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Containment Purge (CP) Flashcards

1
Q

What is Containment Purge designed to do ?

A

Designed to purge Containment atmosphere to Plant Vent Stack & introduces filtered & treated makeup hair

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2
Q

What’re the two subsystems for Containment Purge ?

A

-Refueling Purge
-Power-Access Purge

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3
Q

What does Refueling Purge provide during plant shutdown & refueling ?

A

Provides:
-Ventilation for personnel comfort
-High Flowrate purge
-Designed to maintain airborne radioactivity below level that permits sustained personnel occupancy

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4
Q

What does Power-Access Purge provide ?

A

-Ventilation air to allow access for limited periods during power
-Low flow rate purge PRIOR to & DURING power-access period
-Designed to maintain airborne radioactivity below limit that permits short-term personnel occupancy
-Used to lower pressure in containment by periodically venting portion of containment air to Plant Vent

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5
Q

What does Refueling Purge subsystem consist of ?

A

-Containment Refueling Purge Normal AHU
-Two Containment Refueling Purge Normal Exhaust Fan
-Ductwork,Fan Discharge Dampers,Containment Isolation Valves

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6
Q

What does the Containment Refueling Purge Normal AHU provide ?

A

Provides filtered & conditioned air through damper & Containment Isolation Valves

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7
Q

Where do Exhaust Fans draw air from ? Where is it discharged to ?

A

Draws air from containment atmosphere, passes through Containment Isolation Valves, & exhausts discharges to plant vent

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8
Q

What does Containment Refueling Purge Normal AHU do ?

A

-Filters & conditions outside air to Containment during refueling for plant personnel

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9
Q

What does Containment Refueling Purge Normal AHU consist of?

A

-Oil Impingement Air Filter
-Cooling Coil
-Heat Element
-Fans

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10
Q

What’s the flow path through the Containment Refueling Purge Normal AHU ?

A

Two fans draw outside air, across Oil Impingement Filter, Cooling Coil, & Heating Element discharging to containment

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11
Q

What does Oil Impingement Air Filter do for the Containment Refueling Purge Normal AHU ?

A

-Activated Dust Mode to removes fine particulates from outside air during dust storms

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12
Q

What cooling water is sent through the cooling coil of Containment Refueling Purge Normal AHU ? How is discharge temperature maintained at 70F ?

A

-Normal Chilled water can be sent through or bypass cooling coil to maintain 70F

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13
Q

What position does the three way valve that send water through cooling coil fail to on loss of air ?

A

It fails full flow

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14
Q

When will the Heating Element for the Containment Refueling Purge Normal AHU turn on ? What will turn off the Heating Element ?

A

-If discharge temp is to low it’ll automatically turn on heater
-Heating Element will turn off if it sense low air flow through Containment Refueling Purge Normal AHU

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15
Q

When will Containment Refueling Purge Normal AHU discharge damper open ?

A

Damper will open when associated AHU fan turns on

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16
Q

What will cause dampers to fail close ?

A

-Loss of Instrument Air
-Control power to solenoid operated valve controlling air supply

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17
Q

How are the Containment Refueling Purge Normal AHU fans interlocked with Containment Isolation Valves ?

A

Containment Isolation Valves MUST be open for AHU fans to start

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18
Q

Where are the Containment Refueling Purge Normal AHU Fans operated from ?

A

AHU is operated from control room

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19
Q

What happens when Control Room Hand switch takes the Containment Refueling Purge Normal AHU to “Refueling Purge” position ?

A

As long as the associated Containment Isolation Valves are OPEN, the discharge dampers will open & both AHU fans will start

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20
Q

What powers the Containment Refueling Purge Normal AHU Heating Element ?

A

Non class 480Load Center(NG)

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21
Q

What power the Containment Refueling Purge Normal AHU Fans ?

A

480VAC MCC (NH)

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22
Q

What do the Containment Refueling Purge Exhaust Fans do ?

A

-Exhaust air from containment atmosphere through Plant Vent
-Maintains negative pressure inside containment

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23
Q

What’re the capacity of the Containment Refueling Purge Exhaust Fans ? When’re they running ?

A

-They’re each 50% capacity
-They’re running during operation of Refueling Purge Subsystem

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24
Q

When will the Containment Refueling Purge Normal AHU Exhaust discharge dampers open /close ?

A

They will open when exhaust fans start & will close when exhaust fans stop

25
When is Refueling Purge subsystem operated ?
In modes 5,6,& refueled
26
How is Refueling Purge subsystem operated when Equipment Hatch is open ?
-Containment Refueling Purge Normal AHU is shut off -Containment Refueling Purge Exhaust Fans are on -Exhaust Fans draw air from Equip. Hatch into containment and discharges it back out to atmosphere
27
How does Refueling Purge subsystem operated with only Personnel Hatches are open ?
-Containment Refueling Purge Normal AHU are on -Containment Refueling Exhaust Fans are on
28
What does Power-Access Purge subsystem consist of ?
-Power-Access Purge Normal AHU -Power-Access Purge Normal Exhaust AFU -Ductwork, discharge dampers,& containment isolation valves
29
What’re the two Power-Access subsystem modes ?
-Vent Mode -Power-Access Purge Mode
30
What is the Power-Access Purge Vent Mode ?
-Used to depressurize Containment Building prior to Power-Access Purge -Maintains Containment pressure within Tech. Spec. Limits
31
What is the Power-Access Purge Mode do ?
-Cleans up containment atmosphere to provide habitable environment for personnel access during power
32
What makes containment pressure gradually rise ?
Pneumatically operated equipment leaks air inside containment
33
What is the flow path of the Vent Mode ?
Containment pressure built up relives through Containment Isolation Valves, flow orifice,heater element,& Power-Access Purge Normal AFU, then discharged to plant vent
34
What is the motive force for the Vent Mode Containment Power-Access Purge subsystem ?
-Differential pressure between containment & outside atmosphere -Power-Access Normal AHU & Power-Access Normal AFU Fan are NOT operating in this mode
35
How does Power-Access Purge Mode subsystem work?
-Supply AHU supplies filtered conditioned air into containment -Exhaust AFU draws air from containment and discharges to Plant Vent
36
What does the Containment Power-Access Purge Normal AHU do ?
-Supplies Filtered & conditioned outside air to containment during power for safe access of personnel
37
What does Containment Power-Access Normal AHU consist of ?
-Suction damper -Moderate Efficiency Filter -High Efficiency Filter -Cooling Coil -Heat Element -Fan -Discharge chamber
38
What is discharge temperature supposed to be maintained at for the Containment Power-Access Purge Normal AHU ?
-Maintain 90F for discharge temperature
39
How many fans are in the Power-Access Normal AHU ?
One 100% capacity fan in
40
What is the Power-Access Purge AHU fan interlocked with ?
-Interlocked with Containment Isolation Valves -Containment Isolation Valves must be open for AHU fans to start
41
Where does Power-Access Purge Normal AHU fan draw air from ? Where does it discharge to ?
-Draws outside air across filters,Cooling Coils,& Heating Element -Discharges air into Containment
42
What happens when Control Room takes handswitch to “Access Purge”?
-As long as associated containment Isolation Valves are open, the suction & discharge dampers will open -AHU Fan will start
43
What does the Containment Power-Access Purge Normal Exhaust AFU do ?
-Filters & exhausts air from containment to Plant Vent Stack for habitable environment for personnel access at power
44
What does Containment Power-Access Purge Normal Exhaust AFU consist of ?
-Duct Heater -Moderate Efficiency Filter -HEPA Filter -Charcoal Filter -HEPA Filter -Fan -Discharge Damper
45
What is the Duct Heater used for on the Containment Power-Access Purge Normal Exhaust AFU ? When does it turn on/off?
-Maintains humidity of air <70%to prevent damage of Charcoal Filter -Automatically secured if low air flow through it is sensed
46
How is the discharge damper for the Containment Power-Access Purge Normal AFU operated when in Vent Mode?
Control room operated opens/closes to start/stop the venting of containment
47
How is discharge damper for Containment Power-Access Purge Exhaust AFU operated when in Purge Mode?
Operated with fan, when fans starts the discharge damper will open
48
What is the Tech Spec for pressure parameters inside containment ?
Pressure inside containment must be maintained greater than -0.3psig & less than 2.5psig
49
What mode is used to maintain pressure in containment between -0.3psig & 2.5psig during normal operation ?
Vent mode is used to periodically relieve pressure inside containment by aligned Power-Access Purge subsystem
50
When is Vent Mode used besides during normal operation ?
-Used to depressurize Containment Building prior to Refueling Purge & Power-Access due to containment pressure being above Operating pressure of fans
51
During purge mode what other system operated in conjunction with Power-Access Purge subsystem for safe containment access during power?
Containment Building HVAC systems Normal Cleanup (Pre-Access Normal AFU)
52
What is normal position of Containment Purge Containment Isolation Valves ?
Normally maintained closed & they’re opened when needed for desired subsystem
53
Where are the Refueling Purge Containment Isolation Valves powered from ?
Powered from 480VAC (PH)
54
Where are the Power-Access Containment Isolation Valves powered from ?
PK supplies power to solenoid controlling air supply
55
What BOP ESFAS will automatically close Containment Isolation Valves ?
-Containment Purge Isolation Actuation signal(CPIAS Initiated by high Rad detected by RU-37 & RU-38 -CIAS
56
Why is there a interlock for Containment Isolation Valves from being opened when Containment Building pressure less an 1in of Water Gauge ?
Ensures Power-Access Purge can’t be operated in purge mode when containment pressure is above operating pressure of the Fans
57
What happens to Fans & discharge dampers when Containment Isolation Valves go closed ?
Will cause discharge damper to close & fan to turn off
58
What Radiation Monitors continuously monitor Plant Vent Monitors ? What’re the Radiation Monitors used for ?
RU-143 Plant Vent Monitor Low RU-144 Plant Vent Monitor High -Used for Emergency Plan & Emergency Action Level

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