ML17263A594
| ML17263A594 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 03/30/1994 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A585 | List:
|
| References | |
| ES-1.2, NUDOCS 9404190134 | |
| Download: ML17263A594 (94) | |
Text
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 1 of 23 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER
- A3 TECHNICAL REVIEW PORC REVIEW DATE
+ 3~ /9 PLANT SUPERINTENDENT EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:
>9'40419'0134 940414 PDR ADOCK 05000244 "P
'PDR
p
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 2 of 23 A.
PURPOSE - This procedure provides actions to cool down and depressurize the RCS to cold shutdown conditions following a loss of reactor coolant inventory.
B.
ENTRY CONDITIONS/SYMPTOMS l.
ENTRY CONDITIONS This procedure is entered from:
E 1 g LOSS OF REACTOR OR SECONDARY COOLANTg when RCS pressure is greater than the shutoff head pressure of the RHR pumps.
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ES-1.2 T!TLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 3 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- %**x*4*x**xx*x%xxx***x***xx***4*x***
CAUTION o
IF RWST LEVEL DECREASES TO LESS THAN 28%,
THEN THE SI SYSTEM SHOULD BE ALIGNED FOR COLD LEG RECIRCULATION USING ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, STEP 1.
o IF PRZR LEVEL IS LESS THAN 50%
OR IF ADVERSE CNMT CONDITIONS EXIST, THEN PRZR HEATERS SHOULD NOT BE ENERGIZED UNTIL PRZR LEVEL IS EVALUATED BY THE TSC.
o RCS PRESSURE SHOULD BE MONITORED.
IF RCS PRESSURE DECREASES TO LESS THAN 250 PSIG
THEN THE RHR PUMPS MUST BE MANUALLY RESTARTED TO SUPPLY WATER TO THE RCS.
0 **x
- x
% x **************x*****
NOTE:
o Foldout page should be open and monitored periodically.
o Adverse CNMT values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+
R/hr.
- 1 Monitor If RHR Pumps Should Be Stopped:
a.
Check RCS pressure:
- 1) Pressure GREATER THAN 250 psig
[465 psig adverse CNMT]
- 2) Pressure STABLE OR INCREASING a.
Go to Step 2.
b; Stop RHR pumps and place AUTO
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 4 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 2 Monitor All AC Busses BUSSES ENERGIZED BY OFFSITE POWER o
Normal feed breakers to all 480 volt busses CLOSED o
480 bus voltage GREATER THAN 420 VOLTS o
Emergency D/G output breakers OPEN Perform the following:
- a. IF any AC emergency bus normal feed breaker
- open, THEN ensure associated D/G breaker closed.
- b. Perform the following, as necessary:
- 1) Close non-safeguards bus tie breakers:
~ Bus 13 to Bus 14 tie
~ Bus 15 to Bus 16 tie
- 2) Place the following pumps in PULL STOP:
~
EH pumps
~ Turning gear oil pump
~ HP seal oil backup pump
- 3) Restore power to MCCs.
L
~ A from Bus 13
~
B from Bus 15 E from Bus 15
~ F from Bus 15 4)
WHEN bus 15 restored, THEN reset control room lighting.
- 5) Refer to Attachment SI/UV for other equipment lost with loss of offsite power.
- c. Try to restore offsite power to all AC busses (Refer to ER-ELEC.1, RESTORATION OF OFFSITE POWER).
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 5 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 3 Establish 75 GPM Charging Flow:
- a. Charging pumps
- ANY RUNNING a.
Perform the following:
- 1) IF CCW flow is lost to any RCP thermal barrier OR any RCP ¹1 seal outlet temperature offscale high, THEN dispatch AO with RWST area key to locally isolate seal injection to affected RCP:
~ V-300A for RCP A
~ V-300B for RCP B
- 2) Ensure HCV-142 open, demand at Oa.
- b. Align charging pump suction to RWST:
o LCV-112B -
OPEN o
LCV-112C -
CLOSED
- b. IF LCV-112B can NOT be opened, THEN perform the following:
- 1) Verify charging pump A NOT running and place in PULL STOP.
- c. Start charging pumps as necessary (75 kw each) and establish 75 gpm total charging flow
- 2) Dispatch AO to locally open manual charging pump suction from RWST (V-358 located in charging pump room).
3)
WHEN V-358 open, THEN direct AO to close V-268 to isolate charging pumps B and C from VCT (V-268 located in charging pump room).
~ Charging line flow
~ Seal injection flow
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ES-1.2 TITLE POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 6 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 4 Establish Condenser Steam Dump Pressure Control:
- a. Verify condenser available:
o Any MSIV -
OPEN o
Annunciator G-15, STEAM DUMP ARMED - LIT a.
Place S/G ARV controllers in AUTO at desired pressure and go to Step 5.
- b. Adjust condenser steam dump controller HC-484 to desired pressure and verify in AUTO
- c. Place steam dump mode selector switch to MANUAL
- x**x x ****xx ****xx ******
x ***********
CAUTION 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).
- x **% x ******
x ****x* x ***x x ****x ***********
NOTE:
TDAFW pump flow control valves fail open on loss of IA.
- 5 Monitor Intact S/G Levels:
- a. Narro~ range level GREATER THAN 5%
[25% adverse CNMT)
- a. Maintain total feed flow greater than 200 gpm until narrow range level greater than 5%
[25%
adverse CNMT] in at least one S/G.
- b. Control feed flow to maintain narrow range level between 17%
[25% adverse CNMT] and 50%
- b. IF narrow range level in any S/G continues to increase in an uncontrolled manner, THEN go to E-3, STEAM GENERATOR TUBE
- RUPTURE, Step 1.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 7 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Shutdown margin should be monitored during RCS cooldown (Refer to Figure SDM).
6 Initiate RCS Cooldown To Cold Shutdown:
- a. Establish and maintain cooldown rate in RCS cold legs LESS THAN 100'F/HR b.
Use RHR system if in service c.
Dump steam to condenser from intact S/G(s)
- c. Manually or locally dump steam using intact S/Gs ARV.
7 Check RCS Subcooling Based On Core Exit T/Cs GREATER THAN O'F USING FIGURE MIN SUBCOOLING Manually operate SI pumps as necessary and go to Step 19.
8 Check SI and RHR Pump Status:
Go to Step 15.
o SI pumps
- ANY RUNNING
-OR-o RHR pumps ANY RUNNING "IN INJECTION MODE 9 Place PRZR Heater Switches In The Following Positions:
o PRZR heater control group PULL STOP o
PRZR heater backup group OFF
t l
~ I e
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 8 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- xx**x******
x x I *xx*******x*x***x x.*****
CAUTION VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION.
THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL.
- 4 *****************
x *******************
NOTE:
o 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.
10 Depressurize RCS To Refill PRZR'.
Depressurize using normal PRZR spray if available
- a. Depressurize using one PRZR PORV
~
IF IA NOT available, THEN refer to Attachment N2 PORVS.
b.
PRZR level GREATER THAN 13%
[40% adverse CNMT]
- b. Continue with Step 11.
WHEN level greater than 13%
[40%
adverse CNMT], THEN stop RCS depressurization.
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TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 9 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED x*P*****xxx**xxxxxxx*xx*xxx****x***x**
CAUTION IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST, THEN THE AFFECTED RCP SHOULD NOT BE STARTED PRIOR TO A STATUS EVALUATION.
- x******xxxxx*xx**x*xxxx*xxx*xx**xx*x*
11 Check If An RCP Should Be Started:
a.
Both RCPs STOPPED b.
RCS subcooling based on core exit T/Cs GREATER THAN O' USING FIGURE MIN SUBCOOLING a.
Stop all but one RCP and go to Step 12.
b.
Go to Step 19.
c.
PRZR level GREATER THAN 13%
[40% adverse CNMT]
- c. Return to Step 10.
- d. Try to start an RCP
- 1) Establish conditions for starting an RCP o
Bus 11A or 11B energized
- d. IF IA to CNMT available, THEN ensure at least one control rod shroud fan running (45 kw each).
o Refer to Attachment RCP START
- 2) Start one RCP
P
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 10 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 12 Check If One Of Three SI Pumps Should Be Stopped:
a.
Three SI pumps RUNNING b.
RCS subcooling based on core exit T/Cs GREATER THAN 35'F
[90'F adverse CNMT] USING FIGURE MIN SUBCOOLING a.
Go to Step 13.
C
- b. IF RCS hot leg temperatures greater than 320'F [310'F adverse CNMT] OR IF RHR normal cooling in service, THEN go to Step 19.
IF RHR normal cooling NOT in service AND RCS hot leg temperatures less than 320'F
[310'F adverse CNMT], THEN ensure at least one RHR pump running in injection mode and go to Step 12c.
IF no RHR pump can be operated in injection mode, THEN go to Step 19.
c.
Check PRZR level GREATER THAN 13%
[40% adverse CNMT]
d.
Stop one SI pump c.
Do NOT stop SI pump.
Return to Step 10.
0
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ES-1 '
TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 11 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Check If One Of Two SI Pumps Should Be St:opped:
a.
Two SI pumps RUNNING
- b. Determine required RCS subcooling from table:
a.
Go to Step 14.
Charging Pump Availability NONE ONE TWO THREE RCS Subcooling Criteria 120'F [200'F adverse CNMT]
115 'F [190'F adverse CNMT]
105'F [180'F adverse CNMT]
100'F
[175 'F adverse CNMT]
c.
RCS subcooling based on core exit T/Cs GREATER THAN VALUE FROM TABLE ABOVE USING FIGURE MIN SUBCOOLING
- c. IF RCS hot leg temperatures greater than 320'F [310'F adverse CNMT]
OR IF RHR normal cooling in service, THEN go to Step 19.
IF RHR normal cooling NOT in service AND RCS hot leg temperatures less than 320'F
.[310'F adverse CNMT], THEN ensure at'least one RHR pump running in injection mode and go to Step 13d.
IF no RHR pump can be operated in injection mode, THEN go to Step 19.
d.
PRZR level GREATER THAN 13%
[40% adverse CNMT]
e.
Stop one SI pump d.
Do NOT stop SI pump.
Return to Step 10.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 12 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 14 Check If Last SI Pump Should Be Stopped:
a.
One SI pump RUNNING
- a. IF any RHR pump running in injection mode, THEN go to Step 19.
IF NOT, THEN go to Step 15.
- b. Determine required RCS subcooling from table:
Charging Pump Availability RCS Subcooling Criteria NONE ONE TWO THREE Insufficient subcooling to stop SI pump.
255'F [295'F adverse CNMT]
235'F [285'F adverse CNMT]
210'F [270'F adverse CNMT]
c.
RCS subcooling based on core exit T/Cs GREATER THAN VALUE FROM TABLE ABOVE USING FIGURE MIN SUBCOOLING d.
PRZR level GREATER THAN 13%
[40% adverse CNMT) e.
Stop running SI pump
- c. IF RCS hot leg temperatures greater than 320'F [310'F adverse CNMT] OR IF RHR normal cooling in service, THEN go to Step 19.
IF RHR normal cooling NOT in service AND RCS hot leg temperatures less than 320'F
[310'F adverse CNMT], THEN ensure at least one RHR pump running in injection mode and go to Step 14d.
IF no RHR pump can be operated in injection mode, THEN go to Step 19.
d.
Do NOT stop SI pump.
Return to Step 10.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 13 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Check If Charging Flow Should Be Controlled To Maintain PRZR Level:
a.
Check RHR pumps RUNNING IN INJECTION MODE b.
Go to Step 19
- a. Start charging pump and control charging flow to maintain PRZR level and go to Step 16.
@ ***x *****x x
- x**********
x*********
CAUTION IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST, THEN THE AFFECTED RCP SHOULD NOT BE STARTED PRIOR TO A STATUS EVALUATION.
- * * * * * * * * * * *
- P * * * * * * * * * * * * * * * * *
- x * * * * * * *
- 16 Check RCP Status:
a.
- AT LEAST ONE RUNNING a.
Perform the following:
4
- 1) Establish conditions for starting an RCP:
o Verify Bus 11A or llB energized.
o Refer to Attachment RCP START.
- 2) Start one RCP.
IF an RCP can NOT be started, THEN verify natural circulation (Refer to Attachment NC).
IF natural circulation NOT
- verified, THEN increase dumping steam.
- b. Stop all but one RCP
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 14 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- x x ******
x *****x*******************
CAUTION VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION.
THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL.
x x ***x x ****x ***x ****x *************
NOTE:
o 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.
17 Depressurize RCS To Minimize RCS Subcooling:
- a. Depressurize using normal PRZR spray if available
- a. IF normal spray NOT available, THEN use one PRZR PORV.
IF IA NOT available, THEN refer to Attachment N2 PORVS.
IF no PRZR PORV available, THEN use auxiliary spray valve (AOV-296).
- b. Energize PRZR heaters as necessary
- c. Depressurize RCS until EITHER of the following conditions satisfied:
o RCS subcooling based on core exit T/Cs LESS THAN 10'F USING FIGURE MIN SUBCOOLING
-OR-o PRZR level GREATER THAN 75%
[65% adverse CNMT]
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ES-1.2 POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 15 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 18 Verify Adequate Shutdown Margin
- b. Borate as necessary.
- 19 Monitor SI Reinitiation Criteria:
a.
RCS subcooling based on core exit T/Cs GREATER THAN O' USING FIGURE MIN SUBCOOLING
- a. Manually operate SI pumps as necessary and go to Step 20.
b.
PRZR level GREATER THAN 5%
[30% adverse CNMT)
- b. Manually operate SI pumps as necessary and return to Step 10.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 16 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 20 Check If SI ACCUMs Should Be Isolated:
a.
RCS subcooling based on core exit T/Cs GREATER THAN O' USING FIGURE MIN SUBCOOLING
- a. IF both RCS hot leg temperatures less than 400'F, THEN go to Step 20c.
IF NOT, THEN go to Step 21.
b.
PRZR level GREATER THAN 5%
[30% adverse CNMTj
- c. Dispatch AO with locked valve key to locally close breakers for SI ACCUM discharge valves MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- d. Close SI ACCUM discharge valves
~ ACCUM A, MOV-841
~ ACCUM B, MOV-865
- b. Return to Step 10.
- d. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B 4
- e. Locally reopen breakers for MOV-841 and MOV-865
- 2) Open HCV-945.
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ES-1 '
TITLE:
POST LOCA COOLDOWN, AND DEPRESSURIZATION REV:
12 PAGE 17 of 2
STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 21 Check If Emergency D/Gs Should Be Stopped:
- a. Verify AC emergency busses energized by offsite power:
o Emergency D/G output breakers OPEN
- a. Try to restore offsite power (Refer to ER-ELEC.1, RESTORATION OF OFFSITE POWER).
o AC emergency bus voltage GREATER THAN 420 VOLTS o
AC emergency bus normal feed breakers CLOSED b.
Stop any unloaded emergency D/G and place in standby (Refer to Attachment D/G STOP) 22 Verify Adequate SW Flow To CCW Hx:
- a. Verify at least two SW pumps RUNNING
- a. Manually start pumps as power supply permits (258 kw per pump).
IF less than two SW pumps can be operated, THEN go to Step 23.
- b. Verify AUX BLDG SW isolation valves OPEN
~ MOV-4615 and MOV-4734
~ MOV-4616 and MOV-4735
- c. Verify CNMT RECIRC fan annunciator C-2, HIGH TEMPERATURE ALARM -
EXTINGUISHED
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ES-1.2 POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 18 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 23 Check RCP Cooling a.
Check CCW to RCPs Establish normal cooling to RCPs (Refer to Attachment SEAL COOLING).
o Annunciator A-7, RCP lA CCW RETURN HIGH TEMP OR LOW FLOW EXTINGUISHED o
Annunciator A-15, RCP 1B CCW RETURN HIGH TEMP OR LOW FLOW EXTINGUISHED b.
Check RCP seal injection o
Labyrinth seal D/Ps GREATER THAN 15 INCHES WATER
-OR-o RCP seal injection flow to each RCP GREATER THAN 6 GPM
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 19 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 24 Check If Seal Return Flow Should Be Established:
- a. Verify instrument bus D
ENERGIZED
- b. Verify RCP ¹1 seal outlet temperature LESS THAN 235'F
b.
Go to Step 25.
- c. Verify RCP seal outlet valves OPEN
- c. Manually open valves as necessary.
~ AOV-270A
~ AOV-270B
- d. Reset both trains of XY relays for RCP seal return isolation valve MOV-313 e.
Open RCP seal return isolation valve MOV-313 e.
Perform the following:
- 1) Place MOV-313 switch to OPEN.
- f. Verify RCP ¹1 seal leakoff flow LESS THAN 5.5 GPM
- f. IF any RCP seal leakoff flow greater than 5.5
- gpm, THEN perform the following:
o Close the affected RCP seal discharge valve
~ RCP A, AOV-270A
~ RCP B, AOV-270B o
Trip the affected RCP
- g. Verify RCP ¹1 seal leakoff flow GREATER THAN 0.25 GPM IF both RCP seal discharge valves are shut, THEN go to Step 25.
- g. Refer to AP-RCP.l, RCP SEAL MALFUNCTION.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURXZATION REV:
12 PAGE 20 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Adverse CNMT conditions or loss of forced air cooling may result in failure of NIS detectors.
25 Check Xf Source Range Detectors Should Be Energized:
a.
Source range channels,-
DEENERGIZED a.
Go to Step 25e.
b.
Check intermediate range flux EITHER CHANNEL LESS THAN 10 10 AMP
- b. Perform the following:
- 1) IF neither intermediate range channel is decreasing, THEN initiate boration.
- 2) Continue with Step 26.
WHEN flux is LESS THAN 10 amps on any operable
- channel, THEN do Steps
- 25c, d and e.
c.
Check the following:
o Both intermediate range channels LESS THAN 10-10 AMPS
- c. Continue with Step 26.
WHEN either condition met, THEN do Steps 25d and e.
-OR-o Greater than 20 minutes since reactor trip
- d. Verify source range detectors ENERGIZED
- d. Manually energize source range detectors by depressing P-6 permissive defeat pushbuttons (2
of 2).
- e. Transfer Rk-45 recorder to one source range and one intermediate range channel IF source ranges can NOT be
- restored, THEN refer to ER-NIS.1, SR MALFUNCTION and go to Step 25.
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 21 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 26 Establish Normal Shutdown Alignment:
a.
Check condenser
- AVAILABLE
- a. Dispatch AO to perform Attachment SD-2.
- b. Perform the following:
o Open generator disconnects
~ 1G13A71
~ 9X13A73 o
Place voltage regulator to OFF o
Open turbine drain valves o
Rotate reheater steam supply controller cam to close valves o
Place reheater dump valve switches to HAND o
Stop all but one condensate pulllp
- c. Verify adequate Rx head cooling:
Go to Step 26d.
- 2) Verify at least one control rod shroud fan RUNNING
- 2) Manually start one fan as power supply permits (45 kw)
- 3) Verify one Rx compartment cooling fan -
RUNNING
- 3) Perform the following:
o Dispatch AO to reset UV relays at MCC C and MCC D.
o Manually start 'one fan as power supply permits (23 kw)
- d. Verify Attachment SD-1 COMPLETE
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 22 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 27 Check If RCPs Must Be Stopped:
a.
- ANY RUNNING b.
Check the following:
o RCP ¹1 seal D/P LESS THAN 220 PSID a.
Go to Step 28.
b.
Go to Step 28.
-OR-
" o RCP ¹1 seal leakoff -
LESS THAN 0.25 GPM c.
Stop affected RCP(s) 28 Check Condenser Steam Dump Available CONDENSER VACUUM GREATER THAN 20 INCHES HG Use intact S/G ARV for RCS temperature control.
29 Check If RHR Normal Cooling Can Be Established:
a.
RCS cold leg temperature LESS THAN 350'F
- a. Return to Step 1.
b.
RCS pressure LESS THAN 400 psig
[300 psig adverse CNMT]
c.
Place RCS overpressure protection system in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM) b.
Go to Step 30.
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ES-1.2 POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 23 of 23 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
This procedure should be continued while obtaining CNMT hydrogen sample in Step 30.
30 Check CNMT Hydrogen Concentration:
- b. Hydrogen concentration LESS THAN 0.5%
31 Check Core Exit T/Cs LESS THAN 200'F Return to Step l.
32 Evaluate Long Term Plant Status:
- a. Maintain cold shutdown conditions
- b. Consult TSC
-END-
EOP:
ES-1.2 ZI ALE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 1 of 1 ES-1.2 APPENDIX LIST TITLE 1 )
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
FIGURE SDM 4)
ATTACHMENT SEAL COOLING 5)
ATTACHMENT RCP START 6)
ATTACHMENT NC 7)
ATTACHMENT D/G STOP 8)
ATTACHMENT SD-1 9)
ATTACHMENT SD-2 10)
ATTACHMENT SI/UV 11)
ATTACHMENT N2 PORVS 12)
ATTACHMENT RHR COOL 13)
ATTACHMENT AUX BLDG SW 14)
FOLDOUT PAGES
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ES-1.2 POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 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 434
[464 adverse CNMT) c.
HEAT SINK Narrow range level in all S/Gs less than 5%
[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
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ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 1 of 1
FIGURE MIN SUBCOOLING NOTE:
Subcooling Margin = Saturation Temperature From Figure Below '[-] 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 E CNHT NORMAL CNNT INADE(UATE SUBCOOL ING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE (')
EOP:
ES-1.2 TITLE:
POST"LOCA COOLDOWN AND DEPRESSURIZATION REV 12 PAGE 1 of 1 FIGURE SDM NOTE:
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 PPM 1400 1200 1000 ADEQUATE SDM 100 PPH CONSERVATISH INCLUDED 800 600 400 BORA 200 BURNUP INCREMENTS 100 HWD/HTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 CYCLE 24 BURNUP (HWD/HTU)
EOP:
ES-1.2 TITLE:
POST LOCA COOLDOWN AND DEPRESSURIZATION REV:
12 PAGE 1 of 1
FOLDOUT PAGE 1.
SI REINITIATION CRITERIA IF EITHER condition listed below occurs, THEN manually operate SI pumps as necessary:
o RCS subcooling based on core exit T/Cs LESS THAN O'F USING FIGURE MIN SUBCOOLING OR o
PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 54
[30% adverse CNMT]
2.
SI TERMINATION CRITERIA IF ALL conditions listed below occur, THEN go to ES-l.l, SI TERMINATION, Step 1:
a.
RCS subcooling based on core exit T/Cs GREATER THAN O'F USING FIGURE MIN SUBCOOLING
- b. Total feed flow to intact S/Gs GREATER THAN 200 GPM OR Narrow range level in at least one intact S/G GREATER THAN 54
[25% adverse CNMT]
c.
RCS pressure:
o GREATER THAN 1625 PSIG
[1825 psig adverse CNMT]
o STABLE OR INCREASING d.
PRZR level GREATER THAN 54
[30% adverse CNMT]
3.
SECONDARY INTEGRITY CRITERIA IF any S/G pressure is decreasing in an uncontrolled manner or is completely depressurized AND has not been isolated, THEN go to E-2, FAULTED S/G ISOLATION, Step 1.
4.
COLD LEG RECIRCULATION SWITCHOVER CRITERION IF RWST level decreases to less than 284, THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.
5.
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).
6.
E-3 TRANSITION CRITERIA IF any S/G level increases in an uncontrolled manner or any S/G has abnormal radiation, THEN go to E-3, STEAM GENERATOR TUBE RUPTURE, Step l.
I'
ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATXON OF BOTH STEAM GENERATORS REV:
14 PAGE 1 of 31 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER RESPONSIBLE AGER EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 2 of 31 A.
PURPOSE This procedure provides actions to mitigate and minimize a loss of secondary coolant from both steam generators.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
ENTRY CONDITIONS This procedure is entered from:
a.
E-2, FAULTED STEAM GENERATOR ISOLATION, when an uncontrolled depressurization of both steam generators occurs.
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV',14 PAGE 3 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF THE TDAFW PUMP IS THE ONLY AVAILABLESOURCE OF FEED FLOW.,
THEN STEAM SUPPLY TO THE TDAFW PUMP MUST BE MAINTAINED FROM ONE S/G.
L NOTE:
o FOLDOUT page should be open AND monitored periodically.
o Conditions should be evaluated for Site Contingency Reporting (Refer to EPIP 1-0, GINNA STATION EVENT EVALUATION AND CLASSIFICATION).
Adverse CNMT values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+
R/hr.
1 Check Secondary Pressure Boundary:
o MSIVs -
CLOSED o
MFW flow control valves CLOSED
~ MFW regulating valves
~ MFW bypass valves o
MFW pump discharge valves CLOSED Manually close valves one loop at a time IF valves can NOT be closed, THEN dispatch AO to locally isolate flowpaths, as necessary, one loop at a time.
o S/G blowdown and sample valves CLOSED o
TDAFW pump steam supply valves PULL STOP o
TDAFW pump flow contxol valves CLOSED o
S/G ARVs -
CLOSED o
Dispatch AO to locally isolate S/Gs (Refer to Attachment FAULTED S/G)
EOP:
ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 4 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION A MINIMUM FEED FLOW OF 50 GPM MUST BE MAINTAINED TO EACH S/G WITH A NARROW RANGE LEVEL LESS THAN 5%
[25% ADVERSE CNMT].
2 Control Peed Plow To Minimize RCS Cooldown:
a.
Check cooldown rate in RCS cold legs LESS THAN 100'F/HR b.
Check narrow range level in both S/Gs
- LESS THAN 50%
c.
Check RCS hot leg temperatures STABLE OR DECREASING a.
Decrease feed flow to 50 gpm to each S/G and go to Step 2c.
- b. Control feed flow to maintain narrow range level less than 50%
in both S/Gs.
- c. Control feed flow or dump steam to stabilize RCS hot leg temperatures.
3 Check If RCPs Should Be Stopped:
a.
RCP status
- ANY RCP RUNNING
- b. SI pumps
- AT LEAST TWO RUNNING c.
RCS pressure minus maximum S/G pressure
- LESS THAN 175 psig
[400 psig adverse CNMT]
- d. Stop both RCPs a.
Go to Step 4.
b.
Go to Step 4.
c.
Go to Step 4.
EOP:
ECA-2. 1 T!TLE UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 5 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 4 Check CST Level - GREATER THAN 5 FEET Switch to alternate AFW suction supply (Refer to ER-AFW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).
CAUTION IF ANY PRZR PORV OPENS BECAUSE OF HIGH PRZR PRESSURE, IT SHOULD BE CLOSED AFTER PRESSURE DECREASES TO LESS THAN 2335 PSIG (REFER TO STEP 5B).
- 5 Monitor PRZR PORVs And Block Valves:
a.
Power to PORV block valves AVAILABLE b.
PORVs CLOSED
- a. Restore power to block valves unless block valve was closed to isolate an open PORV:
~ MOV-515, MCC D position 6C
~ MOV-516, MCC C position 6C
- b. IF PRZR pressure less than 2335 psig, THEN manually close PORVs.
- c. Block valves
- AT LEAST ONE OPEN IF any PORV can NOT be closed, THEN manually close its block valve.
IF block valve can NOT be closed, THEN dispatch AO to locally check breaker.
~ MOV-515, MCC D position 6C
~ MOV-516, MCC C position 6C c.
Open one block valve unless it was closed to isolate an open PORV.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 6 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6
Check Secondary Radiation Levels - NORMAL o
Steamline radiation monitor (R-31 and R-32) o Dispatch AO to locally check steamline radiation Go to E-3, STEAM GENERATOR TUBE
- RUPTURE, Step l.
o Request RP sample S/Gs for activity CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET, THEN SELECTED SW PUMPS AND ONE CCW PUMP WILL AUTO START ON EMERGENCY D/G.
MANUAL ACTION WILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.
7 Reset SZ
n
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 7 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION RCS PRESSURE SHOULD BE MONITORED.
IF RCS PRESSURE DECREASES TO LESS THAN 250 PSIG
[465 PSIG ADVERSE CNMTj, THEN. THE RHR PUMPS MUST BE MANUALLYRESTARTED TO SUPPLY WATER TO THE RCS.
- 8 Monitor If RHR Pumps Should Be Stopped:
.a.
RHR pumps
- ANY RUNNING b.
Check RCS Pressure:
a.
Go to Step 9.
- 1) Pressure GREATER THAN 250 psig
[465 psig adverse CNMT]
- 2) Pressure
- STABLE OR INCREASING 1)
Go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT, Step l.
2)
Go to Step 9.
c, Stop RHR pumps and place in AUTO
It
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 8 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 9 Monitor If CNMT Spray Should Be Stopped:
a.
CNMT spray pumps
- RUNNING b.
Check the following:
o CNMT pressure LESS THAN 4 PSIG a.
Go to Step 10.
- b. Continue with Step 10.
WHEN BOTH conditions satisfied, THEN do Steps 9c through f.
o Sodium hydroxide tank level-LESS THAN 55%
- c. Reset CNMT spray d.
Check NaOH tank outlet valves CLOSED
~ AOV-836A
~ AOV-836B
- d. Place NaOH tank outlet valve controllers to MANUAL and close valves.,
~ AOV-836A
~ AOV-836B e.
Stop CNMT spray pumps and place in AUTO
- f. Close CNMT spray pump discharge valves
~ MOV-860A
~ MOV-860B
~ MOV-860C
~ MOV-860D
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ECA-2.1 T1Tt.E UNCONTROLLED DEPRESSURXZATZON OF BOTH STEAY, GENERATORS REV 14 PAGE 9 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 10 Check EST Level - GREATER THAN 284 Go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.
ll Reset CI:
a.
Depress CI reset pushbutton
- b. Verify annunciator A-26, CNMT ISOLATION - EXTINGUISHED
- b. Perform the following:
- 1) Reset SI.
- 2) Depress CI reset pushbutton.
12 Verb.fy Adequate SW Plow:
a, Check at least two SW pumps RUNNING
- b. Dispatch AO to establish normal shutdown alignment (Refer to Attachment SD-1)
- a. Manually start SW pumps as power supply permits (258 kw each).
IF less than two SW pumps
- running, THEN perform the following:
- 1) Ensure SW isolation.
- 2) Dispatch AO to establish normal shutdown alignment (Refer to Attachment SD-1) 3)
Go to Step 14.
U
EOP:
ECA-2.1 tlTLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH.,STEAM GENERATORS REV'4 PAGE 10 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Establish IA to CNMT:
- a. Verify non-safeguards busses energized from offsite power o
Bus 13 normal feed CLOSED
-OR-o Bus 15 normal feed CLOSED
- b. Verify SW isolation valves to turbine building -
OPEN
~ MOV-4613 and MOV-4670
~ MOV-4614 and" MOV-4664
- c. Verify at least two air compressors
- RUNNING d.
Check IA supply:
o Pressure
- GREATER THAN 60 PSIG o
Pressure
- STABLE OR INCREASING
OPEN a.
Perform the following:
- 1) Close non-safeguards bus tie breakers:
~ Bus 13 to Bus 14 tie
~ Bus 15 to Bus 16 tie
- 2) Verify adequate emergency D/G capacity to run air compressors (75 kw each).
IF NOT, THEN evaluate if CNMT RECIRC fans should be stopped (Refer to Attachment CNMT RECIRC FANS).
3)
WHEN bus 15 restored, THEN reset control room lighting.
- b. Manually align valves.
'c. Manually start air compressors as power supply permits (75 kw each).
IF air compressors can NOT be started, THEN dispatch AO to locally reset compressors as necessary.
- d. Perform the following:
- 1) Continue attempts to restore IA (Refer to AP-IA.1, LOSS OF INSTRUMENT AIR).
- 2) Continue with Step 14, WHEN IA restored, THEN do Steps 13e and f.
EOP:
ECA-2.1 TITLE UNCONTROLLED DEPRESSURIZATION OF BOTH STEAN GENERATORS REV:
14 PAGE 11 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 14 Check If SI ACCUMs Should Be Isolated:
- a. Both RCS hot leg temperatures LESS THAN 400'F a'.
Go to Step 15.
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ MOV-841
~ MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs,
- d. Locally reopen breakers for MOV-841 and MOV-865
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
15 Check Normal Power Available To Charging Pumps:
~
o Bus 14 normal feed breaker CLOSED o
Bus 16 normal feed breaker-CLOSED Veri'fy adequate emergency D/G capacity to run charging pumps (75 kw each).
IF NOT, THEN evaluate if CNMT RECIRC fans can be stopped (Refer to Attachment CNMT RECIRC FANS).
EQP:
ECA-2.1 TITLE UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 12 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 16 Check If Charging Plow Has Been Established:
- a. Charging pumps
- ANY RUNNING a,
Perform the 'following:
- 1) IF CCW flow is lost to any RCP thermal barrier OR any RCP ¹1 seal outlet temperature offscale high, THEN dispatch AO with key to RWST gate to close seal injection needle valve(s) to affected RCP:
~ RCP A, V-300A
~ RCP B, V-300B
- 2) Ensure HCV-142 open, demand at Oa.
- b. Al'ign charging pump suction to RWST' LCV-112B -
OPEN o
.LCV-112C -
CLOSED
- b. IF LCV-112B can NOT be opened, THEN perform the following:
- 1) Verify charging pump A NOT running and place in PULL STOP.
- c. Start charging pumps as necessary and adjust charging flow to restore PRZR level
- 2) Dispatch AO to locally open manual charging pump suction from RWST (V-358 located in charging pump room).
3)
WHEN V-358 open, THEN direct AO to close V-268 to isolate charging pumps B and C from VCT (V-268 located in charging pump room).
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV'. '4 PAGE 13 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 17 Monitor SI Termination Criteria:
a.
SI pumps
- ANY RUNNING b.
Check RCS pressure:
o Pressure
- GREATER THAN 1625 psig (1825 psig adverse CNMT]
o Pressure STABLE OR INCREASING c.
RCS subcooling based on core exit: T/Cs GREATER THAN O' USING FIGURE MIN SUBCOOLING a.
Go to Step 19.
b.
DO NOT stop SI pumps.
- Perform, the following:
- 1) Energize PRZR heaters and operate PRZR spray as necessary to stabilize RCS pressure greater than 1625 psig (1825 psig adverse CNMT]
- 2) Return to Step 2.
c., DO NOT stop SI pumps.
Return to Step 2.
d.
PRZR level - GREATER THAN 5%
[30% adverse CNMT]
d.
Do NOT stop SI pumps.
Perform the following:
- 1) IF normal PRZR spray available, THEN try to stabilize RCS pressure with PRZR spray.
- 2) Return to Step 17a.
NOTE:
Foldout Page E-2 transition'criteria does not: apply while performing steps 18 and 19.
18 Stop SZ and RHR Pumps And Place Zn Auto
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 14 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- 19 Monitor SZ Reinitiation Criteria:
a.
RCS subcooling based on core exit T/Cs
- GREATER THAN O' USING FIGURE MIN SUBCOOLING
- a. Manually operate SI pumps as necessary and return to Step 2.
b.
PRZR level - GREATER THAN 5%
[30% adverse CNMT)
- b. Control charging flow to maintain PRZR level.
IF PRZR level can NOT be maintained, THEN manually operate SI pumps as necessary and return to Step 2.
20 Check RCS Hot Leg Temperatures
- STABLE OR DECREASZNG Control feed flow or dump steam'o stabilize RCS hot leg temperatures.
21 Check Narrow Range Level Zn Both S/Gs - LESS THAN 504 Control feed flow to maintain narrow range level less than 50$ in both S/Gs.
22 Verify Adecpxate'W Plow To CCN Hz
~ MOV-4615 and'OV-4734
~ MOV-4616 and MOV-4735
- a. Manually start pumps as power supply permit's (258 kw per pump).
IF less than two SW pumps can be operated, THEN go to Step 28.
- c. Verify CNMT RECIRC fan annunciator C-2, HIGH TEMPERATURE ALARM - EXTINGUISHED
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEZdf GENERATORS REV:
14 PAGE 15 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 23 Check If Normal CVCS Operation Can Be Established
- a. Verify IA restored:
OPEN
- a. Continue with Step 28.
WHEN IA
- restored, THEN do Steps 23 through 27.
o IA pressure GREATER THAN 60 PSIG
- b. Verify instrument bus D-ENERGIZED c.
CCW pumps
- ANY RUNNING
- b. Energize MCC B.
IF MCC B NOT available, THEN perform the following:
- 1) Verify MCC A energized.
- 2) Place instrument bus D on maintenance supply.
- c. Perform the following:
- 1) IF any RCP ¹1 seal outlet temperature offscale high, THEN isolate CCW to thermal barrier of affected RCP(s).
~ RCP'A, MOV-749A and MOV-759A
~ RCP B, MOV-749B and MOV-759B
- d. Charging pump - ANY RUNNING
- 2) Manually start one CCW pump.
- d. Continue with Step 28."
WHEN any charging pump running, THEN do Steps 24 through 27.
I
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 16 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 24 Veri.fy'PRZR Level - GREATER THAN 134
[404 adverse CNMT]
Continue with Step 26.
WHEN PRZR level increases to greater than 13%
[40% adverse CNMT], THEN do Step 25.
25 Establi.sh Normal Letdown:
- a. Verify charging line flow to REGEN Hx -
GREATER THAN 20 GPM b, Place the following switches to CLOSE' Letdown orifice valves (AOV-200A, AOV-200B, and AOV-202)
~ AOV-371, letdown isolation valve
~ AOV-427, loop B cold leg to REGEN Hx
- c. Place letdown controllers in MANUAL at 40% open
~ TCV-130
~ PCV-135
- d. Reset both trains of XY relays for AOV-371 and AOV-427 e.
Open AOV-371 and AOV-427
- f. Open letdown orifice valves as necessary
- g. Place TCV-130 in AUTO at 105'F
- h. Place PCV-135 in AUTO at 250 psig
- i. Adjust charging pump speed and HCV-142 as necessary IF RCP seal return has been established, THEN establish excess letdown as follows:
o Place excess letdown divert
- valve, AOV-312, to NORMAL.
o Ensure CCW from excess letdown
- open, (AOV-745)
~
o Open excess letdown isolation valve AOV-310.
o Slowly open HCV-123 to maintain excess letdown temperature less than 195'F and pressure less than 100 psig.
o Adjust charging pump speed as necessary.
IF RCP seal return NOT established, THEN consult TSC to determine if excess letdown should be placed in service.
EOP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 17 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 26 Check VCT Makeup System:
- a. Adjust boric acid flow control valve in AUTO to 9.5 gpm
- b. Adjust RMW flow control valve in AUTO to 40 gpm
- c. Verify the following:
1)
RMW mode selector switch in AUTO
- c. Adjust controls as necessary.
4 2)
RMW control armed RED LIGHT LIT d.
Check VCT level:
o Level -
GREATER THAN 20%
-OR-o Level -
STABLE OR INCREASING
- d. Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and RMW pumps running.
IF NOT, THEN reset MCC C and MCC D UV lockouts as necessary.
- 2) Place RMW flow control valve HCV-ill in MANUAL and increase RMW flow.
- 3) Increase boric acid flow as necessary.
~ '
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 18 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 27 Check Charging Pump Suction Aligned To VCT:
a.
VCT level
- GREATER THAN 20%
- a. IF VCT level can NOT be maintained greater than 5%,
THEN perform the following:
~
- 1) Ensure charging pump suction aligned to RWST o
LCV-112B open o
LCV-112C closed
- 2) Continue with Step 28.
WHEN VCT level greater than 40%,
THEN do Step 27b
- b. Verify charging pumps aligned to
- b. Manually align valves as VCT:
necessary.
o LCV-112C -
OPEN o
LCV-112B -
CLOSED
EOP:
ECA-2 ~ 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 19 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 28 Check RCP Cooli.ng:
a.
Establish normal cooling to RCPs (Refer to Attachment SEAL COOLING).
o Annunciator A-7, RCP lA CCW RETURN HIGH TEMP OR LOW FLOW EXTINGUISHED o
Annunciator A-15, RCP 1B CCW RETURN HIGH TEMP OR LOW FLOW EXTINGUISHED b.
Check RCP seal injection:
o Labyrinth seal D/Ps GREATER THAN 15 INCHES OF WATER
-OR-o RCP seal injection flow to each RCP
- GREATER THAN 6 GPM
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV'4 PAGE 20 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 29 Check Zf Seal Return Flow Should Be Established:
- a. Verify RCP ¹1 seal outlet temperature LESS THAN 235'F
- b. Verify RCP seal outlet valves OPEN
~ AOV-270A
~ AOV-270B a.
Go to Step 30.
- b. Manually open valves as necessary.
- c. Reset both trains of XY relays for RCP seal return isolation valve MOV-313 d.
Open RCP seal return isolation valve MOV-313
- d. Perform the following:
- 1) Place MOV-313 switch to OPEN.
- e. Verify RCP ¹1 seal leakoff flow LESS THAN 6.0 GPM
- 1) Trip the affected RCP
- 2) Allow 4 minutes for pump coast
- down, THEN close the affected RCP seal discharge valve
- f. Verify RCP ¹1 seal leakoff flow GREATER THAN 0.8 GPM
~ RCP A, AOV-270A
~ RCP B, AOV-270B IF both RCP seal discharge valves are shut, THEN go to Step 30.
- f. Refer to AP-RCP.l, RCP SEAL MALFUNCTION.
l I
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURZZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 21 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
. NOTE:
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
o When using PRZR PORV, select one with an operable block valve.
30 Energize Heaters And Operate Normal Spray As Necessary To Maintain RCS Pressure Stable IF normal spray NOT available and letdown is in service, THEN use auxiliary spray valve (AOV-296).
IF PRZR spray NOT available, THEN use one PRZR PORV.
IF IA NOT available, THEN refer to Attachment N2 PORVS.
S f
N
)
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ECA-2.1 TlTLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 22 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 31 Verify All AC Busses-ENERGIZED BY OFFSITE POWER o
Normal feed breakers to all 480 volt busses CLOSED Perform the following:
- a. IF any AC emergency bus normal feed breaker
- open, THEN ensure associated D/G breaker closed.
o 480 bus voltage GREATER THAN 420'OLTS o
Emergency D/G output breakers-OPEN
- b. Perform the following, as necessary:
- 1) Close non-safeguards bus tie breakers:
~ Bus 13 to Bus 14 tie
~ Bus 15 to Bus 16 tie
- 2) Place the following pumps in PULL STOP:
~ EH pumps
~ Turning gear oil pump
~ HP seal oil backup pump
- 3) Restore power to MCCs.
~ A from Bus 13
~ B from Bus 15
~ E from Bus 15
~ F from Bus 15 4)
WHEN bus 15 restored, THEN reset control room lighting.
- 5) Refer to Attachment SI/UV for other equipment lost with loss of offsite power.
- c. Try to restore offsite power to all AC busses (Refer to ER-ELEC.1, RESTORATION OF OFFSITE POWER).
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 23 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST, THEN THE AFFECTED RCP SHOULD NOT BE STARTED PRIOR TO A STATUS EVALUATION.
32 Check RCP 'Status - AT LEAST ONE RUNNING'ryto start one RCP:
- a. Establish conditions for starting an RCP.
o Bus 11A or 11B energized o
Refer to Attachment RCP START.
- b. Start one RCP.
IF an RCP can NOT be started, THEN verify natural circulation (Refer to Attachment NC).
IF natural circulation can NOT be
- verified, THEN increase feed flow or dumping steam.
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ECA-2 ~ 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 24 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Adverse CNMT conditions or loss of forced air cooling may result in failure of NIS detectors.
33 Check If Source Range
,Detectors Should Be Energized:
a.
Source range channels DEENERGIZED
- a. Go'to Step 33e.
b.
Check intermediate range flux-EITHER CHANNEL LESS THAN 10 10 AMPS
- b. Perform the following:
- 1) IF neither intermediate range channel is decreasing THEN initiate boration.
- 2) Continue with Step 34.
WHEN flux is LESS THAN 10 amps on any operable
- channel, THEN do Steps
- 33c, d and e.
c.
Check the following:
o Both intermediate range channels
- LESS THAN 10 10 AMPS
- c. Continue with step 34.
WHEN either condition met, THEN do Steps 33d and e.
-OR-o Greater than 20 minutes since reactor trip d, Verify source range detectors ENERGIZED
- d. Manually energize source range detectors by depressing P-6 permissive defeat pushbuttons (2
of 2).
IF source ranges can NOT be
- restored, THEN refer to ER-NIS.1, SR MALFUNCTION and go to Step 34.
- e. Transfer Rk-45 recorder to one source range and one intermediate range channel.
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COP:
ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 25 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 34 Check IX Emergency D/Gs Should Be Stopped:
- a. Verify AC emergency busses energized by offsite power:
o Emergency D/G output breakers OPEN
- a. Try to restore offsite power (Refer to ER-ELEC.l, RESTORATION OF OFFSITE POWER).
o AC emergency bus voltage GREATER THAN 420 VOLTS o
AC emergency bus normal feed breakers CLOSED
- b. Stop any unloaded emergency D/G and place in standby (Refer to Attachment D/G STOP)
h
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C
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 26 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 35 Establish Normal Shutdown Alignment:
a.
Check condenser
- AVAILABLE
- a. Dispatch AO to perform Attachment SD-2.
- b. Perform the following:
o Open generator disconnects
~ 1013A71
~ 9X13A73 o
Place voltage regulator to OFF o
Open turbine drain valves o
Rotate reheater steam supply controller cern to close valves o
Place reheater dump valve switches to HAND o
Stop all but one condensate pump
- c. Verify adequate Rx head cooling:
- 1) Verify at least one control rod shroud fan - RUNNING
- 2) Verify one Rx compartment cooling fan - RUNNING
- 1) Manually start one fan as power supply permits (45 kw)
- 2) Perform the following:
o Dispatch AO to reset UV relays at MCC C and MCC D.
o Manually start one fan as power supply permits (23 kw)
- d. Verify Attachment SD COMPLETE
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ECA-2. 1 TITLE UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 27 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 36 Maintain Plant Conditions-STABLE Control plant systems as necessary to maintain conditions stable.
o RCS pressure o
PRZR level o
RCS temperatures
- 37 Monitor SI Reinitiation Criteria:
a.
RCS subcooling based on core exit T/Cs GREATER THAN O' USING FIGURE MIN SUBCOOLING
- a. Manually operate SI pumps as necessary.
Return to Step 2.
b.
PRZR level
- GREATER THAN 5%
[30% adverse CNMT]
- b. Control charging flow to maintain PRZR level.
IF PRZR level can NOT be maintained, THEN manually operate SI pumps as necessary.
Return to Step 2.
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ECA-2 ~ 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 28 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 38 Check IZ SI ACCUMs Should Be Isolated:
a.
Check the following:
o RCS subcooling based on core exit T/Cs'-
GREATER THAN O' USING FIGURE MIN SUBCOOLING a.
Go to Step 39.
o PRZR level - GREATER THAN 5%
[30% adverse CNMT]
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ MOV-841
~ MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
- d. Locally reopen breakers for MOV-841 and MOV-865
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 29 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 39 Check RCS Hot Leg Control feed flow and dump steam to Temperatures - LESS THAN 350'P establish RCS cooldown rate less than 100'F/hr in RCS cold legs.
NOTE:
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
o When using PRZR PORV, select one with operable block valve.
40 Check RCS Pressure - LESS THAN 400 PSIG
[300 PSIG adverse CNMT]
.Use normal PRZR spray.
IF normal spray NOT available and letdown is in service, THEN use auxiliary spray.
IF NOT, THEN use one PRZR PORV.'F IA NOT available, THEN refer to Attachment N2 PORVS.
TI
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 30 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 41 Check Xf RHR Normal Cooling Can Be Establishel:
a.
RCS cold leg temperature LESS THAN 350'F
- a. Return to Step 37.
b.
RCS pressure
- LESS THAN 400 psig (300 psig adverse CNMT]
- c. Place letdown pressure controller (PCV-135) in MANUAL CLOSED
- b. Return to Step 40 Check following valves OPEN
~ AOV-371, letdown isolation valve
~ AdV-427, loop B cold leg to REGEN Hx
~ At least one letdown orifice valve (AOV-200A, AOV-200B, or AOV-202)
- d. Perform the following:
- 1) Reset both trains of XY relays for AOV-371 and AOV-427.
- 2) Open AOV-371 and AOV-427.
- 3) Open one letdown orifice valve.
- e. Verify pressure on PI-135
- LESS THAN 400 PSIG
- e. Return to Step 40.
- f. Place RCS overpressure protection system in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
- f. IF RCS overpressure protection system can NOT be placed in
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ECA-2.1 EITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 31 of 31 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 42 Continue RCS Cooldovn To Cold Shutdown:
- a. Maintain cooldown rate in RCS cold legs LESS THAN 100'F/HR b.
Check narrow range level in both S/Gs
- LESS THAN 50%
- b. Control feed flow to maintain narrow range level. less than 50%
in both S/Gs.
43 Check Core Exit T/Cs. - LESS THAN 200'P Return to Step 42.
44 Evaluate Long Term Plant Status:
- a. Maintain cold shutdown conditions
- b. Consult TSC
-END-
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T!TLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
14 PAGE 1 of 1 ECA-2.1 APPENDIX LIST TITLE 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
ATTACHMENT FAULTED S/G 4)
ATTACHMENT CNMT RECIRC FANS 5)
ATTACHMENT NC 6)
ATTACHMENT RCP START 7)
ATTACHMENT N2 PORVS 8)
ATTACHMENT SEAL COOLING 9)
ATTACHMENT SI/UV.
10)
ATTACHMENT D/G STOP 11)
ATTACHMENT SD-1 12)
ATTACHMENT SD-2 13)
ATTACHMENT RHR COOL 14)
ATTACHMENT AUX BLDG SW 15)
FOLDOUT PAGES
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ECA-F 1 T1TLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 14 PAGE 1 of 1 RED PATH
SUMMARY
a ~
b.
c ~
d.
e.
SUBCRITICALITY Nuclear power greater than 54 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 434
[464 adverse CNMT]
HEAT SINK Narrow range level in all S/Gs less than 54
[254 adverse CNMT] AND total feedwater flow less than 200 gpm INTEGRITY Cold leg temperatures decrease greater than 100'F in last 60 minutes AND RCS cold leg temperature less than 285'F CONTAINMENT - CNMT pressure greater than 60 psig
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS N
REV 14 PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE:. Subcooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C'ndication RC 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0
S PRESSURE (PSIG)
RCS PRESSURE INCREMENTS 20 PSIG SUBCOOLED REGION ADVERSE CNHT NORMAL CNMT INADEQUATE SUBCOOLING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATXON OF BOTH STEAM GENERATORS REV 14 PAGE 1 of 1 FOLDOUT PAGE 1.
SI REINITIATION CRITERIA Manually operate SI pumps as necessary if EITHER condition listed below occurs:
o RCS subcooling based on core exit TCs LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING o
PRZR level CHARGING CAN. NOT CONTROL LEVEL GREATER THAN 5%
[30% ADVERSE CNMT]
2.
E-2 TRANSITXON CRITERIA IF any S/G pressure increases at any time (except while performing SI termination in Steps 18 and 19),
THEN go to E-2, FAULTED STEAM GENERATOR ISOLATIONi Step 1.
3.
COLD LEG RECIRCULATION SWITCHOVER CRITERION IF RWST level decreases to less than 28%,
THEN go to ES-1.3, TRANSFER TO COLD LEG RECXRCULATION, Step l.
4.
LOSS OF EMERGENCY COOLANT RECIRCULATION CRITERION XF emergency coolant recirculation is established and subsequently lost, THEN go to ECA-1.1, LOSS OF EMERGENCY COOLANT RECIRCULATION, Step 1.
5.
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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