System Purposes Flashcards
1
Q
Electrical systems
A
Generate and transmit electric power into the PJM network
2
Q
Main Steam
A
- Deliver steam from the Nuclear Boiler to the Main Turbine at rated flow, temperature, and pressure from turbine warm-up to valves wide open
- Provide steam to the Steam Jet Air Ejectors, Steam Seal Evaporator, Reactor Feed Pump Turbines, Off Gas Recombiner Preheater, and Condenser Hotwell Steam Spargers
- Bypass steam to the condensers during startup and when reactor steam production is greater than required by the turbine
3
Q
Main Turbine
A
Convert thermal energy from Main Steam to rotational mechanical energy for the Main Generator
4
Q
Turbine Supervisory Instruments
A
Contains the operating and indicating devices necessary to operate the turbine
5
Q
Extraction Steam
A
Supplies steam from the HP turbine, cross around piping, and LP turbines to the six stages of Feedwater heaters
6
Q
Seal Steam
A
Provide a continuous supply of clean (low level radioactive) steam to the Main Turbine and Reactor Feed Pump Turbine shaft seals, and the stem packing for the Main Steam Valves, Main Turbine Control Valves, Combined Intermediate Valves, and Reactor Feed Pump Turbine stop and control valves
7
Q
Main Turbine Lube Oil
A
- Provide clean, pressurized oil to the Main Turbine thrust bearing, Main Turbine and Main Generator journal bearings, lift pump suction, Hydrogen Seal Oil, and Reactor Feed Pump Turbine lube oil systems.
- Provide high pressure oil for the turbine over speed ring and turbine low speed switch.
8
Q
Lube Oil Storage and Treatment
A
Store clean oil for makeup, and dirty oil for purification or disposal.
9
Q
Oily Waste
A
Receives oily waste from various sources via a piping manifold and sump and transfers the waste to an underground tank
10
Q
Condensate
A
- Supply clean oxygenated water to the Feedwater system at required pressure, flow, and temperature to assure NPSHA for the Reactor Feed Pumps for maintaining RPV level during startup, operation, and hot shutdown.
- Supply clean water to the suction of the Control Rod Drive Pump
- Automatically maintain Main Condenser level
11
Q
Condenser
A
- Condense and deaerate the drains from the Feedwater Heaters and other components in the heat cycle
- Serve as a heat sink for the turbine bypass steam, steam line drains, heat cycle relief discharge, Feedwater heater dumps, Reactor Feed Pump seal drains, and other misc. flows.
- Retain for a minimum of two minutes the condensate formed during full load operation, to allow radioactive decay before returning the Condensate to the cycle.
- Maintain the Condensate purity by removing corrosion products, suspended, and dissolved solids, and fission, and activation products.
- Provide a passive hold-up and radioactive decay volume following an accident for any leakage through the Main Steam Isolation Valves as part of the MSIV leakage alternate drain pathway
12
Q
Hotwell Makeup and Reject
A
Maintains Hotwell level during steady state and transient conditions
13
Q
Condensate Filter
A
Provide Mechanical filtration of Condensate to maintain a high degree of purity in the Feedwater and Nuclear Boiler systems
14
Q
Deep Bed Demineralizers
A
Provide ionic filtration of Condensate to maintain a high degree of purity in the Feedwater and Nuclear Boiler system
15
Q
Condensate Storage and Transfer
A
- Supply water to fill the Reactor Well, the Dryer/Separator Storage Pool, and Spent Fuel pool
- Supply water to the Cask Storage Pit of one unit during refueling operations, and provide storage for this water when refueling is completed.
- Supply Condensate for various processes in the Radwate Systems and makeup for the plant systems including the Hotwells
- Supply a minimum of 135,000 gallons of Condensate to the HPCI pump, Reactor Core Isolation Cooling pump, and Core Spray pumps
- Alternate supply of water to the CRD system during plant shutdown
- Provide capability to Demineralize the water in the Refueling Water Storage Tank by pumping it through the Condensate Demineralizers
- Provide storage for condensate rejected from the Drain Cooler Inlet Header and Radwaste Systems
- Provide the capability to drain the Reactor Well through the Condensate Demineralizers and back to the RWST
16
Q
Feedwater
A
- Return fluid from the Condensate system Demineralizers to the Reactor pressure Vessel at the requires flow, pressure, and temperature
- Maintain the selected or required water level in the RPV during steady state and transient conditions
- Permit continued operations of the plant at rated power without reactor trip upon loss of one of the Reactor Feed pumps or one of the Feedwater heater strings
- Permit continued operations of the plant at reduced power without reactor trip upon loss of one of the Condensate pumps
- Allow for the controlled addition of Zinc and other compounds into the reactor vessel through GEZIP system injection
17
Q
Reactor Feed Pump Seal Injection
A
Supplies condensate water at high pressure to seal and cool Reactor Feed Pump shaft seals
18
Q
Control Rod Drive
A
- Provide rapid control rod insertion in the core when reactor scram is required
- Provides control rod positioning in the core
- Provides adequate cooling water for the CRDs
- Provides water for ‘A’ RWCU pump motor purge
19
Q
Circulating Water
A
- Provide a continuos supply of water to the Low Pressure, Intermediate Pressure, and High Pressure Condensers in series to removed heat from the steam cycle
- Collect the heated water from the LP, IP, and HP Condensers and pump it to the Cooling tower for ultimate heat removal
- Remove non-condensate gases from the Waterboxes via Waterboxes Scvenging pumps to ensure efficient Condenser operation
- Inject Sulfuric Acid on and intermittent basis to control pH and to prevent scaling in the Condenser tubes
- Inject inhibitors to control, at a minimum, mild steel, and copper corrosion and heat exchanger scaling.
20
Q
Cooling Tower
A
- Transfer the heat from the plant Service Water System and from the condenser to the atmosphere
- Provide a reservoir of water for the Circulating Water and Service Water systems
- Provides a primary source of water to the Fire Protection system
- Provides an alternate heat sink for the Residual Heat Removal Service Water system
- Provides a limited alternate source of makeup water via gravity feed to the Spray Pond
21
Q
Cooling Tower Makeup Water
A
Provide makeup cooling water to the Cooling Tower basins, spray pond, and raw water clarifiers.
22
Q
Service Water
A
- Removed heat from heat exchangers in the turbine, reactor, and Radwaste enclosures, and to transfer this heat to the cooling towers
- Operate during normal plant operation and plant shut down with offsite power available
23
Q
Spray Pond
A
To supply an adequate source of cooling water to the Residual Heat Removal Service Water and Emergency Service Water Systems for 30 days without requiring makeup during the following scenarios
- Simultaneous safe shutdown and cool down of both units, and maintenance of them in a safe condition
- Dissipation of the heat for an accident on one unit, the concurrent safe shutdown and cool down of the other unit, and maintenance of both units in a safe shutdown condition
- To withstand the most severe natural phenomena or site related event without impairing it’s function
- With sufficient capacity and redundancy so that a single active failure cannot impair the capability of the system to perform it’s safety related functions
24
Q
Emergency Service Water
A
- Supply cooling water to both essential and nonessential equipment during a Loss Of Offsite Power condition or Loss of Coolant Accident
- Withstand the most severe natural phenomenon or site related event without impairing it’s function
- Prevent inadvertent leakage of radioactivity to the environment
- Include the capability of operating one loop from the Remote Shutdown Panel
25
Residual Heat Removal
Provide cooling water flow for removing heat from the Residual Heat Removal heat exchangers during the following conditions
1. Normal operations
2. Normal and/or Emergency shutdown
3. Hot Standby/ Refueling
26
Core Spray
1. Provides a redundant means for removal of decay heat from the core following a postulated LOCA to meet the requirements of 10CFR60.46
2. Provides a means for flooding the Reactor Vessel to remove decay heat from the core to support alternate shutdown cooling
27
Safeguard Piping Fill
Designed to maintain the pump discharge lines in a filled condition and is a safety related backup to the Condensate Storage and Transfer System
28
Feedwater Fill
Part of the Safeguard Piping Fill system which is manually initiated and provided a water seal in both Feedwater lines
29
High Pressure Coolant Injection
1. Provide coolant to rector vessel following a small break LOCA to meet 10CFR50.46 requirements until reactor vessel pressure is below the pressure at which CSS operation of LPCI of the RHR system operation maintains core cooling
2. Provide sufficient coolant to the reactor vessel to prevent the actuation of the Automatic Depressurization System (ADS) and maintain reactor level above the top of the reactor core in the event of a small pipe break with a break size of one-inch diameter or less
30
Reactor Core Isolation Cooling
1. Provides sufficient coolant to the reactor vessel to prevent excessive fuel cladding temperatures during a reactor isolation event accompanied by the loss of coolant flow from the Feedwater system
2. Provides sufficient coolant inventory in the reactor vessel to allow for a complete plant shutdown in the event of a loss of normal Feedwater until the reactor is depressurized to a level where the Shutdown Cooling Mode of the Residual Heat Removal (RHR) System can be placed in operation
3. Provides coolant inventory and temperature control when the reactor vessel is isolated and maintained in hot standby condition
31
Automatic Depressurization System
Actuated five Nuclear Boiler System Main Steam Relief Valves which depressurized the reactor pressure vessel so that injection flow from the Residual Heat Removal System Low Pressure Coolant Injection and/or Core Spray system can occur in adequate time to cool the core and limit fuel temperatures
32
Emergency Diesel Generators
1. Start automatically and supply AC power to Class 1E buses during a loss of offsite power (LOOP); or a LOOP coincident with a loss of coolant accident (LOCA) in one unit, for safe shutdown and cool down of the LOCA unit and safe shutdown of the other unit
2. Withstand the most severe natural phenomenon or site related event without impairing its function
3. Have sufficient capacity and redundancy so that a single active failure cannot impair the capability of the system to perform its safety related functions
4. Have sufficient fuel oil capacity for all diesel generator load conditions during continuous operation, and to allow for subsequent refueling
5. Have sufficient cooling water capacity to cool diesel engine cylinder jackets, combustion air, and lubricating oil sufficiently to permit continuous operation during full load and to maintain warm jacket coolant temperatures during standby status to promote starting
33
Core Spray
1. Provides a redundant means for removal of decay heat from the core following a postulated LOCA to meet the requirements of 10CFR60.46
2. Provides a means for flooding the Reactor Vessel to remove decay heat from the core to support alternate shutdown cooling
34
Safeguard Piping Fill
Designed to maintain the pump discharge lines in a filled condition and is a safety related backup to the Condensate Storage and Transfer System
35
Feedwater Fill
Part of the Safeguard Piping Fill system which is manually initiated and provided a water seal in both Feedwater lines
36
High Pressure Coolant Injection
1. Provide coolant to rector vessel following a small break LOCA to meet 10CFR50.46 requirements until reactor vessel pressure is below the pressure at which CSS operation of LPCI of the RHR system operation maintains core cooling
2. Provide sufficient coolant to the reactor vessel to prevent the actuation of the Automatic Depressurization System (ADS) and maintain reactor level above the top of the reactor core in the event of a small pipe break with a break size of one-inch diameter or less
37
Reactor Core Isolation Cooling
1. Provides sufficient coolant to the reactor vessel to prevent excessive fuel cladding temperatures during a reactor isolation event accompanied by the loss of coolant flow from the Feedwater system
2. Provides sufficient coolant inventory in the reactor vessel to allow for a complete plant shutdown in the event of a loss of normal Feedwater until the reactor is depressurized to a level where the Shutdown Cooling Mode of the Residual Heat Removal (RHR) System can be placed in operation
3. Provides coolant inventory and temperature control when the reactor vessel is isolated and maintained in hot standby condition
38
Automatic Depressurization System
Actuated five Nuclear Boiler System Main Steam Relief Valves which depressurized the reactor pressure vessel so that injection flow from the Residual Heat Removal System Low Pressure Coolant Injection and/or Core Spray system can occur in adequate time to cool the core and limit fuel temperatures
39
Emergency Diesel Generators
1. Start automatically and supply AC power to Class 1E buses during a loss of offsite power (LOOP); or a LOOP coincident with a loss of coolant accident (LOCA) in one unit, for safe shutdown and cool down of the LOCA unit and safe shutdown of the other unit
2. Withstand the most severe natural phenomenon or site related event without impairing its function
3. Have sufficient capacity and redundancy so that a single active failure cannot impair the capability of the system to perform its safety related functions
4. Have sufficient fuel oil capacity for all diesel generator load conditions during continuous operation, and to allow for subsequent refueling
5. Have sufficient cooling water capacity to cool diesel engine cylinder jackets, combustion air, and lubricating oil sufficiently to permit continuous operation during full load and to maintain warm jacket coolant temperatures during standby status to promote starting
