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Module 7 - CTMT Integrity > FHA > Flashcards

FHA Flashcards

1
Q

What valve modulates to maintain Aux building at a negative pressure?

A

F021

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2
Q

Is the F021 on the inlet or the outlet?

A

inlet

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3
Q

How does the F021 respond to DP change in the Aux building?

A

DP goes down - less negative: valve closes

DP goes up - more negative: valve opens

F021 is on the inlet

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4
Q

what must be running to start supply fans?

A

exhaust fans

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5
Q

when will STBY fan auto start?

A

Loss of operating fan sensed by fan low DP

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6
Q

What happens if exhaust fan trips?

A

supply fans trip

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7
Q

what are the FHA fan coil units and what are the trips?

A

C002: trips on F003/F004 < full open, smoke detector, manual reset

C005: trips on F003/F004 < full open, inlet duct high temp, auto reset

C007: no trips

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8
Q

What is the supply fans’ suction source?

A

outside air

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9
Q

what happens when SBGT initiates?

A

All fans stop and dampers close

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10
Q

what happens if running exhaust fan trips and STBY fan fails to start?

A

Supply fan will trip

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11
Q

Which pool has the reheater coil?

A

spent fuel pool

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12
Q

what’s the purpose of the reheater coil?

A

Aid in mixing and absorption of fission product gases as well as minimizes fog forming on pool surface during refuel

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13
Q

what initiates Standby Gas?

A
  • 41.6” Rx water level
    1. 23 psig drywell pressure

30 mr/hr in fuel pool sweep

3.6 mr/hr FHA exhaust

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14
Q

Which DP transmitter is used for maintaining negative pressure in the Aux building?

A

Higher of the 2 (closest to zero)?

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15
Q

What will trip the exhaust fans (both sets)?

A

F003/F004 < full open

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16
Q

What will trip the FHA supply fans?

A

F011/F012 < full open

17
Q

What will trip fuel pool sweep supply fans?

A

F019/F020 < full open

18
Q

What will trip the fuel pool sweep heating coils?

A

low air flow

19
Q

how do dampers operate?

A

they follow the fan (fan on, they’re open. Fan off, they close)

20
Q

What type of pressure is Aux building maintained at?

A

negative pressure

21
Q

what are the inboard isolation dampers? and what division is it associated with?

A

F004, F011, F019 are Div 1 STBY gas A

22
Q

What are the outboard dampers and what division are they associated with?

A

F003, F012, F020 are Div 2 STBY gas B

Module 7 - CTMT Integrity (9 decks)

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