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29 Cards in this Set
- Front
- Back
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Purpose of Instrumentation Electrical System |
Supply electrical control and instrumentation power to both the ESS (safety-related) and BOP (non-safety related) systems.
Supplies electrical power to heat trace circuits, lighting, and miscellaneous plant service loads at 120/280VAC or 120/240VAC or 110/220VAC. -AMSAC Power -Aux, Containment and TB Normal and Standby Lighting -Control Room Lighting -Control Room Instrument Distribution (CRID) -Control Room Power (CRP) -Critical Control Room Power (CCRP) -Emergency Lighting -Heat Tracing -Technical Support Center Uninterruptible Power Supply (TSC UPS) |
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AMSAC Inverter |
The AMSAC power circuit supplies rectified and regulated 120V AC electrical power to the tripping, actuating and testing circuits of the AMSAC system. Makes 24 VDC control power for the relays |
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Unit 1/2 Lighting (normal and standby) |
The normal lighting systems provides power for normal lighting and miscellaneous loads. The Normal and Containment Lighting transformers are powered from Safety Related 600 Volt AC busses (11(21A and 11(21)D)
The Plant Standby Lighting System provides a backup source of 120V AC electrical power to various plant lighting and system loads. The standby lighting transformer is powered from 600 VAC Safety Related bus 11(21)C |
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Control Room Instrument Distribution (CRID) |
The CRID system supplies continuous and reliable electrical power to all safety-related power, control, and instrumentation loads fed from the CRID system. The CRID System provides 120VAC ESS power to the essential instrumentation RPS, and ESF systems. Each distribution network consists of a static inverter, a regulating transformer, and a distribution panel. There are three sources of power for each distribution network. |
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Control Room Lighting |
Supplies an uninterruptible supply of emergency lighting to support safe shutdown of the plant |
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Control Room Power (CRP) down to RPI power from CRP-3 |
Control Room Power provides unregulated power for most control room loads |
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Critical Control Room Power |
CCRP provides reliable regulated power for the control and monitoring of systems important to safety. |
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Emergency lighting |
Supplies an uninterruptible supply of lighting power to support fire brigage access and egress, as well as access to critical plant components that support Appendix R requirements. |
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TSC UPS |
provides an uninterruptible source of regulated 120VAC power to the plant security system, plant process computer system, and miscellaneous TSC loads. |
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Auto Bus Transfer-1 &2 |
CR lighting ABT's
Receive power from an Auxiliary Building Lighting Distribution Panel on the Plant Standby Lighting Distributon Panel West |
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ABT-3 |
Supplied from AB1(2)W (Normal) and PSBW (emergency)
Feeds cabinets CRP-1 and CRP-2 |
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ABT-4 |
Supplied inverter output to three CCRP cabinets
With Inverter failure, transfers CCRP cabinets power supply to alternate source CRP-3 |
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ABT-5 |
Supplies from AB1(2) E (Normal) and PSBE (emergency) Feeds CRP-3 |
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TSC UPS Operation |
TSC-UPS Automatic Bus Transfer Switch - Provides automatic transfer of the normal batter charger supply from 600V ESS Bus 11C to the 600V Security Bus
TSC-UPS 600V AC Distribtuion Cabinet - Provides 225 AMP supply lines to each TSC-UPS Battery Charger |
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Constant Voltage Transformer (Isolimiter) |
Provides an alternate source of power (600 VAC vital buses to the CRID Busses routed through the Static Transfer Switch on the Manual Bypass Switch. |
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CRID Bus |
TS credited. Supples via inverted DC Voltage or regulated 600/120 VAC transformer via the static transfer switch or normal manual bypass switch in the inverter cabinet.
Can be supplied bia CRP-3 bvia manual bus transfer |
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CRID Inverter |
Static Inverter: Converts DC power from the battery bus to a stable AC output.
Compares the frequency and phase of a reference sinewave to the inverter output and causes the inverter to run at the same frequency and in phase with the alternate source -A frequency detector determines if alternate source and inverter output frequency syncronize. -The phase detector circuit causes an in-frequency/in phase conditions to exist. |
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Static Transfer Switch |
provides a virtual zero time transfer to the alternate source in case of inverter failure. |
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Interlocks on ABT-1 thru ABT-5 and 12 TSC-UPS-ABT |
On a loss of power, the BT transfers to the standby source.
When the normal restores, the ABT auto swaps to the normal source |
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CRID Static Switches |
Transfers on any of the three abnormal operation
-Failure or deterioation of the inverter square wave -Failure or deterioation of the sinusoidal output voltage of the Fero-resonant filter (CVT) -Branch load fault or simply an overload that exceeds the current capacity of th inverter or CVT |
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CRID Auto-retransfer lockout |
30 seconds after the static swith transfer even ceases and all system parameters are normal, the satic swith will automaticaly retransfer the load to the inverter with out power interruption.
The auto transfer cpability then locks out until manipulation of the auto transfer reset pushbutton on the inverter front panel is depressed
Therefore if a second transfer to the alternate source occurs before the auto-retransfer capability resets, the alternate source supplies the load until a manual transfer. |
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Backup Power Supply to the TSC-UPS |
Security power Distribution provides emergency power to the TSC-UPS distribution System. A loss of this system will have no effect on the TSC-UPS distribution system if the normal power supply from bus 11C is in service |
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CRID Functional Indications |
Bus Voltage 115-121 VAC Bus Frequency 59.1 to 60.9 Hz |
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CCRP Inverter Functional Indications |
Normal Voltage 115-121 Voltage(during startupmay be as high as 124)
CCRP Inverter Frequency 59.3 to 60.7 Hz
Amps out less than 125 amps |
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CCRP Normal Feed Lieght |
VIa ABT-4 |
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CRID Power Supplies |
ABCD ->3412 Backup CRP-3 |
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Control Room Lights are power from: |
ABT-1(AB1W) and ABT-2(AB1E) |
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CRP 1,2 are power from |
ABT3 11A->South Plant Lighing Transformer to the AB1W ->ABT3 |
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CRP-3 is power from |
ABT-5 |
