Term
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Definition
Supplies the station with reliable, clean, oil-free compressed air for use in the following systems:
1.Service Air
2. Control Air
3. Penitration Cooling Backup Supply |
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Term
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Definition
Supplies the Control Air System even in the event of a single failure. Must supply air from redundant sources so that the loss of an air header or compressor does not result in shutdown of the plant or compramise of its operation.
Penitration lines must have at least 1 containment isolation valve that is either automatic or locked closed. System includes ability to test containment penetration line leakage. |
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Term
Name the 5 Loops of operation for the SACs
through the use of the Inlet Guide Vane Valve and the Blow Off Valve. |
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Definition
Inlet Max Load Loop: Max guide vane opening to limit FLA
Inlet System Pressure Loop: Modulates guide vane valve to maintain system pressure.
Inlet Surge Control Loop: Modulates guide vane valve to prevent low flow surge.
Blow Off System Pressure Loop: Blow Off Valve Modulates to relieve system pressure.
Max Discharge Pressure Loop: In case of a sudden increase in System pressure, a rapid discharge from the Blow Off Valve or unloading of the compressor.
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Term
What mode of operation is used for the Salem SAC Systems?
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Definition
| Only the Auto-Offline operating Mode consisting of 5 Control Loops |
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Term
Name the 3 operating Setpoints for the SAC...
At What pressures do they come online. |
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Definition
Lead SP: 110 PSIG
Follow SP: 105 PSIG
Follow-Follow SP: 100 PSIG
Actuates 5 PSI below SP for 5 seconds. |
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Term
| If a SAC is in Auto and comes online how long will it stay unloaded before it will shut down |
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Definition
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Term
| State the purpose and operation of ST5 valves |
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Definition
Provides SW Cooling Water to the SAC
ST5 opens upon Breaker Closure (SAC Start)
ST5 Closes 30 minutes breaker open (SAC Stop)
Fails open upon loss of Control air |
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Term
| Which Buses Supply power to the SAC |
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Definition
#1 SAC = 1H6D
#2 SAC = 2G1D
#3 SAC = 1G1D |
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Term
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Definition
55g resivoir
Resivoir Heater maintains 80-120 F
2 Oil Pumps: MOP and AOP
AOP runs when SAC Breaker is open or Low oil preassure SP of 80 psig or Low-Low of 70 psig
AOP Shuts off when oil header builds to >125 psig (MOP up to speed) |
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Term
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Definition
| Provide clean, reliable, oil-free compressed air to Safety and Non-Safety related pneumatically operated instruments and control valves. |
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Term
| Control Air system is designed to... |
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Definition
| Supply Control air to both units for 4 hours in the event of a BO on one unit and the loss of C Vital bus on the other unit via the Station blackout air compressor. |
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Term
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Definition
| Units 1or 2 in Modes 1-6, no planned maintenance will be performed on an ECAC while the opposite unit ECAC is unavailable. |
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Term
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Definition
Manual:
1. Local (213 hot shutdown panel)
2. Remote (CC1)
Auto:
1. Low Control Air <85 psig Maintains 95 psig
2. All SAC breakers open
3. SEC actuation (breaker protection only SEC over ride
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Term
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Definition
Immediate:
Low Oil Pressure <15 psig
Motor Overload (only SEC trip not blocked)
Safeguards Load Shed
60 Second Delay:
Hi Lube Oil 150 F
Hi intercooler 150 F
Hi Discharge air temp 340 F
Hi inter-After cooler water level |
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Term
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Definition
| Shuts down after 12 minutes unloaded |
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Term
Station Blackout Air Compressors
Purpose/Location
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Definition
Diesel Driven with 135g Fuel oil Tank
(Not part of the Fuel Oil System)
Creates 750 SCFM
Sized to provide air to both units for 4 hours in the event of Total station Electrical Blackout
Manual Operation only
House in an Enclosure north of Unit 2 |
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Term
| What does the Air compressed by the SBO Air Compressor feed? |
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Definition
| Unit 1 and 2 via the #2ECAC system |
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Term
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Definition
Made up of two Dessicant Chambers with one always online and one in standby.
The alternating timer set for 5 minutes
Moisture content of each Chamber designated regeneration needs when unit is offline
LOP will place both chambers in service
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Term
| Name the Modes of operation for the Control Air dryers |
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Definition
AMLOC: Senses moisture and initiates drying
Fixed: Dries the Chambers every Swap |
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Term
| Control air dryers are powered from... |
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Definition
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Term
ECACs
(Emergency Control Air Compressors) |
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Definition
460V Motor driven, 2 stage compressor with inter and after coolersand self comtained oil system
#1ECAC fed from 1C 460 VB
#2ECAC fed from 2C 460 VB
Locations: U1 and U2 Chiller Rooms
Cooled by Chillwater or
(Spool piece backup from SW)
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Term
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Definition
Marotta "Flo-Fuse": Isolates piping downstream in the event of a pipe break or rupture
>180 SCFM at 90 psig closes the valve
Equalized pressure through a bypass valve will
re-open the valve as long as the problem has been mitigated. |
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Term
| Name the Control Air Isolation Valves and their Purpose |
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Definition
CA330s
Phase A isolation signal closes valves
Designed to fail closed upon loss of air
Designed to fail open upon loss of 125VDC or 28VDC |
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Term
| PORV Control Air Accumulators |
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Definition
Reserve Control Air supply to the PORVs
Each Porv has 2 accumulators sized for 100 open/closing cycles 50/accumulator
actuates @ <85 psi closes >90 psi |
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Term
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Definition
Used to backup air to loads (A+B Supply)
Ensures single failure operation capability.
If one header has a loss of air the other header will supply thru a 3-way diaphram operated switching valve. |
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