What makes a fire barrier operable?
- Fire doors must either be closed or equipped with a self‑closing device.
- Fire dampers must either be closed or equipped with a self-closing device.
- All other fire barriers must be maintained in a functional condition.
- For sub-volume and exterior wall barriers to be functional:
- Doors must be closed and latched when not in use.
- All other sub-volume and exterior wall barriers must be maintained in a functional condition.
How do non-functional fire barriers get handled?
When a fire, sub-volume, and/or exterior wall barrier is non-functional the Shift Manager shall:
- Initiate appropriate compensatory measures in accordance with the barriers safety significance.
- High Safety significance
- Low Safety significance
- Non-NFPA 805
- Notify Security to initiate the required compensatory measures.
- Verify non-functional fire barrier has a Condition Report written.
- Review and sign the Fire Tour Cover Sheet prior to initiating or securing compensatory measures.
What is Defense in Depth?
- Fire Prevention
- Fire Detection
- Fire Containment
- Fire Suppression
Typically piping arrangement to the sprinklers and hose stations is such that no single failure would render both systems unavailable. Where is this not done?
One exception is the water supply to the Charging Pump Room sprinklers
Line break could cause loss of both the sprinklers and hose station
What is a fire barrier?
- Fire Doors
- Fire Dampers
- Fire Rated Assemblies: fire walls, ceilings, floors plugs, fire barrier penetration seals
- Fire Protection Assemblies: radiant heat shield between P-41 and P-9A/B
- Sub-Volume and Exterior Walls: walls, doors
What are the actions associated fire detection and or protection out of service within a High Safety Significant Area?
When a Fire Detection System in a HSS area is non-functional:
- IF automatic suppression is functional in the area, THEN implement an hourly fire tour within one hour.
- IF automatic suppression is non-functional, THEN implement a continuous fire tour within one hour.
If Door 167B, Scuttle Hatch From CCW Room to “West” ESG is open, what must be functional?
If in Mode 1, 2 and 3
Auxiliary Feedwater Pump P-8A shall be OPERABLE
What must be done if Door 167,CCW Room to 590 Corridor is blocked open?
Floor Plugs to be in place in Door 167 is Open
- East Engineered Safeguards
- West Engineered Safeguards
- Spent Fuel Pool (above East Engineered Safeguards Floor plugs)
What are the type of fire dectors utilized here?
- Ionization Detectors
- Photoelectric Detectors
- Ultraviolet Detectors
If the required fire protection equipment is non-functional (i.e., required fire fighting equipment missing or defective) what must be done?
The non-functional fire protection equipment shall be replaced within one (1) hour OR
Additional fire hose capable of reaching the unprotected area shall be provided within one (1) hour at an functional fire hose reel station, fire hose rack, or fire hydrant hose house.
What are the effects of water spray on electrical equipment?
To prevent potential of electrical shock maintain maximum distance while still maintaining spray on fire
All nozzles used within the plant (with the exception of hydrant houses) are electrically safe fog type nozzles
Nozzles are pinned to prevent opening beyond the 30° position thus maintaining fog spray
What is the output and pressure of the fire pumps?
- Three 100% capacity, 3-stage Vertical Turbine Pumps rated at 1500 gpm at 125 psig (each)
- Capable of providing 2250 gpm at 81 psig. 150% of output at 65% pressure.
What is P-9A power supply and its automatic starting pressure?
Power Supply – Bus-13, Bkr 52-1305
PS-1311 starts pump at 98 psig fire main pressure
Where can P-9A be started?
Locally only at C-36. Indication and alarm for start in control room.
When does P-9B Start?
PS-1310 @ 83 psig lowering.
What are the details of starting/stopping P-9B from control room and locally?
- P-9B, Diesel Driven Fire Pump, can be started and stopped using P-9B/CS, Diesel Driven Fire Pump P-9B, in the Control Room.
- If P-9B was started by low system pressure or low system pressure has actuated while running, the ability to stop P-9B from the Control Room is no longer available.
- If P-9B is started from the Control Room, it must be stopped from the Control Room. If P-9B has been started locally, it cannot be stopped from the Control Room.
What auto starts P-41?
PS-5350 @ 68 psig lowering
What are the details of starting/stopping P-41 from control room and locally?
- P-41, Diesel Driven Cooling Tower Fire Water Pp, can be started and stopped using P-41CS, Diesel Driven Fire Pump P-41, in the Control Room.
- If P-41 was started by low system pressure or low system pressure has actuated while running, the ability to stop P-41 from the Control Room is no longer available.
- If P-41 is started from the Control Room it should be stopped from the Control Room. Starting from the Control Room and stopping locally leaves a standing start signal. If the pump is placed back in AUTO, it would start.
- If P-41 has been started locally, it cannot be stopped from the Control Room.
Where are the fire pump control switches?
P-9A
- C-36 locally only.
- Push Button
- T-Handle
- Indication only in Control Room
P-9B
- Locally
- C-13
- Green/Red/Yello
- Yellow - Not in Auto
P-41
- Locally
- C-126
- Green/Red/Yello
- Yellow - Not in Auto
How does P-13, Jockey Pump start/stop?
Maintains header pressure to prevent water hammer.
Starts/Stop with P-9A breaker contacts
- P-9A ON - P-13 Off
- P-9A Off - P-13 On
Will continue to run with P-9B/P-41 running.
Where is dry pipe sprinklers typically used?
Areas subjected to freezing temperatures.
- Training Building
- RVR Area
- Track Alley
Melting of fusible sprinkler head releases air pressure allowing water valves to open – water flows through melted sprinkler heads only
How does an ionization detector function?
Small amount of Americium provides a radiation field between charged plates
Smoke entering between charged plates causes a change in voltage to occur which actuates an alarm
How does a Photo-electric Detector work?
- Use LED as light source
- Light detector at an angle to centerline of LED does not normally detect light
- Smoke entering detector reflects light to detector and actuates an alarm
How does an Ultraviolet Detector work?
- Optically view a specific area
- Sensitive to a specific wave length of light
- When the specific wave length of light is detected an alarm is actuated
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CCW39
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CCW Alarms8
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Containment Air Coolers40
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Containment Spray System31
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Electrical Distribution36
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125 V DC, 120 Volt Preferred AC and Instrument AC Power17
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Main Generator49
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Service Water34
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EDG75
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Station Power39
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Vessel & Internals30
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Station Power Alarms24
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Primary Coolant System47
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Primary Coolant System Alarms13
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Primary Coolant Pumps30
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Primary Coolant Pump Alarms14
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Chemical Volume and Control37
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CRD61
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Primary Vent System20
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Pressurizer Level Control43
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Containment Building50
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Safety Injection System50
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Safety Injection System Alarms16
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Shutdown Cooling13
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Main Steam System42
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Main Steam System Alarms6
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Main Steam System Tech Specs8
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SGWL38
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Main Condenser, Condensate and Feedwater56
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Main Condenser, Condensate and Feedwater Alarms22
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Main Condenser, Condensate and Feedwater Tech Specs3
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Extraction Steam and Heater Drains38
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Extraction Steam and HD Alarms4
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Auxiliary Feedwater System50
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Auxiliary Feedwater System Alarms7
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Auxiliary Feedwater System Tech Specs16
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Main Turbine Control and Supervisory45
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Main Turbine Control and Supervisory Alarms32
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Pressurizer Pressure Control23
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DC Power Supplies3
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Instrument and Service Air39
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CRHV57
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CRHV Tech Specs16
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Purge and Vent54
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Fire Protection System41
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Spent Fuel Pool34
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Rad Monitoring44
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Shield Cooling21
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Nuclear Instrumentation38
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RPS41
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RPS Trips11
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Thermal Margin Monitor50
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PPC12
