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
• Maintain acceptable smoke levels in CR
• Keep temperature in CR less than 97 deg F during accident
• Remove iodine and particulate
• Maintain rad levels during DBA less than 5 Rem
• Isolate CR during toxic gas release

Question 2

How does ESW interface with the CRAC?

Answer 2

• Cooling water for condensers

- Backup supply for cooling coils

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

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

Question 6

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

Answer 6

• Fail open with full flow to chillers

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

Question 7

Describe a design function of the Control Room Ventilation System?

Answer 7

• Maintains control room habitable for 30 days post accident while maintaining dose less than 5 rem TEDE to satisfy 10 CFR 50.36

Question 8

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 8

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

Question 9

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

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

Answer 9

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

Question 10

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

Answer 10

• 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 11

What does TS 3.7.10 B (CREV system) State?

Answer 11

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

Question 12

What does TS 3.7.10 F (CREV system) State?

Answer 12

• 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 13

What does TS 3.7.10 G (CREV system) State?

Answer 13

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 14

What does TS 3.7.11 D (CRAC system) State?

Answer 14

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

Question 15

What does TS 3.7.11 E (CRAC system) State?

Answer 15

If 2 CRAC trains inoperable
IMMEDIATELY:
- Enter LCO 3.0.3

Question 16

What is the makeup source to chilled water loops and humidifiers?

Answer 16

Demin water

Question 17

What is the normal position of the control room dampers

Answer 17

• 1/1A (CRAC outside supply): OPEN
• 2/2A (CREV outside supply): CLOSED
• 3 (CREV recirc): OPEN

Question 18

What is the position of the control room dampers for a toxic gas release

Answer 18

• 1/1A (CRAC outside supply): CLOSED
• 2/2A (CREV outside supply): CLOSED
• 3 (CREV recirc): CLOSED

Question 19

What is the position of the control room dampers for a cable vault fire

Answer 19

• 1/1A (CRAC outside supply): CLOSED
• 2/2A (CREV outside supply): PARITALLY OPEN
• 3 (CREV recirc): CLOSED

Question 20

What is the position of the control room dampers for a high rad alarm

Answer 20

• 1/1A (CRAC outside supply): CLOSED
• 2/2A (CREV outside supply): PARTIALLY OPEN
• 3 (CREV recirc): OPEN

Question 21

What is the position of the control room dampers for an SI in either unit

Answer 21

• 1/1A (CRAC outside supply): CLOSED
• 2/2A (CREV outside supply): PARTIALLY OPEN
• 3 (CREV recirc): OPEN

Question 22

For toxic gas, do the dampers align automatically or manually

Answer 22

Manual

Question 23

What are the rad monitor numbers that actuate CREV for each unit

Answer 23

• 7401 (U1)

- 8401 (U2)