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Advanced Systems > Primary Coolant Pumps > Flashcards

Primary Coolant Pumps Flashcards

1
Q

LCO 3.4.1 “PCS pressure, temperature, and flow DNB limits” requirement

A

PCS DNB parameters for PZR pressure, cold leg temperature, and PCS total flow rate shall be within limits specified in the COLR

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2
Q

LCO 3.4.1 “PCS pressure, temperature, and flow DNB limits” applicability

A

Mode 1

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3
Q

LCO 3.4.4 “PCS Loops - Modes 1 and 2” requirement

A

2 PCS loops shall be operable and in operation

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4
Q

LCO 3.4.4 “PCS Loops - Modes 1 and 2” applicability

A

Modes 1-2

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5
Q

LCO 3.4.5 “PCS Loops - Mode 3” requirement

A

2 PCS loops shall be operable and one PCS loop shall be in operation

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6
Q

LCO 3.4.5 “PCS Loops - Mode 3” applicability

A

Mode 3

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7
Q

LCO 3.4.5 “PCS Loops - Mode 3” notes/exceptions

A
  • All PCPs may not be in operation for <= 1 hr per 8 hr period, provided no operations arepermitted that would cause reduction f PCS boron concentration, and core outlet temperature is maintained at least 10 F below saturation temperature.
  • Forced circulation (starting the first PCP) shall not be initiated unless PCS cold leg temperature > 430 F, S/G secondary temperature is <= reactor inlet temperature (Tcold), S/G secondary temperature is < 100 F above Tcold and SDC is isolated from the PCS and PCS heatup/cooldown rate is <= 10 F/hr, or S/G secondary temperature is < 100 F above Tcold and SDC is isolated from the PCS and PZR level is <= 57%
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8
Q

LCO 3.4.5 “PCS Loops - Mode 3” required actions if no PCS loop operable or no PCS loop in operation

A

IMMEDIATELY suspend all operations involving a reduction of PCS boron concentration and initiate action to restore 1 PCS loop to operable and in operation

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9
Q

LCO 3.4.6 “PCS Loops - Mode 4” requirement

A

2 loops or trains consisting of any combination of PCS loops and SDC trans shall be operable and either 1 PCS loop shall be inoperation, or 1 SDC train shall be in operation with >= 2810 gpm flow through the core

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10
Q

LCO 3.4.6 “PCS Loops - Mode 4” applicability

A

Mode 4

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11
Q

LCO 3.4.6 “PCS Loops - Mode 4” notes/exceptions

A
  • All PCPs may not be in operation for <= 1 hr per 8 hr period, provided no operations arepermitted that would cause reduction f PCS boron concentration, and core outlet temperature is maintained at least 10 F below saturation temperature.
  • Forced circulation (starting the first PCP) shall not be initiated unless PCS cold leg temperature > 430 F, S/G secondary temperature is <= reactor inlet temperature (Tcold), S/G secondary temperature is < 100 F above Tcold and SDC is isolated from the PCS and PCS heatup/cooldown rate is <= 10 F/hr, or S/G secondary temperature is < 100 F above Tcold and SDC is isolated from the PCS and PZR level is <= 57%
  • P-50A and P-50B shall not be operated simultaneously due to core lift concerns
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12
Q

LCO 3.4.6 “PCS Loops - Mode 4” required actions if 1 PCS loop inoperable and 2 SDC trains inoperable

A

IMMEDIATELY initiate action to restore a second PCS loop or one SDC train to operable

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13
Q

LCO 3.4.6 “PCS Loops - Mode 4” required actions if no PCS loops or SDC trains operable or no PCS loop in operation with SDC flow through the core not within limits

A

IMMEDIATELY suspend all operations involving reduction of PCS boron concentration and initiate action to restore 1 PCS loop to operable and in operation or 1 SDC train to operable and in operation with >= 2810 gpm through the core

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14
Q

What are the differences between P-50A/B/C and P-50D?

A
  • P-50A/B/C have backstop oil pumps, and P-50D has a ratchet and pawl anti reverse rotation device.
  • P-50A/B/C have 2 flywheels (upper and lower), and P-50D only has 1 flywheel
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15
Q

What are the PCP starting interlocks?

A
  • P-50A/B/C - 80 gpm CCW flow and 1700 psig lift oil pressure
  • P-50D - 145 gpm CCW flow and 675 psig lift oil pressure
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16
Q

What are the PCP power supplies?

A

P-50A/C - Bus 1A

P-50B/D - Bus 1B

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17
Q

How many seals do the PCPs have?

A

3 pressure reducing seals and 1 vapor seal

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18
Q

What is the purpose of the PCP vapor seal?

A

Designed to seal against full system pressure in the event that all 3 seals fail.

19
Q

What is the purpose/function of the PCP seal heat exchanger?

A

Cooled by CCW to cool seal water down to 130 F

20
Q

How is PCP seal water flow controlled?

A

Throttling controlled bleedoff manual valve between the seals and the VCT

21
Q

Where is PCP seal water normally routed?

A

VCT

22
Q

Where is PCP seal water routed if all 3 seals and the vapor seal fail?

A

PSDT

23
Q

What is normal PCP seal flow?

A

1-1.25 gpm per pump

24
Q

What are the power supplies for the PCP lift oil pumps?

A

AC - P-80A/B from MCC-3, P-80C/D from MCC-4

DC - P-81A/C from D-10L, P-81B/D from D-20L

25
Q

What causes the PCP AC lift oil pumps to auto start?

A

PCP trip

26
Q

What causes the PCP DC lift oil pumps to auto start?

A
  • Lift oil pressure < 1700 psig (675 psig for ‘D’ pump) for 5 seconds
  • AC lift oil pump trip
  • Auto stops after 5 minutes
27
Q

Why does the DC lift oil pump stop after 5 minutes?

A

Prevents battery drain

28
Q

What are the power supplies for the backstop oil pumps for P-50A/B/C?

A
  • P-83A/B/C - MCC-2

- P-84A/B/C - MCC-7

29
Q

What causes the PCP backstop oil pumps to auto start?

A
  • lift pump start
  • PCP start
  • if opposite backstop pump flow < 0.24 gpm
30
Q

How do we determine if a PCP backstop oil pump is running?

A
  • no control room indication
  • low flow alarm comes in at 0.24 gpm
  • need electricians to use a clamp on ammeter at the breaker cubicle
31
Q

What is indicated by the white indicating light above the PCP handswitches?

A

Pump start interlock from lift oil pressure has been met

32
Q

What is the reason for an abnormal or emergency shutdown of a PCP?

A

Used to prevent motor damage, and to prevent seal damage that could lead to a LOCA

33
Q

What is not required when performing an emergency shutdown of a PCP that is required when performing a normal shutdown?

A

Lift pumps are not required, but it is preferred if the situation allows

34
Q

What are criteria for PCP emergency shutdown?

A
  • any pump bearing high temperature alarm
  • controlled bleedoff high temp 185 F
  • high lower seal temperature 185 F
  • PCP vibration alarm with supporting indications such as abnormal current, rising bearing temperature, or sudden change in PCS flow
  • no PCP backstop oil pump running
  • no CCW flow to containment for > 10 minutes
35
Q

What will happen if you stop a PCP with the reactor reset?

A

Reactor will trip

36
Q

What is the minimum pressure for operating a PCP?

A
  • 250 psia

- can be lowered to 235 psia if using narrow range pressure instrument

37
Q

What is a potential abnormal indication when operating a PCP at low temperature?

A

Vibrations may be higher than normal

38
Q

What is the consequence of starting a PCP with S/G temperature higher than PCS temperature?

A

Larger pressure transient due to sudden heating of the PCS as it flows across the hot secondary water in the S/G

39
Q

What is indicated if a PCP has vibrations indicated while it isn’t running?

A

PCP may be reverse rotating. If the pump is started in this condition, the breaker may open on overcurrent

40
Q

What is the normal pressure breakdown across the PCP seals?

A

2060 psia PCS pressure, down to 1300-1400 psia after the lower seal, down to approximately 700 psia after the middle seal, down to approximately 30-100 psia after the upper seal

41
Q

What are the motor starting duty limitations for P-50A/B/C?

A
  • 3 starts with the pump initially at room temperature

- 2 starts if the pump has been operating continuously for >= 20 minutes, or if it has been idle for >= 40 minutes

42
Q

What are the motor starting duty limitations for P-50D?

A
  • 2 starts if the pump is allowed to coast down to a stop between starts.
  • a third start may be made when winding and core have been cooled by running for >= 20 minutes, or if the pump has been idle for >= 45 minutes
43
Q

What is the concern with starting a PCP with controlled bleedoff pressure less than VCT pressure?

A

Reverse seal flow can occur and damage the seals

Advanced Systems (36 decks)

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