480V

Question 1

Discuss 4 methods of electrical fault protection for Containment penetraitions

Answer 1

2 motor starters in series for motors <5HP
1 thermal magnetic breaker with 1 motor starter for motors>5HP
2 thermal magnetic circuit breakers in series
T.S. 3.8.4.1 Locked breakers

Question 2

Discuss actions required to reclose Breaker that has tripped from 86 relay

Answer 2

condition must be clear (ground fault/ overcurrent)

86 device locally reset

Question 3

Discuss operation of 480V ground detection

Answer 3

3 Volt meters, 1 per phase
grounded phase decreases potential across transformer, indication decreases
other phases indication increases

Question 4

List 125VDC use in a US

Answer 4

Control power
Breaker position indication
relay power

Question 5

what Load Center is powered from 4160

Answer 5

Load center 3 for FPH

Question 6

List power supplies for SWYD ABT

Answer 6

Normal: US:14/26
Emergency: US-53
Normal power seeking

Question 7

List loads of SWYD ABTs

Answer 7

Battery chargers
345kV breaker auxiliaries
120/240V distribution panels

Question 8

Discuss indications in SWYD ABTs

Answer 8

2 white lights- power available
Green light - powered from normal source
Red light - powered from emergency source
2 amber lights - supply breakers trip on overload

Question 9

List setpoints for US fan

Answer 9

Fan start: 375F

Alarm: 410F

Question 10

Discuss T.S. 3.8.3.2

Answer 10

Immediately suspend core alterations statement for degraded electrical (Modes 5/6)

Question 11

Discuss T.S. 3.8.4.1

Answer 11

Breakers but be tripped open in found closed (modes 1,2,3) with in 1 hour unless controlled by procedure for up to 72 hours