BOP-ESFAS

Question 1

What is the power supply for the Train A BOP-ESFAS Cabinet?

Answer 1

PNA and PKA auctioneered
Both converted to 24VDC
2 fans - 1 AC and 1 DC

Question 2

What is the power supply for the Train B BOP-ESFAS Cabinet?

Answer 2

PNB and PKB auctioneered
Both converted to 24VDC
2 fans - 1 AC and 1 DC

Question 3

What two RU monitors are responsible for the FBEVAS Actuations?

Answer 3

RU-31 (A)

RU-145 (B)

Question 4

What happens if just RU-31 alarms?

Answer 4

FBEVAS A and B

CREFAS A and B

Question 5

Happens if FBEVAS A is manually initiated from B05?

Answer 5

Just FBEVAS A will actuate

No cross trips

Question 6

A FBEVAS only actuates. Along with starting the required equipment, what else happens?

Answer 6

Fuel Building Normal Supply and Exhaust Fans stop.

A Fuel Building Normal Dampers Close

Question 7

B FBEVAS only actuates. Along with starting the required equipment, what else happens?

Answer 7

Fuel Building Normal Supply and Exhaust B dampers close. This is bad because the fans are still running and will overheat.

Question 8

Both trains of FBEVAS are running and a SIAS occurs. What happens?

Answer 8

The Fuel Building Essential AFUs will swap their suctions from the Fuel Building to the Aux Building.

Question 9

What two RU monitors are responsible for the CPIAS Actuations?

Answer 9

RU-37 (A)

RU-38 (B)

Question 10

What happens if just RU-38 alarms?

Answer 10

CPIAS A and B

CREFAS A and B

Question 11

What two RU monitors are responsible for the CREFAS Actuations?

Answer 11

RU-29 (A)

RU-30 (B)

Question 12

What is the basis for the CREFAS?

Answer 12

To maintain whole body exposure < 5 REM.

Question 13

A CREFAS only actuates. Along with starting the required equipment, what else happens?

Answer 13

Control Room Normal Supply and Exhaust Fans stop.

Question 14

B CREFAS only actuates. Along with starting the required equipment, what else happens?

Answer 14

Control Room Normal Supply and Exhaust dampers close. This is bad because the fans are still running and will overheat.

Question 15

What other equipment starts on a CREFAS along with the Control Room Essentials?

Answer 15

SP
EW
EC
CT (A and B)

Question 16

Along with the RU monitors, what else will actuate a CREFAS?

Answer 16

Either train of FBEVAS or CPIAS will actuate both trains of CREFAS. (unless the trip was initiated manually)

Question 17

What must be reset prior to resetting CREFAS?

Answer 17

FBEVAS and CPIAS

Question 18

What RU monitors actuate CRVIAS?

Answer 18

CRVIAS doesn’t have field inputs.

Question 19

What actuates a CRVIAS?

Answer 19

Manual actuation at B05 or at the BOP-ESFAS Cabinets

Question 20

The outside air dampers for the Control Room Essentials are open on a CREFAS. CRVIAS is initiated from B05. What happens to the outside air dampers?

Answer 20

They close. CRVIAS overrides SIAS and CREFAS

Question 21

What other equipment starts on a CRVIAS along with the Control Room Essentials?

Answer 21

SP
EW
EC
CT (A and B)

Question 22

Explain the layout for the UV relays on the Class 4160V buses.

Answer 22

4 degraded voltage relays and 4 loss of voltage relays come off of each PB bus. 1 DV relay and 1 LOV are paired to make one channel. One relay from each channel is enough to trip the channel. LOP actuation logic is 2/4 channels.

Question 23

What are the relay pair numbers for the Undervoltage Relays for the PB buses?

Answer 23

Channel 1 - 1/5
Channel 2 - 2/6
Channel 3 - 3/7
Channel 4 - 4/8

Question 24

What happens on a LOP in the BOP-ESFAS?

Answer 24

2/4 logic met on the Class UV relays. Sends signal to DGSS module resulting in a DG start. Signal also sent to Sequencer which generates 1 second Load Shed Pulse to keep from overloading the DG.

Question 25

What happens to the Class UV relays once the DG Output breaker closes in on the bus?

Answer 25

The UV relays reset.

Question 26

How long is the LOP signal once generated? Why?

Answer 26

60 seconds

To ensure the sequencer finishes

Question 27

What generates the signal to start the DG?

Answer 27

The DGSS

Question 28

In what mode does the DGSS place the DG?

Answer 28

TEST - every time

Emergency Mode is added later if needed.

Question 29

What will start the DG?

Answer 29

LOP
SIAS
AFAS 1/2
CSAS (test)

Question 30

What is MODE 0 for the BOP-ESFAS Sequencer?

Answer 30

No Input/Normal

Question 31

What is MODE 1 for the BOP-ESFAS Sequencer?

Answer 31

SIAS/CIAS

Question 32

What is MODE 2 for the BOP-ESFAS Sequencer?

Answer 32

SIAS/CIAS + LOP

Question 33

What is MODE 3 for the BOP-ESFAS Sequencer?

Answer 33

LOP

Question 34

What is MODE 4 for the BOP-ESFAS Sequencer?

Answer 34

AFAS
FBEVAS
CPIAS
CREFAS
DGSS
DG Run

Question 35

What must happen while changing BOP-ESFAS Sequencer Modes?

Answer 35

The Sequencer must pass through MODE 0

Question 36

What happens to the BOP-ESFAS on the loss of a Radiation Monitor?

Answer 36

Trip of both trains of the associated actuation and any associated cross trips

Question 37

What happens to the BOP-ESFAS on the loss of PN to on of the Cabinets?

Answer 37

You’ll lose one fan out of that cabinet

Question 38

What happens to the BOP-ESFAS on the loss of PN bus?

Answer 38

PNA and PNB power the Radiation Monitors associated with BOP-ESFAS. Therefore, you’ll get trips associated with the Rad Monitor failures

Question 39

What happens to the BOP-ESFAS on the loss of PK to on of the Cabinets?

Answer 39

You’ll lose one fan out of that cabinet

Question 40

What happens to the BOP-ESFAS on the loss of PK bus?

Answer 40

UNIT 1 (A and C) - Loss of PN - BOP-ESFAS Train OOS
UNIT 2 and 3 - Auto transfer to Voltage Regulator.

Question 41

Does the Sequencer start the DG or position valves?

Answer 41

Neither. The DGSS starts the DG and ESF positions valves.