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Consequences of removing both V-14 or V-68A/B air fans at the same time?
Contamination of chemistry personnel
During a fuel handling accident, what must be done with the aux building addition fuel handling area ventilation?
Must secure V-69 and V-70A/B
What must be done if the operating main exhaust fan V-6A/B trips during a waste gas batch?
- If the fan trips and the standby fan cannot be started, then you must immediately secure the release due to inadequate gas dilution
- Manually terminated by lowering the high alarm setpoint on RIA-1113 until high alarm actuates closing the waste gas release valves
Aux building addition fuel handling are exhausters V-70A/B?
- Standby fan starts at 0.5" water vacuum
- If V-69 trips then the standby fan trips unless only fan running
Exhaust outlet dampers PO-1839/1840
- PO-1839(1840) opens/closes automatically when V-14A(B) starts/stops
- Modulate to maintain preset pressure in the filter intake plenum
Containment purge system air room supply fan V-46
Trips on CHR/CHP
Why do we depressurize the containment building prior to Mode 4?
Because the purge exhaust valves are locked closed in Modes 1-4.
What ventilation should be running when the equipment hatch is open?
- V-67 radwaste addition supply fan
- V-68A/B radwaste addition exhaust fans
Main exhaust dampers PO-1816/1818
- Opens/closes on V-6A/B exhauster start/stop
- Interlocked to open both on increasing exhaust plenum pressure (2" water) when no exhaust fans are operating
- Interlocked so the non operating fan damper closes on the other fan starting
- -prevents reverse flow through the non operating fan
Effects of CHP/CHR on containment purge system
- V-46 trips
- Containment isolation dampers CV-1805/1806/1807/1808/1813/1814 close
- CWRT vent header isolation valves CV-1065 and CV-1064 close
Purpose of the charcoal filter in fuel handling area HVAC?
Limits boundary doses in the event of a fuel cask drop or other refueling accident (iodine)
ESS room damper (PO-1810/1817 east) (PO-1811/1812 west) controls
- Close/open/override to open
- Override to open
- -overrides the high rad alarm and opens the damper
- Amber light lit when switch on C-33 not in remote or when HS-1810A/1811A is in override to open
East and North corridor supply damper PO-1809
- Control switch on C-03
- Closes on RIA-1809 high rad
- -isolate potentially contaminated areas from other header and reduce spread of contamination
V-10 supply fan interlock
- Supply dampers PO-3010A-D open/close automatically when V-10 starts/stops
- Radwaste exhaust fan V-14A or V-14B selected for standby trips when supply fan V-10 trips (unless standby fan is only fan running)
- -trips due to lower air flow requirement to establish a negative pressure
- RIA-1809 trips V-10 on high rad(90% scale)
Why is at least 1 V-14A/B fan required to be operating?
- Ensures adequate sampling of rad monitors
- Prevents contamination of chemistry personnel using affected fume hoods
Potential consequence of placing T-64D in service?
May lead to water in the containment vent header which could prevent proper venting of containment.
Consequences of loss of main exhaust fan?
Reverse flow through filters and release of radioactivity.
Aux building addition supply fan V-67
- Supply damper D-1(PO-8006) opens/closes when V-67 starts/stops
- If V-67 trips the standby exhauster V-68A or B trips (unless it is the only 1 running)
- On RIA-5711 high rad (1X104 cpm), V-67 and standby V-68A/B trips
Consequences of operating the purge and ventilation systems under main exhaust plenum high pressure?
Reverse flow through filter banks and spread of contamination
What must be done upon loss of operating V-6A or V-6B?
- Terminate any gaseous release immediately
- Normally only 1 V-6A/B running at a time
Operation of fuel handling area exhaust damper switch HS-1894
- 2 position switch NORM/REFUEL
- -opens PO-1893A(D-977) and closes PO-1893B(D-978) to direct airflow through the filters VF-8 and VF-58
- -closes D-977 and opens D-978 to direct flow through VF-68 and VF-67 and charcoal filter VF-66
Radwaste area exhaust fans V-14A/B
- If V-10 trips, the standby fan trips if the other exhaust fan is running
- High rad on RIA-1809 trips the standby exhaust fan if the other exhauster is running
- If airflow drops to <25% or other exhaust fan trips, the standby fan will restart
LCO 3.7.12: Fuel handling area HVAC
- LCO 3.7.12: The fuel handling area ventilation system shall be operable with 1 exhaust fan aligned to the emergency filter bank and in operation
- -during movement of irradiated fuel assemblies in the FH building when irradiated fuel assemblies with <30 days of decay time are in the FH building
- -during movement of irradiated fuel assemblies in containment with <30 days decay time are in containment with the equipment hatch open
- -during movement of a fuel cask in or over the SFP when irradiated fuel assemblies with <90 days of decay are in the FH bluilding
- -during core alterations when irradiated fuel assemblies with <30 days of decay time are in containment with the equipment hatch open
- A. Fuel Handling Area Ventilation System not aligned or in operation.
- Fuel Handling Area Ventilation System inoperable.
- -Immediately suspend movement of fuel assemblies and
- -Suspend core alterations and
- -Suspend movement of a fuel cask over the SFP
What are the power supplies for the fuel handling area exhausters V-8A/B?
LCO 3.7.13 ESS room dampers
LCO 3.7.13 Two ESRV Damper trains shall be OPERABLE.
APP: MODES 1, 2, 3, and 4.
- A. One or more ESRV Damper trains inoperable.
- -A.1 Initiate action to isolate associated ESRV Damper train(s).-Immediately
Iodine removal fans (V-940A/B)
- 6,000 scfm
- 20 HP motor
- Control switches are in containment
- Start/Stop pushbuttons are in the D bus stairwell
Pressurizer shed cooling fans (V-61A/B/C)
- 5000 scfm
- 2 HP motor
- Required to be in service when the plant is heated
- -placed in service during the 250# checklist
LCO 3.3.10 Engineered safeguards room ventilation (ESRV) instrumentation
LCO 3.3.10 Two channels of ESRV Instrumentation shall be OPERABLE.
APP: MODES 1, 2, 3, and 4.
NOTE: Separate Condition entry is allowed for each channel.
- A. One or more channels inoperable.
- -A.1 Initiate action to isolate the associated ESRV System.-Immediately
ESS room fans V-27A/B/C/D controls
- -starts the fan
- -starts the fan at 85oF
- -starts the fan at 90oF
- Pull to lock
- Green/red lights
What are the east and west safeguards room cooling fans V-27A/B/C/D power supplies?
What is the design basis of the engineered safeguard room HVAC?
- Designed to limit the temperature in the ESS rooms to 135oF during a LOCA.
- Normally maintained <107oF.
Auxiliary building addition fuel handling area supply fan V-69
- Interlocked with V-70A/B exhausters
- -standby exhauster trips when the supply fan trips, unless the standby fan is the only fan running
- Fuel handling area fan and damper emergency trip HS-1893 on C-125
- -trips V-69 and both V-70A/B
- Trips V-69 and the standby V-70 on high rad RIA-5712 at 1X104cpm
Radwaste addition exhaust fans V-68A/B
- The associated damper opens on fan start
- 1 in close, 1 in standby
- If the fan suction pressure drops to 1.5" water vacuum with the supply fan off, the standby fan will start
When is a ESS room cooler considered operable?
- When service water is available and the associated fan is operable
- -V-27B EAST
- -V-27C WEST
- -V-27A/D are not techspec
Penetration and fan room HVAC system supply fan V-78 and exhaust fan V-79
- Fan auto starts at 90oF increasing and auto stops at 70oF
- Exhaust damper modulates to maintain a preset differential pressure across the filter unit
- Both fans trip on RIA-5710 at 4 mR/hr
Main exhaust fans V-6A/B
- Standby feature starts the idle fan if the operating fans breaker trips
- Trips on load shed, prevents the standby fan starting
- Amber light-standby
- Fan doesn't start until the damper is open
What are the temperature requirements for the safeguards rooms?
- Shall be >/= 50oF and </= 95oF
- If </= 42oF
- -components in the room are inoperable
- If <68oF
- -the air system low point drains shall be blown down more frequently due to elevated moisture
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