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Module 5 - Reactivity Control > B33 - Recirc > Flashcards

B33 - Recirc Flashcards

1
Q

What are signs of a seal #1 failure?

A

2 pressure high

staging flow high

Seal temp drop

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2
Q

What are signs of a seal #2 failure?

A

2 seal pressure low

Low staging flow

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3
Q

What are the signs of pressure breakdown orifice plugging?

A

2 seal pressure low (could reach 0)

Low staging flow

Both seal temps high

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4
Q

What are the signs of #1 and #2 seal failure?

A

Seal pressure low in both seal cavities

staging flow low

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5
Q

What are signs of staging flow orifice plugging?

A

2 seal pressure approaching seal #1 pressure

staging flow low

both seal temps rise

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6
Q

What setpoints send both HPUs to Maintenance?

A

< 1650 psig discharge pressure

> 150 deg F oil hot

< 60 gallons oil empty

1.23 psig drywell pressure

FCV control signal abnormal

HPU shutdown pushbutton

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7
Q

What alarm comes in when both loops are in maintenance?

A

FCV A/B motion inhibit

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8
Q

What signals transfer HPU to STBY loop?

A

< 1650 psig discharge pressure

> 145 deg F oil warm

<70 gallons tank low

Overcurrent/undervoltage

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9
Q

What are the breaker interlocks?

A

CB2 and CB5 can’t be closed at the same time

To close CB2 A or B, CB5 A AND B must be open, CB1 must be closed

opening CB1 opens CB2

CB5 must be open to close CB3 or CB4

opening CB3 or CB4 opens CB5

Suction or discharge < 90% open, trips open CB2 and CB5

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10
Q

What is the logic for a fast start?

A

> 3 mlbm/hr feedwater flow

start opens CB1 and CB2 and starts a 40 second timer

After 3 seconds CB5 closes

95% speed, 40 second timer resets

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11
Q

What is the slow start logic?

A

< 3 mlbm/hr feedwater flow

CB5 and CB1 close/ 40 second timer starts

@95% speed, CB5 opens

@25% speed, CB2 closes/ 40 second timer resets

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12
Q

What’s the sequence for manually downshifting a recirc pump to slow speed?

A

Press both downshift buttons simultaneously

CB5 A/B opens

CB1 A/B closes to start LFMGs

@ 25% speed, CB2 A/B close

If 40 second timer times out before 25% CB1 and CB5 trip

Trip XFER INC annunciator comes in

(no interlocks, but SOI directs FCV to min before downshift)

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13
Q

What are the start permissives?

A

Suction/discharge > 90% open

CB5 racked in

FCV at min ED (approx 22%)

FCV manual

Stop-Lock not depressed

Incomplete sequence reset

Thermal interlocks met

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14
Q

What pressures should be seen on Recirc Seals?

A

Seal #1, 1050 psig

Seal #2, 525 psig

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15
Q

What provides purge to recirc seal and how much?

A

CRD provides 1.5 - 2gpm purge pressure to seal

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16
Q

what are the setpoints for Recirc pump thermal shock setpoints?

A

50 F diff temp loop to loop

50 F diff temp loop to dome

100 F diff temp Dome to drain

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17
Q

What do the Recirc pump thermal shock setpoints interlock prevent?

A

(50,50,100)

Prevents pump start or upshift

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18
Q

What is min ED for the recirc FCV

A

22-24%

19
Q

How fast do FCV move in fast detent and slow detent?

A

Fast = 1.6%

Slow = .16%

20
Q

What are the electrical and hydraulic limits?

A

Electrical: open 11%, closed 11%

Mechanical: open 30%, closed 60%

21
Q

How many pumps do you upshift at a time?

A

1

22
Q

How many pumps do you downshift at a time?

A

2

23
Q

How much flow do recirc pumps provide?

A

44,600 gpm or 16.9 mlbm/hr (driving flow)

24
Q

What is rated core flow?

A

112.5 mlbm/hr

25
Q

What is flow rate of steam and feed flow?

A

18.9 mlbm/hr

26
Q

What RPM are recirc pumps running in fast/slow speed?

A

Fast = 1800 rpm

slow = 450 rpm

27
Q

What are the cavitation interlocks for recirc pumps?

A

<7.4 delta T between reactor sat temp and recirc for 15 seconds

11.4” reactor water level

< 3 mlbm/hr for 15 seconds feedwater flow

28
Q

what is the result of a cavitation signal?

A

Downshift

29
Q

What are the power supplies for recirc pumps?

A

A - 11HD

B - 12HE

30
Q

What are the power supplies for LFMG?

A

A - 13AD

B - 14AE

31
Q

What are the power supplies for LFMG voltage regulators?

A

A - 13B21

B - 12B11

32
Q

What are the ATWS/ARI setpoints?

A

-41.6”

> 1126 psig Rx pressure

Arm and depress both pushbuttons

33
Q

What are the pump supplies for ATWS/ARI-RPT with what channels they power and what breakers do they trip?

A

E channel 1 trips breakers 2 and 5 (1,2,5)

K channel 2 trips breakers 1 and 4 (2,1,4)

34
Q

How long does it seal for and how is it reset?

A

32 seconds (reset with pushbuttons)

35
Q

How does the recirc pump respond to this trip?

A

Trip off

36
Q

What are the EOC-RPT setpoints?

A

TSV < 675 psig bypassed < 26% Rx power

TCV < 970 psig bypassed < 26% Rx power

37
Q

What are the power supplies to each division of EOC-RPT and what breakers do they trip?

A

Div 1 11DA channel 1 trips breaker CB3 A/B

Div 2 11DB channel 2 trips breaker CB4 A/B

38
Q

How do recirc pumps respond to this?

A

downshift

39
Q

What is the loop match criteria?

A

< 70% flow rate within 10% 4460 gpm

> 70% flow rate within 5% 2230 gpm

40
Q

When a FCV runback occurs, what does flow rate reduce to?

A

55%

41
Q

What are the signs of a loss of purge flow?

A

Slight rise in seal temp (no alarms)

42
Q

What are signs of loss of CCW?

A

Rise in seal temps

43
Q

What are the signs of loss off both CCW and purge flow?

A

Rapid temp rise on both seals

high temp alarms on both seals

Module 5 - Reactivity Control (5 decks)

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