LOT 201.37 Class 1E 125VDC

Question 1

• LOT 201.37 Class 1E 125VDC*
• • *

What is the maximum current and voltage that the class 1E battery chargers can output?

Answer 1

300 amps

• *140 VDC**
• Equalizing Charge is 135VDC - 137VDC*

Question 2

• LOT 201.37 Class 1E 125VDC*
• • *

Where are the components for the Class 1E 125VDC Train B (Channel III) physically located?

Answer 2

EAB 35’

Question 3

• LOT 201.37 Class 1E 125VDC*
• • *

How many battery chargers are in-service per channel on the Class 1E 125VDC system?

Answer 3

One Battery Charger

Class 1E battery charger output breakers are administratively controlled to prevent both breakers being closed at the same time. (Allowed for 15 mins for battery charger swapping)

• Note:*
• Non-Class 1E 125VDC has both battery chargers connected.*

Question 4

• LOT 201.37 Class 1E 125VDC*
• • *

What are some loads powered from the Class 1E 125VDC system?

Answer 4

Train A/B/C:

(A / B ONLY)
Rx Trip Breaker Control Power
PZR PORVs

ESF DGs:
Field Flash
Sequencers (A/B/C)
PL-139A/B/C (DG Control Panels)

ESF:
4.16 kV / 480V ESF Control Power
PL-39A/B/C (EAB)
Class 1E 120V Inverters

Train D:

• *Terry Turbine MOVs**
• *PL-40A (EAB)**
• *Class 1E 120V Inverter (1202)**

Question 5

• LOT 201.37 Class 1E 125VDC*
• • *

Where are the components for the Class 1E 125VDC Train A (Channel I) and Train D (Channel II) physically located?

Answer 5

EAB 10’

Question 6

• LOT 201.37 Class 1E 125VDC*
• • *

What is the minimum Individual Cell Voltage (ICV) allowed on the Class 1E batteries?

Answer 6

2.07 VDC
LCO 3.8.2.3 Battery Parameters

Battery overall voltage must be ≥128.03 VDC to make battery OPERABLE. (59 cells x 2.17 avg volts/cell)

Question 7

• LOT 201.37 Class 1E 125VDC*
• • *

How long will the Class 1E batteries last on a loss of battery charger power?

Answer 7

4 hrs

• Note:*
• Non-Class batteries will only last 2 hrs.*

Question 8

• LOT 201.37 Class 1E 125VDC*
• • *

What powers the Class 1E 125VDC Buses (E1A11/E1B11/E1C11/E1D11)?

Answer 8

• Channel I:*
• *E1A11: E1A1 / E1A2**

Channel II:
E1D11: E1A4 / E1A1

• Channel III:*
• *E1B11: E1B1 / E1B2**
• Channel IV:*
• *E1C11: E1C1 / E1C2**

1 2 4 1 1 2 1 2

Question 9

• LOT 201.37 Class 1E 125VDC*
• • *

What actions are required if one of the required Class 1E battery banks is inoperable while the plant is in MODE 1?

Answer 9

LCO 3.8.2 DC Sources Operating

Applicable in MODES 1 - 4

Action a:

Restore Inoperable battery bank [2 hrs]

OR

Apply CRMP [2 hrs]

OR

Be in MODE 3 [Next 6 hrs]
AND
Be in MODE 5 [Following 30 hrs]

Question 10

• LOT 201.37 Class 1E 125VDC*
• • *

Where are the components for the Class 1E 125VDC Train C (Channel IV) physically located?

Answer 10

EAB 60’

Question 11

• LOT 201.37 Class 1E 125VDC*
• • *

Where in the MCR is the indications for the Class 1E 125VDC system?

Answer 11

CP003