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Catawba Nuclear Station > Fire Protection(RFY) > Flashcards

Fire Protection(RFY) Flashcards

1
Q

What is the purpose of the Fire Protection System?

A

The Fire Protection Systems are designed to control and extinguish fires that may occur with building, yard, and transformer areas by automatic and manual means.

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2
Q

What will automatically start the Main Fire Pumps?

A

Pump/Service Building/RL Intake

A Pump - 95psig/70psig
B Pump - 90psig/65psig
C Pump - 85psig/60psig

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3
Q

What is the normal Fire Protection System Pressure?

A

Approximately 125psig

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4
Q

What are the power supplies to the Main Fire Pumps?

A

A pump - 1TC
B pump - 1FTB
C pump - 2FTA

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5
Q

What are the Main Fire Pump Suction sources?

A
  1. ‘C’ Fire Pump takes a suction on the ‘C’ RL Pump intake bay
  2. ‘A’ and ‘B’ Fire Pumps take suction on a separate shared intake bay
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6
Q

What is the purpose of the Recirculation Pumps?

A

The purpose of the Recirculation Pumps are used to carry out flow tests, flow loop testing, and flushes of the system.

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7
Q

What is the purpose of the Jockey Pumps(D, E, F) in the RY Treatment Building?

A

The Jockey Pumps run to maintain system pressure during normal operation at approximately 125psig using clean/treated water from the RY Recirculation Tank.

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8
Q

Which Jockey Pumps are normally in operation?

A

‘D’ or ‘E’ Jockey Pumps, one of them will be continuously in service in “hand-on”. This provides for recirculation of the Recirculation Tank and for maintaining normal service pressure.

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9
Q

What will cause the standby Jockey Pumps to automatically start?

A
  1. RY pressure decreases to 117psig, the standby Jockey Pump, either ‘D‘ or ‘E’ will start.
  2. RY pressure decreases to 112psig, ‘F’ Jockey Pump will start.
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10
Q

What are the staggered timer settings for the Jockey Pumps and what is their purpose?

A

When the Jockey Pumps automatically start timers will turn off the pumps at:

  1. ‘D’ and ‘E’ Jockey Pumps are set for 15 minutes
  2. ‘F’ Jockey Pump is set for 20 minutes

The staggered timers prevent two pumps from stopping at the same and causing a pressure surge in the piping

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11
Q

What is the purpose of the Backup Secondary Jockey Pumps?

A

The Backup Secondary Jockey Pumps prevent frequent starting of the fire pumps by maintaining pressure in the yard mains at approximately 125psig by replenishing water lost by leakage in the mains.

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12
Q

What are the suction sources for the Backup Secondary Jockey Pumps?

A
  1. Normally aligned to Filtered Water(YF)

2. Can be aligned to Low Pressure Service Water(RL) as a backup

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13
Q

What will automatically start the Backup Secondary Jockey Pumps and when?

A
  1. The Backup Secondary Jockey Pumps will start based on Pressurizer Tank level
  2. Auto Starts:
    A. ‘A’ and/or ‘B’ if in AUTO at 35%
    B. ‘A’ and/or ‘B’ if in OFF at 29%
    C. ‘C’ at 27%
  3. All pumps will stop at 39%
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14
Q

What is the purpose of the Pressurizer Tank?

A
  1. The Pressurizer Tank acts as a surge volume and helps eliminate water hammer
  2. Maintains the system pressurized using a water volume and a nitrogen overpressure to maintain 140psig
  3. The nitrogen will makeup to maintain tank pressure until level gets to less than 36% to prevent filling the fire piping with nitrogen
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15
Q

What is the purpose of the Alarm Check Valves?

A
  1. They are used in automatic wet-pipe sprinkler systems
  2. As water flows through the check valve the valve clapper is lifted.
  3. The clapper being lifted allows a flow path to a pressure switch causing its contacts(6 psig) to close providing an alarm in the Control Room.
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16
Q

What is the design/purpose of the Water Driven Local Alarms?

A
  1. Used in sprinkler systems with 20 or more sprinkler heads.
  2. Alarms are produced by water driven bell
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17
Q

What is the design/purpose of the Mulsifyre Deluge Systems?

A
  1. Automatic system designed to deliver large quantities of water to totally engulf equipment
  2. Used to protect equipment containing significant quantities of oil
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18
Q

What are some examples of equipment protected by Mulsifyre Deluge Systems?

A
  1. Transformers
  2. Main Turbine Lube Oil Tanks
  3. Main Turbine Transfer Tanks
  4. Main Feed Pumps
  5. Hydrogen Seal Oil Units
  6. Purifiers
  7. Lube Oil Station
19
Q

What are the three Fire Protection System penetrations in the Reactor Building?

A
  1. Automatic wet-pipe sprinkler system for the Annulus
  2. Manual Dry-pipe sprinkler system for Containment
  3. Manual Dry header for hose stations in Containment
20
Q

Which Fire Protection System reactor building penetration is normally not isolated?

A

The Annulus wet-pipe sprinkler system penetration is normally open

21
Q

What does the Manual Dry-Pipe Sprinkler System in Containment service?

A
  1. NC pump motors
  2. Pipe chase area
  3. Lower containment carbon filters
22
Q

What is the function of the Clapper Valves in the Mulsifyre Deluge Systems?

A

They function to isolate the open water spray nozzles from the water supply. The clapper valve is normally held closed by a latch pin assembly connected to a diaphragm.

23
Q

What will actuate the Mulsifyre Deluge Systems?

A
  1. Heat actuated fire detectors(thermal detectors)
  2. Remote pull stations
  3. Local pull stations
24
Q

What type of Fire Protection System protects the Main Turbine Bearings?

A
  1. The Main Turbine Bearings are protected by the Turbine Bearing Deluge System.
  2. The Turbine Bearing Deluge System is a manual pre-action sprinkler system.
  3. The purpose of the system is to deliver large quantities of water while reducing the potential of equipment damage due to erroneous discharge of water.
25
Q

How are erroneous discharges of water prevented by the Turbine
Bearing Deluge System?

A
  1. The sprinkler heads are not open, they are the same used in automatic wet-pipe sprinkler systems, which require heat to open them.
  2. The piping in the is normally full of station air(VS), and the air is released when the sprinkler heads open. This pressure change gives an alarm in the Control Room.
  3. Water spray is MANUALLY aligned if it’s determined the alarm is an actual fire. This is done by manual pull station in the Control Room or locally next to the MTOT or at the deluge valve.
26
Q

Where are the three locations that Turbine Bearing Deluge can be Initiated from?

A
  1. Control Room pull station
  2. Pull station by the MTOT
  3. Pull station at the deluge valve
27
Q

What is the Turbine Bearing Deluge System piping pressurized with at the sprinkler heads?

A

Station Air(VS)

28
Q

What is the design of the deluge systems for Carbon Filter Protection?

A
  1. The deluge for the Carbon Filters is manually initiated locally by the AOs
  2. There are two manual isolation valves in the supply line with one drain valve in between.
  3. The manual isolation valves are normally closed, and the drain valve is maintained open to ensure any leakage from the first isolation is directed to drains and not the carbon bed.
  4. High carbon bed temperatures will give an alarm in the Control Room
29
Q

What is the purpose of the D/G Cardox Fire Suppression System?

A
  1. Provides an automatic source of fire suppression to extinguish fires in the D/G rooms
  2. Provides a source of CO2 for purging hydrogen from the main generator
30
Q

What maintains the proper pressure in the D/G Cardox Tank?

A

The D/G Cardox tank is equipped with a refrigeration compressor for maintaining CO2 in a saturated condition from 305psig - 295psig

31
Q

What is the capacity of the D/G Cardox Tank, and what can that provide for?

A

The capacity of the D/G Cardox Tank allows for two dumps of CO2 to the D/G rooms, and enough to purge the main generator of hydrogen.

32
Q

What is the minimum D/G Cardox Tank level required by SLC?

A

Greater than or equal to 44 percent

33
Q

What is the automatic sequence of a D/G Cardox dump?

A
  1. Thermal detector alarms and starts a 5 minute timer
  2. After 5 minutes:
    A. Header isolation opens after five minutes pressurizing the header up to the individual D/G Room selector valves.
    B. A 1.5 minute timer starts for opening the selector valves
    C. A 2.5 minute timer starts for closing the selector valves
  3. After 6.5 minutes(total) the selector valve opens dumping CO2 to the D/G Room.
  4. After 7.5 minutes(total) the selector valve closes completing the cycle
34
Q

How does the D/G Cardox sequence change by pushing the manual electric pushbutton outside the D/G Room?

A

There is no change the timing is the same

35
Q

What affect does a loss of power have on the D/G Cardox System?

A
  1. Upon a loss of power the CO2 header isolation will fail open pressurizing the header up to the selector valves
  2. The selector valves for the individual rooms are manually opened, which will initiate a 1.5 minute timer and siren
  3. The discharge must be manually terminated by closing the selector valve
36
Q

What is the design of the Auxiliary Feedwater Pump Rooms CO2 System?

A
  1. 18 cylinders at 100lbs each
  2. There are 9 main cylinders, and 9 reserve cylinders
  3. Has the same timing sequence as the D/G Cardox System
37
Q

How is the D/G Cardox System disabled?

A

There is a manual pushbutton outside of the D/G Rooms that when push will electronically isolate the discharge sequence

38
Q

How is the CA Pump Room CO2 manually initiated?

A

There are toggle switches outside of each individual pumps’ pit that will cause the same discharge sequence as the automatic operation.

39
Q

How is the initiation of the CA Pump Room CO2 disabled, and what are the exceptions?

A
  1. There is an ABORT/ENABLE switch outside the pump room that allows the discharge sequence to be electrically isolated.
  2. The discharge cannot be terminated if initiated by the manual discharge switch OR after the 5 minute pre-discharge timer.
40
Q

What are the Revised Design Basis Threat Response(B.5.B) requirements for Fire Protection?

A
  1. Required a portable pump which is not reliant on site power or piping
  2. Must be independently powered and have fuel for 12 hours
  3. A Hale portable pump was purchased to meet these requirements
41
Q

What are the specifications of the Hale Portable Pump?

A
  1. 300 horsepower
  2. Pump capacity:
    A. 1500gpm drafting off of the lake
    B. 3000gpm if using a pressurized source of water such as RY or YD
  3. Discharge can be connected to 2.5 inch or 5 inch hose
42
Q

What are the two locations where the B.5.B equipment is stored?

A
  1. Warehouse #1 in the Extensive Damage Mitigation Guideline Storage Area
  2. In a separate trailer(hose trailer)near the Hale Pump. The Hale Pump is stored on the south side of the plant under a carport
43
Q

What are the power supplies to the Backup Secondary Jockey Fire Pumps?

A

A - 1MXW
B - 2MXW
C - 1MXX

Catawba Nuclear Station (72 decks)

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