Nuclear Power Plant Operations Quiz
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What is the primary function of the air-operated isolation valves located inside the containment?

  • To provide flow indication and low flow alarms for proper chemistry control
  • To aid in the recovery of the steam generator water level
  • To protect personnel and equipment outside the containment from a high energy pipe break (correct)
  • To control the blowdown flow rate from each steam generator

    • What triggers the automatic closure of the containment isolation valves?

  • High pressure sensed in any room outside the containment
  • Steam generator blowdown flow exceeding 60 gpm
  • Low flow alarm for proper chemistry control
  • Autostart of a motor-driven auxiliary feedwater pump (correct)

    • What is the consequence of a loss-of-power or loss-of-air for the air-operated isolation valves?

  • They will fail closed (correct)
  • They will open partially to allow limited flow
  • They will open fully to allow maximum flow
  • They will remain in their current state

    • What is the purpose of the steam generator blowdown flow instruments (FT-1171, 2, and 3)?

    <p>To provide flow indication and low flow alarms for proper chemistry control</p> Signup and view all the answers

    What type of transmitters are used in the steam generator blowdown flow instruments (FT-1171, 2, and 3)?

    <p>Flexim Waveinjector transmitters</p> Signup and view all the answers

    What is the indicating range of the steam generator blowdown flow transmitters?

    <p>0 to 60 gpm</p> Signup and view all the answers

    What is the output signal of the steam generator blowdown flow transmitters?

    <p>4-20mA</p> Signup and view all the answers

    What is the configuration of the air-operated isolation valves on unit 1?

    <p>HV-7697A, HV-7698A, and HV-7699A are downstream of HV-7697B, HV-7698B, and HV-7699B</p> Signup and view all the answers

    What is the function of the pressure controller PC-1151?

    <p>To compare main steam header pressure and heat exchanger outlet pressure</p> Signup and view all the answers

    What happens to the valve when there is a loss-of-power or loss-of-air?

    <p>It fails closed</p> Signup and view all the answers

    What is the purpose of the inlet filter in the Steam Generator Blowdown system?

    <p>To remove suspended particles in the blowdown stream</p> Signup and view all the answers

    What is the function of the Demineralizer Bypass Valve (AOV-7604)?

    <p>To bypass the demineralizers</p> Signup and view all the answers

    How many bargraph LCD displays are on the FOXBORO 760 series controller?

    <p>3</p> Signup and view all the answers

    What does the high pressure signal from PT-1153 do?

    <p>Closes FCV-1152</p> Signup and view all the answers

    What is the purpose of the deviation alarm on the SGBD panel?

    <p>To alert the operator of a ±10% deviation from the control pressure</p> Signup and view all the answers

    What happens when the Demineralizer Isolation Valve (TCV-1150) is open?

    <p>Blowdown fluid is directed to the demineralizers</p> Signup and view all the answers

    How many demineralizers are there in the Steam Generator Blowdown system?

    <p>4</p> Signup and view all the answers

    What is the function of the SEL button on the keypad of the LCV-1003 controller?

    <p>To select the function for the up/down buttons and bargraph display</p> Signup and view all the answers

    What is the purpose of the steam generator shell drain pump?

    <p>To lower the steam generator water level when it is cooled down and depressurized</p> Signup and view all the answers

    What is the maximum temperature rise allowed for the cooling water in the blowdown heat exchanger?

    <p>20°F</p> Signup and view all the answers

    What is the nominal blowdown flow rate of the system during low range operation?

    <p>75 gpm total</p> Signup and view all the answers

    What is the purpose of the temperature control valve TCV-3939?

    <p>To control the service water from the heat exchanger</p> Signup and view all the answers

    What is the function of the Steam Generator Blowdown Heat Exchanger Outlet Flow Control Valve (FCV-1152)?

    <p>To automatically close to protect the system or prevent the release of radioactive fluid to the environment</p> Signup and view all the answers

    What is the purpose of the Pressure Control Valve (PCV-1151)?

    <p>To maintain a constant pressure differential between the steam header pressure and the heat exchanger outlet</p> Signup and view all the answers

    What is the normal mode of operation for the blowdown heat exchanger?

    <p>High range operation</p> Signup and view all the answers

    What is the purpose of the steam generator blowdown flow control valves (HCV-1171, 2, and 3)?

    <p>To control the blowdown flow rate from each steam generator</p> Signup and view all the answers

    What is the capacity of the steam generator shell drain pump?

    <p>45 gpm</p> Signup and view all the answers

    What is the purpose of the temperature instrument TT-1150?

    <p>To provide indication on the SGBD panel, as well as high temperature alarms</p> Signup and view all the answers

    What is the purpose of the Steam Generator Blowdown Outlet Filter?

    <p>To screen the demineralizer train effluent and eliminate the possibility of recycling or discharging resin particles.</p> Signup and view all the answers

    What happens when the demineralizer train is bypassed and the blowdown is being processed?

    <p>The purification outlet radiation monitor indicates a radioactive breakthrough across the demineralizers.</p> Signup and view all the answers

    What is the function of the Steam Generator Blowdown Surge Tank?

    <p>To provide a system surge capacity and ensure a sufficient net positive suction head (NPSH) to the discharge pumps.</p> Signup and view all the answers

    What is the purpose of the level transmitter (LT-1158) in the Steam Generator Blowdown Surge Tank?

    <p>To maintain a fixed fluid level (50%) in the surge tank by modulating the pump discharge flow via LCV-1158.</p> Signup and view all the answers

    What is the function of the Steam Generator Blowdown Discharge Pumps?

    <p>To provide for recycle, discharge, and batch processing operations.</p> Signup and view all the answers

    What happens when the Steam Generator Blowdown Surge Tank level falls below 10%?

    <p>The discharge pumps are shut off.</p> Signup and view all the answers

    What is the function of the Discharge Radiation Monitor (RE-23B)?

    <p>To monitor the activity level of the fluid leaving the SGBD.</p> Signup and view all the answers

    What happens when the Discharge Radiation Monitor (RE-23B) detects a high activity signal?

    <p>RCV-23B closes, preventing the discharge of high activity fluid to the environment.</p> Signup and view all the answers

    What is the normal path for the blowdown fluid?

    <p>To the environment (river) via the service water dilution line.</p> Signup and view all the answers

    What is the function of the Steam Generator Blowdown Surge Tank Level Control Valve (LCV-1158)?

    <p>To maintain a fixed fluid level (50%) in the surge tank by modulating the pump discharge flow.</p> Signup and view all the answers

    What is the purpose of the R23B Bypass Switch?

    <p>To render the low dilution flow trip of RCV23B non-functional</p> Signup and view all the answers

    What is the consequence of a loss-of-power or loss-of-air for the RCV023B valve?

    <p>The valve will fail closed</p> Signup and view all the answers

    What is the minimum flow rate required for the service water dilution flow when the SW Low Dilution Flow Trip is defeated?

    <p>12,500 gpm</p> Signup and view all the answers

    What is the purpose of the FT-1160 instrument?

    <p>To monitor the steam generator blowdown discharge flow</p> Signup and view all the answers

    What happens when the SGBD system is shut down and the sample system condensate return unit continues to pump water?

    <p>The SGBD surge tank will overflow</p> Signup and view all the answers

    What is the function of the Steam Generator Blowdown Discharge Pumps?

    <p>To pump water from the SGBD system to the environment</p> Signup and view all the answers

    What is the purpose of the three-position handswitch for the Steam Generator Blowdown Discharge Pumps?

    <p>To control the Steam Generator Blowdown Discharge Pumps</p> Signup and view all the answers

    What happens to the sample system condensate return unit when the SGBD system is tagged out?

    <p>The unit will back up and overflow to the floor of the 121 ft piping penetration room</p> Signup and view all the answers

    Study Notes

    High Energy Pipe Break Protection

    • Two series isolation valves (7697A/B, 7698A/B, 7699A/B) are located inside the containment on each line from the steam generator to protect personnel and equipment outside the containment from a high energy pipe break of the blowdown system.
    • These valves automatically close when high pressure (0.28-0.33 psig) is sensed in any room outside the containment where the blowdown piping is located.
    • The valves will fail closed on a loss-of-power or loss-of-air.

    Containment Isolation Valves (HV-7614A, B, and C)

    • A containment isolation valve is located immediately outside the containment in each blowdown line.
    • Each valve will automatically close upon an autostart of a motor-driven auxiliary feedwater (MDAFW) pump to aid in the recovery of the steam generator water level.
    • These valves are controlled from the main control board (MCB) and fail closed on a loss-of-power or loss-of-air.

    Steam Generator Blowdown Flow (FT-1171, 2, and 3)

    • These instruments indicate the blowdown flow rate from each steam generator.
    • Flow indication and low flow alarms are provided on the SGBD panel.
    • The instruments, in conjunction with the associated flow controller (HIK-1171, 2, or 3), adjust the blowdown flow rate from each steam generator.

    Steam Generator Blowdown Flow Control Valves (HCV-1171, 2, and 3)

    • The air-operated blowdown flow control valves are modulated by their associated controllers (HIK-1171, 2, and 3) on the SGBD panel.
    • The valves control the blowdown flow rate from each steam generator and fail closed on a loss-of-power or loss-of-air.

    Steam Generator Shell Drain Pump

    • The steam generator shell drain pump is used to lower the steam generator water level when it is cooled down < 200°F and depressurized.
    • The pump has a 45 gpm capacity at 175' of head and receives power from motor control center MCC D.

    Steam Generator Blowdown Heat Exchanger

    • The heat exchanger sub-cools the blowdown fluid from steam generator exit conditions to 130°F, 10°F below the recommended maximum operating temperature for the demineralizer resin.
    • The blowdown stream is cooled by service water to maintain a constant blowdown outlet temperature of approximately 130°F.

    Steam Generator Blowdown Heat Exchanger Outlet Flow Control Valve (FCV-1152)

    • This air-operated isolation valve automatically closes to protect the system or prevent the release of radioactive fluid to the environment.
    • The valve will close on purification inlet filter high pressure, high heat exchanger outlet temperature, high activity, high surge tank level, and high flow.

    Pressure Control Valve (PCV-1151)

    • PCV-1151 maintains a constant pressure differential between the steam header pressure and the heat exchanger outlet.
    • The backpressure on the hot blowdown fluid prevents excessive flashing upstream of the heat exchanger.
    • The valve is controlled by pressure controller PC-1151 and fails closed on a loss-of-power or loss-of-air.

    Steam Generator Blowdown Total Flow (FT-1152)

    • FT-1152 indicates the total blowdown flow rate through the SGBD processing system.
    • A high flow signal closes FCV-1152.

    Steam Generator Blowdown Inlet Filter

    • The inlet filter is designed to remove suspended particles in the blowdown stream to prevent plugging the resin beds.
    • The filter is placed in service only during SGBD operation using the demineralizers.
    • A bypass arrangement is provided for periods when demineralizer processing is not desired.

    Demineralizer Bypass Valve (AOV-7604)

    • When open, the air-operated demineralizer bypass valve will bypass the demineralizers.
    • The valve is manually controlled from the SGBD panel and fails closed on a loss-of-power or loss-of-air.

    Demineralizer Isolation Valve (TCV-1150)

    • The air-operated demineralizer isolation control valve directs blowdown fluid to the demineralizers.
    • The valve may only be open in the low range mode of operation and fails closed on a loss-of-power or loss-of-air.

    Steam Generator Blowdown Demineralizers

    • There are four demineralizers.
    • The demineralizers are not presently used or maintained.

    Steam Generator Blowdown Outlet Filter

    • The outlet filter screens the demineralizer train effluent, eliminating the possibility of recycling or discharging resin particles.

    Purification Outlet Radiation Monitor (RE-23A)

    • The purification outlet radiation monitor determines the activity level of the fluid entering the surge tank.
    • A high activity signal closes FCV-1152, which stops the blowdown.

    Steam Generator Blowdown Surge Tank

    • The surge tank provides a system surge capacity and ensures a sufficient net positive suction head (NPSH) to the discharge pumps.
    • The surge tank has a capacity of 1420 gallons.
    • A high level (90%) closes FCV-1152, while a low level signal (10%) shuts off the discharge pumps.

    Steam Generator Blowdown Discharge Pumps

    • Two canned motor pumps provide for recycle, discharge, and batch processing operations.
    • Each pump has a design capacity of 75 gpm at a 350-ft head.
    • The pumps are powered from 600V motor control center (MCC) C.

    Steam Generator Blowdown Surge Tank Level Control Valve (LCV-1158)

    • LCV-1158 is controlled from the surge tank level controller (LC-1158) located on the SGBD panel.
    • The controller maintains 50% level in the tank by modulating LCV-1158.

    Discharge Radiation Monitor (RE-23B)

    • RE-23B monitors the activity level of the fluid leaving the SGBD.
    • A high activity signal from this instrument closes RCV-23B, which prevents the discharge of high activity fluid to the environment.

    Discharge Paths

    • The blowdown fluid may either be discharged to the environment or to the main condenser.
    • The normal path will be to the environment (river) via the service water dilution line.
    • The blowdown will be recycled to the main condenser if the fluid does not meet the discharge limits or if a water conservation program is in effect.

    Sample System Return

    • The secondary sample system condensate return unit collects water from the steam system sample station and pumps the water collected to the SGBD system.
    • When the SGBD system is shut down, the sample system condensate return unit continues to pump the water collected to the SGBD system.

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    Test your knowledge of nuclear power plant operations, including isolation valves, containment systems, and steam generator flow instruments.

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