ML13198A456
| ML13198A456 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/14/2013 |
| From: | Reed D Southern Co, Southern Nuclear Operating Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NL-13-1257 FNP-1-ESP-0.2, Rev 19 | |
| Download: ML13198A456 (51) | |
Text
611412013 13:57 UNIT 1 FARLEY NUCLEAR PLANT EVENT SPECIFIC PROCEDURE FNP-1-ESP-0.2 to NL-13-1257 FNP-1-ESP-0.2 6-29-2010 Revision 19 NATURAL CIRCULATION COOLDOWN TO PREVENT REACTOR VESSEL HEAD STEAM VOIDING PROCEDURE USAGE Continuous Use Reference Use Information Use Approved:
David L. Reed(for)
Operations Manager REQUIREMENTS-per FNP-0-AP-6 SECTIONS ALL Date Issued: 01 / 11 / 11 S
A F
E T
Y R
E L
A T
E D
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NATURAL CIRCULATION i OOLDOWN T! PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING TABLE OF CONTENTS Procedure Contains Number of Pages Body.................................. 40 Figure 1............................... 1 Figure 2............................... 1 Figure 3............................... 1 Figure 4............................... 1 Figure 5............................... 1........................... 1........................... 1........................... 1 Foldout Page........................... 1 Page 1 of 1 Revision 19
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 A.
Purpose VESSEL HEAD STEAM VOIDING Revision 19 This procedure provides actions to perform a natural circulation RCS cooldown and depressurization to cold shutdown, with no accident in progress, under requirements that will preclude any upper head void formation and flow stagnation in an inactive loop.
B.
Symptoms or Entry Conditions I.
This procedure is entered when it has been determined that a natural circulation cooldown is required; from the following:
- a.
FNP-1-ESP-0.1, REACTOR TRIP RESPONSE, step 19
- b.
FNP-1-ECP-0.1, LOSS OF ALL AC POWER RECOVERY WITHOUT SI REQUIRED, step 22
- c.
FNP-1-ESP-1.1, SI TERMINATION, step 35
- d.
FNP-1-AOP-4.0, LOSS OF REACTOR COOLANT FLOW, STEP 16 Page 1 of 40
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CIRCULATION {~&O~N T~ PREVENT VESSEL HEAD STEAM VOIDING 611412013 13:57 FNP-1-ESP-0.2 NATURAL REACTOR Revision 19 Step Action/Expected Response Response NOT Obtained II CAUTION:
[CAl To ensure proper plant response. FNP-1-EEP-0. REACTOR TRIP OR SAFETY INJECTION. must be entered upon any SI actuation.
CAUTION:
If RCP seal cooling had previously been lost. the affected RCP should not be started prior to a status evaluation.
NOTE:
- Foldout page should be monitored continuously.
1
- To ensure adequate pressurizer spray. the priority for establishing RCP support conditions is lB. 1A and then 1C.
- If conditions can be established for starting an RCP while in this procedure. step 1 should be repeated.
[CAl Establish RCP support conditions.
CAUTION:
To prevent heat exchanger damage. do not attempt restoration of RCP seal return flow unless the CCW miscellaneous header is aligned to an operating CCW loop.
1.1 Verify CCW cooling -
ESTABLISHED 1.1.1 Verify miscellaneous header aligned.
CCW TO SECONDARY HXS
[] Q1P17MOV3047 open 1.1 Proceed to step 1.3.
Step 1 continued on next page.
Page 2 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II Action/Expected Response 1.1.2 Verify flow indicated in the On-Service train.
HX 1A(1B.1C)
CCW FLOW
[] FI 3043AA
[] FI 3043BA
[] FI 3043CA 1.2 Verify seal return flow -
ESTABLISHED.
[] Q1E21MOV8100 open
[] Q1E21MOV8112 open 1.3 Verify No.1 seal support conditions established.
1.3.1 Maintain seal injection flow - GREATER THAN 6 gpm.
1.3.2 Verify No.1 seal leakoff flow - WITHIN FIGURE 1 LIMITS.
1.3.3 Verify No.1 seal differential pressure -
GREATER THAN 200 psid.
1.4 Verify CCW - ALIGNED.
[] Q1P17HV3045 open
[] Q1P17HV3184 open 1.5 Check RCP thermal barrier -
INTACT.
[] Annunciator DD2 clear Response NOT Obtained 1.5 Verify CCW flow isolated.
[] Q1P17HV3045 closed
[] Q1P17HV3184 closed Step 1 continued on next page.
Page 3 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II Action/Expected Response I
1.6 Verify at least one RCP bus -
ENERGIZED.
[] 1A 4160 V bus
[] 1B 4160 V bus
[] 1C 4160 V bus 1.7 Check CCW to RCP oil coolers -
SUFFICIENT.
[] Annunciator DD3 clear 1.8 Check at least one RCP oil level - SUFFICIENT.
RCP 1A(lB.1C) BRG UPPER/LOWER OIL RES LO LVL
[] Annunciator HH1 clear
[] Annunciator HH2 clear
[] Annunciator HH3 clear 1.9 Check RCS pressure - GREATER THAN 1850 psig.
[] PI 402A
[] PI 403A I
Response NOT Obtained I
I 1.6 Proceed to step 1.10.
1.7 Perform the following.
1.7.1 Verify CCW - ALIGNED.
[] Q1P17MOV3052 open CCW FROM RCP OIL CLRS
[] Q1P17MOV3046 open
[] Q1P17MOV3182 open 1.7.2 II annunciator DD3 clear.
THEN proceed to step 1.8.
IF NOT proceed to step 1.10.
1.8 Proceed to step 1.10.
1.9 Check RCS within FIGURE 2 limits.
Step 1 continued on next page.
Page 4 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained NOTE:
Changes in RCP configuration may affect pressurizer spray flow.
1.10
[CA] II support conditions exist to start an RCP.
THEN start at least one RCP.
1.10.1 Start bearing oil lift pump.
RCP OIL LIFT PUMP
[] 1B(1A.1C) 1.10.2 Check oil lift pressure indicating light - LIT.
1.10.3 Start RCP.
[] 1B(1A.1C) 1.10.4 WHEN RCP has operated for one minute.
THEN stop bearing oil lift pump.
RCP OIL LIFT PUMP
[] 1B(1A.1C) 1.10 Verify adequate natural circulation.
a)
Check SG pressure stable or falling.
b)
Check SUB COOLED MARGIN MONITOR indication greater than 16°F subcooled in CETC mode.
c)
Check RCS hot leg temperatures stable or falling.
RCS HOT LEG TEMP
[] TR 413 d)
Check core exit T/Cs stable or falling.
e)
Check RCS cold leg temperatures at saturation temperature for SG pressure.
RCS COLD LEG TEMP
[] TR 410 NOTE:
Ensure a cooldown rate of 25°F/hr is not exceeded when performing this step.
f) II natural circulation NOT adequate.
THEN dump steam at a faster rate.
g)
Begin taking natural circulation logs.
Step 1 continued on next page.
Page 5 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Step II 2
Action/Expected Response 1.11
[CAl IT at least one RCP started.
THEN go to FNP-1-UOP-2.1.
SHUTDOWN OF UNIT FROM MINIMUM LOAD TO HOT STANDBY.
[CAl Establish adequate shutdown margin.
2.1 Determine cold shutdown boron concentration from the following.
[] Core Power History
[] Core Physics Curve 61
[] Core Physics Curve 61A 2.2 Determine required boron addition from either of the following.
[] Boron tables
[] FNP-1-S0P-2.3 nomographs Revision 19 Response NOT Obtained h)
Continue efforts to establish RCP support conditions.
i)
WHEN support conditions exist to start an RCP.
THEN return to Step 1.
j)
Proceed to Step 2.
Step 2 continued on next page.
Page 6 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Step II Action/Expected Response 2.3 Borate RCS to cold shutdown concentration.
2.3.1 Place makeup mode control switch to STOP.
MKUP MODE CONT SWITCH
[] N1E21HS2100P 2.3.2 Place makeup mode selector switch to BOR.
MKUP MODE SEL SWITCH
[] N1E21HS2100Q 2.3.3 Adjust boric acid makeup flow controller for desired flow.
BORIC ACID MKUP FLOW
[] FK 113 2.3.4 Adjust boric acid integrator for required quantity.
BORIC ACID BATCH INTEG
[] FIS 113 2.3.5 Place makeup mode control switch to START.
MKUP MODE CONT SWITCH
[] N1E21HS2100P red light lit 2.4 Direct Chemistry to sample RCS for boron concentration using FNP-1-CCP-651, SAMPLING THE REACTOR COOLANT SYSTEM.
2.3 Revision 19 Response NOT Obtained Emergency borate RCS to cold shutdown concentration.
a)
Open emergency boration valve.
EMERG BORATE TO CHG PUMP SUCT
[] Q1E21MOV8104 b)
Start a boric acid transfer pump.
BATP
[] 1A
[] 1B 2.5 Verify RCS boron concentration
- GREATER THAN OR EQUAL TO COLD SHUTDOWN CONCENTRATION.
2.5 Return to step 2.1.
Step 2 continued on next page.
Page 7 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Step II 3
Action/Expected Response 2.6 Align reactor makeup system as follows:
2.6.1 Adjust BORIC ACID MKUP FLOW FK 113 to deliver greater than required cold shutdown boron concentration.
2.6.2 Verify reactor makeup system - IN AUTOMATIC MODE.
MKUP MODE SEL SWITCH
[] NIE21HS2100Q in AUTO MKUP MODE CaNT SWITCH
[] NIE21HS2100P to START
[CAl Verify both CRDM CLG FANs
- STARTED.
Page 8 of 40 Revision 19 Response NOT Obtained
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response Response NOT Obtained II CAUTION:
RCS boron concentration must be verified to be greater than or equal to the required Cold Shutdown Boron Concentration prior to commencing a cooldown.
NOTE:
4 An inactive loop is any RCS loop that is not available for cooling the RCS due to a loss of the capability to feed or steam its SG.
Begin ReS cooldown to cold shutdown.
4.1 Check status of all SGs:
4.1 Perform the following:
- Steam release capabilities -
AVAILABLE
- Feed flow - AVAILABLE 4.1.1 II feedwater to inactive loop(s) NOT available.
THEN verify the following paths from inactive loop(s) isolated:
4.1.1.1 Verify at least one SG main steam isolation and bypass valve for inactive SG(s) - CLOSED Inactive SG lA IB lC lA(1B.IC) SG MSIV - TRIP
[] 3369A [] 3369B [] 3369C QINIIHV rl 3370A rl 3370B rl 3370C lA(1B.IC) SG MSIV BYPASS
[] 3368A [] 3368B [] 3368C QINIIHV
[] 3976A [] 3976B [] 3976C Step 4 continued on next page.
Page 9 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained 4.1.1.2 II 1B loop inactive, THEN isolate TDAFWP steam supply from 1B SG.
a) II TDAFWP NOT
- required, THEN isolate TDAFWP steam supply from 1B SG at hot shutdown panel.
[] Q1N12HV3235Ai26 in LOCAL (HSDP F)
[] Q1N12HV3235Ai26 to STOP (HSDP D) b) II TDAFWP required, THEN locally unlock and close STM LINE 1B TO TDAFWP ISO VLV Q1N12V006A. (Key Master Z)
(127 ft.
AUX BLDG MSVR)
Step 4 continued on next page.
Page 10 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained 4.1.1.3 II lC loop inactive.
SGBD ISO QIG24HV 4.1.1.5 THEN isolate TDAFWP steam supply from lC SG.
a)
Isolate TDAFWP steam supply from lC SG at hot shutdown panel.
[] QIN12HV3235B in LOCAL (HSDP F)
[] QIN12HV3235B to STOP (HSDP D) b)
Locally unlock and close STM LINE lC TO TDAFWP ISO VLV QINI2V005B. (Key Master Z)
(127 ft.
AUX BLDG MSVR)
Verify blowdown from inactive SG(s) -
ISOLATED lA IB lC
[] 7614A [] 7614B [] 7614C CLOSED CLOSED CLOSED Check inactive SG(s) atmospheric relief valves - CLOSED Inactive SG lA IB lC lA(1B.IC) MS ATMOS REL VLV PC
[] 33 71A
[] 33 71B
[] 33 71C Step 4 continued on next page.
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II Action/Expected Response 4.2
[CA] Maintain RCS cold leg cooldown rate - LESS THAN 25°F/hr.
RCS COLD LEG TEMP
[] TR 410 Response NOT Obtained 4.1.2 Maintain cooldown rate in RCS cold legs less than maximum allowable limits of FIGURE 5.
4.1.3 Go to step 4.3.
Step 4 continued on next page.
Page 12 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response Response NOT Obtained II CAUTION:
SI due to steam line differential pressure may result from unbalanced heat removal from different loops.
NOTE:
- The steam dumps will be interlocked closed when RCS TAVG reaches P-12 (543°F).
This interlock may be bypassed for A and E steam dumps with the STM DUMP INTERLOCK switches.
- Excessive opening of steam dumps can cause a high steam flow LO-LO TAVG main steam line isolation signal.
4.3 II condenser available.
4.3 Dump steam to atmosphere from active SGs.
THEN dump steam to condenser from active SGs.
BYP & PERMISSIVE COND AVAIL
[] C-9 status light lit STM DUMP
[] MODE SEL A-B TRN in STM PRESS STM DUMP INTERLOCK
[] A TRN in ON
[] PK 464 adjusted 4.3.1 Direct counting room to perform FNP-0-CCP-64S. MAIN STEAM ABNORMAL ENVIRONMENTAL RELEASE.
4.3.2 II normal air available.
THEN control atmospheric relief valves to dump steam.
IF NOT. dump steam using FNP-1-S0P-62.0. EMERGENCY AIR SYSTEM.
1A(lB.1C) MS ATMOS REL VLV
[] PC 3371A adjusted
[] PC 3371B adjusted
[] PC 3371C adjusted Step 4 continued on next page.
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II Action/Expected Response 4.4 Monitor CST level.
4.4.1 Check CST level greater than 5.3 ft.
CST LVL
[] LI 4132A
[] LI 4132B 4.4.2 Verify makeup is aligned to the CST from water treatment plant (Ionics Trailer) using FNP-1-S0P-21.0.
CONDENSATE AND FEEDWATER SYSTEM. OR demin water system using FNP-1-S0P-s.0.
DEMINERALIZED MAKEUP WATER SYSTEM. as necessary.
Response NOT Obtained 4.4.1 Align AFW pumps suction to SW using FNP-1-S0P-22.0.
AUXILIARY FEEDWATER SYSTEM.
4.4.2 II inventory available in the hotwell.
THEN align condensate dump flow to fill the CST.
4.4.2.1 Verify at least one CNDS PUMP - STARTED.
4.4.2.2 Verify condensate dump valve manual isolation valves open.
(137 ft. TURB BLDG)
[] N1N21Vs30
[] N1N21V927 4.4.2.3 Adjust open condensate dump valve.
(137 ft. TURB BLDG)
CNDS EMER DUMP
[] N1N21V904 Step 4 continued on next page.
Page 14 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Step II Action/Expected Response 4.5
[CA] Maintain SG narrow range levels approximately 65%.
4.5.1 Control MDAFWP flow.
[] A TRN reset
[] B TRN reset MDAFWP TO lA!IB/IC SG B TRN
[] FCV 3227 in MOD MDAFWP TO lA(1B.IC) SG
[] QIN23HV3227A in MOD
[] QIN23HV3227B in MOD
[] QIN23HV3227C in MOD MDAFWP TO lA(IB.IC)
FLOW CONT
[] HIC 3227AA adjusted
[] HIC 3227BA adjusted
[] HIC 3227CA adjusted 4.5.2 Control TDAFWP flow.
TDAFWP FCV 3228
[] RESET reset TDAFWP SPEED CONT
[] SIC 3405 adjusted TDAFWP TO lA(1B.IC) SG
[] QIN23HV3228A in MOD
[] QIN23HV3228B in MOD
[] QIN23HV3228C in MOD TDAFWP TO lA(IB.IC)
SG FLOW CONT
[] HIC 3228AA adjusted
[] HIC 3228BA adjusted
[] HIC 3228CA adjusted SG Revision 19 Response NOT Obtained Step 4 continued on next page.
Page 15 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II
_5 Action/Expected Response 4.6 II both CRDM CLG FANs started.
THEN maintain RCS cold leg temperature and pressure within limits of FIGURE 3.
RCS COLD LEG TEMP
[] TR 410 1C (lA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A
[CAl Monitor for Inactive Loop(s) Stagnation Condition:
5.1 Check RCS loops - ANY INACTIVE 5.2 Verify cooldown rate in RCS cold legs - LESS THAN MAXIMUM ALLOWABLE LIMITS OF FIGURE 5.
5.3 Monitor RCS hot leg temperatures - ALL DECREASING AT SAME RATE RCS HOT LEG TEMP
[] TR 413 Response NOT Obtained 4.6 Maintain RCS cold leg temperature and pressure within limits of FIGURE 4.
RCS COLD LEG TEMP
[] TR 410 1C (lA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A 5.1 Proceed to step 6.
5.3 Perform the following:
5.3.1 Reduce cooldown rate by a factor of two.
Step 5 continued on next page.
Page 16 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained 5.3.2 Reduce inactive loop(s) SG pressure to within 100 psig of active loop(s) SG pressure:
Inactive SG 1A(1B.1C) SG MSIV BYPASS Q1N11HV
- II normal air available.
THEN control atmospheric relief valves to dump steam from inactive SG (s).
IF NOT. dump steam using FNP-1-S0P-62.0. EMERGENCY AIR SYSTEM.
1A(lB.1C) MS ATMOS REL VLV
[] PC 3371A adjusted
[] PC 3371B adjusted
[] PC 3371C adjusted
- Open at least one SG main steam bypass valve for inactive SG(s).
1A 1B 1C
[] 3368A [] 3368B [] 3368C
[] 3976A [] 3976B [] 3976C Step 5 continued on next page.
Page 17 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Action/Expected Response Revision 19 Response NOT Obtained
- Open steam supply valve(s) to TDAFWP from inactive loop(s).
a) II IB loop stagnant.
THEN open TDAFWP steam supply from IB SG.
- 1) II previously closed.
THEN. locally open STM LINE IB TO TDAFWP ISO VLV QINI2V006A.
(Key Ma s t e r Z )
(12 7 ft. AUX BLDG main steam valve room)
- 2)
Restore MCB control of TDAFWP steam supply from IB SG.
[] QIN12HV3235Ai26 in REMOTE (HSDP-F)
- 3)
Start the TDAFWP from the main control board.
[] QIN12HV3235Ai26 -
START TDAFW SPEED CONT
[] SIC 3405 adjusted as required Step 5 continued on next page.
Page 18 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained Step 5 continued on next page.
Page 19 of 40 b) II lC loop stagnant.
THEN open TDAFWP steam supply from lC SG.
- 1) II previously closed.
THEN locally open STM LINE lC TO TDAFWP ISO VLV QINI2V005B.
(Key Ma s t e r Z ) (12 7 ft. AUX BLDG main steam valve room)
- 2)
Restore MCB control of TDAFWP steam supply from lC SG.
[] QIN12HV3235B in REMOTE (HSDP-F)
- 3)
Start the TDAFWP from the main control board.
TDAFWP STM SUPP FROM IB (1C) SG
[] QIN12HV3235Ai26 -
START
[] QIN12HV3235B -
START TDAFW SPEED CONT
[] SIC 3405 adjusted as required
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II 6
Action/Expected Response Check RCS hot leg temperatures
- LESS THAN 550°F.
RCS HOT LEG TEMP
[] TR 413 Page 20 of 40 6
Response NOT Obtained
- II feed flow established to inactive loop(s).
THEN establish blowdown per FNP-1-S0P-16.1. STEAM GENERATOR BLOWDOWN PROCESSING SYSTEM. to cool inactive loop(s).
5.3.3 Continue with step 6. WHEN inactive loop(s) hot leg temperature decreasing.
THEN perform the following:
5.3.3.1 Stop inactive loop(s) depressurization.
5.3.3.2 Slowly raise cooldown rate NOT to exceed maximum allowable limits of FIGURE 5.
Return to step 4.
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II 7
Action/Expected Response Reduce RCS pressure to approximately 1950 psig.
[] PI 402A
[] PI 403A Response NOT Obtained CAUTION:
To prevent heat exchanger damage. do not attempt restoration of letdown unless the CCW miscellaneous header is aligned to an operating CCW loop.
7.1 Check normal GREATER THAN LTDN HX OUTLET FLOW
[] FI 150 letdown flow -
o gpm.
7.1 Establish normal letdown.
7.1.1
[]
[]
[]
Open letdown valves.
LTDN LINE PENE RM ISO Q1E21HV8175A Q1E21HV8175B LTDN LINE CTMT ISO Q1E21HV8152 LTDN LINE ISO
[] Q1E21LCV459
[] Q1E21LCV460 isolation (PRIP)
(PRIP) 7.1.2 Manually adjust LP LTDN PRESS LTDN PK 145 to 50%
open.
7.1.3 Open letdown orifice isolation valve(s).
LTDN ORIF ISO 45 GPM
[] Q1E21HV8149A LTDN ORIF ISO 60 GPM
[] Q1E21HV8149B
[] Q1E21HV8149C Step 7 continued on next page.
Page 21 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II Action/Expected Response 7.2 II normal letdown established.
THEN control auxiliary spray for RCS pressure reduction as follows.
7.2.1 Manually open both normal pressurizer spray valves.
[] PK 444C
[] PK 444D 7.2.2 Open auxiliary spray valve.
RCS PRZR AUX SPRAY
[] Q1E21HV8145 7.2.3 Verify flow path - ALIGNED.
CHG FLOW
[] FK 122 manually open CHG PUMPS TO REGENERATIVE HX
[] Q1E21MOV8107 open
[] Q1E21MOV8108 open RCS NORMAL CHG LINE
[] Q1E21HV8146 closed RCS ALT CHG LINE
[] Q1E21HV8147 closed Response NOT Obtained 7.1.4 Manually adjust letdown pressure to 260-450 psig.
LP LTDN PRESS
[] PK 145 adjusted 7.1.5 Place LP LTDN PRESS PK 145 in AUTO.
7.2 II letdown can NOT be established.
THEN perform the following.
a)
Use one PORV for RCS pressure reduction.
b)
Go to Step 8.
OBSERVE CAUTION PRIOR TO STEP 8.
Step 7 continued on next page.
Page 22 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II I 7.2.4
[]
[]
[]
[]
[]
[]
VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained I
I WHEN RCS pressure reduction
- required, THEN operate the following valves as required to control pressurizer pressure.
CHG FLOW FK 122 manually open 1A(1B) LOOP SPRAY VLV PK 444C manually open/closed PK 444D manually open/closed RCS PRZR AUX SPRAY Q1E21HV8145 open/closed RCS NORMAL CHG LINE Q1E21HV8146 open/closed RCS ALT CHG LINE Q1E21HV8147 open/closed Page 23 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained CAUTION:
SI actuation circuits will automatically unblock if RCS average temperature rises to greater than 543°F or PRZR pressure rises to greater than 2000 psig.
8 Block low pressurizer pressure and low steam line pressure SI actuation signals.
8.1 WHEN P-12 light lit.
THEN perform the following.
8.1.1 Block low steam line pressure SI.
STM LINE PRESS SI BLOCK - RESET
[] A TRN to BLOCK
[] B TRN to BLOCK 8.1.2 Verify blocked indication.
BYP & PERMISSIVE STM LINE ISOL.
SAFETY INJ.
[] TRAIN A BLOCKED light lit
[] TRAIN B BLOCKED light lit 8.2 WHEN pressurizer pressure less than 2000 psig.
THEN perform the following:
8.2.1 Block low pressurizer pressure SI.
PRZR PRESS SI BLOCK - RESET
[] A TRN to BLOCK
[] B TRN to BLOCK 8.2.2 Verify blocked indication.
BYP & PERMISSIVE PRZR.
SAFETY INJECTION
[] TRAIN A BLOCKED light lit
[] TRAIN B BLOCKED light lit Page 24 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II 9
Action/Expected Response Maintain the following ReS conditions.
- Maintain RCS pressure -
approximately 1950 psig.
[] PI 402A
[] PI 403A
- Maintain pressurizer level -
approximately 22%.
- Maintain cooldown rate in RCS cold legs -
- LESS THAN 25°F/hr II ALL RCS LOOPS ACTIVE
- II both CRDM FANs started.
THEN maintain RCS cold leg temperature and pressure within limits of FIGURE 3.
RCS COLD LEG TEMP
[] TR 410 lC (IA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A Page 25 of 40 Response NOT Obtained
- Maintain RCS cold leg temperature and pressure within limits of FIGURE 4.
RCS COLD LEG TEMP
[] TR 410 lC (IA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II
_10 11
[CAl Monitor RCS cooldoWil.
- Check core exit T/C indication - FALLING.
- Check RCS hot leg temperatures - FALLING.
RCS HOT LEG TEMP
[] TR 413
- Check SUB COOLED MARGIN MONITOR indication -
SUB COOLING IN CETC MODE RISING.
[CAl Check CST level adequate to remain in FNP-1-ESP-O.2.
11.1
[CAl Using ATTACHMENT 3. check actual CST level above minimum required CST level for a 25° F /hr cooldown. (actual CST level above 25°F/hr line)
Page 26 of 40 Response NOT Obtained 11.1 Go to appropriate procedure:
11.1.1 II RVLIS available.
THEN go to FNP-I-ESP-0.3.
NATURAL CIRCULATION COOLDOWN WITH ALLOWANCE FOR REACTOR VESSEL HEAD STEAM VOIDING (WITH RVLIS).
11.1.2 II RVLIS NOT available.
THEN go to FNP-I-ESP-0.4.
NATURAL CIRCULATION COOLDOWN WITH ALLOWANCE FOR REACTOR VESSEL HEAD STEAM VOIDING (WITHOUT RVLIS).
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II 12 Begin ReS pressure reduction.
12.1 II both CRDM CLG FANs started.
THEN maintain SUB COOLED MARGIN MONITOR indication greater than 68°F SUB COOLED IN CETC mode.
Response NOT Obtained 12.1 Perform the following.
12.1.1 WHEN RCS hot leg temperature ~ 430°F.
THEN maintain RCS pressure 1900-1950 psig.
[] PI 402A
[] PI 403A 12.1.2 WHEN RCS hot leg temperature less than 430° F.
THEN maintain SUB COOLED MARGIN MONITOR indication greater than 212°F subcooled in CETC mode.
Step 12 continued on next page.
Page 27 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II 12.2 II normal letdown established.
THEN control auxiliary spray for any RCS pressure reduction. as follows.
12.2.1
[]
[]
12.2.2
[]
12.2.3
[]
[]
[]
[]
Manually open both normal pressurizer spray valves.
1A(1B) LOOP SPRAY VLV PK 444C PK 444D Open auxiliary spray valve.
RCS PRZR AUX SPRAY Q1E21HV8145 Verify flow path - ALIGNED.
CHG FLOW FK 122 manually open CHG PUMPS TO REGENERATIVE Q1E21MOV8107 Q1E21MOV8108 RCS NORMAL CHG LINE Q1E21HV8146 RCS ALT CHG LINE HX open open closed
[] Q1E21HV8147 closed Response NOT Obtained 12.2 WHEN RCS pressure reduction required.
THEN open only one PRZR PORV.
Step 12 continued on next page.
Page 28 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 Step II I 12.2.4
[]
[]
[]
[]
[]
[]
VESSEL HEAD STEAM VOIDING Revision 19 Action/Expected Response Response NOT Obtained I
I WHEN RCS pressure reduction
- required, THEN operate the following valves as required to control pressurizer pressure.
CHG FLOW FK 122 manually open 1A(1B) LOOP SPRAY VLV PK 444C manually open/closed PK 444D manually open/closed RCS PRZR AUX SPRAY Q1E21HV8145 open/closed RCS NORMAL CHG LINE Q1E21HV8146 open/closed RCS ALT CHG LINE Q1E21HV8147 open/closed Page 29 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II
_13
[CAl Continue RCS cooldown and pressure reduction.
13.1 Maintain RCS cold leg cooldown rate -
- LESS THAN 25°F/hr II ALL RCS LOOPS ACTIVE
- LESS THAN MAXIMUM ALLOWABLE LIMITS OF FIGURE 5 II AT LEAST ONE RCS LOOP INACTIVE 13.2 Check both CRDM CLG FANs -
RUNNING.
13.3 Maintain SUB COOLED MARGIN MONITOR indication greater than 68°F subcooled in CETC mode.
13.4 Maintain RCS cold leg temperature and pressure within FIGURE 3 limits.
RCS COLD LEG TEMP
[] TR 410 lC (IA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A 13.5 Go to Step 14.
13.6 WHEN RCS hot leg 430° F.
THEN maintain RCS 1900-1950 psig.
[] PI 402A
[] PI 403A temperature pressure
~
Response NOT Obtained 13.2 Go to Step 13.6.
13.3 Stop depressurization and reestablish subcooling.
Step 13 continued on next page.
Page 30 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-I-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II 13.7 WHEN RCS hot leg temperature less than 430°F.
THEN continue the cooldown and depressurization as follows.
13.7.1 Maintain SUB COOLED MARGIN MONITOR indication greater than 212°F subcooled in CETC mode until RCS pressure is reduced to 1200 psig.
13.7.2 Maintain RCS cold leg temperature and pressure within FIGURE 4 limits.
RCS COLD LEG TEMP
[] TR 410 lC (IA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A Response NOT Obtained 13.7.1 Stop depressurization and reestablish subcooling.
Step 13 continued on next page.
Page 31 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Step Action/Expected Response II 13.8 WHEN the RCS pressure is reduced to 1200 psig.
THEN perform the following.
13.8.1 Maintain RCS pressure at 1200 psig.
[] PI 402A
[] PI 403A 13.8.2 Maintain RCS cold leg temperature and pressure within FIGURE 4 limits.
RCS COLD LEG TEMP
[] TR 410 1C (lA) LOOP RCS WR PRESS
[] PI 402A
[] PI 403A 13.8.3 Cool down the RCS until RCS hot leg temperature is less than 350°F.
RCS HOT LEG TEMP
[] TR 413 Revision 19 Response NOT Obtained Step 13 continued on next page.
Page 32 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Step Action/Expected Response II 13.9 WHEN RCS hot leg temperature less than 350°F.
THEN perform the following.
13.9.1 Maintain RCS hot leg temperature 340-350°F.
RCS HOT LEG TEMP
[] TR 413 13.9.2 Maintain RCS pressure at 1200 psig.
[] PI 402A
[] PI 403A 13.9.3 WHEN RCS has soaked at 340-350°F for at least nine hours.
THEN proceed to step 13.10.
13.10
[CA] While continuing with the remaining steps of this procedure. maintain SUB COOLED MARGIN MONITOR indication greater than 68°F AND reduce RCS pressure to 350 psig.
[] PI 402A
[] PI 403A Page 33 of 40 Revision 19 Response NOT Obtained
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II 14 Action/Expected Response
[CAl Check no steam void in reactor vessel.
- Check pressurizer level - NO UNEXPECTED LARGE VARIATION.
- Check REACTOR VESSEL LEVEL indication - 100% UPPER HEAD.
14 Page 34 of 40 Response NOT Obtained Perform the following.
14.1 II both CRDM CLG FANs started.
THEN raise RCS pressure within FIGURE 3 limits.
IF NOT. raise RCS pressure within FIGURE 4 limits.
14.2 II RCS pressure reduction must continue.
THEN go to appropriate recovery procedure.
14.2.1 II RVLIS available.
THEN go to FNP-1-ESP-0.3.
NATURAL CIRCULATION COOLDOWN WITH ALLOWANCE FOR REACTOR VESSEL HEAD STEAM VOIDING (WITH RVLIS).
IF NOT. go to FNP-1-ESP-0.4. NATURAL CIRCULATION COOLDOWN WITH ALLOWANCE FOR REACTOR VESSEL HEAD STEAM VOIDING (WITHOUT RVLIS).
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II
_15 Check when to isolate SI accumulators.
15.1 Check power to discharge valves - AVAILABLE.
1A(1B.1C) ACCUM DISCH ISO
[] Q1E21MOV8808A
[] Q1E21MOV8808B
[] Q1E21MOV8808C 15.2
[CA] WHEN RCS pressure less than 1000 psig.
THEN close all SI accumulator discharge valves.
1A(1B.1C) ACCUM DISCH ISO
[] Q1E21MOV8808A
[] Q1E21MOV8808B
[] Q1E21MOV8808C 15.3
[CA] WHEN SI accumulator discharge valves closed.
THEN open and lock accumulator discharge valve disconnects using ATTACHMENT 2.
Response NOT Obtained 15.1 Close accumulator discharge valve disconnects using ATTACHMENT 1.
15.2 Vent any SI accumulator that cannot be isolated.
ACCUM N2 VENT
[] HIK 936 open SI ACCUM 1A 1B 1C 1A(1B.1C) ACCUM N2 SUPP/VT ISO Q1E21HV
[] 8875A [] 8875B [] 8875C open open open Page 35 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Step Action/Expected Response II
_16
_17
[CAl Maintain letdown flow.
16.1 WHEN letdown flow less than
- required, THEN open additional letdown orifice isolation valves.
LTDN ORIF ISO 45 GPM
[] Q1E21HV8149A LTDN ORIF ISO 60 GPM
[] Q1E21HV8149B
[] Q1E21HV8149C 16.2 WHEN letdown flow less than
- required, THEN adjust low pressure letdown control valve.
LP LTDN PRESS
[] PK 145
[CAl Maintain seal injection flow to each RCP 13 gpm.
SEAL WTR INJECTION
[] HIK 186 adjusted Page 36 of 40 Revision 19 Response NOT Obtained
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response II
_18
_19 Check if RHR system can be placed in service.
18.1 Check RCS hot leg temperatures
- LESS THAN 350°F.
RCS HOT LEG TEMP
[] TR 413 18.2 Check RCS narrow range range pressure - LESS THAN 350 psig.
[] PI 402B
[] PI 403B 18.3 Place RHR system in service using FNP-1-S0P-7.0. RESIDUAL HEAT REMOVAL SYSTEM.
[CAl Continue RCS cooldown to cold shutdown with RHR.
Response NOT Obtained 18.1 Return to step 13.
18.2 Return to step 13.
CAUTION:
Depressurizing the RCS before the entire RCS is less than 200°F may result in void formation in the RCS.
_20
[CAl Continue cooldown of inactive portion of RCS.
20.1 Maintain RCS pressure -
350-400 psig.
[] PI 402B
[] PI 403B 20.2 Verify both CRDM CLG FANs -
STARTED.
20.3 Continue dumping steam from all SGs.
Page 37 of 40
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NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 Step II 21 Action/Expected Response Check if RCS depressurization is permitted.
Response NOT Obtained NOTE:
FNP-1-S0P-68.0. INADEQUATE CORE COOLING MONITORING SYSTEM provides detailed operating instructions for the core exit T/C monitor.
21.1 Check reactor vessel upper head temperature - LESS THAN 200 0 F.
CORE EXIT THERMOCOUPLE MONITOR
[] TRAIN A (Points 4.7.9.
15.16.17.24.
26 )
[] TRAIN B (Points 2.3.6.
- 12) 21.2 Check all atmospheric relief valves - OPEN.
1A(lB.1C) MS ATMOS REL VLV
[] PC 3371A
[] PC 3371B
[] PC 3371C 21.3 Locally check SGs - NOT STEAMING.
21.4 Go to FNP-1-UOP-2.2. SHUTDOWN OF UNIT FROM HOT STANDBY TO COLD SHUTDOWN.
-END-Page 38 of 40 21.1 Return to step 19.
21.2 Perform the following.
21.2.1 Direct counting room to perform FNP-0-CCP-645. MAIN STEAM ABNORMAL ENVIRONMENTAL RELEASE.
21.2.2 Open all atmospheric relief valves.
1A(lB.1C) MS ATMOS REL VLV
[] PC 3371A
[] PC 3371B
[] PC 3371C 21.3 Return to step 19.
to NL-13-1257 T ~
~6-/1-4-/2-0-1-3-1-3-:5-7~-NA-T-U-RA-L--C-I-R-CU-L-A-T-IO
'~N-
-'~C~O~~O--WN--T-O ' -P-R-E-VE-N-T--RE-A-C-T-O-R--~------------~
FNP-1-ESP-0.2 VESSEL HEAD STEAM VOIDING Revision 19 START STEP o
CONTINUOUS ACTION CAUTION [CAl To ensure proper plant response.
FNP-1-EEP-0. REACTOR TRIP OR SAFETY INJECTION. must be entered upon any SI actuation.
1
[CAl Establish RCP support conditions.
o 10 0
11 013 1.10 [CAl IF support conditions exist to start an RCP. THEN start at least one RCP.
1.11 [CAl IF at least one RCP started. THEN go to FNP-1-UOP-2.1. SHUTDOWN OF UNIT FROM MINIMUM LOAD TO HOT STANDBY.
[CAl Establish adequate shutdown margin.
[CAl Verify both CRDM CLG FANs - STARTED.
4.2 [CAl Maintain RCS cold leg cooldown rate - LESS THAN 25F/hr.
4.5 [CAl Maintain SG narrow range levels approximately 65%.
[CAl Monitor for Inactive Loop(s) Stagnation Condition:
[cAl Monitor RCS cooldown.
[CAl Check CST level adequate to remain in FNP-1-ESP-0.2.
11.1 [CAl Using ATTACHMENT 3. check actual CST level above minimum required CST level for a 25F/hr cooldown. (actual CST level above 25F/hr line)
[CAl Continue RCS cooldown and pressure reduction.
13.10 [CAl While continuing with the remaining steps of this procedure. maintain SUB COOLED MARGIN MONITOR indication greater than 68F AND reduce RCS pressure to 350 psig.
[CAl Check no steam void in reactor vessel.
Page 39 of 40
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CIRCULATION c~;t~w~ TOl pREVENT VESSEL HEAD STEAM VOIDING 611412013 13:57 FNP-1-ESP-0.2 START STEP o 15 NATURAL REACTOR Revision 19 CONTINUOUS ACTION 15.2 [CA] WHEN RCS pressure less than 1000 psig. THEN close all SI accumulator discharge valves.
15.3 [CA] WHEN SI accumulator discharge valves closed. THEN 0
16 0
17 0
19 0
20 open and lock accumulator discharge valve disconnects using ATTACHMENT 2.
[CA] Maintain letdown flow.
[CA] Maintain seal injection flow to each RCP 13 gpm.
[CA] Continue RCS cooldown to cold shutdown with RHR.
[CA] Continue cooldown of inactive portion of RCS.
Page 40 of 40
6/14/2013 13:5 FNP-1-ESP-O.2 No.1 Seal Differential Pressure (PSID, See Note 1) to NL-13-1257 NATURAL CIRCULATION COOLDOWN TO PREVENT REACTOR VESSEL HEAD STEAM VOIDING Revision 19 2400 2250 zzuu 2000 1800 1600 1400 1200 1000 800 600 400 200 0
FIGURE 1 NO. 1 SEAL NORMAL OPERATING RANGE I
~------~------ -------------- ~-----1 -------
/
/
Norma 1
/
Operating Range I I
/
/
V
/
/ /
j V I
I I
I.
o.2 1
234 No.1 Seal Leak Rate (GPM) 5 Note 1: For No.1 Seal Differential Pressures greater than 400 psid. use ReS pressure in psig.
6
T I
- rT-' 1 ncosure 0
E I
3 t NL 13 1257 611412013 13:517 NATURAL CIRCULATION CO~~~N~TO ~REVENT REACTOR FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 FIGURE 2 RCP PRESSURE-TEMPERATURE OPERATING LIMITS 1800 I
1700 I
/:
1600 I
1500 I.
1400
/
1300
/
1200
/
1100 -
I
/
Accept able 1000 Rep V
Opera tion Res 900 Pressure
/1 Cpsigl 800 I
/
i 700
/
600 I ____
.. ~. -.
500 V
400
/
/
300 200 100 0
0 100 200 300 400 500 600 ReS Hot Leg Temperature (OF)
T I
- rT-' 1 ncosure 0
E I
3 t NL 13 1257 611412013 13:517 NATURAL CIRCULATION CO~~~N~TO ~REVENT REACTOR FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 FIGURE 3 COOLDOWN LIMITS TO AVOID UPPER HEAD VOID FORMATION WITH BOTH CRDM FANS RCS Pressure 3000(n i o) 2750 -
Unacceptable Regi on 1 50°F Subcoo 1 i ng I /
2500
....... 'J 2250 I 1-PTLR 40°F/ hr Curve I
2000
/
/
1750 I
Acceptable
/
Reg i on 1500
/
I 1250 Do Not Exceed Primary J
Unacceptable
/
To St eam Genera t or
/
Regi on 1000 Differen ti al Pressure
/
/
of 1600 PS ID.
/
/
750
/
./
500
./ /
250 0
200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625 650 675 700 RCS Cold Leg Tempera t ure (OF)
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3 t NL 13 1257 611412013 13:517 NATURAL CIRCULATION CO~~~N~TO ~REVENT REACTOR FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 FIGURE 4 COOLDOWN LIMITS TO AVOID UPPER HEAD VOID FORMATION WITHOUT CRDM FANS RCS Pressure 3000(n i a I
2750 -
Unacceptabl e Cooldown Regi on Limit Curve 2500
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" " 1-PTLR 40°F/hr Curve
/
2000
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I 1750
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I 1500 I
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I 1000 750 /
Acceptable Reg i on 500 250 0
200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625 650 675 700 RCS Cold Leg Tempera t ure (OF)
T I lrT-' 1 toNL-13-1257 r--6-/-14-/2-0-13-1-3 :--'5 r-17 -N-AT-U-RA-L-C-I-RC-U-LA-T-I 0-:N:-C-:-0~J6\\JN.l TO ~REVENT REACTOR FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 FIGURE 5 MAXIMUM COOLDOWN RATE VERSUS
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11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 I
Active Loop 6T (OF)
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~_~_ I.rT~~ __ 1~ _______________
E_n_C_O_Surr_e_3_t_o_N_L_-_1_3-_1_2_5_7~
NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response Response NOT Obtained II 1
Close the following disconnects.
ATTACHMENT 1
'A' Train Disconnects Disconnect Description Position TPNS No.
Q1R18B031-A Disconnect FU-Z3 MOV 8808C-A ON Q1R18B032-A Disconnect FU-Z2 MOV 8808A-A ON
'B' Train Disconnects Key Location Z-85 139 ' hallway-across from Z-84 MCC 1A Disconnect TPNS No.
Description Position Key Location Q1R18B035-B Disconnect FV-S2 MOV 8808B-B 2
Verify accumulator discharge valves MCB indication - POWER AVAILABLE.
1A(1B.1C) ACCUM DISCH ISO
[] Q1E21MOV8808A
[] Q1E21MOV8808B
[] Q1E21MOV8808C 3
Notify control room of accumulator discharge valve disconnect status.
-END-Page 1 of 1 ON 139' hallway-Z-86 acros s from chemistry sample room
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~_~_ I.rT~~ __ 1~ _______________
E_n_C_O_Surr_e_3_t_o_N_L_-_1_3-_1_2_5_7~
NATURAL CIRCULATION {~~O~N T~ PREVENT REACTOR 611412013 13:57 FNP-1-ESP-O.2 VESSEL HEAD STEAM VOIDING Revision 19 Step Action/Expected Response Response NOT Obtained II 1
Open and lock the following disconnects.
ATTACHMENT 2
'A' Train Disconnects Disconnect TPNS No.
Description Position Key Location Q1R18B031-A Disconnect FU-Z3 MOV 8808C-A LOCKED OPEN 139' hallway-Z-85 across from MCC 1A Q1R18B032-A Disconnect FU-Z2 MOV 8808A-A LOCKED Z-84 OPEN
'B' Train Disconnects Disconnect TPNS No.
Description Position Key Location Q1R18B035-B Disconnect FV-S2 MOV 8808B-B LOCKED OPEN 2
Notify control room of accumulator discharge valve disconnect status.
-END-Page 1 of 1 139' hallway-Z-86 across from chemistry sample room to NL-13-1257 6/14/2013 13:5 FNP-1-ESP-O.2 NATURAL CIRCULATION COOLDOWN TO PREVENT REACTOR VESSEL HEAD STEAM VOIDING ATTACHMENT 3 CALCULATION FOR ADEQUATE AVAILABLE CST INVENTORY Res Cooldown Rate vs Minimum Required CST Level lODF/br 35+----+----~--~----~---4----4---~--~~--~
30+---~----~----~--~----~---+~~4---~----~
~
~~~--~~--~--~--~--~~--~--~
g?
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~20+----+----+----+--~~--~----~--~--~~--~
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375 4l) 425 4ffi 475 ffX) 525
!XO Res TCOlD SODF;hr 7S DFfhr 1000F/hr NOTE: These plots are based on an M=W flowrate of 350 gpm. An accurate assessment of required CST inventory can be made using the following calculation and that result used to make a determination ff' a transition to ESP-O.3 or 0.4 is required.
[(
RCS*I'(,uUJ-3S0c-.,}.. '
]
.t\\... W flowrate X60 +- 12500 + 5.3 = Required {:S I Le\\:el Cooloowo Rate Basis:
- Current CooIdown Rate is in Degrees F per hour.
- Current AFW flowrate is in Gallons per minute,
- 350vF = Temperature required to place RHR on.. servlce.
12500 = Gaftons per foot of CST tavel.
- 60 :;: Minutes per hour.
5.3 = Minimum CST level in feet before having to shtft AFW suction to SW.
Revision 19
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~_~_ I.rT~~ __ 1~ _______________
E_n_C_O_Surr_e_3_t_o_N_L_-_1_3-_1_2_5_7~
CIRCULATIO 'O~Bl~o~~Gii! PREVENT VESSEL HEAD STEAM VOIDING 611412013 13:57 FNP-I-ESP-O.2 NATURAL Step Action/Expected Response II I 1
Monitor SI criteria.
1.1 Greater than 16°F subcooled in CETC mode and PRZR level above 4%.
2 Monitor switchover criteria.
2.1 CST level greater than 5.3 ft.
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REACTOR Revision 19 Response NOT Obtained 1.1 Verify SI actuated AND go to FNP-I-EEP-O.