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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
Q

When is Refueling Purge subsystem operated ?

A

In modes 5,6,& refueled

26
Q

How is Refueling Purge subsystem operated when Equipment Hatch is open ?

A

-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
Q

How does Refueling Purge subsystem operated with only Personnel Hatches are open ?

A

-Containment Refueling Purge Normal AHU are on
-Containment Refueling Exhaust Fans are on

28
Q

What does Power-Access Purge subsystem consist of ?

A

-Power-Access Purge Normal AHU
-Power-Access Purge Normal Exhaust AFU
-Ductwork, discharge dampers,& containment isolation valves

29
Q

What’re the two Power-Access subsystem modes ?

A

-Vent Mode
-Power-Access Purge Mode

30
Q

What is the Power-Access Purge Vent Mode ?

A

-Used to depressurize Containment Building prior to Power-Access Purge
-Maintains Containment pressure within Tech. Spec. Limits

31
Q

What is the Power-Access Purge Mode do ?

A

-Cleans up containment atmosphere to provide habitable environment for personnel access during power

32
Q

What makes containment pressure gradually rise ?

A

Pneumatically operated equipment leaks air inside containment

33
Q

What is the flow path of the Vent Mode ?

A

Containment pressure built up relives through Containment Isolation Valves, flow orifice,heater element,& Power-Access Purge Normal AFU, then discharged to plant vent

34
Q

What is the motive force for the Vent Mode Containment Power-Access Purge subsystem ?

A

-Differential pressure between containment & outside atmosphere
-Power-Access Normal AHU & Power-Access Normal AFU Fan are NOT operating in this mode

35
Q

How does Power-Access Purge Mode subsystem work?

A

-Supply AHU supplies filtered conditioned air into containment
-Exhaust AFU draws air from containment and discharges to Plant Vent

36
Q

What does the Containment Power-Access Purge Normal AHU do ?

A

-Supplies Filtered & conditioned outside air to containment during power for safe access of personnel

37
Q

What does Containment Power-Access Normal AHU consist of ?

A

-Suction damper
-Moderate Efficiency Filter
-High Efficiency Filter
-Cooling Coil
-Heat Element
-Fan
-Discharge chamber

38
Q

What is discharge temperature supposed to be maintained at for the Containment Power-Access Purge Normal AHU ?

A

-Maintain 90F for discharge temperature

39
Q

How many fans are in the Power-Access Normal AHU ?

A

One 100% capacity fan in

40
Q

What is the Power-Access Purge AHU fan interlocked with ?

A

-Interlocked with Containment Isolation Valves
-Containment Isolation Valves must be open for AHU fans to start

41
Q

Where does Power-Access Purge Normal AHU fan draw air from ? Where does it discharge to ?

A

-Draws outside air across filters,Cooling Coils,& Heating Element
-Discharges air into Containment

42
Q

What happens when Control Room takes handswitch to “Access Purge”?

A

-As long as associated containment Isolation Valves are open, the suction & discharge dampers will open
-AHU Fan will start

43
Q

What does the Containment Power-Access Purge Normal Exhaust AFU do ?

A

-Filters & exhausts air from containment to Plant Vent Stack for habitable environment for personnel access at power

44
Q

What does Containment Power-Access Purge Normal Exhaust AFU consist of ?

A

-Duct Heater
-Moderate Efficiency Filter
-HEPA Filter
-Charcoal Filter
-HEPA Filter
-Fan
-Discharge Damper

45
Q

What is the Duct Heater used for on the Containment Power-Access Purge Normal Exhaust AFU ? When does it turn on/off?

A

-Maintains humidity of air <70%to prevent damage of Charcoal Filter
-Automatically secured if low air flow through it is sensed

46
Q

How is the discharge damper for the Containment Power-Access Purge Normal AFU operated when in Vent Mode?

A

Control room operated opens/closes to start/stop the venting of containment

47
Q

How is discharge damper for Containment Power-Access Purge Exhaust AFU operated when in Purge Mode?

A

Operated with fan, when fans starts the discharge damper will open

48
Q

What is the Tech Spec for pressure parameters inside containment ?

A

Pressure inside containment must be maintained greater than -0.3psig & less than 2.5psig

49
Q

What mode is used to maintain pressure in containment between -0.3psig & 2.5psig during normal operation ?

A

Vent mode is used to periodically relieve pressure inside containment by aligned Power-Access Purge subsystem

50
Q

When is Vent Mode used besides during normal operation ?

A

-Used to depressurize Containment Building prior to Refueling Purge & Power-Access due to containment pressure being above Operating pressure of fans

51
Q

During purge mode what other system operated in conjunction with Power-Access Purge subsystem for safe containment access during power?

A

Containment Building HVAC systems Normal Cleanup (Pre-Access Normal AFU)

52
Q

What is normal position of Containment Purge Containment Isolation Valves ?

A

Normally maintained closed & they’re opened when needed for desired subsystem

53
Q

Where are the Refueling Purge Containment Isolation Valves powered from ?

A

Powered from 480VAC (PH)

54
Q

Where are the Power-Access Containment Isolation Valves powered from ?

A

PK supplies power to solenoid controlling air supply

55
Q

What BOP ESFAS will automatically close Containment Isolation Valves ?

A

-Containment Purge Isolation Actuation signal(CPIAS
Initiated by high Rad detected by RU-37 & RU-38
-CIAS

56
Q

Why is there a interlock for Containment Isolation Valves from being opened when Containment Building pressure less an 1in of Water Gauge ?

A

Ensures Power-Access Purge can’t be operated in purge mode when containment pressure is above operating pressure of the Fans

57
Q

What happens to Fans & discharge dampers when Containment Isolation Valves go closed ?

A

Will cause discharge damper to close & fan to turn off

58
Q

What Radiation Monitors continuously monitor Plant Vent Monitors ? What’re the Radiation Monitors used for ?

A

RU-143 Plant Vent Monitor Low
RU-144 Plant Vent Monitor High
-Used for Emergency Plan & Emergency Action Level

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