LOT 201.31 13.8 kV / 4.16 kV Electrical

Question 1

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

What is the order of 13.8 kV Aux Bus restoration?

Answer 1

F , G, H, J

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

Question 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?

Answer 2

• 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**

Question 3

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

Where are the major 13.8 kV transformers physically located?

Answer 3

• 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**

Question 4

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

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

Answer 4

RCB/MAB Chillers

OLACW Pumps

Low Pressure Heater Drip Pumps

• *BTRS Chiller**
• May or May not be abandoned*

Question 5

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

Where is the SUFW powered from?

Answer 5

1H Standby Bus

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

Question 6

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

What provides control power for the RCP breakers?

Answer 6

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?

Question 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?

Answer 7

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

• Note:*
• Powered from 1K1 and 1L1*

Question 8

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

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

Answer 8

RCPs

Condensate Pumps

CW Pumps

FW Booster Pumps

1D1/1D2 Load Centers

Question 9

• LOT 201.31 13.8 kV / 4.16 kV Electrical*
• • *

Where is the 1L Switchgear physically located?

Answer 9

• 1L Switchgear:*
• *EAB 23’ N End**

Question 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?

Answer 10

• 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**