VI, VS, VB

Question 1

What is the purpose of the VI system?

Answer 1

Supplies dry, oil free, compressed air for instrumentation and control to various components of both units.

Question 2

What is the purpose of the VS system?

Answer 2

Supplies low pressure compressed air for air operated tools, miscellaneous equipment, and various maintenance purposes

Question 3

What is the purpose of the VB system?

Answer 3

Supplies clean, oil free, compressed air to various locations in the Auxiliary Building, Monitor Tank Building, and Containment for breathing protection against airborne contamination while performing certain maintenance and cleaning operations.

Question 4

What happens when VI pressure reaches 96 psig?

Answer 4

If ASC is controlling, an individual compressor will start loading

Question 5

What happens when VI pressure reaches 94 psig?

Answer 5

If Centac Microcontroller is controlling, a standby compressor will start (“Hot Restart”)

Question 6

What happens when VI pressure reaches 85 psig?

Answer 6

1VI-487 and 1VI-488 (Dryer Purge Exhaust Mufflers) close

Question 7

What happens when VI pressure reaches 80 psig?

Answer 7

-1VI-670 “VI Dryer Auto Bypass” opens.
-1VI-500 “VI supply to VS” closes.

Question 8

What happens when VI pressure reaches 76 psig?

Answer 8

1VS-78 “VS supply to VI” opens

Question 9

What is the power supply to “E” VI compressor?

Answer 9

1LXI (Blackout Load Center)

Question 10

What is the power supply to “F” VI compressor?

Answer 10

2LXH (Blackout Load Center)

Question 11

What is the power supply to “D” VI compressor?

Answer 11

2SLXC (Shared Load Center)

Question 12

Which VI compressors can get backup cooling from the RF system if KR cooling is lost?

Answer 12

E and F VI compressor

Question 13

At what VI pressure will the Reactors be tripped?

Answer 13

55 psig per AP/0/A/5500/022 (Loss of VI)

Question 14

What system supplies the normal cooling water to the VI compressors?

Answer 14

KR (Recirculated Cooling Water

Question 15

When the Backup Diesel Air Compressor are placed in service, where does the compressor discharge connect to the VI system?

Answer 15

Downstream of the VI dryers.

Question 16

When does the Base VS compressor start?

Answer 16

Starts 90 psig
Unloads 100 psig

Question 17

When does the Standby VS compressor start?

Answer 17

Starts at 85 psig
Unloads at 95 psig

Question 18

What system cools the station air compressor oil coolers?

Answer 18

Recirculated Cooling Water (KR)

Question 19

What system cools the VS compressor aftercooler?

Answer 19

Conventional Low Pressure Service Water (RL)

Question 20

What are the power supplies to the VS compressors?

Answer 20

VS Air Compressor A 1SLXC
VS Air Compressor B 2SLXC

Question 21

What signal closes VI-77B (VI CONT ISOL)?

Answer 21

Sp

Question 22

What signal closes VI-312A (VI TO VP CONT ISOL)?

Answer 22

St

Question 23

What signal closes VS-54B (VS CONT ISOL)?

Answer 23

St

Question 24

What system supplies air to the Main Turbine bearing deluge system?

Answer 24

VS

Question 25

What system cools the VB compressor aftercoolers?

Answer 25

Service Building Chilled Water (YW) System

Question 26

What system cools the VB compressor oil coolers and the heat exchangers associated with the dryer?

Answer 26

Recirculated Cooling Water (KR) System

Question 27

What signal closes VB-83B (VB CONT ISOL)?

Answer 27

St

Question 28

What are the VB compressor trips?

Answer 28

-High compressor discharge temperature - 235 degrees F -High discharge pressure - 135 psig -Dryer failure - Low evaporator pressure or high condenser pressure -High carbon monoxide - 10 ppm -Low KR pressure - 10 psig Motor Overload

Question 29

What are the VB compressor power supplies?

Answer 29

VB Air Compressor A Motor - SMXU VB Air Compressor B Motor - SMXS

Question 30

When does the VB compressor i the "BASE 1" mode start?

Answer 30

Starts at 95 psig Unloads at 105 psig

Question 31

When does the VB compressor i the "BASE 2" mode start?

Answer 31

Starts at 85 psig Unloads at 95 psig