Ctrl Room Ventilation

Question 1

What is the purpose of the Ctrl Rm Ventilation?

Answer 1

• Maintain control room below 120°F during 4 hour coping period of Station Blackout
• Maintain normal temp less than 85°F
• Keep CR pressurized

Question 2

How does ESW interface with the CRAC?

Answer 2

• Cooling water for condensers

- Backup supply for cooling coils

Question 3

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

Answer 3

• Yes, it will

Question 4

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

Answer 4

• Backup capability lost if ESW > 65°F

Question 5

What are the CR Pressurization Fan starts?

Answer 5

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

Question 6

What the trips of the CRAC chiller package?

Answer 6

• Load Con**
• High Discharge Pressure
• Low Suction Pressure
• Low Temperature
• High Oil Pressure
• Low Oil Pressure
• Overload

Question 7

How do VRV-315/325 fail on a loss of air?

Answer 7

• Fail open with full flow to chillers

(ACRDA are motor operated and fail as is on loss of pwr)**

Question 8

When will ACRDA-1 / 1A be open?

Answer 8

• Only open during normal operation

Question 9

When will ACRDA-2 / 2A

CREV outside be part open?

Answer 9

• CRCV fire
• Hi Rad
• SI in either unit

Question 10

When will ACRDA-3 CREV inside (C/R recirc) be open?

Answer 10

• Norm operation
• Hi Rad
• SI either unit

Question 11

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

Answer 11

• Manually closed

Question 12

Describe a design function of the Control Room Ventilation System?

Answer 12

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

Question 13

What are the CR Vent Dampers positions in an emergency

Answer 13

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

Question 14

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 14

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

Question 15

When will HV-ACR-DA-2A Clean Up Intake Damper

HV-ACR-DA-2A go to part open?

Answer 15

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

Question 16

What does TS 3.3.7 B (CREV system Actuation Instrumentation) State?

Answer 16

• If One or more required functions with two trains inoperable
  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 17

What does TS 3.7.10 B (CREV system) State?

Answer 17

• If 1 or more CREV trains Inoperable due to CRE Boundary in Modes 1-4
  IMMEDIATELY:
• Initiate action to implement mitigating actions

Question 18

What does TS 3.7.10 F (CREV system) State?

Answer 18

• 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
  IMMEDIATELY:
• Suspend movement of irradiated fuel assemblies

Question 19

What does TS 3.7.10 G (CREV system) State?

Answer 19

If 2 CREV trains inoperable in Modes 1,2,3,4 for reason other than B (CRE Boundary) and C (filter)
IMMEDIATELY:
- Enter LCO 3.0.3

Question 20

What does TS 3.7.11 D (CRAC system) State?

Answer 20

• If 2 CRAC trains Inoperable during movement of irradiated fuel assemblies
  IMMEDIAELY:
• Suspend movement of irradiated fuel assemblies

Question 21

What does TS 3.7.11 E (CRAC system) State?

Answer 21

If 2 CRAC trains inoperable
IMMEDIATELY:
- Enter LCO 3.0.3