Ctrl Room Ventilation

Question 1

How does ESW interface with the CRAC?

Answer 1

• Cooling water for condensers
• Backup supply for cooling coils

Question 2

Will the CRAC chiller trip off with a loss of ESW?

Answer 2

Yes

Question 3

When is the backup cooling capability lost with respect to ESW to the cooling coils?

Answer 3

Backup capability lost if ESW > 65°F

Question 4

What are the CR Pressurization Fan starts?

Answer 4

• SI in either Unit (Train Spec)
• CR High Rad (Unit Specific)
• CRCV Fire (CO2 or Halon actuation)
• Manual

Question 5

What the trips of the CRAC chiller package?

Answer 5

• High/Low Pressure
• High/Low Oil Pressure
• Low Temperature
• Overload
• Load Conservation (Fan is unaffected)

Question 6

How do the AHU Temp Control Valves (VRV-315/325) fail on a loss of air?

Answer 6

Fail open (full flow to chillers)

Question 7

When will Control Room vent intake damper no. 1 dampers ACRDA-1 / 1A be open?

Answer 7

During normal operation

Question 8

When will ACRDA-2 / 2A CREV outside dampers be part open?

Answer 8

• CRCV fire
• Hi Rad
• SI in either unit

Question 9

When will ACRDA-3,
C/R recirc damper be open?

Answer 9

• Norm operation
• Hi Rad
• SI either unit

Question 10

If there is a toxic gas leak, how are all 3 of the CR dampers aligned?

Answer 10

Manually closed

Question 11

What are the CR Vent Dampers positions during a SI, High Rad or Fire?

Answer 11

• 1/1A CRAC outside supply always close
• 2/2A CREV outside supply always part open
• 3 CREV C/R recirc is usually open - Closes on FIRE ONLY

Question 12

If U-1 gets a CRCV Fire signal and All U-1 CR Vent Sys Auto actions occur as expected
THEN
U-1 gets a CR High Rad signal,
Does U-1 CR vent Sys realign?

Answer 12

No, “First in Wins.”
The U-1 CR Vent System stays aligned for the U-1 CRCV Fire signal

Question 13

When will HV-ACR-DA-2A Clean Up Intake Damper go to part open?

Answer 13

If HV-ACR-DA-2 isn’t in part open after 45 sec since actuation

Question 14

Per TS 3.3.7 B (CREV system Actuation Instrumentation), what must be done if ONE or more required functions with 2 trains INOPERABLE, what must be done:

Answer 14

IMMEDIATELY:
- Place one CREV train in pressurization/cleanup mode
AND
- Enter applicable Conditions and Required Actions for 1 CREV train made Inoperable by Inoperable CREV actuation instrumentation
OR
- Place both CREV trains in pressurization/cleanup mode

Question 15

Per TS 3.7.10 B (CREV system), what must be done if 1 or more CREV trains Inoperable due to CRE Boundary in Modes 1-4

Answer 15

IMMEDIATELY:
Initiate action to implement mitigating actions

Question 16

Per TS 3.7.10 F (CREV system), If 2 CREV trains inoperable during movement of irradiated fuel assemblies OR 1 or more CREV trains inoperable due to an inoperable CRE boundary during movement of irradiated fuel assemblies

Answer 16

IMMEDIATELY:
Suspend movement of irradiated fuel assemblies

Question 17

Per TS 3.7.10 G (CREV system), if 2 CREV trains inoperable in Modes 1,2,3,4 for reason other than B (CRE Boundary) and C (filter), what must be done?

Answer 17

IMMEDIATELY Enter LCO 3.0.3

Question 18

Per TS 3.7.11 D (CRAC system), what must be done If 2 CRAC trains Inoperable during movement of irradiated fuel assemblies?

Answer 18

IMMEDIAELY Suspend movement of irradiated fuel assemblies

Question 19

Per TS 3.7.11 E (CRAC system), what must be done if there are 2 CRAC trains INOPERABLE?

Answer 19

IMMEDIATELY Enter LCO 3.0.3

Question 20

What is the design function of the Control Room Ventilation System?

Answer 20

Maintains the CR environment habitable during and following Design Basis Accident (DBA) events, consistent with 10CFR50.

Question 21

What makes up the control room envelop (CRE)?

Answer 21

Control room, heating, ventilation, AC equipment room, and PPC Room

Question 22

What is the quantitative limit for smoke per TS 3.7.10 (CREV System)?

Answer 22

There isn’t one. It is qualitative based on SM Discretion

Question 23

Is the CREV System required to be OPERABLE to ensure hazardous chemical limits are not exceeded?

Answer 23

NO! Analysis has determined it is not required to be operable

Question 24

During normal ops, CA to CPR inlet Volume damper VDC-207 is lost due to a small leak at the air valve. How is CPR operation affected? Assume the leak does not result in a loss of CA to any other component or system.

Answer 24

System can be operated at full flow as the damper fails open.