40EP-9EO11 Lower Mode Functional Recovery (LMFR) COPY Flashcards
What are the entry conditions for LMFR?
- Mode 4-6, LTOP in svc, an EOP not in use
Any of the following:
- CRS says so
- Lower mode SFSC not met
- AOP or ARP says so
- No procedure helps you
What are the LMFR sets?
Set 1 PZR Manway on:
- RCS intact
- No opening meets LTOP (16 in2) or no RCS breach
- RCGVS doesn’t count toward opening
Set 2 PZR Manway off:
- RCS not intact
- Opening meeting LTOP req’t (16 in2)
Set 3 Vessel Head Removed:
- Not correct if head is just de-tensioned
- No flow restriction for gravity feed/ once through
During LMFR which SFSC’s require no additional actions once met? (shaded paths)
Set 1:
- RC-1 CEA insertion
- MVAC-1 Off-site power
- MVAC-2 DG power
- CI-1 CNTMT isolation
- CI-2 CNTMT closure
Set 2:
- RC-1 CEA insertion
- MVAC-1 Off-site power
- MVAC-2 DG power
- PC-7 Manway off
- CI-2 CNTMT Closure
Set 3:
- MVAC-1 Off-site power
- MVAC-2 DG power
- PC-7 Manway off
- CI-2 CNTMT Closure
During LMFR what are the major steps of the Entry section (3.0)?
- Evaluate/ implement CTNMT closure
- IF RCP on stop seal AND loss inventory notify maintenance to install shaft block
- Stop core alts, place F/A in safe position
- Monitor RCP trip criteria
- Perform LMFR set
- FLEX bro
During LMFR what are the major steps for a Dilution Accident?
- Stop all RCS additions
- Chemistry sample boration source
- Bypass LD IX
- Eval dilution paths
- LM-dilution flow path isolation if cant find source
During LMFR when is the RWT considered “Limted”
- Level is less than expected or required for plant conditions
During LMFR what are indications of and actions for SDC cavitation?
SDC pump flow OR amps oscillations < 1 minute intervals
- If 2 pumps in svc, stop 1
- Reduce flow to 3780 gpm
- Stop affected pump go back to HR success path
- Ensure Inventory control is adequately addressed BEFORE leaving this path, it may hamper HR restoration
What are the level requirements to use SI sump recirc?
- CNTMT sump level ≥ 54”
- RWT ≤ 9.4%
During LMFR when using HPSI for RCS make-up when would you use CL injection or HL injection?
CL injection:
- SDC lost
- Any CL manway removed
- Nozzle dam NOT installed
- HL not used, assumes water lost out HL
HL Injection:
- SDC lost
- Any RCP impeller removed
- RCP plug NOT installed
- CL not used, RCP opening
What are the gravity feed paths for RCS make-up?
- SDC suction lines via LPSI suction
- HL injection via HPSI piping
- CL injection via HPSI/ LPSI/ CS piping
When using gravity feed for RCS make-up, what is the flow rate used?
- RWT level drops 3% every 15 minutes
What temperature/ pressure requirements would you isolate seal injection prior to starting CH pump?
- > 150°F
- >150 psi
During LMFR what are the requirements to drain RFP deep ends back to the RWT?
- All F/A’s in the vessel or SFP
- RWT available
- Sump recirc not available or deireable
- PC-118 closed
During LMFR, what are the requirements to use “Controlled Steaming” for pressure control? (Set 1 PC-4)
- Used in conjunction with HR-1 (forced circ) or HR-3 (nat. circ)
- Lpzr ≥ 10% [15]
- Lsg ≥ 10% [15]
During LMFR, what are the requirements if using RCGVS for pressure control (Set 1 PC-5)
- Lpzr <65% [64]
- Vent to CNTMT preferred
- A train to CNTMT (A to Air)
- B train to RDT
During LMFR when in Set 2 or 3 (manway off/ head removed) what is the only way for the RCS to become pressurized?
- Boiling occurs in the vessel head
What are the level limits for SDC?
- ≤ 107’ 6” SDC running in parallel STOP 1 pump
- ≤ 104’ 6” SDC running on opposite trains STOP 1 pump
- ≤ 101’ 4” stop ALL SDC pumps
What are the SDC flow limits?
- Mode 4: 4000 - 4750 gpm
- Mode 5: 3780 - 4750 gpm
<103’1” - 102’ - ≤ 4600 gpm
<102’ - ≤ 4150 gpm
When can LPSI pump be placed on SDC?
- Ppzr - <385 psia
- Trcs - < 335°F
When can CS be placed on SDC?
- Ppzr - <210 psia
- Trcs - < 185°F
What approximate RCS pressure is required to ensure proper Natural Circulation occurs?
≈ 130 psia [140]
In LMFR in HR-5 (SG cold leg manway removed, no nozzle dam Set 2 only):
Where do you align make-up injection?
What is the minimum make-up flow rate?
How do we ensure minimum flow?
- CL injection
- ≈ 142 gpm
- ≥ 100 gpm/ cold leg ensures > 142 gpm
In LMFR during HR-6 (RCP impeller removed, no plug Set 2 ONLY):
Where do you align make-up injection?
What flow rate is used?
- HL injection
- ≥ 260 gpm
In LMFR if using gravity feed, what initial throttle position do you set your gravity feed valve to?
What targeted flow rate do establish?
- 30%
- RWT level drops 3%/ 15 minutes
In LMFR how is Gravity feed controlled:
With CET’s?
Without CET’s?
With CET:
- < 10°F Superheat
Without CET:
- Compare RWT level drop to boil-off curves in SAOD
During LMFR, when are Long Term Actions implemeted?
- After all selected success paths are complete
- SFSC’s are satisfied
What is the LOWEST pressure LTOPS are expected to lift?
- 410 psia [400]
What is the minimum RCS level to operate SDC?
≥ 101’ 6”
During LMFR, when you use CSP’s on SDC while at mid-loop?
- ONLY if LPSI is unavailable
During LMFR, what limitation/ issue exists if cross tying NC to EW for cooling?
- NC flow is < EW flow
- EC is inoperable, but functional
- maintain NC > 80 psig
- May be required to start second NC pump
