VENTILATION - REACTOR BUILDING

Question 1

What happens to AH-E-6A/B purge supply on AH-E-7 trip?

Answer 1

AH-E-6A/B purge supply trips to prevent pressurizing RB, and discharge dampers close.

Question 2

What conditions must be met to start AH-E-7A/B exhaust?

Answer 2

AH-D-82 (MU damper) must be unblanked, and the emergency purge damper must be blanked.

Question 3

What is the limit for purge valve (AH-V-1A/B/C/D) opening when not in CSD or RSD?

Answer 3

Purge valves are limited to 30° to ensure closure during LBLOCA per T.S. 3.6.9.

Question 4

What happens if purge valves are fully open at temperatures below 200°F?

Answer 4

AH-E-7 trip does not close the purge valves.

Question 5

Can RB purge be used for temperature or humidity control?

Answer 5

No, RB purge cannot be used for temperature or humidity control but can be used for pressure and radiation.

Question 6

When can RB purge be started before an outage?

Answer 6

RB purge can be started up to 24 hours before an outage.

Question 7

What is the restoration timeline if purge valves are INOP due to excessive leakage?

Answer 7

Restore in 48 hours or manually close both valves and restore operable in 72 hours, or maintain administratively closed.

Question 8

What is the restoration timeline if purge valves are INOP for reasons other than leakage?

Answer 8

Close the valves in 24 hours and maintain until operable. If neither valve is operable, restore one valve in 24 hours or go to HSD.

Question 9

What happens to RB purge if VBA is lost?

Answer 9

RB purge terminates due to RM-A-9 interlock.

Question 10

What triggers AH-E-101 to trip?

Answer 10

AH-E-101 trips on manual or auto actuation of kidney filter fire.

Question 11

What must be done before manually starting FS-P-5A/B?

Answer 11

AH-E-101 must be stopped first.

Question 12

How long does AH-E-101 take to circulate one RB volume?

Answer 12

AH-E-101 circulates one RB volume in 2 hours.

Question 13

Where is the FS-P-5A/B control panel located?

Answer 13

Outside the RB personnel hatch.

Question 14

What triggers FS-P-5A/B to auto-start?

Answer 14

FS-P-5A/B auto-starts when two temperature switches exceed 200°F.

Question 15

What must be done after FS-P-5A/B auto-starts due to temperature switch actuation?

Answer 15

They must be manually stopped after the temperature switch is reset.

Question 16

What is the LCO for one RR-P-1 being out of service?

Answer 16

72-hour LCO.

Question 17

What is the design basis for ECCS cooling?

Answer 17

3 AH-E-1s OR 2 BS-Ps OR 1 BS and 1 AH-E-1.

Question 18

What is required for AH-E-1 cooler operability?

Answer 18

Rx River must be circulating through the fan.

Question 19

What happens if one AH-E-1 fan is out of service?

Answer 19

No LCO is required.

Question 20

What happens if two AH-E-1 fans are out of service?

Answer 20

A 7-day LCO applies.

Question 21

What opens RR-V-10A/B?

Answer 21

RR-V-10A/B opens on pump start (52 breaker contacts).

Question 22

What signal opens RR-V-1A/B?

Answer 22

RR-V-1A/B gets an open signal on Block 1.

Question 23

What is the operability limit for RR-P-1 strainer differential pressure?

Answer 23

RR-P-1 is inoperable if strainer DP exceeds 6#.

Question 24

What is the function of RR-V-6?

Answer 24

RR-V-6 maintains 55# on coils for RB environment post-LOCA and is limited to 60% open.

Question 25

What is the LCO for RR-V-5/6 operability?

Answer 25

72-hour LCO.

Question 26

What are the temperature limits for normal RB cooling?

Answer 26

RB average air temperature above 320' must be <130°F, and below 320' must be <120°F.

Question 27

What is the action if RB cooling temperature limits are exceeded?

Answer 27

Restore within 8 hours or go to HSBY in 6 hours.

Question 28

What happens to AH-E-1C on an ES actuation?

Answer 28

AH-E-1C always trips on A or B ES and only restarts in slow speed if the respective train it is powered from has an ES actuation signal.

Question 29

What is required to use the REMOTE/SLOW 43 switch for AH-E-1s?

Answer 29

MCR control must be out of PTL, and the fan cannot be running in fast speed.

Question 30

What is the reactor pressure limit for criticality?

Answer 30

The reactor shall not be critical if RB pressure is >2# or <1# vacuum.

Question 31

Why are fans run in slow speed if RB pressure exceeds 2#?

Answer 31

To prevent motor overload.

Question 32

What is the heat sink for industrial coolers?

Answer 32

The atmosphere.

Question 33

What triggers spray pumps and heaters in industrial coolers?

Answer 33

They trip on low sump level at 20" (15" for 1B) and turn ON at 40°F (40-45°F for 1B).

Question 34

What happens to RB-V-2A during Block 1 ESAS?

Answer 34

RB-V-2A (cooling supply) closes, powered by 1C ESV.

Question 35

What happens to RB-V-7 during ESAS?

Answer 35

RB-V-7 closes, powered by 1B ES MCC.

Question 36

How does starting 2 RCPs during plant heatup affect RB pressure?

Answer 36

It increases RB pressure due to extra heat generated.

Question 37

What happens to AH-E-1C during ES actuation where the "B" train fails to actuate?

Answer 37

AH-E-1C trips on either train of ES and only restarts in slow speed if the train it is powered by receives an ES signal.

Question 38

What condition requires entry into a T.S. LCO?

Answer 38

AH-V-1A outside leakage limits.