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Systems > Isolation Condenser > Flashcards

Isolation Condenser Flashcards

1
Q

What is the purpose of the Isolation Condenser?

A

Core Decay Heat Removal following Reactor Isolation from Main Condenser and Reactor Scram.
Heat Removal capacity sufficient to remove decay heat at ~530seconds following Rx Scram

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2
Q

What is the available initial runtime and temp design of the Iso Condenser

A

Maintains shell <210F to ensure 20 minutes of sufficient cooling with no makeup (B3.5.3)

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3
Q

What power source is required for IC function?

A

Completely independent of AC power

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4
Q

How does IC associate with PRA?

A

PRA important operator action to initiate shell side makeup within 20 minutes to minimize core damage. Allows IC to function and conserve vessel inventory.

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5
Q

How quickly is IC shell makeup required to be aligned?

A

20 minutes

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6
Q

What is unique about IC pressure control function?

A

Allows for no Pressure Relief Valve inventory lost

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7
Q

How much heat removal is the IC capable of?

A

74MWth or 2.5-3%

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8
Q

Which IC valves are normally open? Closed?

A

1,2,4,17,20 NO

3NC

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9
Q

Where does IC discharge return to?

A

A recirc loop

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10
Q

Which IC valve is normally closed and what is its power source?

A

3 vlv - powered by RB 250vdc

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11
Q

What is the preferred order of IC Makeup water to shell side?

A

IC Makeup Pp
Clean Demin
Fire Main
Condensate Transfer

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12
Q

Where does IC drain to?

A

RBFDS - loop seal maintains secondary containment

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13
Q

What is the pressure rating of the IC?

A

1250psig because it is a primary system boundary

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14
Q

What must be done to IC if manways are open and IC drained?

A

Plates installed on vent pipes to maintain secondary containment

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15
Q

What powers the main valves?

A

1&4 - AC - norm 28-1/ alt 38-1

2&3 - DC - 250VDC RB Bus

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16
Q

How are the IC 1&4 valves swapped to alt power supply? What happens when this occurs and how can this be isolated?

A

Can be swapped from panel in 2/3 EDG room.
If this is done, MCR indication and control is lost and will not respond to Grp 5 isolation.
Panels in U2SDC and U3TIP used to isolate power to 2/3EDG IC panel in case of fire.

17
Q

What alarm is in if IC control swapped to alt power supply?

A

“ISOL CONDR VLVS OFF NORM”

18
Q

How is IC Vlv 3 operated on loss 250vdc?

A

manually - MOV - declutch

19
Q

What does the PTL position do to the IC 3 vlv?

A

PTL Position will override initiation signal and close the valve

20
Q

What is position of valves on initiation signal?

A

1,2,3,4 Open; 1,2,4 should be open already
17,20 close
3 vlv full open is really only 10% open

21
Q

Can the IC 3 vlv be throttled with an initiation signal present?

A

No It should not be throttled

22
Q

What causes a failure of the IC Vent Line Valves and what position do they fail to?

A

Loss of IB or IA - fail closed

23
Q

What are the positions of IC Vlvs on Grp 5 isolation?

A

All close, REGARDLESS OF CONTROL SWITCH POSITION

24
Q

What causes IC System Isolation?

A

De-energize to Actuate
Hi Steam or Condensate Flow (300%) causes isolation signal - all vlvs go closed
Loss of either DC logic Division causes isolation (either 2A-1 or 2B-1)

25
Q

What powers IC Logic?

A

Div I 2A-1; Div II 2B-1

26
Q

Which overrides the other: Initiation or Isolation?

A

ISOLATION TRUMPS INITIATION!!

27
Q

What shares the same penetrations as the IC?

A

U2: Return line shares with SDC into A RR Loop
U3: Suction connected at same penetation; RWCU must be secured before IC initiates to prevent cold water from IC thermally stressing RWCU suction piping

28
Q

What is automatic initiation signal for IC?

A

RPV Pressure for 1055psig for 12 seconds

29
Q

What signal is sent to 1,2,& 4 valves upon initiation?

A

No open signal sent….

30
Q

What happens on a IC Tube leak?

A

Shell Side Temp Increase
Shell Level Increase
Vent Rad Increase
Shell side vent loop seal maintains secondary containment

31
Q

What is the RPV Pressure Control Prefference?

A 
IC w/ IC Makeup Pps
IC w/ Clean Demin
HPCI in Press Control Mode
IC w/ Fire Water
ERVs
IC w/ Contaminated Demin
32
Q

What is the IC initation logic Scheme?

A 
De-energize to actuate:
Div 1 powered from 125vdc 2A-1
Div 2 powered from 125vdc 2B-1
Both divisions required to initiate
Loss of either causes isolation
33
Q

What is the difference of U2 to U3 IC Pressure sensing elements?

A

U2 is Elbow sensing on condensate return

U3 was replaced with Annubar flow elements - has time delay due to spurious signals from sensitive elements.

34
Q

What is required on an IC INOP CONDITION?

A

Must IMMEDIATELY verify HPCI available administratively for pressure control

35
Q

What provides make-up fuel fill to IC Make-up Pump Day tank?

A

U2 EDG Storage Tank - EDG INOP DURING FILL

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