Ice Condenser

Question 1

Main Purpose of Ice Condenser

Answer 1

Limit peak pressure in containment following a DBA, LOCA, or a stem line break.

6-12 psig initial falling to 3-7 psig at 2 min

Question 2

Ice Condenser Flowpath

Answer 2

Lower Containment, Lower Plenum, Ice bed section, Upper Plenum, Upper Containment, either drains to sump or air recirculated to lower containment by CEQ fans.

Question 3

Lower Plenum Contains?

Answer 3

turning vanes (directs air evenly across ice beds) and floor drains (direct melted ice to the recirc sump)

Question 4

Ice Bed Section

Answer 4

Contains ice bed, lattice frame, support structure and ice baskets.

Question 5

how many ice baskets at what temperature

Answer 5

1944 baskets, 96 degrees indicated on SG-7

Question 6

Upper Plenum

Answer 6

Separates ice bed from upper containment and provides a passage for air to keep ice bed 15 degrees.

Intermediated deck doors lay closed on top of ice bed

Question 7

Does cold air flow across ice

Answer 7

no: air handling units circulate cold air in upper plenum down both walls of condenser and back.

Question 8

how does heat from the air handling units get removed?

Answer 8

glycol flows 6gpm to the air handlers around -5F inlet temp to keep air flow at 15cfm and 10F

Question 9

Air handler defrost cycle

Answer 9

fans and glycol supply shut off, defrost drain and pan energized to ensure draining, outlet backdraft damper closes due to distribution duct back pressure.

Question 10

air handler components

Answer 10

30 handlers with (2 fans and a glycol heat exchanger) each. electric heaters on all packages

Question 11

What is sublimation

Answer 11

Solid to a gas

Question 12

How does sublimation effect the ice condenser

Answer 12

Ice sublimates to a vapor and deposits elsewhere in the condenser.

frost forms on lattice and cooling walls

causes loss of water content of ice

Question 13

Purpose of glycol expansion tank

Answer 13

provides expansion volume for glycol on containment return header

Question 14

where does the glycol expansion tank overflow to

Answer 14

CWHUT via the ice condenser fan cooler unit drain pot

Question 15

what isolates containment glycol

Answer 15

Phase A and Lo-Lo level on expansion tank

Question 16

what closes on phase A

Answer 16

CIV’s VCR-(10,11,21,20)

Question 17

what closes on lo-lo expansion tank

Answer 17

VCR-20, VSO-(20,21)

Question 18

Expanding glycol tank level indicates

Answer 18

increasing return temp
containment civ closure
glycol header crosstie

Question 19

times on condenser air cycle in run

Answer 19

40 min, AHU’s in defrost
5 min, the 4 AHU’s fans are off. (no indicating lights)
5 min, with all AHU’s in run

Question 20

What should you do when isolating an air handler package

Answer 20

vent both air handler units

Question 21

chiller package alarms and trips

Answer 21

High refrigerant pressure
low refrigerant pressure
compressor overload 
low water flow
freeze protection

Question 22

Pump trips

Answer 22

low header pressure of 95 psig

Question 23

glycol effects/ first aid: swollowing

Answer 23

brain, kidney, liver damage (potentially fatal)

induce vomiting, call dr, get to emergency facility

Question 24

glycol effects/ first aid: eye contact

Answer 24

may cause minor eye irritation

irrigatethe eye immdiately for 5 min

Question 25

glycol effects inhalation

Answer 25

narcosis, nausea, and vomiting.