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4. EOPs > E-3 Daily Quiz > Flashcards

E-3 Daily Quiz Flashcards

1
Q

When does a tube leak become a tube rupture?

A

Greater than the capacity of one CCP

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2
Q

What are the primary to secondary leak rate limits?

A 
75 gpd mode 3 in 24 hours
150 gpm mode 3 in 6 hours
75 gpd w/ 30gpd rise
-be less than 50% in one hour
-be in mode 3 in two hours
50 gpm RX trip
100 gpm RX trip and SI
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3
Q

How do you calculate primary leakage?

A

Charging - Letdown - Seal Leakoff

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4
Q

Define uncontrolled level rise in a SG?

A

Level continues to rise with all feedwater isolated

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5
Q

What are the limitation of the SG porv rad monitors for identifying a tube rupture?

A

PORV must be open to detect and will only detect high rad levels

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6
Q

What unique UFSAR assumption is taken into account for a tube rupture?

A

Operator Actions

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7
Q

How can a SGTR present a PTS concern?

A

Without RCPs running loop stagnation of cold ECCS water can occur

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8
Q

How does the lack of RCPs effect the concer for SG overfill?

A

Greater concern due to slower cooldown rate

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9
Q

Besides SG overfill what concerns exists during a SGTR while on Natural Circ?

A

PTS and Boron Dillution

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10
Q

What adverse condition come from SG overfill?

A

Damage to PORVs and SVs and TDAFP
Increased RAD release
Rupture Mainsteam lines from waterhammer or overfill

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11
Q

What must be done to terminate primary to secondary leakage during a SGTR?

A

Lower RCS pressure

Terminate SI

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12
Q

Entry conditions for E-3?

A

Abnormal secondary rad monitors

SG level rising in an uncontrolled manner

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13
Q

What is the basis for isolating the ruptured SG in E-3?

A

Allows intact SGs to be depressurized below ruptured SG pressure

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14
Q

What action must be taken if a Faulted SG is identified during E-3?

A

Go to E-2

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15
Q

What is the basis for Control Room Pressurization FOP criteria?

A

Ensure dose limits are not exceeded

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16
Q

What procedure transition must be made if SI reinitiation criteria are met during E-3?

A

Transition to ECA-3.1 due to concurrent LOCA event

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17
Q

What is the basis for the target temperature for the cooldown in E-3?

A

Provide a 20 degree subcooling margin when the RCS reaches ruptured SG pressure

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18
Q

What component is used to perform the maximum rate cooldown in E-3 during a LOOP?

A

Intact SG PORVs

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19
Q

During the maximum rate cooldown what must be done with the RCPs when RCS pressure reaches 1300 psig?

A

Leave them running due to cooldown being operator induced

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20
Q

What is the basis for checking subcooling >60 degrees following max rate cooldown in E-3?

A

Ensure LOCA is not occuring

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21
Q

What is the basis for maintaining ruptured SG level >13% in E-3 procedures?

A

Prevent steam from contacting SG tubes causing a rapid depressurization due to condensing steam

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22
Q

After terminating SI in E-3 what must be done if PRZ level is low and SG level is lowering?

A

Raise Charging flow

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23
Q

What must be done after SI terminated in E-3 if PRZ level is 50-72% and SG level is rising?

A

Lower Charging

Reduce pressure

24
Q

What depressurization method is used with no RCPs with air restored to containment (Second depressurization)?

A

Aux Spray

25
Q

How do you determine target temperature for max rate cooldown if multiple SGs are ruptured?

A

Use lowest SG pressure

26
Q

State the three post SGTR recovery methods

A

Backfill - Preffered
Blowdown
Steam Dump - DRV-407

27
Q

State the advantages and disadvantages of the backfill recovery method

A

+ Minimal rad release
+ Processing of contaminated water
- Slow
- Dilution to RCS

28
Q

State the advantages and disadvantages of the blowdown recovery method

A 
\+ Minimal rad release
\+ Eliminates potential RCS dilution
- Processing capabilities
- Slow
- Spread of contamination
29
Q

State the advantages and disadvantages of the steam dump recovery method

A

+ Fastest

  • Rad release
  • Cannot perform if SG overfilled (95%)
30
Q

What method is used to cool the ruptured SG?

A

Let level lower to 27% then refill to 62%

31
Q

How is RCS leakage minimized during cooldown to 350 degrees using blowdown recovery method?

A

Using heaters, spray, and charging flow based on PRZ level to maintain SG level stable

32
Q

How is SG level controlled during cooldown the backfill recovery method?

A

RCS pressure and AFW

33
Q

Why do we verify SDM in ES-3.1 backfill recovery method?

A

Boration from RWST in E-3 and need to be ready for dilution from backfill

34
Q

Why do we refill the ruptured SG during backfill if level lowers to 27%?

A

Potential rapid depressurization if tubes are uncovered

35
Q

If offsite dose calcs are not acceptable for ES-3.2 what must be done?

A

Either ES-3.1 or ES-3.3

36
Q

What is the SI termination criteria for PRZ level in E-3? What must be done if level requirements are not met?

A

16%

Loop back through E-3 to depressurize and refill

37
Q

When should SDM be calculated while performing ES-3.1?

A

When concentration sample results are available

38
Q

Why are PRZ heaters energized early in ES-3.1?

A

Saturate PRZ to limit drepressurization when sprays or PORVs are opened

39
Q

After completing boration to cold shutdown what would be the cause of a rise in source range counts during ES-3.1 backfill?

A

Dilution from SG backfill

40
Q

What type of events could cause transition to ECA-3.1?

A

SGTR with LOCA
Faulted/Ruptured SG
Unable to isolate ruptured SG from intact
Unable to maintain required DP

41
Q

What procedure can you enter ECA-3.2 from?

A

ECA-3.1 SGTR with LOCA subcooled recovery

ECA-3.2 is with LOCA saturated probably forgot

42
Q

How is RCS pressure controlled following SI termination in ECA-3.3 SGTR without pressure control?

A

Charging flow equal to letdown

43
Q

What is done with RCS pressure following complete SI flow reduction in ECA-3.2 SGTR with LOCA saturated recovery?

A

Depressurize to saturation to minimize primary to secondary leakage

44
Q

What will cause the use of ECA-3.2 SGTR with LOCA Saturated recovery?

A

First 13 steps complete of ECA-3.1 and RWST level vs containment level from table

45
Q

Why doesn’t ECA-3.3 SGTR recovery without pressure control include PRZ level or RCS pressure on its SI termination criteria?

A

Not expected to be on scale and if it was it will lower when SI is terminated

46
Q

In ECA-3.3 SGTR recovery without pressure control attempts to restore pressure control will continue until what one of two conditions terminates SI?

A

PRZ level on scale

Ruptured SG approaching overfill

47
Q

How is primary to secondary leakage stopped in ECA-3.3?

A

Terminating SI and letting the RCS depressurize through the ruptured SG

48
Q

What is required for natural circ verification?

A 
TCold at Saturation for SG pressure
CETC stable of lowering
RCS pressure stable of lowering
THot stable of lowering
Subcooling
49
Q

Why must AFW be initiated slowly to refill ruptured SG?

A

Cold AFW condensing steam and causing rapid depressurization

50
Q

While performing cooldown to 350 degrees in ECA-3.3 why is charging flow controlled to maintain subcooling rather that PRZ level?

A

Raising charging flow to bring level on scale will raise leak rate

51
Q

What is the fastest method to cooldown to 350 degrees in ECA-3.3?

A

Steam Dumps

52
Q

When evaluating when to stop or realign the next peice of ECCS equipment during SI flow redution what is considered?

A

RCS pressure and Subcooling

53
Q

How much subcooling is required to realign the last charging pump from the BIT header in ECA-3.1?

A

49 Degrees

54
Q

While performing E-0 there is a faulted SG inside containment and there are high rad levels inside containment and high activity in the faulted SG. What is the procedure flowpath?

A

E-0
E-2
E-3
ECA-3.1

55
Q

UFSAR assumptions for a SGTR?

A

~700gpm
Single Tube
LOOP

4. EOPs (10 decks)

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