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Condensate
Condensate & Condensate Filtration
| Question | Answer |
|---|---|
| What is the purpose of the Condensate System? | To reclaim the steam used to drive the main turbines by condensing the exhaust of the low pressure turbines and also de-aerates and filters the exhaust for delivery to the feedwater system. |
| What is the condensate designated as? | It is designated as the primary water supply to the reactor. |
| What is the purpose of the Main Condenser? | Receives steam from the low pressure turbines during normal operation or the turbine bypass valves during startup, shutdown, or turbine trip. |
| What is the purpose of the Condensate Spray Pump? | To spray water from the low pressure section of the condenser to the high pressure section of the condenser to prevent a large vacuum differential between condenser sections. |
| What is the purpose of the Vacuum Breakers? | To break vacuum in the low, intermediate, and high pressure condenser sections during shutdown. |
| What is the power supply to the Vacuum Breakers? | PB 131B |
| What is the purpose of the Condensate Pumps? | To provide motive force to move condensate from the Main Condenser to the Feedwater Booster Pumps. |
| How many Condensate Pumps are there and what are their names? | 3. Condensate Pump 11,12, & 13 |
| What are the power supplies to the Condensate Pumps? | Condensate Pump 11 (PB 11), 12 (PB 101), 13 (PB 12) |
| What is the purpose of the level control valves? | To maintain the proper level for condenser differential seals to prevent air in-leakage. |
| What is the purpose of the Condensate Demineralizers? | To remove corrosion products and minimize condenser tube corrosion through ion exchange. |
| What is the purpose of the Condensate to Condenser Minimum Flow Control Valves (50-24)? | To recirculate condensate to the main condenser to prevent overheating of the condensate pumps during start-up. |
| What is the power supply of the Condensate Spray Pump? | PB 13B |
| What is the power supply of the Condensate Demineralizer Control Panel? | Transformer 142A |
| Where is the Hotwell located? | At the bottom of the condenser. |
| Where is condensate in the condenser collected? | In the Hotwell. |
| What provides condenser overpressure protection on low vacuum? | Turbine Trips, Bypass Valve Trips, & MSIV closure. |
| What vacuum pressure is the condenser designed to maintain? | 28.5" Hg vacuum or 1.5" Hg Absolute |
| At what pressure do the rupture disks on the turbine hoods relieve? | 5 lbs |
| Where does the Low Pressure drains of the Condensate Spray Pump lead to? | Condensate Spray Pump Sump |
| When does the Condensate Spray Pump Trip? | Lo-Lo level in its' Sump |
| When do the Turbine Bypass Valves Open? | When the Turbine Control Valves open less than a position corresponding to 15% turbine load |
| When does the Bypass Steam Cooling Spray Flow Control Valve (50-22) open? | When the Turbine Bypass Valve opens and the Turbine Control Valve is open less than a position corresponding to 15% turbine load |
| How does the Bypass Steam Cooling Spray Flow Control Valve (50-22) fail upon loss of air? | Fails closed |
| How do the Vacuum Breakers break vacuum? | Motor-operated valves for each section of the condenser opens the turbine building |
| How are the Level Control Valves operated & how are they controlled? | Air-operated. Controlled by the control room |
| How is the Hotwell level raised? | by opening the 8" and 12" makeup valves |
| At what level are the 8" & 12" makeup valves fully open? | 8" makeup valve fully opens at 62" and 12" makeup valve fully opens at 60" |
| How is the Hotwell level lowered? | By opening the Spill Valve |
| At what level is the Spill Valve fully open? | 68" |
| How are the spill valve and makeup valves controlled? | Auto or manual control |
| How do the spill valve and makeup valves fail? | Fail closed |
| How are the spill valve and makeup valves operated? | Air-operated |
| What % capacity is each Condensate Pump designed to be? | 50% |
| When do the Condensate Pumps Auto-start? | 120 lbs |
| How are the Condensate Pumps cooled? | RBCLC |
| What is the purpose of the Condensate Filtration System (i.e. Pre-filters)? | To reduce particulate, Iron, & Copper loading of Condensate Demineralizers |
| How many Condensate Demineralizers are there? | 6 |
| What must be done to the Condensate Demineralizers prior to being placed in service? | Must be vented and filled with water to prevent air from entering the reactor |
| What is the purpose of Flow Control Valve 50-20? | Provide fixed flow to heat exchangers that cool: offgas Recombiner condensers, SFAE intercondenser & Aftercondenser, Also pre-heats condensate to improve efficiency |
| How does the Condensate to Condenser Minimum Flow Control Valves (50-24) & Flow Control Valve 50-20 fail upon loss of power? | Fail open |
| What is the power supply for the Condensate to Condenser Minimum Flow Control Valves (50-24) & Flow Control Valve 50-20? | I&C Bus 130 |
| How does Flow Control Valve 50-20 fail upon loss of air? | Fails as-is |
| How does Flow Control Valve 50-20 raise flow through the HXs? | Throttles Closed |
| How does the Condensate to Condenser Minimum Flow Control Valves (50-24) raise flow through the pumps? | Throttles Open |
| How does the Condensate to Condenser Minimum Flow Control Valves (50-24) fail upon loss of air? | Fails Open |
| Where is Oxygen injected? | The suction of the Condensate Pumps |
| Why is Oxygen injected? | To create a Oxide layer |
| How many Pre-Filters are in the Condensate System? | 4 |
| What % condensate flow do the 2 Pre-Filter bypass lines allow? | 25% & 100% |
Created by:
ckelle27
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