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Advanced Systems > SFP Cooling > Flashcards

SFP Cooling Flashcards

1
Q

What is the purpose of the SFP Cooling System?

A

Removes decay heat from spent fuel stored in the SFP

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2
Q

What is the design SFP temperature maintained by the SFP Cooling System?

A

150 F with a minimum of 1 SFP Cooling Pump operating

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3
Q

What design features of the SFP Cooling System prevent from draining the SFP?

A
  • There are no drains in the SFP
  • Inlet/outlet piping enter the SFP at a high enough level that, if the piping failed, adequate level would be maintained for shielding and cooling
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4
Q

What are the power supplies for the SFP Cooling Pumps?

A

P-51A - MCC-7

P-51B - MCC-8

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5
Q

What is the flow capacity of the SFP Cooling Pumps?

A

1700 gpm each

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6
Q

SFP Heat Exchangers design?

A
  • 2 heat exchangers in series
  • SFP water on the tube side, CCW on the shell side
  • Designed to withstand a temperature transient of 60 F to 212 F in 5 seconds
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7
Q

Where can SFP level be monitored from?

A
  • Control Room via camera or digital level indicator
  • Locally at the SFP
  • C-40 via digital level indicator
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8
Q

Where can SFP temperature be monitored from?

A
  • Control Room via camera or PPC

- Locally at the SFP

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9
Q

What temperature is the SFP normally maintained at?

A

75 F to 125 F

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10
Q

What are the SFP temperature limits?

A

68 F to 150 F

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11
Q

What are the PPC SFP temperature alarms?

A

Lo - 75 F
Hi - 125 F
Hi-Hi - 140 F

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12
Q

What are the SFP level alarms?

A

Lo - 646’

Hi - 647’ 10”

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13
Q

What is the SFP Booster Pump power supply?

A

MCC-8

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14
Q

What is the design flow rate of the SFP Booster Pump?

A

160 gpm

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15
Q

What are the design ratings of the SFP Heat Exchanger (flow, pressure, temperature)?

A

150 gpm
200 psig
220 F

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16
Q

What is the interface between the SFP Cooling System and the SDC System?

A

Temporary connections are provided to allow the SDC System to be used to cool the SFP in the event of an equipment failure or full core offload

17
Q

What is the interface between the SFP Cooling System and the SIRWT?

A
  • Water can be transferred between the 2

- P-51B can be used to recirc the SIRWT

18
Q

What is the interface between the SFP Cooling System and the Fire Protection System?

A

Fire Protection System provides an emergency supply of makeup water to the SFP

19
Q

What is the interface between the SFP Cooling System and the PMU System?

A

PMU is a source for filling the SFP

20
Q

Precautions for filling the SFP

A
  • SFP level shall be continuously monitored via camera from the Control Room, or locally.
  • SFP level should not be allowed to be higher than 3” below the skimmers due to known liner leaks
21
Q

Precautions for SFP level and LPSI Pump monitoring when using SDC for SFP Cooling with a full core offload

A

monitored continuously until stable for 10 minutes, and then hourly after that

22
Q

Tech Spec 3.7.14 “SFP Water Level” LCO statement

A

water level shall be >= 647’ elevation

23
Q

Tech Spec 3.7.14 “SFP Water Level” applicability

A

during movement of irradiated fuel assemblies in the SFP or during movement of a fuel cask in or over the SFP.

24
Q

Tech Spec 3.7.14 “SFP Water Level” required actions in less than 1 hour

A

If level is not within limits, the IMMEDIATELY suspend movement of irradiated fuel assemblies in the SFP and suspend movement of the fuel cask in or over the SFP

25
Q

Tech Spec 3.7.15 “SFP Boron Concentration” LCO statement

A

SFP Boron Concentration shall be >= 1720 ppm

26
Q

Tech Spec 3.7.15 “SFP Boron Concentration” applicability

A

When fuel assemblies are stored in the SFP

27
Q

Tech Spec 3.7.15 “SFP Boron Concentration” required actions in less than 1 hour

A

If boron concentration not within limit, then IMMEDIATELY suspend movement of fuel assemblies in the SFP and initiate actions to restore boron concentration within limit

28
Q

Tech Spec 3.7.14 “SFP Water Level” basis

A

647’ meets the assumptions for the iodine decontamination factors following a fuel handling or cask drop accident

29
Q

Tech Spec 3.7.15 “SFP Boron Concentration” basis

A

Ensures sub criticality is maintained for a dropped spent fuel assembly accident or loading of a spent fuel assembly with improper burnup or enrichment

30
Q

ORM 3.17.6.19 “SFP Area Radiation Monitors”

A

If a SFP radiation monitor becomes inoperable, fuel moves in the SFP are to be stopped IMMEDIATELY until monitoring capability is restored

Advanced Systems (36 decks)

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