E-3 Daily Quiz Flashcards
When does a tube leak become a tube rupture?
Greater than the capacity of one CCP
What are the primary to secondary leak rate limits?
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
How do you calculate primary leakage?
Charging - Letdown - Seal Leakoff
Define uncontrolled level rise in a SG?
Level continues to rise with all feedwater isolated
What are the limitation of the SG porv rad monitors for identifying a tube rupture?
PORV must be open to detect and will only detect high rad levels
What unique UFSAR assumption is taken into account for a tube rupture?
Operator Actions
How can a SGTR present a PTS concern?
Without RCPs running loop stagnation of cold ECCS water can occur
How does the lack of RCPs effect the concer for SG overfill?
Greater concern due to slower cooldown rate
Besides SG overfill what concerns exists during a SGTR while on Natural Circ?
PTS and Boron Dillution
What adverse condition come from SG overfill?
Damage to PORVs and SVs and TDAFP
Increased RAD release
Rupture Mainsteam lines from waterhammer or overfill
What must be done to terminate primary to secondary leakage during a SGTR?
Lower RCS pressure
Terminate SI
Entry conditions for E-3?
Abnormal secondary rad monitors
SG level rising in an uncontrolled manner
What is the basis for isolating the ruptured SG in E-3?
Allows intact SGs to be depressurized below ruptured SG pressure
What action must be taken if a Faulted SG is identified during E-3?
Go to E-2
What is the basis for Control Room Pressurization FOP criteria?
Ensure dose limits are not exceeded
What procedure transition must be made if SI reinitiation criteria are met during E-3?
Transition to ECA-3.1 due to concurrent LOCA event
What is the basis for the target temperature for the cooldown in E-3?
Provide a 20 degree subcooling margin when the RCS reaches ruptured SG pressure
What component is used to perform the maximum rate cooldown in E-3 during a LOOP?
Intact SG PORVs
During the maximum rate cooldown what must be done with the RCPs when RCS pressure reaches 1300 psig?
Leave them running due to cooldown being operator induced
What is the basis for checking subcooling >60 degrees following max rate cooldown in E-3?
Ensure LOCA is not occuring
What is the basis for maintaining ruptured SG level >13% in E-3 procedures?
Prevent steam from contacting SG tubes causing a rapid depressurization due to condensing steam
After terminating SI in E-3 what must be done if PRZ level is low and SG level is lowering?
Raise Charging flow
What must be done after SI terminated in E-3 if PRZ level is 50-72% and SG level is rising?
Lower Charging
Reduce pressure
What depressurization method is used with no RCPs with air restored to containment (Second depressurization)?
Aux Spray
How do you determine target temperature for max rate cooldown if multiple SGs are ruptured?
Use lowest SG pressure
State the three post SGTR recovery methods
Backfill - Preffered
Blowdown
Steam Dump - DRV-407
State the advantages and disadvantages of the backfill recovery method
+ Minimal rad release
+ Processing of contaminated water
- Slow
- Dilution to RCS
State the advantages and disadvantages of the blowdown recovery method
\+ Minimal rad release \+ Eliminates potential RCS dilution - Processing capabilities - Slow - Spread of contamination
State the advantages and disadvantages of the steam dump recovery method
+ Fastest
- Rad release
- Cannot perform if SG overfilled (95%)
What method is used to cool the ruptured SG?
Let level lower to 27% then refill to 62%
How is RCS leakage minimized during cooldown to 350 degrees using blowdown recovery method?
Using heaters, spray, and charging flow based on PRZ level to maintain SG level stable
How is SG level controlled during cooldown the backfill recovery method?
RCS pressure and AFW
Why do we verify SDM in ES-3.1 backfill recovery method?
Boration from RWST in E-3 and need to be ready for dilution from backfill
Why do we refill the ruptured SG during backfill if level lowers to 27%?
Potential rapid depressurization if tubes are uncovered
If offsite dose calcs are not acceptable for ES-3.2 what must be done?
Either ES-3.1 or ES-3.3
What is the SI termination criteria for PRZ level in E-3? What must be done if level requirements are not met?
16%
Loop back through E-3 to depressurize and refill
When should SDM be calculated while performing ES-3.1?
When concentration sample results are available
Why are PRZ heaters energized early in ES-3.1?
Saturate PRZ to limit drepressurization when sprays or PORVs are opened
After completing boration to cold shutdown what would be the cause of a rise in source range counts during ES-3.1 backfill?
Dilution from SG backfill
What type of events could cause transition to ECA-3.1?
SGTR with LOCA
Faulted/Ruptured SG
Unable to isolate ruptured SG from intact
Unable to maintain required DP
What procedure can you enter ECA-3.2 from?
ECA-3.1 SGTR with LOCA subcooled recovery
ECA-3.2 is with LOCA saturated probably forgot
How is RCS pressure controlled following SI termination in ECA-3.3 SGTR without pressure control?
Charging flow equal to letdown
What is done with RCS pressure following complete SI flow reduction in ECA-3.2 SGTR with LOCA saturated recovery?
Depressurize to saturation to minimize primary to secondary leakage
What will cause the use of ECA-3.2 SGTR with LOCA Saturated recovery?
First 13 steps complete of ECA-3.1 and RWST level vs containment level from table
Why doesn’t ECA-3.3 SGTR recovery without pressure control include PRZ level or RCS pressure on its SI termination criteria?
Not expected to be on scale and if it was it will lower when SI is terminated
In ECA-3.3 SGTR recovery without pressure control attempts to restore pressure control will continue until what one of two conditions terminates SI?
PRZ level on scale
Ruptured SG approaching overfill
How is primary to secondary leakage stopped in ECA-3.3?
Terminating SI and letting the RCS depressurize through the ruptured SG
What is required for natural circ verification?
TCold at Saturation for SG pressure CETC stable of lowering RCS pressure stable of lowering THot stable of lowering Subcooling
Why must AFW be initiated slowly to refill ruptured SG?
Cold AFW condensing steam and causing rapid depressurization
While performing cooldown to 350 degrees in ECA-3.3 why is charging flow controlled to maintain subcooling rather that PRZ level?
Raising charging flow to bring level on scale will raise leak rate
What is the fastest method to cooldown to 350 degrees in ECA-3.3?
Steam Dumps
When evaluating when to stop or realign the next peice of ECCS equipment during SI flow redution what is considered?
RCS pressure and Subcooling
How much subcooling is required to realign the last charging pump from the BIT header in ECA-3.1?
49 Degrees
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?
E-0
E-2
E-3
ECA-3.1
UFSAR assumptions for a SGTR?
~700gpm
Single Tube
LOOP
