LOT 201.31 13.8 kV / 4.16 kV Electrical Flashcards Preview

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Flashcards in LOT 201.31 13.8 kV / 4.16 kV Electrical Deck (10):
1

LOT 201.31 13.8 kV / 4.16 kV Electrical


What is the order of 13.8 kV Aux Bus restoration?

F , G, H, J


Chosen b/c DP401 and DP402 are fed from F & G, which power CP010 metering.

2

LOT 201.31 13.8 kV / 4.16 kV Electrical


What happens if you are paralleling across a 13.8 kV tie breaker and forget to open the breaker?

1F / 1G / 1H Tie - STBY
15 sec alarms
30 sec opens the tie breaker
30.5 sec opens Aux / STBY incoming breakers AND the ESF Feeder Breakers

1F / 1G / 1H STBY - STBY
15 sec alarms
30 sec opens other unit's STBY Breaker
30.5 sec opens Tie / Unit's STBY incoming breakers AND the ESF Feeder Breakers
Does NOT open Aux incoming breaker

1J AUX - STBY
15 sec alarms
30 sec opens Aux Breaker
30.5 sec both STBY incoming breakers trip

1J STBY - STBY
15 sec alarms
45 sec opens other unit's STBY Breaker
45.5 opens unit's STBY breaker and AUX breaker

3

LOT 201.31 13.8 kV / 4.16 kV Electrical


Where are the major 13.8 kV transformers physically located?

Main Step-Up XFMRs
West of TB

UATs
West of TB
Between Main Step-Up and TB

Emergency XFMR
Switchyard

Standby XFMR
NE of TB

BOP XFMRs
E of TB

ESF XFMRs
SE of TB

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4

LOT 201.31 13.8 kV / 4.16 kV Electrical


What are some major loads powered from the 1D Loadcenters?

RCB/MAB Chillers

OLACW Pumps

Low Pressure Heater Drip Pumps

BTRS Chiller
May or May not be abandoned

5

LOT 201.31 13.8 kV / 4.16 kV Electrical


Where is the SUFW powered from?

1H Standby Bus


Note:
Unique b/c it is powered from the standby bus and NOT the aux bus.

6

LOT 201.31 13.8 kV / 4.16 kV Electrical


What provides control power for the RCP breakers?

125 VDC Bus 1B


Feeder breakers for the 13.8 kV Aux Buses are from the 125 VDC Bus 1A.

Precludes the possibility of losing both primary and backup protection of the containment penetration conductors for the RCPs?

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7

LOT 201.31 13.8 kV / 4.16 kV Electrical


Why are the switches for the "XFMR 1K1, 1L2 & 1P Feeder Breaker" and "XFMR 1J1, 1L1, 1S Feeder Breaker" on CP010 painted red?

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If the Rx fails to trip, can secure power to RDMGs with these switches.


Note:
Powered from 1K1 and 1L1

8

LOT 201.31 13.8 kV / 4.16 kV Electrical


What major loads are powered from the 13.8 kV Aux Buses?

RCPs

Condensate Pumps

CW Pumps

FW Booster Pumps

1D1/1D2 Load Centers

9

LOT 201.31 13.8 kV / 4.16 kV Electrical


Where is the 1L Switchgear physically located?

1L Switchgear:
EAB 23' N End

 

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10

LOT 201.31 13.8 kV / 4.16 kV Electrical


Where are the 13.8 kV switchgears and the 1D load centers physically located?

13.8 kV Switchgears
31' TB North End
13.8 kV Switchgear room

1D Load Centers
31' TB SE End
Room N of BOP Diesel

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