40EP-9EO11 Lower Mode Functional Recovery (LMFR)

Question 1

What are the entry conditions for LMFR?

Answer 1

• Mode 4-6, LTOP in svc, an EOP not in useAny of the following:- CRS says so- Lower mode SFSC not met- AOP or ARP says so- No procedure helps you

Question 2

What are the LMFR sets?

Answer 2

Set 1 PZR Manway on:- RCS intact- No opening meets LTOP (16 in2) or no RCS breach- RCGVS doesn’t count toward openingSet 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

Question 3

During LMFR which SFSC’s require no additional actions once met? (shaded paths)

Answer 3

Set 1:- RC-1 CEA insertion- MVAC-1 Off-site power- MVAC-2 DG power- CI-1 CNTMT isolation- CI-2 CNTMT closureSet 2:- RC-1 CEA insertion- MVAC-1 Off-site power- MVAC-2 DG power- PC-7 Manway off- CI-2 CNTMT ClosureSet 3:- MVAC-1 Off-site power- MVAC-2 DG power- PC-7 Manway off- CI-2 CNTMT Closure

Question 4

During LMFR what are the major steps of the Entry section (3.0)?

Answer 4

• 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

Question 5

During LMFR what are the major steps for a Dilution Accident?

Answer 5

• Stop all RCS additions- Chemistry sample boration source- Bypass LD IX- Eval dilution paths- LM-dilution flow path isolation if cant find source

Question 6

During LMFR when is the RWT considered “Limted”

Answer 6

• Level is less than expected or required for plant conditions

Question 7

During LMFR what are indications of and actions for SDC cavitation?

Answer 7

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

Question 8

What are the level requirements to use SI sump recirc?

Answer 8

• CNTMT sump level ≥ 54”- RWT ≤ 9.4%

Question 9

During LMFR when using HPSI for RCS make-up when would you use CL injection or HL injection?

Answer 9

CL injection:- SDC lost- Any CL manway removed- Nozzle dam NOT installed- HL not used, assumes water lost out HLHL Injection:- SDC lost- Any RCP impeller removed- RCP plug NOT installed- CL not used, RCP opening

Question 10

What are the gravity feed paths for RCS make-up?

Answer 10

• SDC suction lines via LPSI suction- HL injection via HPSI piping- CL injection via HPSI/ LPSI/ CS piping

Question 11

When using gravity feed for RCS make-up, what is the flow rate used?

Answer 11

• RWT level drops 3% every 15 minutes

Question 12

What temperature/ pressure requirements would you isolate seal injection prior to starting CH pump?

Answer 12

• > 150°F- >150 psi

Question 13

During LMFR what are the requirements to drain RFP deep ends back to the RWT?

Answer 13

• All F/A’s in the vessel or SFP- RWT available- Sump recirc not available or deireable- PC-118 closed

Question 14

During LMFR, what are the requirements to use “Controlled Steaming” for pressure control? (Set 1 PC-4)

Answer 14

• Used in conjunction with HR-1 (forced circ) or HR-3 (nat. circ)- Lpzr ≥ 10% [15]- Lsg ≥ 10% [15]

Question 15

During LMFR, what are the requirements if using RCGVS for pressure control (Set 1 PC-5)

Answer 15

• Lpzr <65% [64]- Vent to CNTMT preferred - A train to CNTMT (A to Air)- B train to RDT

Question 16

During LMFR when in Set 2 or 3 (manway off/ head removed) what is the only way for the RCS to become pressurized?

Answer 16

• Boiling occurs in the vessel head

Question 17

What are the level limits for SDC?

Answer 17

• ≤ 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

Question 18

What are the SDC flow limits?

Answer 18

• Mode 4: 4000 - 4750 gpm- Mode 5: 3780 - 4750 gpm<103’1” - 102’ - ≤ 4600 gpm<102’ - ≤ 4150 gpm

Question 19

When can LPSI pump be placed on SDC?

Answer 19

• Ppzr - <385 psia- Trcs - < 335°F

Question 20

When can CS be placed on SDC?

Answer 20

• Ppzr - <210 psia- Trcs - < 185°F

Question 21

What approximate RCS pressure is required to ensure proper Natural Circulation occurs if SG tubes are not filled?

Answer 21

≈ 130 psia [140]

Question 22

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?

Answer 22

• CL injection- ≈ 142 gpm- ≥ 100 gpm/ cold leg ensures > 142 gpm

Question 23

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?

Answer 23

• HL injection- ≥ 260 gpm

Question 24

In LMFR if using gravity feed, what initial throttle position do you set your gravity feed valve to?What targeted flow rate do establish?

Answer 24

• 30%- RWT level drops 3%/ 15 minutes

Question 25

In LMFR how is Gravity feed controlled:With CET’s?Without CET’s?

Answer 25

With CET:- < 10°F SuperheatWithout CET:- Compare RWT level drop to boil-off curves in SAOD

Question 26

During LMFR, when are Long Term Actions implemeted?

Answer 26

• After all selected success paths are complete- SFSC’s are satisfied

Question 27

What is the LOWEST pressure LTOPS are expected to lift?

Answer 27

• 410 psia [400]

Question 28

What is the minimum RCS level to operate SDC?

Answer 28

≥ 101’ 6”

Question 29

During LMFR, when you use CSP’s on SDC while at mid-loop?

Answer 29

• ONLY if LPSI is unavailable

Question 30

During LMFR, what limitation/ issue exists if cross tying NC to EW for cooling?

Answer 30

• Only provides NC flow to EW HX- EC HX is isolated- maintain NC > 80 psig- May be required to start second NC pump