ESF/Non-ESF switchgear room, MEER, and battery room Ventilation (VX/VE)

Question 1

Generic starts/trips of fans

Answer 1

Starts:
1. Local C/S
2. NO high ΔP across fan
3. NO ionization detection
Trips:
1. Local C/S
2. High  ΔP across fan
3. Ionization detection

Question 2

Division 11 lower cable spreading room ventilation supplied by_______ and division 12 lower cable spreading room ventilation supplied by______.

Answer 2

Aux building ventilation; CABLE SPREADING ROOM
VENTILATION FAN (WITH DIV.
12)

Question 3

Loss of Offsite Power and Subsequent Power Restoration

Answer 3

All fans will restart except Non-ESF SWGR Fans

Question 4

DIV 12/22 MEER Operations

Answer 4

1) Supply fan runs continuously
2) Temp Control Dampers do not modulate
3) Two Modes of operation:
- Outside Air - at 80F, outside air damper opens and
recirc closes
- Recirc - at 70F outside air damper closes and recirc
opens
4) Exhaust Fan starts at 80F increasing and stops at 70F
decreasing
- Control Switch must be kept in “After Stop” for fan to
cycle automatically on temperature

Question 5

To Reset from High Fan ΔP

Answer 5

-Take local control switch to
PULL OUT
-Fans normally controlled locally

Question 6

Fire in any room will:

Answer 6

1) Trip associated fan
2) High temp in room causes fire
dampers to drop

Question 7

Purge Switch Actions

Answer 7

• Fails recirc damper closed
• Fails outside air damper open
• Bypasses ionization trip

Question 8

ESF Supply fans can be operated from _________
Non-ESF supply fans can be operated from________
Exhaust fans can only be operated ________

Answer 8

MCR or locally; locally; locally

Question 9

Exhaust fan supplied for each battery room to maintain hydrogen concentration <_____

Answer 9

2%

Question 10

Where do most ESF vent systems draw in outside air?

Answer 10

Supply air to each system is from respective D/G Outside Air Intake, except SXCT which has its own outside air intake for each substation

Question 11

Battery room admin temperature limit is:

Answer 11

> =65F

Question 12

How is temperature controlled ? (Except division 12 meer)

Answer 12

Room temp is controlled by modulating the amount of air recirc’d to the amount that is supplied from outside via motor operated dampers.

Question 13

Div 11 esf swgr plenum/fan also supplies______; Uses ____ for temp control.

Answer 13

Div 11 MEER; Mixed air

Question 14

Div 11 MEER exhaust fan must run whenever supply fan is running to prevent________.

Answer 14

Higher pressure in Div 11 MEER relative to MCR.

Question 15

TLCO 3.7.d area temp monitoring

Answer 15

Room temp limits shall not be exceeded >8 hours, or by >30F whenever affected area equipment is required to be operable.

108F for rooms with this system.