TB Vent

Question 1

WHat is the purpose of TB Vent?

Answer 1

Maintain temps between 65F and 120F

Question 2

WHat are the general intended flow/pressure characteristics for TB Vent?

Answer 2

Flow from least to most contaminated w/ a dp of -0.25” WC between clean areas and areas potentially contaminated to prevent leakage out.

Question 3

What will cause the trips of all TB Fans?

Answer 3

High Pressure (+2.2"WC) trips supply fans
Lo Pressure (-2.7"WC) trips all exhaust fans
Lo Flow trips - w/ standby fan autostart

Question 4

What are the supply fan power sources for N and S Turb Building Vent?

Answer 4

N Supply: A/C on 25, B on 26

S Supply: A on 28, B on 29

Question 5

How many supply fans are there for the three systems?

Answer 5

3 for North
2 for South
3 for East

Question 6

How many exhaust fans are there for the 3 TUrbine Building Vent Systems?

Answer 6

3 for North and South - Shared

3 for East

Question 7

What are teh power supplies for North and South Turb Build Vent Exhaust Fans?

Answer 7

A - Bus 25
B - Bus 26
C - Bus 27

Question 8

What are teh power sources for the East Tb Vent Fans?

Answer 8

ALL 6 (3 supply, 3 exhaust) powered by MCC 26-4

Question 9

WHat alternate purpose can teh E. TB Vent Supply?

Answer 9

Can provide Cooling/Purge Air for AEER when needed (Backup to AEER Vent)

Question 10

How is TB Vent System Monitored for Radiation?

Answer 10

The North and SOuth Exhaust to the 2/3 Chimney, which is monitored by the SPING. This is a major source of dilution air.
The East TB Vent is not monitored

Question 11

WHat actions are needed to start a TB Vent Fan?

Answer 11

Hold Closed for 45 seconds - this bypasses low flow trips when held in closed.

Question 12

Where does N/S TB Vent Exhaust to?

E TB Vent?

Answer 12

N/S exhausts out 2/3 Chimney

E Exhausts out north side of building (OR THROUGH RECIRC)

Question 13

What areas are fed by N/S TB Vent?

Answer 13

CCSW/Cond Pp Areas, Clean Dirty Oil Tank Room, general TB areas

Question 14

What powers the CCSW/Cond Area Vent?

Answer 14

MCC 25-2

Question 15

What powers the D Heater Area Booster Fan?

Answer 15

MCC 26-4

Question 16

What is in the air mixing box for E. TB Vent?

Answer 16

Filters, Hot Water Heating Coils

Question 17

What will cause cause an autostart of TB Vent Fans?

Answer 17

Lo Flow through running Fan

Question 18

What will caust an auto trip of TB Vent Fans?

Answer 18

Hi TB or RW Pressure - Trips Supply Fans

Lo TB or RW Pressure - Trips Exhaust Fans

Question 19

What redundant featers are available in TB Vent System?

Answer 19

ALl TB Vent systems provide redundant fans provided with auto start of standby fan if low flow through running fan is sensed by DP