Fuel Building HVAC

Question 1

Unit 3 is at 100% power with all systems in their normal lineup.
RU-31, Fuel Pool Area Monitor, has a HIGH alarm.
An RCS leak causes a reactor trip, SIAS, and CIAS.
Fuel Building Essential AFU HFB-J01 is ___(1)___. HFA-J01 is aligned to ___(2)___.
A. (1) running; (2) the Fuel Building
B. (1) running; (2) the Aux Building
C. (1) not running; (2) the Fuel Building
D. (1) not running; (2) the Aux Building

Answer 1

B

Question 2

Of the fuel building exhaust and supply units, which has the higher capacity and why?

Answer 2

Exhaust has the higher capacity to maintain a negative pressure on the fuel building.

Question 3

What is the location of the fuel building AHUs?

Answer 3

Aux building roof near the elevator.

Question 4

What is the location of the fuel building normal exhaust units?

Answer 4

Fuel Building roof.

Question 5

Describe the fuel building ventilation isolation damper arrangement.

Answer 5

There are 8 dampers total, 4 for the supply and 4 for exhaust isolation. They are arranged in two sets of two dampers in series on both supply and exhaust sides of the ventilation, and each line has one ‘A’ train valve and one ‘B’ train valve for redundancy.

Question 6

What is the location of the Fuel Building essential AFUs?

Answer 6

100’ of the Fuel Building.

Question 7

Where do the Fuel Building AFUs take suction?

Answer 7

From either the Fuel Building or the of the Aux Building.

Question 8

What tanks are vented to the Fuel Building HVAC?

Answer 8

RWT and HUT are both vented to HF system.

Question 9

What occurs when exhaust plenum temperature decreases to 65F?

Answer 9

The AHU heaters will turn on to heat the Fuel Building.

Question 10

What occurs on a low flow in the HF system?

Answer 10

Heaters will be turned off to protect from overheating

Question 11

Fuel Building Normal Exhaust AHUs are powered from which of the following?
A.  NHN-M04
B.  PHA-M33
C.  NGN-L04
D.  PGA-L31

Answer 11

A

Question 12

Unit 3 is at 100% power with all systems in a normal lineup.
‘B’ train FBEVAS is actuated from B05.
___(1)___ Fuel Building Normal Supply and Exhaust isolation dampers are closed, and the Fuel Building Normal Supply and Exhaust fans are ___(2)___.
A. (1) ONLY ‘B’ Train; (2) running
B. (1) ONLY ‘B’ Train; (2) not running
C. (1) BOTH ‘A’ & ‘B’ Train; (2) running
D. (1) BOTH ‘A’ & ‘B’ Train; (2) not running

Answer 12

A

Question 13

What is the power supply to Fuel Building Essential Air Handling Unit HFA-J01?
A.  PGA-L31
B.  NGN-M04
C.  PHA-M37
D.  NHN-M04

Answer 13

C

Question 14

Which of the following is vented to the Fuel Building Exhaust header?
A.  Recycle Monitor Tanks
B.  CVCS Hold-up Tank
C.  Liquid Radwaste TDS Tanks
D.  Reactor Makeup Water Tank

Answer 14

B

Question 15

Complete the following statement concerning Fuel Building Normal HVAC:
A greater or equal number of ___(1)___ fans than ___(2)___ fans must be running to maintain the Fuel Building at a ___(3)___ pressure relative to atmosphere.
A. (1) supply; (2) exhaust; (3) positive
B. (1) supply; (2) exhaust; (3) negative
C. (1) exhaust; (2) supply; (3) positive
D. (1) exhaust; (2) supply; (3) negative

Answer 15

D

Question 16

‘B’ FBEVIAS actuates. What is the status os the fuel building normals AHUs and exhaust units? Assume the ‘A’ FBEVIAS failed to receive the cross trip.

Answer 16

Still running dead headed, only ‘A’ FBEVIAS secures the normal air handlers.

Question 17

What is the purpose of the charcoal in the Fuel Building essential air filtration unit?

Answer 17

The charcoal adsorbs gaseous iodine prior to exhausting air to outside through fuel building exhaust plenum.

Question 18

What is the purpose of the heaters on the inlet of the Fuel Building Essentials?

Answer 18

Keep humidity <70% to allow the charcoal to operate at peak efficiency.

Question 19

Why aren’t the fuel building exhaust units equipped with filtration?

Answer 19

The exhaust plenum is monitored by RU monitors to detect any potential release of radioactivity. Activity detected above the set-point will actuate FBEVIAS, isolating the release.

Question 21

SIAS and FBEVIAS occur simultaneously. What mode are the Fuel Building essentials running in? What is the status of the Normal Fuel Building ventilation? Last, what will happen if the SIAS is cleared and reset?

Answer 21

Both Fuel Building Essentials will be running taking a suction on the of the Aux building, and the Fuel Building normals will be secured and isolated.
When the SIAS is reset, the suction dampers will realign to the Fuel Building.

Question 22

How many trains of PREACS are required to be operable?

Answer 22

2 trains of the Pump Room Essential Air Cleanup System are required to meet tech spec 3.7.13 requirements.