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Systems > Containment Purge and Ventilation > Flashcards

Containment Purge and Ventilation Flashcards

1
Q

3.6.4 containment pressure

A

-0.1 to 1.0 psig

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2
Q

3.6.5 containment temperature

A

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

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3
Q

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

A

165F
350F

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4
Q

What is temperature limit on the CRDM coils?

A

392F

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5
Q

With ____ or more CRDM exhaust fans inoperable: ____.

A

3
Shutdown and Tave<350F

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6
Q

RX vessel head cooldown during Nat. circ.

A

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

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7
Q

CNMT charcoal unit fans trip on ____ or _____.

A

Overcurrent
or
Deluge activated

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8
Q

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

A

0PM02J

0PM02J and RSP

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9
Q

U1 peak LOCA P
U2 peak LOCA P

A

42.8 psig
38.4 psig

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10
Q

CNMT charcoal filter DP alarms
Prefilter
Hepa

A

1.0” H20
2.0” H20

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11
Q

CRDM fans must be on whenever ____ or _____.

A

CRDM coils energized
or
RCS T >350F

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12
Q

Power supplies of purge and exhaust fans

A

133x/134x

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13
Q

Initiation signals for CVI

A

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

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14
Q

AR011J controls train ____ dampers
AR012J controls train ____ dampers.

A

Train A
Train B

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15
Q

Which dampers close on CVI?

A

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

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16
Q

Sources of hydrogen post LOCA?

A
  1. Radiolytic decomposition.
  2. Zirc water reaction
  3. Hydrogen release from RCS.
  4. Plant material corrosion
17
Q

Normal purge supply fan starting interlocks

A

1VQ001y open
VQ001A and B open
Other fan disch shut

18
Q

Auto trips of purge supply fan (4)

A

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

19
Q

Purge exhaust fan starting interlocks

A

VQ002A/B open
Other fan disch shut
Either supply running

20
Q

Mini purge exhaust fan start interlocks

A

VQ005a/b/c all open

21
Q

Function of post-loca purge

A

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

22
Q

Purge dampers must be _____ in modes _____.

A

De-energized closed
Modes 1-4

23
Q

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

A

20 second time delay whether SI present or not

24
Q

CNMT chilled water response to SI actuation

A
  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
25
Q

What happens to RCFC on SI?

A
  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.
26
Q

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

A

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

27
Q

RCFC high vibration

A

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

28
Q

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

A

open

29
Q

Reactor cavity cooling fans function:

A

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

30
Q

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

A

1 hour
6 hours
36 hours

31
Q

If containment temperature >=120F, what actions?

A

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

32
Q

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

A

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

33
Q

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

A

a. First Stage – cooled by Essential Service Water

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

34
Q

Excore limitation ____F and alarm ____F.

A

135F
140F

35
Q

Why is slow speed required during accident for RCFCs?

A

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

36
Q

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

A

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

37
Q

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

A

None

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