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

Question 1

What are the entry conditions for LMFR?

Answer 1

• 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

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 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

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 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

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 HL

HL 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?

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 Superheat

Without 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

• NC flow is < EW flow
• EC is inoperable, but functional
• maintain NC > 80 psig
• May be required to start second NC pump