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Module 4 - Inventory Control > N21 - Feedwater > Flashcards

N21 - Feedwater Flashcards

1
Q

When is manual control used?

A

< 100 rpm

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2
Q

When will the controller auto swap from speed auto to manual? (going down)

A

< 300 rpm

Speed sensor fail hydraulic servo slave failure

both stop valves not full open

turbine trip

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3
Q

When is it preferred to swap from speed auto to feed auto?

A

2100 rpm

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4
Q

When will it auto swap from feed auto back to speed auto?

A

Speed signal exceeds the HSS limit (High speed stop)

speed below LSS limit

Signal “bad quality”

signal processing circuit fail (slave module)

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5
Q

When is emergency manual activated?

A

when digital control senses Hydraulic servo slave module is not in communication with the multi-functional processor

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6
Q

What is a risk of emergency manual mode?

A

OVERSPEED because there is no feedback to INFI-90

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7
Q

What’s the power supply for the RFPT speed control?

A

1Y99

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8
Q

Where does the RFPT turbine exhaust to?

A

HP condenser

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9
Q

What power levels is Start-up level control used for?

A

0-20%

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10
Q

What Rx power can you go to with the loss of HP feedwater heater string?

A

95%

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11
Q

What should vacuum be maintained at when the turbine is in operation? (vacuum in the RFPT lube oil tank)

A

> .5” wc or write a CR

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12
Q

How many low pressure steam poppets are there?

A

7

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13
Q

How many high pressure steam poppets are there?

A

1

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14
Q

Which poppets are used during start up? (low or high pressure poppets)

A

High pressure

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15
Q

At what reactor pressure, should you put in a feed pump?

A

400 psig

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16
Q

what’s the purpose of the feedwater system? (3)

A
  1. provides high pressure makeup water to make up for steam produced in the reactor during all modes of operation.
  2. preheats the water to 420 deg F
  3. Provides recirc flow path from common header back to hotwell. Also for heater drain clean-up
17
Q

What does the HPU control?

A

Governor

18
Q

What percent are the reactor feed pumps brought online?

A

< 8% they windmill off condensate booster pump

8% one pump

Approx 50-65% (no higher than 65), 2 pumps

19
Q

What must min/flow valve be in, to start be in to start feed pumps?

A

cascade

20
Q

What’s the purpose of the vacuum trip?

A

Protect the RFPT casing (backpressure)

21
Q

How does the min/flow valve operate? (for feed pumps)

A

Works off percentage of pump speed

22
Q

What must be running to “windmill” RFP using condensate booster pumps?

A

Oil pump

23
Q

What does nitrogen accumulator do for RFP HPU?

A

Smooth out pressure pulsations from pump piston, and provide a surge volume to maintain pressure constant

24
Q

What’s the function of the kidney loop?

A

takes suction from reservoir and recircs it through filter and heat exchanger

25
Q

What’s the purpose of long cycle cleanup? (flow path)

A

Goes through condensate pumps, through CFFF, condensate booster pumps, LP heaters, Rx feed pumps, HP heaters, back to the condenser to remove stagnant, low purity water

26
Q

What’s the purpose of short cycle clean up? (flow path)

A

Flow through condensate pumps, through CFFF, back to condenser through min-flow valve.

27
Q

Where does the back-up (EOP) pump get its power from?

A

“F” bus

28
Q

How does the pump suction valve (F029A/B) react to low lube oil pressure?

A

Auto closes @ <4 psig, resets @ 7 psig

29
Q

Will an HPU trip directly trip a RFPT?

A

NO

30
Q

When will Emergency DC oil pump auto start?

A

50 psig

31
Q

Where do the RFPs receive sealing water from?

A

Condensate booster pumps

32
Q

Where are the reactor feed pump suction valves operated from?

A

P175

33
Q

Where are the 2 places the RFPT can get its steam from, and when is each place used?

A

Equalizing header @ start-up

2nd stage MSR (outlet) at power

34
Q

What are the RFPT trips?

A
  • SSCCORED How Many Bearings (3)

S - suction love pressure <= 157 psig (15sec A, 45sec B)

S- suction low flow 90% 5 min (admin manual trip) <80% 30 sec TD Auto trip

C- HP control oil press low <=75 psig

C- HPU header <= 1400# AND BOTH pump discharge <= 1500# (5 sec TD)

O- Overspeed mechanical or electrical >= 6100 rpm

R- RPV Level 9, 58” (1 sec TD)

E- Exhaust vacuum low <= 16” Hg vacuum

D- Deviation in Governor position/demand 20%

How - High discharge pressure >= 1580 psig

Many - Manual

Bearings - Thrust bearing wear detector high >= 40#
Turbine oil <= 4#
Pump oil <= 4#

35
Q

What are the HPU trips?

A

Standby pump starts at 1500 psig

> 11” from top of tank LO-LO in reservoir

< 65 deg F temp in reservior

36
Q

What is the power supply to the lube oil pumps?

A

A - 13BD1

B - 12BE6

37
Q

When does the standby lube oil pump auto start?

A

< 222 psig

38
Q

What is power limited to with one feed pump?

How long?

How many times per year?

then what must be done?

A

80%?????

3 hours

4 times per year

Reduce to 78.5% power

Module 4 - Inventory Control (8 decks)

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