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Area 3 > Fuel systems > Flashcards

Fuel systems Flashcards

1
Q

What is the maximum fuel pool cleanup strainer delta-p?

A

3 psid

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2
Q

What is the maximum fuel pool cleanup filter delta-p?

A

25 psid

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3
Q

If we are placing the PC system on recirc or cleanup, what is our minimum level?

A

133 feet

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4
Q

What are the high, low, and low-low level alarms in the SFP?

A

High- 138’ 2”
Low- 137’ 6”
Low-Low- 137’

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5
Q

What happens if the recycle monitor pump trips during a SFP fill?

A

We need to shut the valve to prevent losing level in the SFP

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6
Q

What concerns do we have when filling the SFP?

A

At 138’ 3” we could overflow to the tray elevator motor

At 138’ 2” we could flood the in-core instrument tubing

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7
Q

What is the minimum canal level for an irradiated fuel movement inside of containment?

A

137’ 9”

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8
Q

What are some T.S’s associated with the SFP?

A
  • boron concentration 2150 ppm (4000-4400 ppm as a borated water source)
  • 23 feet over irradiated fuel assy’s (137’ 4”)
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9
Q

Where can we get makeup for the SFP from?

A

LRS RMT
CST
RWT
RMWT

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10
Q

What cools the SFP HX?

A

NCW

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11
Q

What is the backup source of cooling for the SFP HX?

A

Essential Cooling Water

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12
Q

For the SFP Cooling and cleanup system where does the suction line and discharge line’s go into the spent fuel pool at?

A

The suction line takes a suction off of the top part of the SFP while the discharge line delivers water into the bottom of the pool assisting in natural convection cooling.

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13
Q

How far must water level be kept over the top of irradiated fuel in the SFP?

A

23 feet (137’ 4”)

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14
Q

What is the SFP temperature high and hi-hi alarms in the control room?

A

High- 125 degrees F

Hi-Hi- 145 degrees F

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15
Q

What are the normal operating conditions for the PC cooling pumps?

A

50 psig pump discharge pressure
95-100 degrees F SFP Temp
2000 gpm flow rate with one pump running

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16
Q

What are the normal operating conditions for the PC cleanup pumps?

A

80-85 psig
95-100 degrees F SFP temp
150 gpm flow rate with one pump running

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17
Q

What is the power source for the PC Cooling pumps?

A

PG

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18
Q

What is the power source for the PC cleanup pumps?

19
Q

During high heat load periods or refueling; what system can be used to help carry the SFP load?

A

The Safety injection system through the use of the shutdown heat exchanger

20
Q

When will the control room get a hi or low pressure alarm for the fuel pool cleanup pump?

A

HI- 95 psig

Low- 67 psig

21
Q

When will the control room get a hi or low pressure alarm for the fuel pool cooling pumps?

A

Hi- 60 psig

Low- 45 psig

22
Q

What do we want to maintain SFP temperature at?

A

95-100 degrees F

23
Q

On our area 3 logs, when do we notify the control room of a higher then normal SFP temperature?

A

115 degrees F

24
Q

The N2 bottles for the cask pit/decon area should be reported as being low at what pressure?

25
Q

Describe the spent fuel pool

A
  • stainless steel lined
  • concrete walled
  • 340,000 gallons (at 38’) about 45% of RWT
26
Q

Where can we get makeup to the SFP?

A
  • RWT
  • LRS/RMT
  • CST
  • RMWT
  • In emergency FP or DW via hoses
27
Q

How are the fuel assemblies arranged in the SFP?

A

Checkerboard array in order to preclude inadvertent criticality

28
Q

What will automatically stop the PC cooling pumps?

A

A load shed signal or Electrical protection trip

29
Q

After a load shed signal; how does the PC cooling pumps restart?

A

Must be manually restarted after a load shed once power has been restored

30
Q

How is the fuel transfer tube isolated when not in use?

A

PCN-V118 spent fuel pool side

Quick operating closure device- containment blg side

31
Q

What advantage does the QOCD give us over a flange?

A

The QOCD can be removed or installed remotely from the operating floor so no personnel are required to enter the refuel cavity

32
Q

Where are the valves we operate when transferring water from the CST to the SFP?

A
  • One in CST pump house
  • One on 120’ FB
  • Transferred by CT transfer pump
33
Q

What pump do we use to fill the SFP with the RWT?

34
Q

What are some things to know about the underwater lights in the SFP?

A

They are cooled by the water. If level goes down and the lights are exposed they could overheat/burnout.

35
Q

What is the purpose of the siphon breakers in the SFP?

A

Limit SFP drain down in the event that a line breaks

36
Q

Explain the Fuel Transfer tube.

A
  • 36” stainless steel tube

- Connects Spent Fuel pool and Refuel pool

37
Q

Explain the QOCD?

A

Quick operating closure device

  • Class boundary between fuel building and containment
  • Reduced time/dose associated with installing the blind flange.
  • Qperated (remove/installed) from the operating deck
38
Q

Where is the fuel pool cleanup pumps suction anti-siphon hole?

39
Q

Where is the fuel pool cleanup pumps discharge anti-siphon hole?

A

132’ 6”

40
Q

Where is the BAMP suction anti-siphon hole?

A

133’ 6”

41
Q

What is the maximum number of fuel assy’s in the SFP?

42
Q

What are the class/non-class gate seals?

A

Decon pit-SFP Class
Decon pit- Cask pit Class
SFP - transfer canal Non Class

43
Q

What is the difference between the Class and non-class gate seals in the SFP area.

A
  • Class seals are provided IA and have N2 backup lined up automatically.
  • Non-class seals are provided IA and have N2 backup. It is required to be manually aligned when IA is lost.
44
Q

What do AO’s do during cask loading operations?

A

Fill and drain the cask loading pit

Area 3 (6 decks)

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