Containment Purge and Ventilation

Question 1

3.6.4 containment pressure

Answer 1

-0.1 to 1.0 psig

Question 2

3.6.5 containment temperature

Answer 2

The average inlet temperatures of the running RCFCs shall be <=120F

Question 3

If CRDM exhaust air temperature increases above ____ proceed to unit shutdown and reduce Tave to below ____.

Answer 3

165F
350F

Question 4

What is temperature limit on the CRDM coils?

Answer 4

392F

Question 5

With ____ or more CRDM exhaust fans inoperable: ____.

Answer 5

3
Shutdown and Tave<350F

Question 6

RX vessel head cooldown during Nat. circ.

Answer 6

-45F to 54F per hour
with fans
-1 F/hr no fans

Question 7

CNMT charcoal unit fans trip on ____ or _____.

Answer 7

Overcurrent
or
Deluge activated

Question 8

CRDM booster fans controlled from ___ and CRDM exhaust fans controlled from _____.

Answer 8

0PM02J

0PM02J and RSP

Question 9

U1 peak LOCA P
U2 peak LOCA P

Answer 9

42.8 psig
38.4 psig

Question 10

CNMT charcoal filter DP alarms
Prefilter
Hepa

Answer 10

1.0” H20
2.0” H20

Question 11

CRDM fans must be on whenever ____ or _____.

Answer 11

CRDM coils energized
or
RCS T >350F

Question 12

Power supplies of purge and exhaust fans

Answer 12

133x/134x

Question 13

Initiation signals for CVI

Answer 13

-Any SI
-Manual Phase A
-Manual CS
-Cnmt air area rad monitor

Question 14

AR011J controls train ____ dampers
AR012J controls train ____ dampers.

Answer 14

Train A
Train B

Question 15

Which dampers close on CVI?

Answer 15

TrainA
VQ001a, 002A, 004A, 005A and C
Train B
VQ001B, 002B, 003, 004B, 005B

Question 16

Sources of hydrogen post LOCA?

Answer 16

1. Radiolytic decomposition.
2. Zirc water reaction
3. Hydrogen release from RCS.
4. Plant material corrosion

Question 17

Normal purge supply fan starting interlocks

Answer 17

1VQ001y open
VQ001A and B open
Other fan disch shut

Question 18

Auto trips of purge supply fan (4)

Answer 18

Starting interlocks not met
Inlet air temp <40F
Smoke detected in air supply. w/purge CS in normal.
Overcurrent

Question 19

Purge exhaust fan starting interlocks

Answer 19

VQ002A/B open
Other fan disch shut
Either supply running

Question 20

Mini purge exhaust fan start interlocks

Answer 20

VQ005a/b/c all open

Question 21

Function of post-loca purge

Answer 21

Backup to hydrogen recombiners to purge the cnmt atmosphere of hydrogen. Maintain h2 <4% post loca

Question 22

Purge dampers must be _____ in modes _____.

Answer 22

De-energized closed
Modes 1-4

Question 23

When swapping RCFC from high to low speed there is _____.

Answer 23

20 second time delay whether SI present or not

Question 24

CNMT chilled water response to SI actuation

Answer 24

1. Cnmt isolation valves close on Phase A.
2. Running CW pump trips.
3. Chiller trips
4. SX112 & 114A/B close
5. SX147A/B open

Question 25

What happens to RCFC on SI?

Answer 25

1. High speed RCFC trip 2. After 20 sec TD, all fans start in slow. 3. RCFC SX in/out all open. SX016 rcfc gets esf open signal. SX027 out looks at breaker close of rcfc fans.

Question 26

What are the inputs to the RCFC accident mode red lights?

Answer 26

low speed breaker closed sx016 open sx027 open sx112a closed sx114a closed sx147A open

Question 27

RCFC high vibration

Answer 27

Alarms on MCB, seals in, must be reset on pm06j

Question 28

1sx016A/1sx027A must be ____ for manual 1a SX pump start. Same for 1B sx pump with B components.

Answer 28

open

Question 29

Reactor cavity cooling fans function:

Answer 29

1) Provide cooling air to: a) Excore instrument wells and cable junction boxes b) Space between the reactor vessel and the biological shield

Question 30

If containment pressure out of band, restore in ___ hours or be in Mode 3 ____ hours Mode 5 ____ hours.

Answer 30

1 hour 6 hours 36 hours

Question 31

If containment temperature >=120F, what actions?

Answer 31

c. Major Actions 1) Restore within 8 hours OR, 2) MODE 3 in 6 hours AND MODE 5 in 36 hours

Question 32

Are both the supply and exhaust mini-flow purge fans allowed to be operated simultaneously?

Answer 32

Only if they are opened under administrative controls (per SR 3.6.3.2)

Question 33

Explain how the RCFC units are cooled during normal operating conditions.

Answer 33

a. First Stage – cooled by Essential Service Water b. Second Stage – cooled by Cnmt Chilled Water which is cooled by Essential Service Water.

Question 34

Excore limitation ____F and alarm ____F.

Answer 34

135F 140F

Question 35

Why is slow speed required during accident for RCFCs?

Answer 35

Humid air will put more load on fans causing overload of fans and/or electrical busses

Question 36

WO pump will trip if ______ in both the _____ flowpaths.

Answer 36

...one or more containment isolation valves closed in both train A and B flowpaths.

Question 37

What are the interlocks to start a cavity fan, CRDM booster fan, or CRDM exhaust fan?

Answer 37

None