Boric Acid Concentrator (BAC)

Question 1

The BAC CONC TRBL alarms in the control room…

Answer 1

…with no time delay.

Question 2

The BAC HUT alarm set points are…

Answer 2

hi-hi level alarm at 42’
high level alarm at 17’
low level alarm at 4’
low-low level alarm at 28” (HUT pump trip)

Question 3

When in the normal position, which signals will stop the holdup pump:

Answer 3

• Lo-lo holdup tank level (28”)
• Hi-Hi boric acid concentrator flash tank level.
• Other holdup tank pump starts.
• Diversion of letdown flow CH-500 to the pre-holdup ion exchanger when the holdup tank contents are being re-purified (CH-V686 open).
• Electrical protection or loss of control power.

Question 4

A BAC steam vapor release to __(1)__ and requires a __(2)__ due to __(3)__

Answer 4

(1) the plant vent
(2) a Radioactive Effluents Discharge Permit
(3) Steam vapor contains tritium as part of the water molecule

Question 5

What cools the BAC concentrates?

Answer 5

NC - Nuclear Cooling Water