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systems test 4 > Condensate > Flashcards

Condensate Flashcards

condensate

1
Q

STATE the function of the Condensate (CO) System

A
  • Transports 22,500 gpm of condensate (during normal ops) from the hotwells to the FW pump suction.
  • Preheats the CO in a series of steam heaters to improve efficiency.
  • Provides inventory control for the secondary system - makeup for leakage/discharge to ocean for excess.
  • Supplies CO to various auxiliary loads for sealing and cooling, such as:
  • Gland Seal water to the CO pumps, the FW pumps, the Heater Drain (HD) pumps, hotwell isolation valves and CO pump suction valves.
  • Exhaust Hood Spray.
  • Tempering Water to the HD pumps.
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2
Q

STATE the functions of the following component:

Hotwells.

A
  • Provide a collection volume for condensate from the condenser.
  • Provide 3 minutes worth of inventory full load.
  • Provide NPSH to the CO pumps.
  • Provide a means of keeping debris out of the CO pumps.
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3
Q

STATE the functions of the following component:

CO Pumps

A

Supply 70% of the required water to the FW pumps.

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4
Q

STATE the functions of the following component:

Steam Packing Exhauster.

A

• Collects and condenses sealing steam provided to the Main And Feed Pump Turbine shafts (really just a mini-condenser).
– Shaft packing glands prevent condenser air in-leakage.
– Prevents sealing steam leaks into the Turbine Building.

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5
Q

STATE the functions of the following component:

Low Pressure Feedwater (FW) Heaters.

A

Heaters utilize the thermal energy from extraction steam and cascading heater drains to heat the condensate in order to increase plant efficiency.

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6
Q

STATE the functions of the following component:

CO Storage Tank (CST).

A

• Provides a storage capacity for the CO system and an emergency reserve for the Emergency Feedwater (EFW) system.

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7
Q

STATE the functions of the following component:

CO Transfer Pump

A

• Circulates the CST temperature through a heat exchanger heated by Auxiliary Steam and returns it to the CST.

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8
Q

STATE the functions of the following component:

CST Heat Exchanger.

A

• Maintains the CST temperature at ~67-69ºF (and prevents freezing) by use of Auxiliary Steam.

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9
Q

STATE the functions of the following component:

CO Cleaning System Filters.

A
  • Filter system used to help cleanup corrosion products from the system for startup.
  • Used to supply the startup feed pump during plant startup.
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10
Q

STATE the functions of the following component:

CO Pump Recirc Control Valve

A

A recirculating control valve located at the discharge of each pump protects the pump from overheating due to reduced flow in the event a valve in the discharge line is closed.

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11
Q

STATE the functions of the following component:

CO System Recirc Control Valve.

A

The minimum flow requirements for the steam packing exhauster and the CO pumps is maintained by the modulation of the condensate recirculation flow control valve (FV-4042).

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12
Q

STATE the functions of the following component:

Tempering Water

A
  • The condensate supplied to the heater drain pumps is used for gland seals, as well as for cooling the pumps’ suction headers.
  • This cooling water for the heater drain pumps suction headers is called tempering water.
  • Tempering water prevents the heater drain water from flashing to steam during transient operations.
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13
Q

DRAW the MAJOR flow paths of CO

A 
CO pump suction.
CO pump short term recirc.
CO cleanup (supply and return).
CO pump long term recirc.
21/22 FW heaters (inlet/outlet and bypass valves).
FW heaters 23 - 25 (block diagram).
HD pump discharge.
Normal hotwell makeup/discharge path.
Demineralized Water Storage Tank (DWST) to CST gravity fill.
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14
Q

STATE the normal values of the following:
Flow rates from the CO Pumps to the FW pumps
Capacity Rating of each hotwell
Normal Hotwell Level
Individual CO Pump Flow and Pressure
Flow rate of one Cleaning System Train

A

Flow rates from the CO Pumps to the FW pumps: 22,500gpm.
Capacity Rating of each hotwell: 22k gallons
Normal Hotwell Level: 0 inches.
Individual CO Pump Flow and Pressure: 11,500gpm/ 460#.
Flow rate of one Cleaning System Train: 3000gpm.

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15
Q

DESCRIBE the operation of the following

Hotwell Level Control System.

A

Makeup valve will auto close if CST level reaches 233K

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16
Q

DESCRIBE the operation of the following

Steam Packing Exhauster

A
  • Only a portion of the condensate flow passes through the tube side of the steam packing exhauster, as the remaining flow passing through a variable orifice in the waterbox.
  • The variable orifice maintains the minimum condensate flow required by the exhauster to condense the steam from the steam packing glands.
  • The blower at the steam packing exhauster produces a slight negative pressure at the steam sealing glands, drawing steam and air into the shell side of the exhauster.
  • The steam is condensed and drained back to the main condenser, while the air is removed by the blower to atmosphere.
  • Non-condensables at the discharge of the exhauster can be monitored for radiation.
17
Q

DESCRIBE the operation of the following

CO Cleaning System.

A

PCV maintains 60# to inlet of filters

18
Q

STATE the power supplies for the CO Pumps

A
  • A+C powered from Bus 3

* B powered from Bus 4

19
Q

STATE the minimum flow requirements for CO Pump Operation

A 
6,000 gpm
must have SCCW minimum flow:
–	>26 gpm to left air cooler.
–	>26 gpm to right air cooler.
–	>5 gpm to bearing oil cooler
20
Q

STATE which FW Heaters have motor operated isolation and bypass valves and DESCRIBE the interlock associated with them.

A

21/22 FW HTR
• Bypass - Auto open on high level.
• Inlet/outlet - auto close on high level (+10 inches) on associated heater string.
• Bypass Interlock - will not shut unless all 6 inlet and outlet valves are open

21
Q

STATE the functions of the following component:

Main Condenser

A
  • Provides a heat sink for the main and feed pump turbines.
  • Maintains a vacuum which lowers the turbine’s exhaust back-pressure and promotes maximum turbine efficiency.
  • Collection point for various system vent and drains (ASC, SB, HD, FW, CO gland seal).
  • De-aerates the condensed water.
  • Provides a discharge volume for the steam dumps.
22
Q

STATE the functions of the following component:

Mechanical Vacuum Pumps.

A
  • Creates the initial vacuum in the condenser when starting up.
  • De-aerates the Condenser.
23
Q

STATE the functions of the following component:

Mechanical Vacuum Pump spray nozzle

A
  • Provides seal water through a spray nozzle to the 1st stage of the vacuum pump to pre-condense hot gases/steam.
  • This spray flow reduces the volume of gas the Mechanical Vacuum Pumps must compress, cools the pump, and improves the pump’s efficiency.
24
Q

STATE the functions of the following component:

Condenser Vacuum breaker

A
  • Provides for a means of rapidly breaking Condenser vacuum.

* Prevents over-pressurizing the condenser shell during fill.

25
Q

STATE normal operating condenser vacuum in units of “HgV”.

A

~28.5” HgV

26
Q

DEFINE the terms “Hogging” and “Holding” as they apply to Vacuum Pump Operations

A
  • During startup, the pumps establish the initial condenser vacuum. This level of operation is referred to as hogging and utilizes all three pumps.
  • After the unit is on line, the steam condensing process creates the vacuum and the pumps are used to remove noncondensible gases. This mode of operation is called holding and utilizes two pumps with the third in standby.
  • Hogging mode: With all three pumps in operation, the interstage balanced check valve at the second stage inlet bypasses the second stage.
  • Holding mode: Only two pumps needed, the interstage balanced check valve at the second stage inlet no longer bypasses the second stage
27
Q

LIST the interfacing systems that perform the following functions:

- Condense the Main Turbine Exhaust Steam.
- Cools the Mechanical Vacuum Pump Gland Seal Water.
- Monitors the Discharge of the Vacuum Pumps.
- Supplies the Vacuum Pump Moisture Separator with Makeup Water.
A
  • Condense the Main Turbine Exhaust Steam.
  • Circ Water
    • Cools the Mechanical Vacuum Pump Gland Seal Water.
  • Circ Water
    • Monitors the Discharge of the Vacuum Pumps.
  • Radiation monitor
    • Supplies the Vacuum Pump Moisture Separator with Makeup Water.
  • DM
28
Q

DESCRIBE two methods of determining Condenser Air Leakage

A

• Automatic measuring method (preferred).
• Manual measuring method.
1. Isolate the suction of the
other running pump.
2. Line up the rotometer.
3. Close the discharge check
valve to force air through the rotometer.
• In-leakage surveillance using helium.
• Task consists of applying helium to suspected leak areas.
• Technique is very sensitive and must be applied in very short puffs via an application wand. This ensures that helium background concentration in the area being checked does not rise excessively.
• Start at bottom of component.
• Saran wrap

systems test 4 (4 decks)

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