Aux Bldg HVAC

Question 1

Auxiliary Building Essential HVAC System is designed to maintain the Auxiliary Building below the \_\_\_\_\_\_ elevation at a negative pressure post-LOCA
A.  70'
B.  100'
C.  120'
D.  140'

Answer 1

B
The Auxiliary Building Essential HVAC System is designed to maintain the Auxiliary Building below
the 100’ elevation at a negative pressure post-LOCA to prevent unfiltered release of possible
airborne radioactivity to the surroundings.

(EO 1.1)

Question 2

During postulated emergency conditions, the Auxiliary Building Essential HVAC System maintains the required thermal environment for all of the following EXCEPT: 
A.  ESF Pump Rooms
B.  Aux Feedwater 'A' Pump Room 
C.  Aux Feedwater 'N' Pump Room
D.  Essential Pipe Density Tunnel

Answer 2

C. Aux Feedwater ‘N’ Pump Room

EO 1.1

Question 3

The Aux. Normal AHUs are cooled by:
A.  Nuclear Cooling Water
B.  Normal Chilled Water
C.  Essential Chilled Water
D.  Aux Chilled Water

Answer 3

B. Normal Chilled Water

EO 1.3

Question 4

A Safety Injection Actuation Signal (SIAS) will isolate the Auxiliary Building below the 100’ elevation from the Normal Aux Bldg HVAC System and align the Fuel Bldg Essential AFUs to draw on the areas of the Auxiliary Building below the 100’ elevation.

True or False

Answer 4

True

EO 1.3

Question 5

The Aux Feedwater Pump Rooms’ supply and exhaust ducts (HAAM216 and HAB217 on supply duct and HAAM214 and HABM215 on exhaust duct) will close
when ________
A. high water level is sensed in either pump room
B. high differential pressure is sensed in either duct
C. the fusable link melts
D. a SIAS signal

Answer 5

A. high water level is sensed in either pump room. This action prevents water from a leak in one AF Pump Room from flooding the other AF Pump Room through the ducting.

(EO 1.5)

Question 6

The Aux Bldg Normal Supply AHU is interlocked with the Aux Bldg Normal Exhaust AFU such that the Exhaust AFU must be started first. If an Exhaust AFU is not running or trips (Low DP) then the related Supply AHU will not start or will stop.

True or Fals

Answer 6

True
This is to ensure the Aux. Bldg is kept at a negative pressure.

(EO 1.8)

Question 7

The Charging Pump ACU starts when the associated Charging Pump is started. When the Charging Pump is stopped _______
A. the ACU is stopped
B. a time delay actuates and runs for 5 more minutes before stopping the ACU
C. the ACU will keep running
D. a local TIC controls the ACU status

Answer 7

B. a time delay actuates and runs for 5 more minutes before stopping the ACU

(EO 1.18)