ML17263A592
| ML17263A592 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 03/30/1994 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A585 | List:
|
| References | |
| ES-.2, ES-0.2, NUDOCS 9404190130 | |
| Download: ML17263A592 (48) | |
Text
EOPI ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 P
GE 1 of 17 ROCHESTE GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLE COPY NUMBER
~l TECHNICAL EVIEW C
PORC REVIEW DATE
+
j PLAN SUPE NTENDENT EFFECTIVE DATE CATEGORY 1.0 REVIEWE BY:
9404190i30 9404i4 PDR;.
'; AMUCK'05000244
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EOP:
ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 2 of 17 A.
PURPOSE 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'pper head void formation.
B.
SYMPTOMS AND OR ENTRY CONDITIONS This procedure is entered from:
- 1) ES-0.1, REACTOR TRIP RESPONSE, when it has been determined that a natural circulation cooldown is required.
2 )
ECA 0 ~ 1 ~
LOSS OF ALL AC POWER RECOVERY WITHOUT SI REQUIRED /
when it has been determined that a natural circulation cooldown is required.
- 3) Other normal operating procedures when a natural circulation cooldown is required.
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 3 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED x x **%********************
CAUTION o
IF SI ACTUATION OCCURS DURING THIS PROCEDURE, E-O, REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORMED.
o IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST, THEN THE AFFECTED RCP SHOULD NOT BE STARTED PRIOR TO A STATUS EVALUATIONS
- * * * * * * * * * * * * * * * * * * * * *
- 0' NOTE:
Foldout page should be open and monitored periodically.
- 1 Monitor Conditions For RCP Restart:
- a. Establish conditions for starting an RCP:
o Bus llA or llB energized o
Refer to Attachment RCP START
- b. Start one RCP
- c. Any RCP RUNNING d.
Go to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD CONDITION a.
Go to Step 2.
c.
Go to Step 2.
EOP:
ES-0.2 NATURAL CIRCULATION COOLDOWN REV 7
PAGE 4 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 2
Check VCT Makeup System:
- a. Verify the following:
- 1) Boric acid flow control valve SET FOR REQUIRED CSD CONCENTRATION 2)
RMW mode selector switch in AUTO 3)
RMW control armed RED LIGHT LIT b.
Check VCT level o
Level -
GREATER THAN 20%
-OR-o Level -
STABLE OR INCREASING
- b. Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and RMW pumps running.
- 2) Place RMW flow control valve HCV-111 in MANUAL and increase RMW flow.
- 3) Increase boric acid flow as necessary.
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 5 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 3
Check Charging Pump Suction Aligned To VCT:
a.
Check VCT level:
o Level - GREATER THAN 20%
o VCT makeup system
- AVAILABLE
- a. IF VCT level can NOT be maintained greater than 5%,
THEN perform the following:
- 1) Ensure charging pump suction aligned to RWST o 'CV-112B open o
LCV-112C closed
- 2) Continue with Step 4.
WHEN VCT level greater than 40%,
THEN do Step 3b.
- b. Verify the following:
o LCV-112C -
OPEN o
LCV-112B -
CLOSED
- b. Manually align valves as necessary.
4 Borate RCS To Cold Shutdown Boron Concentration (Refer to Figure SDM) 5 Establish Maximum Rx Vessel Head Cooling:
o Check control rod shroud fans (45 kw)
BOTH RUNNING Start fans as necessary.
o Check one Rx compartment cooling fan (23 kw)- RUNNING
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV 7
PAGE 6 of 17
- STEP, ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6 Verify Adequate Shutdown Margin
~ RCS loop A
~ RCS loop B
~ PRZR
- b. Perform the following:
- 2) Continue to borate as necessary.
)
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 7 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED x x ***a****x x ****x
% x *******
CAUTION o
IF CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW PUMPS WILL BE NECESSARY (REFER TO ER-AFW.1, ALTERNATE WATER SUPPLY TO. AFW PUMPS).
o SI MUST BE BLOCKED BEFORE S/G PRESSURE DECREASES TO 514 PSIG.
o THE hT BETWEEN PRZR LIQUID AND THE HOT LEG TEMPERATURE SHOULD NOT BE PERMITTED TO EXCEED 200'F.
IF THIS LIMIT'IS
- EXCEEDED, THEN NOTIFY TECHNICAL ENGINEERING OF THE MAXIMUM hT OBSERVED.
- x*% ***********
x**********
x ***%*********
7 Initiate RCS Cooldown To Cold Shutdown:
a.
Dump steam to condenser
- b. Establish and maintain cooldown rate in RCS cold legs LESS THAN 25'F/HR
- c. Maintain S/G narrow range level BETWEEN 17%
AND 39%
- a. Manually or locally dump steam using S/G ARVs.
- c. Control feed flow as necessary.
- d. Plot RCS cold leg temperatures and PRZR temperature twice per hour (Refer to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD SHUTDOWN, for plot paper)
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 8 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 8
Check RCS Hot Leg Temperatures LESS THAN 550'F Return to. Step 7.
NOTE:
o If charging line to PRZR vapor hT exceeds 320'F, then plant staff should be consulted before using auxiliary spray.
4' WHEN using a PRZR
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
9 Depressurize RCS To 1950 PSZG:
a.
Check letdown
- IN SERVICE
- a. Try to establish letdown (Refer to Attachment LETDOWN).
- b. Depressurize RCS using auxiliary spray valve (AOV-296)
IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 10.
- b. IF auxiliary spray valve NOT available, THEN use one PRZR PORV.
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 9 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 4**************%
CAUTION SI ACTUATION CIRCUITS WILL AUTOMATICALLYUNBLOCK IF PRZR PRESSURE INCREASES TO GREATER THAN 1992 PSIG.
x x x***************x****
- 10 Monitor SI Block Criteria:
a.
Check the following:
o PRZR pressure
- LESS THAN 1950 PSIG
- a. Return to Step 9.
-OR-o LOW PRZR PRESS BLOCK SAF INJEC status light - LIT
- b. Place SI block switches to BLOCK
~ Train A
~ Train B
- c. Verify SAFETY INJECTION BLOCKED status light - LIT
- c. Maintain PRZR pressure greater than 1750 psig and S/G pressure greater than 514 psig until SI blocked.
ll Determine RCS Pressure And Temperature Limits:
a.
Check control rod shroud fans BOTH RUNNING a.
Perform the following:
- b. Maintain RCS pressure
- WITHIN LIMITS OF FIGURE NAT CIRC C/D WITH SHROUD FANS 2)
Go to Step 12.
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 10 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 12 Maintain PRZR Level Between 204 And 304
- 13 Monitor RCS Cooldown:
o Core exit T/Cs
- DECREASING o
RCS hot leg temperatures DECREASING o
RCS subcooling based on core exit T/Cs INCREASING o
Cooldown rate in RCS'old legs LESS THAN 25'F/HR
EOP:
ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE ll of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
% ****x ****************
CAUTION VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION.
THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL.
x**x%*********
x***********
NOTE:
o If at any time it is determined that a natural circulation cooldown and depressurization must be performed at a rate that may form a steam void in the vessel, then procedure ES-0.3, NATURAL CIRCULATION COOLDOWN WITH STEAN VOID IN VESSEL, should b'e used.
o If charging line to PRZR vapor hT exceeds 320'F, then plant staff should be consulted. before using auxiliary spray.
o WHEN using a PRZR PORV, THEN select one with an operable block valve.
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
14 Initiate RCS Depressurization:
a.
Check letdown
- IN SERVICE
- a. Try to establish letdown (Refer to Attachment LETDOWN).
- b. Depressurize RCS using auxiliary spray valve (AOV-296)
IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 15.
- b. IF auxiliary spray valve NOT available, THEN use one PRZR PORV.
- c. Plot RCS temperature and pressure on curve selected in Step ll hourly
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EOP:
ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 12 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Continue Cooldown And Depressurization:
a.
Check RCS cold leg temperature GREATER THAN 335'F
- b. Maintain cooldown rate in RCS cold legs
- LESS THAN 25 'F/HR
- a. Stabilize RCS temperature and go to Step 15c.
- c. Maintain RCS temperature and pressure within limits of Figure determined previously
- c. Control RCS-pressure as necessary to restore pressure/
temperature relationship to within limits of approprite Figure.
16 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPlNG VCT) 17 Check For Steam Void In Reactor Vessel:
Repressurize RCS within allowable limits and continue cooldown.
o PRZR level NO UNEXPECTED LARGE VARIATIONS o
GREATER.
THAN 95%
IF RCS depressurization must
- continue, THEN go to ES-0.3, NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL.
4
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 13 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 18 Check If SI ACCUMs Should Be Isolated:
a.
RCS pressure LESS THAN 1500 PSIG
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ ACCUM A, MOV-841
~ ACCUM B, MOV-865 a.
Continue with Step 19.
WHEN RCS pressure is less than 1500 psig, THEN do Steps 18b through d.
- c. IF any valve can NOT be closed, THEN perform the following:
- 1) Dispatch personnel to locally close valves, as necessary.
IF any SI ACCUM can NOT be isolated AND RCS depressurization to less than 1000 psig is required, THEN:
- 1) Open vent valves for unisolated SI ACCUMs.
- d. Locally open breakers for MOV-841 and MOV-865
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
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ES-0 '
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 14 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 19 Maintain Letdown Flow:
a.
Open letdown orifice valves as necessary
- b. Adjust low pressure letdown control valve setpoint as necessary
- 20 Maintain Required RCP Seal Injection Flow And Labyrinth Seal D/P:
o Labyrinth seal D/P to each RCP GREATER THAN 15 INCHES OF WATER Perform the following:
o Adjust charging flow to REGEN Hx (HCV-142) as necessary.
-OR-o Seal injection flow to each RCP GREATER THAN 6 GPM o
Dispatch AO to adjust seal injection needle valves if necessary.
~ RCP A, V-300A
~ RCP Bi V-300B
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 15 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
.21 Check If SI System Normal Shutdown Alignment Should Be Established:
a.
RCS cold leg temperature LESS THAN 350'F
- a. Return to Step 15.
b.
RCS pressure LESS THAN 1500 PSIG
- c. Lock out SI system as follows:
- 1) Place all SI pump switches in PULL STOP
- b. Stabilize RCS temperature and return to Step 14.
- 2) Locally close breakers for SI pump discharge valves to cold legs
~ MOV-878B, MCC D position 8C
~ MOV-878D, MCC D position 8F
- 3) Close SI pump discharge to cold legs
~ MOV-878B
~ MOV-878D
- 4) Locally open breakers for MOV-878B and MOV-878D
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 16 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 22 Check If RHR Normal Cooling Can Be Established:
a.
RCS pressure LESS THAN 400 PSIG
- b. Verify all SI pump switches in PULL STOP
- a. Stabilize RCS temperature and return to Step 14.
- b. Return to Step 21.
c.
Sample the RHR system to ensure adequate boron concentration (Refer to Attachment RHR SAMPLE)
- d. Place RCS overpressure protection system in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
- d. IF RCS overpressure protection system can NOT be placed in
- service, THEN consult Plant staff to determine if RHR normal cooling should be established and go to Step 23
'3 Continue RCS Cooldown To Cold Shutdown 0 ****************
CAUTION DEPRESSURIZING THE RCS BEFORE 'THE ENTIRE RCS IS LESS THAN 200'F MAY RESULT IN ADDITIONALVOID FORMATION IN THE RCS.
x***'%**x***x***********
24 Continue Cooldown Of Inactive Portion Of RCS:
a.
Cool upper head region using control rod shroud fans
- b. Cool S/G U-tubes by dumping steam from all S/Gs
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 17 of 17 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 4 *********************
CAUTION IF LESS THAN TWO CONTROL ROD SHROUD FANS ARE RUNNING, THE UPPER HEAD REGION MAY REMAIN ABOVE 200'F FOR UP TO 29 HOURS AFTER REACHING CSD.
25 Determine If RCS Depressurization Is Permitted:
- a. Entire RCS
- LESS THAN 200'F a.
Do NOT depressurize RCS.
~ Core exit T/Cs
~ Upper head T/Cs
~ RCS hot leg temperature
~ RCS cold leg temperature b.
Check control rod shroud fan status BOTH RUNNING DURING COOLDOWN
- c. Maintain cold shutdown conditions (Refer to 0-2.3, PLANT AT COLD SHUTDOWN)
Return to Step 23.
- b. Consult Plant staff to determine wait period for upper head cooling.
-END-
~ )
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 1 of 1 ES-0.2 APPENDIX LIST TITLE 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
FIGURE SDM 4)
FIGURE NAT CIRC C/D WITHOUT SHROUD FANS 5)
FIGURE NAT CIRC C/D WITH SHROUD FANS
~ 6)
ATTACHMENT RCP START 7)
ATTACHMENT LETDOWN 8)
ATTACHMENT RHR COOL 9)
ATTACHMENT RHR SAMPLE 10)
FOLDOUT PAGES
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV 7
PAGE 1 of 1 RED PATH
SUMMARY
a.
SUBCRITICALITY Nuclear power greater than 54 b.
CORE COOLING Core exit T/Cs greater than 1200'F
-OR-Core exit T/Cs greater than 700'F AND RVLIS level (no RCPs) less than 43%
[46%
adverse CNMT]
c.
HEAT SINK Narrow range level in all S/Gs less than 54
[25< adverse CNMT] AND total feedwater flow less than 200 gpm d.
INTEGRITY Cold leg temperatures decrease greater than 100'F in last 60 minutes AND RCS cold leg temperature less than 285'F e.
CONTAINMENT CNMT pressure greater than 60 psig
f
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ES-0 '
TlTLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE:
Subcooling Margin = Saturation Temperature From Figure Below f-] Core Exit T/C Indication RC 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0
S PRESSURE (PSIG)
RCS PRESSURE INCREMENTS 20 PSIG SUBCOOLED REGION ADVERS CNMT NORMAL CNMT INADEQUATE SUBCOOL ING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)
EOP:
ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 1 of 1 NOTE'IGURE SDM o Curve includes allowance for one stuck rod.
Add 100 ppm for each additional stuck rod.
o To obtain core. burnup, use PPCS turn on code BURNUP.
BORON CONCENTRATION (PPH) 1800 1600 BORON INCREMENTS 20 PPH 1400 1200 1000 ADEQUATE SDH 100 PPH CONS ERVATISH INCLUDED 800 600 400 BORA 200 BURNUP
'NCREMENTS 100 MWD/HTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 CYCLE 24 BURNUP (MWD/MTU)
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 7
PAGE 1 of 1 RCS PRESSURE (PSIG) 2500 FIGURE NAT CIRC C
D WITHOUT SHROUD FANS 2400 2300 2200 2100 2000 1900 1800 1700 1600 RCS PRESSURE INCREMENTS 20 PSIG RCS temp for S/G SI (514 psig)
SI UNBLOCK NORMAL RANGE 1500 1,400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 ioo
[2] Wait 29 hrs before decreasing RCS pressure less than 350 psig to prevent boiling in upper head
[1] Wait ll hrs before decreasing RCS pressure less than 1600 psig TEMPERATURE INCREMENTS 10'F 0
50 100 150 200 250 300 350 400 450 500 550 600 650 700 RCS COLD LEG TEMPERATURE ('F)
EOP:
ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
7 PAGE 1 of 1 RCS 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400
.300 200 ioo PRESSURE (PSIG)
RCS PRESSURE INCREMENTS 20 PSIG FIGURE NAT CIRC C
D WITH SHROUD FANS RCS temp for S/G SI (514 psig)
SI UNBLOCK NORMAL RANGE TEMPERATURE INCREMENTS 10'F 0
50 100 150 200 250 300 350 '00 450 500 550 600 650 700 RCS COLD LEG TEMPERATURE ('F)
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV 7
PAGE 1 of 1 RCP TRIP CRITERIA FOLDOUT PAGE 2
~
IF BOTH conditions listed below occur, THEN trip both RCPs:
a.
SI pumps AT LEAST TWO RUNNING b.
RCS pressure minus maximum S/G pressure LESS THAN 175 PSIG SI ACTUATION CRITERIA IF EITHER condition listed below occurs, THEN actuate SI and go to E-O, REACTOR TRIP OR SAFETY INJECTION, Step 1.
o RCS subcooling based on core exit T/Cs LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING OR 3.
o PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 54 AFW SUPPLY SWITCHOVER CRITERION IF CST level decreases to less than 5 feet, THEN switch to alternate AFW water supply (Refer to ER-AFW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).
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