Containment Air Flashcards
The maximum Service Water temperature at which the Containment Air Coolers can perform their design function is: A. 80.0 B. 81.5 C. 85.0 D. 85.5
C. 85.0
If the Service Water flow paths to Containment Air Coolers VHX-1 and VHX-2 were isolated and drained for maintenance at the same time, which train(s) of Containment Cooling would be capable of performing their design function following a design basis accident? (Assume all other equipment is functional)
A. Both Containment Cooling Left Train and Containment Cooling Right Train would
be capable of responding to a design basis accident
B. Neither Containment Cooling Left Train or Containment Cooling Right Train
would be capable of responding to a design basis accident
C. Containment Cooling Left Train would, but Containment Cooling Right Train
would not be capable of responding to a design basis accident
D. Containment Cooling Left Train would not, but Containment Cooling Right Train
would be capable of responding to a design basis accident
C. Containment Cooling Left Train would, but Containment Cooling Right Train
would not be capable of responding to a design basis accident
Which one of the following describes the operation of the containment Iodine Removal
Fan units (V-940A, V-940B) and associated charcoal filters?
A. Automatically start on a Safety Injection Signal (SIS) to remove 1-131 generated
during a Loss of Coolant Accident (LOCA).
B. Manually started during a normal Plant shutdown to remove 1-131 for containment
habitability.
C. Manually started during a normal Plant startup to minimize potential 1-131 release tc
the environment.
D. Automatically start on a Containment High Pressure (CHP) to assist Containment
Spray System in removing 1-131 from containment.
B. Manually started during a normal Plant shutdown to remove 1-131 for containment
habitability.
a. Candidate correctly expresses a concern for 1-131; however, for the conditions
given (LOCA) iodine removal is via the TSP baskets; further, there is no automatic
start feature for this equipment.
b. CORRECT - These fans are manually operated (no auto start feature) and for
reducing iodine in the containment atmosphere prior to an outage.
c. These fans are not used for plant startup; candidate incorrectly believes a release
to the environment is the design function of the fans.
d. There is no automatic start feature for the fans.
Given the following:
A DBA LOCA has occurred
ALL ESF equipment has actuated as designed
Which ONE of the following describes the expected Containment Air Cooling Fan configuration?
A. “A” fans running, “B” fans tripped, and the Service Water discharge valves from
Coolers V-1, V-2 and V-3 CLOSED
B. “A” fans tripped, “B” fans running, and the Service Water inlet valves to Coolers
V-1, V-2, and V-3 OPEN
C. “A” fans tripped, “B” fans running, and the Service Water discharge valve from
Cooler V-4 OPEN
D. “A” fans running, “B” fans tripped, and the Service Water inlet valve to Cooler V-4
CLOSED
D. “A” fans running, “B” fans tripped, and the Service Water inlet valve to Cooler V-4
CLOSED
a. The fan response is correct, but the valves response is actually backward from
correct (see “d’).
b. Incorrect fan response, correct valve response.
c. Incorrect fan response, incorrect valve response.
d. CORRECT - Correct fan and valve response.
The plant has been operating at 100% reactor power for the last 128 days. A steam
line break outside of containment has caused main steam line pressures to drop to 45C
psia. The main steam isolation valves closed to isolate the break and S/G pressures
are on their way back to 900 psia but PZR level is off-scale low. If all systems
responded as designed and the operators have only monitored plant response and
have not taken any immediate actions, how did the Containment Air Coolers respond?
A. Containment Air Cooler alignment remains the same since break was outside of
Containment.
8. VHX-4 inlet valve CV-0869 Opens, all High Capacity SW Valves remain Open
(CV-0861, CV-0864, CV-0873, CV-0867), and all >B= fans trip
C. VHX-4 inlet valve CV-0869 Closes, all High Capacity SW Valves Open (CV-0861,
CV-0864, CV-0873, CV-0867), and all >A= fans trip
D. VHX-4 inlet valve CV-0869 Closes, all High Capacity SW Valves Open (CV-0861,
CV-0864, CV-0873, CV-0867), and all >B= fans trip
D. VHX-4 inlet valve CV-0869 Closes, all High Capacity SW Valves Open (CV-0861,
CV-0864, CV-0873, CV-0867), and all >B= fans trip
Following a large break Loss of Coolant Accident in which all Containment Spray is in
service, how many Containment Air Cooler Fans are required and why are they
required?
A. One Containment Air Cooler Fan is required to support Containment Spray operation for Containment Heat Removal
B. One Containment Air Cooler Fan is required to support Containment Spray operation to ensure adequate mixing of containment for iodine removal purposes
C. Two Containment Air Cooler Fans are required to support Containment Spray operation for Containment Heat Removal
D. Two Containment Air Cooler Fans are required to support Containment Spray operation to ensure adequate mixing of containment for iodine removal purposes
B. One Containment Air Cooler Fan is required to support Containment Spray operation to ensure adequate mixing of containment for iodine removal purposes
An ESOE inside of containment has occurred. Containment pressure is 6 psig. SIAS and CIS have initiated per design. While performing Standard Post Trip Actions in accordance with EOP 1.0, the Reactor Operator receives the following reflash alarm five minutes into the event:
EK-1150 “CONTAINMENT RECIRC FANS TRIP”
What action should the Operator take due to the receipt of this alarm?
A. An ‘A’ Containment Cooling Fan has tripped. Check to see which ‘A’ Fan has
tripped.
B. A ‘B’ Containment Cooling Fan has tripped. Check to see which ‘B’ Fan has
tripped.
C. This alarm is expected since SIAS trips all Containment Cooling Fans on an SIS
actuation.
D. This alarm is expected since CIAS trips all Containment Cooling Fans on a CIAS
actuation.
A. An ‘A’ Containment Cooling Fan has tripped. Check to see which ‘A’ Fan has
tripped.
A. Is correct. ‘B’ Fans are tripped; ‘A’ Fans continue to run. This alarm indicates
an accident fan (‘A’) has tripped.
B. Is incorrect. SIAS trips the ‘B’ fans. They would not be expected to cause a trip.
C. Is incorrect. The ‘A’ Fans are not tripped by SIAS.
D.ls incorrect. The ‘B’ Fans are tripped by the SIAS signal. The ‘A’ fans are not
tripped.
Following a Design Basis Accident (DBA) the ‘B’ Containment Air Cooler Fans are tripped by the DBA Sequencer.
Why are the ‘B’ fans not used for containment cooling following a DBA?
A. To limit the load carried by the Diesel Generators.
B. The ‘B’ Fans are not rated for the dense air following a DBA.
C. The ‘B’ Fans are not environmentally qualified for a DBA.
D. Only the ‘A’ Fans are protected by missile shields inside containment.
B. The ‘B’ Fans are not rated for the dense air following a DBA.
A. INCORRECT. The ‘B’ Fans are not loaded by either the DBA or SO Sequencer
following an SIS because they are not rated for operation in the denser air
environment inside containment following a DBA.
B. CORRECT. See item ‘A’.
C. INCORRECT. See item ‘A’.
D.INCORRECT. See item ‘A’.
The plant has experienced a Loss of Coolant Accident concurrent with a loss of Offsite
power. Both Diesel Generators have started and loaded their respective buses in accordance with the DBA Sequencer.
Which of the following describes the response of the Containment Air Cooling Fans (V-1A, 2A, 3A, 4A and V-1 B, 2B, 3B, 4B) and associated Containment Fan Coolers (VHX-1, VHX-2, VHX-3, VHX-4) following re-powering of Bus 1-C and Bus 1-D from the DBA Sequencer?
A. Containment Air Cooling Fan V-4A is tripped and its related cooler (VHX-4) Service Water inlet and HI Capacity outlet CVs are closed.
B. Fan Cooler VHX-4 Service Water Inlet CV (CV-0869) is open and its Hi Capacity Service Water outlet CV (CV-0867) is closed.
C. All four Containment Air Cooling ‘B’ Fans (V-1 B, 2B, 3B, 4B) are OFF and VHX-4 cooler Service Water inlet CV (CV-00869) is closed.
D. All four Containment Air Cooling ‘A’ Fans (V-1A, 2A, 3A, 4A) are running and all Fan Cooler Service Water inlet and Hi Capacity outlet valves are open.
C. All four Containment Air Cooling ‘B’ Fans (V-1 B, 2B, 3B, 4B) are OFF and VHX-4 cooler Service Water inlet CV (CV-00869) is closed.
A. INCORRECT. All ‘A’ fans are started by the DBA sequencer including V-4A. VHX-4 inlet CV is closed however its high capacity outlet CV is open.
B. INCORRECT. The inlet CV-0869 is closed however the outlet CV (CV-0867) is open. Both of these actions are initiated by the SIS-7 and SIS-8 relays.
C. CORRECT. The ‘B’ Fans are tripped by the SIS and relays SIS-7 and SIS-8 initiate closure of VHX-4 SW inlet CV-0869.
D. INCORRECT. The SW inlet CV for VHX-4 (CV-0869) is closed by relays SIS-7 and SIS-8.
The plant has experienced a Loss of Coolant Accident concurrent with a loss of Offsite
power. Both Diesel Generators have started and loaded their respective buses in
accordance with the DBA Sequencer.
Which of the following describes the response of the Containment Air Cooling Fans
(V-1A, 2A, 3A, 4A and V-1 B, 2B, 3B, 4B) and associated Containment Fan Coolers
(VHX-1, VHX-2, VHX-3, VHX-4) following re-powering of Bus 1-C and Bus 1-0 from the DBA Sequencer?
A. Containment Air Cooling Fan V-4A is tripped and its related cooler (VHX-4) Service Water inlet and HI Capacity outlet CVs are closed.
B. Fan Cooler VHX-4 Service Water Inlet CV (CV-0869) is open and its Hi Capacity Service Water outlet CV (CV-0867) is closed.
C. All four Containment Air Cooling ‘B’ Fans (V-1 B, 2B, 3B, 48) are OFF and VHX-4 cooler Service Water inlet CV (CV-0869) is closed.
D. All four Containment Air Cooling ‘A’ Fans (V-1A, 2A, 3A, 4A) are running and all Fan Cooler Service Water inlet and Hi Capacity outlet valves are open.
C. All four Containment Air Cooling ‘B’ Fans (V-1 B, 2B, 3B, 48) are OFF and VHX-4 cooler Service Water inlet CV (CV-0869) is closed.
A. INCORRECT. All ‘A’ fans are started by the DBA sequencer including V-4A. VHX-4 inlet CV is closed however its high capacity outlet CV is open.
B. INCORRECT. The inlet CV-0869 is closed however the outlet CV (CV-0867) is open. Both of these actions are initiated by the SIS-7 and SIS-8 relays.
C. CORRECT. The ‘B’ Fans are tripped by the SIS and relays SIS-7 and SIS-8 initiate closure of VHX-4 SW inlet CV-0869.
D. INCORRECT. The SW inlet CV forVHX-4 (CV-0869) is closed by relays SIS-7 and SIS-8.
Which of the following describes the configuration of the service water inlet and outlet control valves associated with the Containment Air Coolers (CACs) following an SIS and the bases for their configuration?
A. CAC VHX-4 service water inlet CV (CV-0869) is closed following an SIS to conserve service water flow.
B. CAC VHX-4 service water inlet CV (CV-0869) and outlet CV (CV-0867) are closed to conserve service water flow.
C. All CAC VHX service water inlet and outlet CVs are open to maximize heat removal from Containment.
D. All CAC VHX service water inlet and outlet CVs are open to ensure the integrity of the cooler tubes during a LOCA.
A. CAC VHX-4 service water inlet CV (CV-0869) is closed following an SIS to conserve service water flow.
A. CORRECT. The fourth CAC (VHX-4) is not taken credit for in maintaining containment temperature within limit (the service water inlet valve for VHX-4 is
closed by an SIS signal to conserve service water flow), but is used during normal operation along with the three CACs to maintain containment
temperature below the design limits.
B. INCORRECT. Only the inlet to VHX-4, CV-0869, is closed. Conservation of service water flow is correct.
C. INCORRECT. The inlet to VHX-4, CV-0869, is closed. See item A and B abOVE for the basis for closing CV-0869.
D. INCORRECT. The inlet to VHX-4, CV-0869, is closed.
During normal full power operations the breaker closed indication for Containment Air Cooler fan V-3A goes out. The bulb is verified to be good.
Which of the following Control Room indications could be used to diagnose that V-3A
is actually still in service, with a breaker indication problem only?
A. VHX-3A Dry Pan Level annunciator remains un-alarmed.
B. Containment Dome temperature trend remains constant.
C. V-3As’ companion fan V-38 breaker closed light remains lit.
D. Service Water flow to Containment remains unchanged.
B. Containment Dome temperature trend remains constant.
Which one of the following describes the operation of the containment Iodine Removal Fan units (V-940A, V-940B) and associated charcoal filters?
A. Automatically start on a Safety Injection Signal (SIS) to remove 1-131 generated during a Loss of Coolant Accident (LOCA).
B. Manually started during a normal Plant shutdown to remove 1-131 for containment habitability.
C. Manually started during a normal Plant startup to minimize potential 1-131 release to the environment.
D. Automatically start on a Containment High Pressure (CHP) to assist Containment
Spray System in removing 1-131 from containment.
B. Manually started during a normal Plant shutdown to remove 1-131 for containment habitability.
With the plant is operating at full power with no equipment out of service when the following valid alarm is received:
EK-1361, “CONTAINMENT HI PRESSURE”
Which one of the following describes the status of the Containment Air Cooler Fans?
A. All “A” fans ON, all “B” fans ON
B. All “A” fans ON, all “B” fans OFF
C. V-1A, V-2A, and V-3A ON, V-4A OFF. All “B” Fans OFF.
D. V-1A, V-2A, and V-3A OFF, V-4A ON. All “B” Fans OFF.
B. All “A” fans ON, all “B” fans OFF
Note the following alarm:
EK-1347, “CONTAINMENT AIR COOLERS SERV WATER LEAK”
Explain how the operator will diagnose which Containment Air Cooler is leaking.
Include in your answer which specific measured parameter inputs to this alarm, and
how that parameter is used in the diagnosis.
The following points should be included:
- A flow differential of 300 gpm between SW into and out of Containment is the input parameter. (0.5 points)
- To diagnose which cooler is leaking the operator closes and then reopens the SW inlet to each cooler one at a time in an attempt to clear the alarm. If the alarm clears, that is the leaking cooler. (0.5 points)
