Term
DC Power Distribution
Purpose |
|
Definition
| To supply 250/125/28 VDC to Vital systems during normal, transient, and accident conditions |
|
|
Term
|
Definition
250 VDC supplies highly reliable power to the Main Feed Pump and Main Turbine Generator emergency auxiliaries
125 VDC provide reliable control power to all plant auxiliaries. CW has its own seperate 125 VDC battery supply and chargers.
28 VDC supplies reliable control power to all plant auxiliaries.
NO initiation or control is needed to supply DC from the batteries to the bus.
All battery chargers carry all loads under normal power.
All Batteries are sized for 2 hours of operation during LOPA and chargers regain loads when EDGs come online. |
|
|
Term
|
Definition
1 bank per unit
120 cells at 2.2 v per cell
2A1 and 2A2 Primary and Backup Battery chargers.
Located on 100' in the 250 VDC battery room adjacent to the 125/28VDC battery room adjacent to the relay room.
FEED: #1 and #2 SGFP Emergency Oil Pump
Main Turbine Emergency Oil Pump
U1 and U2 Emergency Seal Oil Pumps |
|
|
Term
Two modes of operation for all battery chargers are?
State each modes purpose.... |
|
Definition
1. Float
Charger supplies all loads and maintains a slight charge on the battery bank.
2. Equalize
Charger supplies all loads and provides a larger current at a higher voltage on the battery bank to restore battery capacity to its maximum charge. |
|
|
Term
Where are the 250VDC battery chargers located?
125VDC Chargers?
28VDC Chargers? |
|
Definition
460V switchgear room 84'
460V switchgear room 84'
Relay and Battery RM 100' |
|
|
Term
|
Definition
3- 125VDC battery banks A,B,C
6 Battery chargers(Primary and Backup for each)
60 Cells for each Battery Bank
Location: A/B 100' Battery room and
C 64' 4KV Switchgear
Each Battery is rated for 2 hours of operation during a LOPA.
FEED: Control power for relays, breaker control, and indications. |
|
|
Term
| During a complete loss of AC power (OSP and Diesel loss) which chargers can be supplied by a portable DG? |
|
Definition
125 VDC Backup Battery Chargers
2A2,2B2, and 2C2
1A2,1B2, and 1C2
28VDC Backup Battery Chargers
1A2 And 2A2 |
|
|
Term
125VDC system distibution has how many cabinets?
How can they be aligned? |
|
Definition
7 cabinets of distribution.
Each cabinet can be supplied power from 2 seperate 125VDC buses through mechanical interlocked circuit breakers located in the cabinets.
The infeed breakers are designated Regular (R) and Emergency (E) |
|
|
Term
| 125 VDC CW Distribution System... |
|
Definition
2- 125VDC CW Battery Banks (1 per unit)
2 Spare Cells
6 Battery chargers (3 per Bank)
Located in the CW Switchgear building. |
|
|
Term
| 28VDC Distribution System... |
|
Definition
2 Battery Banks per Unit
4 Battery chargers (2 primary and 2 backup)
Powered from the EDGs in the event of a LOPA
Sized to last 2 hours in te event of a total LOPA
Location: 100' battery room shared with A/B 125VDC
FEED: Control power for indication and MCR control bezzels, VIB, Annunciators,
Status Panel RP4 |
|
|
Term
28VDC Ditribution Cabinets...
How can they be aligned in an accident? |
|
Definition
4 cabinets of distribution.
Each cabinet can be supplied power from 2 seperate 28VDC buses through mechanical interlocked circuit breakers located in the cabinets.
The infeed breakers are designated Regular (R) and Emergency (E) |
|
|
Term
What are the power sources for the 125VDC Battery Chargers?
28VDC Battery Chargers? |
|
Definition
125VDC 2A1=2A 230V, 2A2(Backup)=2C
125VDC 2B1=2B 230V, 2B2(Backup)=2A
125VDC 2C1=2C 230V, 2C2(Backup)=2B
28VDC 2A1=2A 230V, 2A2(Backup)=2C
28VDC 2B1=2B 230V, 2B2(Backup)=2C
|
|
|
