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Module 9 Rad Release Systems > Z51 CRAC > Flashcards

Z51 CRAC Flashcards

1
Q

How does the F073A/B fail?

PSW Control Valve

A

Open

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2
Q

What must you do if instrument air is lost?

A

Throttle F073 A/B to maintain pressure

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3
Q

What will trip STBY fresh air fans?

A

Smoke in the filter train

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4
Q

If the fan for CRAC A goes away what other systems do you use?

A

Stay Fresh air A

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5
Q

What mode of CRAC is used during accident conditions?

A

Recirc - no outside air

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6
Q

What is the control room envelope penetration area limit for each mode?

A

Modes 1,2,3-20 sq in

Modes 4,5 - 205 sq in

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7
Q

What crac dampers close on control room isolation?

A

F010/F011 inlet dampers

F003/F004 exhaust dampers

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8
Q

What is used to maintain positive pressure in the control building?

A

Utility exhaust fan

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9
Q

Will smoke in the intake trip the AC unit during normal operations?

A

Yes

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10
Q

Will smoke in the intake trip the AC unit during emergency operation?

A

No

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11
Q

What are the power supplies for all CRAC components?

A 
A= 15AA
B= 16AB
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12
Q

What is cooled by CRAC A/B?

A

Control Room 166’ elevation
Mezzanine 177’ elevation
Upper Control Room 189’

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13
Q

What type of pressure is the control room maintained and why?

A

Positive to Keep out the zoomies

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14
Q

Where does the standby Fresh Air Unit get suction from?

A

Recirc air from AC or outside air if safe

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15
Q

In a control room isolation event, How Much of the control room air is filtered by standby fresh air?

A

25%

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16
Q

What are the control room isolation signals?

A
  • 41.6”
    1. 23 psig
    4. 5 mRem on the outside air intake duct(HiHi rads)
17
Q

What auto starts on control room isolation?

A

Standby fresh air

18
Q

When will the standby CRAC Unit start?

A

<16,500 scfm low flow on running unit if no trip signals are present

19
Q

What are the trip signals for CRAC A/B?

A

High compressor discharge pressure >280 psig
Low compressor suction pressure <20psig
Low compressor oil pressure <30 psid
Condenser cooling water inlet valve fully closed (bypassed on the start for 5 minutes)

20
Q

What Temp is the control room maintained?

21
Q

Is Control Room purge manual or auto?

A

Always manual

22
Q

What happens to control room purge on a control room isolation signal?

A

Trips because dampers close

23
Q

Can control room purge be used during accidents?

24
Q

What does control room purge do?

A

Exhaust smoke, Freon, fumes, and other vapors from the control room

25
Q

Normal and backup cooling for CRAC A/B

A

PSW- normal

SSW - backup

26
Q

When will the standby standby fresh Air Unit auto start?

A

< 2000 Scfm outlet of running standby fresh air unt

Module 9 Rad Release Systems (10 decks)

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