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EO 2 > EO 2 B1 Waste Gas > Flashcards

EO 2 B1 Waste Gas Flashcards

1
Q

ONE purpose of the Gaseous Radwaste System is to provide cover gas for the __ .

A. Detergent Waste Drain Tank
B. Concentrates Storage Tank
C. Clean Waste Receiver Tanks
D. Miscellaneous Waste Drain Tank

A

C

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2
Q

The purpose of the Cover Gas System is to ______ .

A. prevent H2 explosions.
B. prevent 02 corrosion.
C. provide Net Positive Suction Head to pumps.
D. provide dilution of gases.

A

B

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3
Q

One purpose of the Waste Gas System is to provide Cover Gas to which of the following?

A. The Reactor Coolant Drain Tank.
B. The Clean Waste Receiver Tanks.
C. The Detergent Waste Drain Tank.
D. The Miscellaneous Waste Drain Tank.

A

B

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4
Q

The Waste Gas System provides Cover Gas for

A. Boric Acid Evaporators.
B. Spent Resin Storage Tank.
C. Clean Waste Monitor Tanks.
D. Miscellaneous Waste Monitor Tank.

A

C

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5
Q

Which ONE of the following combinations of these listed gases would you expect to find present in a sample of a Waste Gas Decay Tank?

  1. Hydrogen
  2. Oxygen
  3. Nitrogen
  4. Helium
  5. Nitrous Oxide
  6. Carbon Monoxide

A. 1, 2, 3
B. 1, 2, 5
C. 3,4,6
D. 4,5,6

A

A

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6
Q

Which ONE of the following sources is the largest contributor to gases in the AERATED portions of the Waste Gas System?

A. Waste Gas Surge Tank
B. Reactor Coolant Drain Tank
C. Clean Waste Receiver Tanks
D. Miscellaneous Waste System Tank Vents

A

D

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7
Q

Venting of which of the following components will NOT cause Waste Gas Surge Tank pressure to rise?

A. Makeup Tank
B. Containment Vent Header
C. Reactor Coolant Drain Tank
D. Boric Acid Evaporator

A

D

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8
Q

Which ONE of the following is NOT a source of gas into the Waste Gas Decay Tank?

A. Primary Sample System
B. Containment Vent Header
C. Reactor Coolant Drain Tank
D. Concentrates Storage Tank Vent

A

D

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9
Q

The Waste Gas Surge Tank contains gases which are __ .

A. reused as cover gas
B. sent to the degasifier
C. used to purge Containment
D. sent to a Waste Gas Decay Tank

A

D

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10
Q

At 24” in the Waste Gas Surge Tank, the Waste Gas Surge Tank Transfer Pump will, if started MANUALLY, pump down any liquid accumulation to the

A. Detergent Waste Drain Tank
B. Reactor Coolant Drain Tank
C. Miscellaneous Waste Drain Tank
D. Waste Gas Decay Tank

A

B

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11
Q

The plant is in MODE 5. Reactor Coolant System fill is in progress.

  • Waste Gas Decay Tank 1 selected for SURGE TANK
  • Waste Gas Decay Tank 2 selected for NITROGEN
  • Waste Gas Compressor 1 selected for SURGE TANK and RUNNING
  • Waste Gas Compressor 2 selected for NITROGEN and RUNNING
  • Waste Gas Decay Tank 1 pressure 38 psig and RISING
  • Waste Gas Decay Tank 2 pressure 15 psig and CONSTANT
  • Waste Gas Surge Tank Pressure is 7.5 psig and SLOWLY LOWERING

Which ONE (1) of the following describes the reason for the above indications?

A. The cover gas header pressure is increasing due to filling the Clean Waste Receiver Tank.
B. The Miscellaneous Waste Monitor Tank is filling, pressurizing the nitrogen header due to Reactor Coolant System venting.
C. Venting the Reactor Coolant System to the containment vent header is in progress.
D. Water from the Reactor Coolant Drain Tank is filling the Waste Gas Surge Tank due to draining the Reactor Coolant System to the containment drain header.

A

C

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12
Q

The following plant conditions exist:

  • The plant is in MODE 3 with a heatup in progress.
  • Waste Gas Decay Tank 1 is selected for SURGE TANK.
  • Waste Gas Decay Tank 2 is selected for NITROGEN.
  • Wasta Gas 1 compressor is selected to OFF.
  • Waste Gas 2 compressor is selected to BOTH and is currently RUNNING.
  • Waste Gas Decay Tank 2 pressure is 5 psig and RISING.
  • Waste Gas Surge Tank pressure is 2.5 psig and CONSTANT.

Which ONE of the following describes the most likely reason for the above indications?

A. Gas is being displaced from the Clean Waste Receiver Tanks filling with letdown diverted due to plant heatup.
B. Venting the Reactor Coolant System to the Containment Vent Header is in progress.
C. Filling the Miscellaneous Waste Monitor Tank due to processing the large amount of radwasta generated for plant startup.
D. Water from the Reactor Coolant Drain Tank is filling the Waste Gas Surge Tank due to draining the Reactor Coolant System to the Containment Drain Header.

A

A

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13
Q

The plant is in MODE 5. Reactor Coolant System fill is in progress.

  • Waste Gas Decay Tank 1 selected for SURGE TANK
  • Waste Gas Decay Tank 2 selected for NITROGEN
  • Waste Gas Compressor 1 selected for SURGE TANK and RUNNING
  • Waste Gas Compressor 2 selected for NITROGEN and RUNNING
  • Waste Gas Decay Tank 1 pressure 38 psig and RISING
  • Waste Gas Decay Tank 2 pressure 15 psig and CONSTANT * Waste Gas Surge Tank Pressure is 7.5 psig and SLOWLY LOWERING

Which ONE (1) of the following describes the reason for the above indications?

A. The cover gas header pressure is increasing due to filling the Clean Waste Receiver Tank.
B. The Miscellaneous Waste Monitor Tank is filling, pressurizing the nitrogen header due to Reactor Coolant System venting.
C. Venting the Reactor Coolant System to the containment vent header is in progress.
D. Water from the Reactor Coolant Drain Tank is filling the Waste Gas Surge Tank due to draining the Reactor Coolant System to the containment drain header.

A

C

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14
Q

Which ONE of the following describes how valves WG 1819 and WG 1820 in the gaseous radioactive waste discharge flowpath to the station vent can be CLOSED?

A. Valve control switches in the Control Room ONLY
B. Valve control switches on the Radwasta Control Panel ONLY
C. Valve control switches on the Radwaste Control Panel and MANUAL trip of the Waste Gas Radiation Monitors from the Control Room
D. Valve control switches in the Control Room and MANUAL trip of the Wasta Gas Radiation Monitors at the Radwaste Control Panel

A

C

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15
Q

A waste gas decay tank release is in progress. It becomes necessary to stop the release.

Which ONE of the following actions will cause the release to be terminated from the Control Room?

A. Push the TRIP TEST button on RE 5405A, Radwaste Vent Radiation Element.
B. Enable the keyboard and trip RE 4598AA, Station Vent Radiation Monitors.
C. Push the TRIP TEST button on RE 5052A, Containment Purge Radiation Element.
D. Push the CHECK SOURCE button on RE 1822A, Waste Gas Radiation Element.

A

D

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16
Q

A high radiation alarm is received on RE1822A Waste Gas System Radiation Element during release of #1 Waste Gas Decay Tank.

Which ONE of the following automatic actions is true?

A. The WASTE GAS COMPRESSOR trips.
B. The inlet to #2 WASTE GAS DECAY TANK automatically opens.
C. The WASTE GAS DECAY TANK automatically goes on recirculation.
D. WG 1819AND WG 1820, WASTE GAS TO STATION VENT ISOLATIONS, go closed.

A

D

17
Q

The following plant conditions exist:

  • Waste Gas Compressor 2 is on BOTH.
  • Cover Gas Header pressure is 6 psig.
  • Waste Gas Surge Tank pressure is greater than 7.5 psig. Waste Gas Compressor 2 will align to pump down which system component?

A. Cover Gas Header
B. Waste Gas Surge Tank
C. Reactor Coolant Drain Tank
D. Waste Gas Decay Tank 1

A

B

18
Q

The following plant conditions exist:

  • # 1 Waste Gas Decay Tank is selected for “H2 SURGE TANK”
  • # 2 Waste Gas Decay Tank is selected to “OFF” * #3 Waste Gas Decay Tank is selected for “NITROGEN”
  • Waste Gas Compressor #1 is DNO’d
  • Waste Gas Compressor #2 is selected for “Both”
  • Waste Gas Surge Tank pressure is 8.1 psig

Which ONE of the following events would occur if the Cover Gas Header subsequently reaches 5 psig?

Waste Gas Compressor #2 will __ .

A. align itself to the Cover Gas Header exclusively.
B. continue to pump down the Surge Tank unless the Cover Gas Header reaches 7.0 psig, then will align to the Cover Gas Header exclusively.
C. stay aligned exclusively to the Waste Gas Surge Tank because pressure was greater than 7.0 psig.
D. continue to pump down the Surge Tank unless Cover Gas Header reaches 7.0 psig, then the compressor will align to both the Cover Gas Header and the Waste Gas Surge Tank.

A

D

19
Q

The following plant conditions exist:

  1. Cover Gas header pressure is a psig and RISING.
  2. BOTH Waste Gas compressors have started and are operating NORMALLY.

Which ONE of the following correctly describes the Waste Gas System response if Cover Gas pressure CONTINUES to RISE?

A. BOTH Waste Gas compressors will TRIP.
B. Alarm 7-2-C, Waste Gas Decay Tks TRBL, will alarm.
C. ONE Waste Gas compressor will TRIP.
D. Alarm 7-3-C, WST GAS System TRBL, will alarm.

A

D

20
Q

Plant conditions:

  • Releasing Waste Gas Decay Tank #1.
  • RE1822A, Waste Gas System Discharge Radiation Monitor, high alarm actuates.

Based on these conditions, identify the ONE statement below that describes (1) automatic interlocks actuated and (2) operator actions required.

A. (1) Main Station Exhaust Fan trips. (2) Notify Shift Manager.
B. (1) WG1819 & WG1820, Waste Gas to Station Vent Isolation Valves, close. (2) Stop Radwaste Area Exhaust Fan.
C. (1) WG1819 & WG1820, Waste Gas to Station Vent Isolation Valves, close. (2) Notify Shift Manager.
D. (1) Main Station Exhaust Fan trips. (2) Start CTRM Emergency Ventilation System.

A

C

21
Q

The following plant annunciator has just been received:

7-1-C, WASTE GAS SYSTEM OUT RAD HI

Which ONE of the following LOCAL operator actions is required for this condition?

A. Check the Radiation Monitoring Panel C5765 for a valid HIGH alarm.
B. Verify WG-1819, Waste Gas to Station Vent Isolation valve is CLOSED.
C. Check the Radiological Waste Control Panel 50 for a valid ALERT alarm.
D. Verify WG-68, Waste Gas Surge Tank Transfer Pump Discharge valve is CLOSED.

A

B

22
Q

Which ONE of the following parameters would result in annunciator 7-3-C, WST GAS SYSTEM TRBL alarming in the Control Room?

A. Waste gas surge tank level of 2.0 inches.
B. Waste gas surge tank pressure of 2.0 psig.
C. Waste gas surge tank oxygen concentration of 2.0%.
D. Waste gas surge tank hydrogen concentration of 2.0%.

A

C

23
Q

Which ONE of the following conditions will result in Annunciator 7-3-C, “WST GAS SYSTEM TRBL” alarming?

A. Waste Gas Surge Tank 02 concentration at 3.9%.
B. #2 Waste Gas Decay Tank 02 concentration at 1%.
C. Waste Gas Surge Tank H2 concentrations at 2.1 %.
D. #1 Waste Gas Decay Tank H2 concentration at 5.0%.

A

A

24
Q

At what pressure setpoint will the Wasta Gas Decay Tank high pressure alarm actuate?

A. 130 psig
B. 140 psig
C. 150 psig
D. 160 psig

A

B

25
Q

The following plant conditions exist:

  1. Cover Gas header pressure is 8 psig and RISING.
  2. BOTH Waste Gas compressors have started and are operating NORMALLY.

Which ONE of the following correctly describes the Waste Gas System response if Cover Gas pressure CONTINUES to RISE?

A. BOTH Waste Gas compressors will TRIP.
B. Alarm 7-2-C, Waste Gas Decay Tks TRBL, will alarm.
C. ONE Waste Gas compressor will TRIP.
D. Alarm 7-3-C, WST GAS System TRBL, will alarm.

A

D

26
Q

Match the alarm in the left column with its setpoint in the right column.

  1. Oxygen High
  2. Waste Gas Surge Tank Level High
  3. Waste Gas Absolute Filter D/P
  4. High Waste Gas Surge Tank Pressure High
  5. Cover Gas Pressure High

A. 35” of water
B. 0.5#
C. 24”
D. 1.7%
E. 12#
F. 9 #
G. 20”

A
  1. D.
  2. C.
  3. A.
  4. E.
  5. F.
27
Q

The Radwaste Panel operator calls and reports water hammer sounds in the Waste Gas Compressor discharge line. Which ONE of the following is the MOST LIKELY cause of this observation?

A. This is normal, the system is designed to operate with mild water hammer conditions.
B. Insufficient cooling by the compressor aftercooler.
C. Excessive cooling by the compressor aftercooler.
D. Compressor diaphragm failure.

A

B

28
Q

The following plant conditions exist:

  • The plant is in MODE 2 with a Reactor startup in progress.
  • Waste Gas Decay Tank 1 has been ISOLATED for four days in preparation for release.
  • Release pennit for Waste Gas Decay Tank has been initiated.
  • The Zone 3 operator reports Waste Decay Tank 2 pressure is 60 psig and Waste Gas Decay Tank 3 pressure is 10 psig.

Based on the above indications, which ONE of the following actions are warranted?

A. Initiate the release of Waste Gas Decay Tank 1 immediately.
B. Initiate the release of Waste Gas Decay Tank 1 only after ensuring 20 days have elapsed for the gases contained in the Decay Tank to decay.
C. Forward the release pennit to Chemistry for sampling of Waste Gas Decay Tank 1 if either Waste Gas Decay Tank 2 or Waste Gas Decay Tank 3 reaches 110 psig.
D. The release of Waste Gas Decay Tank 1 is required when another Waste Gas Decay Tank reaches 75 psig.

A

C

29
Q

Waste Gas Surge Tank O/H2 HI alann was just received, it was verified by chemistry that H2 is 4.7% and 02 is 2.8%. What is the required action?

A. Immediately purge with N2*
B. Immediately purge with H2.
C. Purge with N2 within 7 days.
D. Suspend addition to the Waste Gas Surge Tank.

A

A

30
Q

The Reactor Coolant System is being vented to the surge tank via the Containment vent header.

Chemistry Lab reports that the hydrogen concentration in the waste gas surge tank is 4.2% and the oxygen concentration is 0.3%.

Which ONE of the following indicates when the Reactor Coolant System vent to the surge tank should be STOPPED?

A. Immediately, since Hydrogen concentration exceeds 4%.
B. Oxygen concentration reaches 1%.
C. Immediately since Hydrogen concentration exceeds 2%.
D. Oxygen concentration reaches 2%, when hydrogen concentration exceeds 4%

A

D

31
Q

The Waste Gas System provides Cover Gas for

A. Boric Acid Evaporators.
B. Spent Resin Storage Tank.
C. Clean Waste Monitor Tanks.
D. Miscellaneous Waste Monitor Tank.

A

C

32
Q

A Waste Gas Decay Tank ___ _

A. should be isolated for 30 days prior to release
B. can not be released prior to 60 days of isolation
C. allows for the decay of N18 gas prior to release
D. is normally isolated for release when tank pressure is 100 psig

A

A

33
Q

Which of the following is the MAXIMUM allowable concentration of oxygen in the Gaseous Radwaste System when hydrogen concentration is 4.3% by volume?

A. 2%
B. 3%
C. 4%
D. 5%

A

A

34
Q

Plant conditions:

  • Reactor power is 100%, with ICS in full automatic.
  • Fuel pin failure has occurred.
  • RCS degassfication has resulted in higher than normal activity in the Waste Gas System vent header.
  • Waste Gas Decay Tank WGDT #1 has been isolated to support sampling in preparation tor releasing its contents to the environment.

Based on these conditions, identify the ONE statement below that describes a procedural method used to limit the amount of radioactivity discharged when this tank is released to the environment.

A. Shorten the WGDT #1 holdup time prior to release.
B. Introduce nitrogen dilution flow into the release effluent piping.
C. Filter the release through the HEPA and charcoal filters.
D. Increase the release rate to shorten the release duration

A

C

EO 2 (7 decks)

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