BYS

Question 1

A loss of what station battery will cause a reactor scram if prompt operator action is not taken? Why?

Answer 1

Batt 1B, when lost, the B feedwater flow transmitter gets de-energized which causes FWLC to open the LV10’s. If manual FWLC is not taken, the plant will go out on Level 8

Question 2

What batteries available in the plant?

Answer 2

BYS-BAT1A/B/C - Normal Station Batteries
BYS*BAT2A/B/C - Divisional Batteries
BWS-BAT3A/B/C/D - SRM/IRM Batteries

Question 3

What are the battery charger CLAMP Ratings?

Answer 3

BYS-CHGR1A1/B1/C1 - 675 Amps
BYSCHGR2A1/B1/A2/B2 - 345 Amps
BYSCHGR2C1/C2 - 57.5 Amps
BWS-CHGR3A1/B1/C1/D1 - 29 Amps

Question 4

What are the Amp-Hour Ratings on the batteries?

Answer 4

BYS-BAT1A/B/C - 5100 Amp-Hrs
BYSBAT2A/B - 2550 Amp-Hrs
BYSBAT2C - 100 Amp-Hrs
BWS-BAT3A/B/C/D - 100 Amp-Hrs

Question 5

How many cells are in each battery?

Answer 5

BYS-BAT1A/B/C - 120 Cells
BYSBAT2A/B - 60 Cells
BYSBAT2C - 60 Cells (2 Jars w/3 Cells each)
BWS-BAT3A/B/C/D - 12 Cells

Question 6

What is the Full Load coping times for the batteries?

Answer 6

2 hours, with the exception of the Batt 3’s which are 4 hours

Question 7

What are the power supplies for the battery chargers?

Answer 7

CHGR1A - NJS-US5
CHGR1B/C - NJS-US6
CHGR2A - EJS*PNL100A (EJS*US1)
CHGR2C - LAC*PNL100A (EJS*US1)
CHGR2B - EJS*PNL100B (EJS*US3)
CHGR2D - LAC*PNL100B (EJS*US3)
CHGR3A1/3C1 - NJS-PNL500 (NJS-US5)
CHGR3B1/3D1 - NJS-PNL600 (NJS-US6)

Question 8

At what voltage do we declare a ground and take action?

Answer 8

75 Volts DC

Question 9

What is the normal float voltage for a battery charger?

Answer 9

125 volt charger - Float of 135 VDC

24/48 volt charger - Float of 29 VDC

Question 10

An over-voltage condition occurs on the A DC Bus, What happens?

Answer 10

The battery charger supplying the bus will have it’s AC input breaker TRIP OPEN

Question 11

How does a loss of DC affect the RCS System?

Answer 11

A loss of BYS-SWG1A will cause the A RCS Pump to trip immediately.
A loss of BYS-SWG1B will cause the B RCS Pump to trip upon power restoration.
A loss of Div 1 or 2 DC will trip BOTH RCS Pumps

Question 12

Which DC Bus supplies the control power to the normal switch-gear supply breakers?

Answer 12

BYS-SWG1A

Question 13

Which DC Bus supplies the control power to the normal switch-gear load breakers?

Answer 13

BYS-SWG1B

Question 14

Which DC Bus supplies the control power to the normal unit subs(NJS-US1 through 10)?

Answer 14

BYS-SWG1A

Question 15

What are the control power supplies to all the disconnects in the Unit 2 switch-yard?

Answer 15

BYS-SWG1A supplies control power to YUC-MDS1, 3, 5, & 10 (115KV)
BYS-SWG1B supplies control power to YUC-MDS2, 4, 20 (115KV) and YXC-MDS1 (345KV)