Recirc and VFD Flashcards

1
Q

What is 100% core flow?

A

77 Mlbm/hr

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2
Q

What is rated feedwater flow?

A

12.8Mlbm/hr

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3
Q

What powers the Discharge (F031A/B) and Discharge Bypass (F032A/B) valves?

A

Same division opposite unit 480V E bus

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4
Q

What causes auto closure of Discharge and Discharge bypass valves?

A

LPCI initiation AND RPV pressure <310psig

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5
Q

What is the power supply for the Suction valves (F023A/B)?

A

Same unit division 480V e bus

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6
Q

What auto closes the Sample valves (F019, F020)?

A

Group 1 signals LL3 (45”) or Low condenser Vacuum (10”) ONLY

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7
Q

What is the air supply for each sample valve?

A

F019 - N2 F020 - Air

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8
Q

What are the recirc pump start permissives?

A

Seal Staging valve in manual/open Switchgear control power available Suction Valve Open Bypass Valve Open Discharge valve open

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9
Q

What will trip the RCR Input Circuit Breaker (and trip a RCR pump)?

A

Discharge valve <90% open AND Bypass valve not full open

Suction valve <90% open

ATWS ARI signal (LL2 105” or RPV pressure 1137.8psig)

UV on B bus

Overcurrent (ICB or VFD output)

Overfrequency (VFD output)

Emergency stop PB

Open Breaker PB

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10
Q

What actions are required if RBCCW is lost to a recirc pump?

A

Restore or secure pump in 10 minutes

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11
Q

What actions are required if RBCCW and CRD flow are lost to a recirc pump?

A

Secure pump in 90 seconds

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12
Q

What are the temperature requirements to start the 1st recirc loop? (no loops running)

A

TOP to Bottom <= 145dF

AND

Loop to Vessel <= 50dF

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13
Q

What are the temperature requirements to start the second recirc loop? (one already running)

A

Top to Bottom <=145dF

AND

Loop to Loop <= 50dF

AND

Operating loop <= 50% flow (23,500gpm U1/ 24500gpm U2)

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