

  • SJAE Rad monitor (SRA 1900/2900)
  • Gland Steam Rad Monitor (SRA 1800/2800)

4806 (10 decks)

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