ML17250B119
| ML17250B119 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/09/1990 |
| From: | Widay J ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17250B096 | List:
|
| References | |
| ES-3.1, NUDOCS 9004200712 | |
| Download: ML17250B119 (28) | |
Text
EOP:
ES-3.1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REVS 3
PAGE 1 of 9 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE P
NT SUPERIN EN ENT
<f~ /
'~
EFFECTIVE DATE QA NON-QA CATEGORY 1.0 REVIEWED BY:
, 90042007i2 9004i0
,PDR ADOCK 05000244 p
PNU 5
'i ~
~I I
T'ai
r
EOP:
ES-3.1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 2 of 9 A.
PURPOSE This procedure provides actions to cool down and depressurize the plant to cold shutdown conditions following a SGTR.
This recovery method depressurizes the ruptured S/G by draining it through the ruptured S/G tubes into the RCS.
B.
ENTRY CONDITIONS/SYMPTOMS l.
ENTRY CONDITIONS This procedure is entered from:
a.
E-3 STEAM GENERATOR TUBE RUPTURE, if plant staff selects backfill method.
b ~
ES 3
~ 2 g POST SGTR COOLDOWN USING BLOWDOWNg when blowdown is not available and plant staff selects backfill method.
EOP:
ES-3. 1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REV:
3 PAGE 3 of 9 STEP ACTION/EXPECTED RESPONSE-
RESPONSE
NOT OBTAINED
/
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 Energize PRZR Heaters As Necessary To Saturate PRZR Water At Ruptured S/G Pressure 2
Check If 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 o
PRZR level - GREATER THAN 5X
[30X adverse CNMT]
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM outlet valves
~ ACCUM A, MOV-841
~ ACCUM B, MOV-865
- d. Locally reopen breakers for MOV-841 and MOV-865 a.
Go to ECA-3.1, SGTR VITH LOSS OF REACTOR COOLANT -
SUBCOOLED RECOVERY DESIRED, Step 1.
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
V
fOP:
ES-3. 1 TjTLf:
POST-SGTR COOLDOWN USING BACKFILL REV:
3 PAGE 4 of 9 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Leakage from ruptured S/G into RCS will dilute RCS boron concentration.
3 Verify Adequate Shutdown Margin
- b. Borate as necessary.
- b. Verify boron concentration-GREATER THAN REQUIREMENTS OF FIGURE SDM 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).
NOTE:
TDAFW pump flow control valves fail open on loss of IA.
4 Check Intact S/G Level:
- a. Narrow range level - GREATER THAN 5X [25X adverse CNMT]
- b. Control feed flow to maintain narrow range level between 17X
[25X adverse CNMT] and 50X
- a. Maintain total feed flow greater than 200 gpm until narrow range level greater than 5X [25X adverse CNMT] in the intact S/G.
- b. IF narrow range level in the intact S/G continues to increase in an uncontrolled
- manner, THEN go t'o ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT -
SUBCOOLED RECOVERY DESIRED, Step 1.
EOP:
ES-3.1 POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 5 of 9 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Since ruptured S/G may continue to depressurize to less than the minimum RCS pressure necessary for continued RCP operation, cooldown to cold shutdown should be completed as quickly as possible, not to exceed 100'F/hr.
5 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
- c. Manually or locally dump steam using intact S/G ARV.
IF no intact S/G available and RHR system NOT in service, THEN perform the following:
o Use faulted S/G.
-OR-o Go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT-SUBCOOLED RECOVERY DESIRED, Step l.
EOP:
ES-3.1 POST-SGTR COOLDOWN USING BACKFILL REV:
3 PAGE 6 of 9 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6
Check Ruptured S/G Narrow Range Level GREATER THAN 174
[254 adverse CNMT]
Refill ruptured S/G to 67X [55X adverse CNMT] using feed flow.
IP either of the following conditions occurs, THEN stop feed flow to ruptured S/G:
o Ruptured S/G pressure decreases in an uncontrolled manner.
-OR-o Ruptured S/G pressure increases to 1020 psig.
7 Control RCS Makeup Flow And Letdown To Maintain PRZR Level:
a.
PRZR level - GREATER THAN 13%
[40X adverse CNMT]
b.
PRZR level - LESS THAN 75X [65X adverse CNMT]
- a. Increase RCS makeup flow as necessary and go to Step 8.
- b. Decrease RCS makeup flow to decrease level and go to Step 10.
EOP:
ES-3.1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 7 of 9 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
The upper head region may void during RCS depressurization if RCPs are not running.
This may result in a rapidly increasing PRZR level.
8 Depressurize RCS To Backfill From Ruptured S/G:
- a. Depressurize using normal PRZR spray
- a. IP letdown is in service, THEN depressurize using auxiliary spray valve (AOV-296). IP NOT, THEN use one PRZR PORV.
- b. Maintain PRZR level - BETWEEN 13X AND 75X
[BETWEEN 40X AND 65X adverse CNMT]
c.
Check ruptured S/G level-GREATER THAN 5X [25X adverse
'CNMT]
- d. Energize PRZR heaters as necessary
- e. Maintain RCS subcooling based on core exit T/Cs - GREATER THAN O'F USING FIGURE MIN SUBCOOLING
- c. Stop RCS depressurization.
9 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 Or 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT)
P i"
t, fl
EOP:
ES-3.1 POST-SGTR COOLDOWN USING BACKFILL REV:
3 PAGE 8'of 9
STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 10 Check If RHR Normal Cooling Can Be Established:
a.
RCS cold leg temperature
- LESS THAN 350'F a.
Go to Step 11.
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)
Go to Step 11.
- c. IF RCS overpressure protection system can NOT be placed in
11 Check If RCPs Must Be Stopped:
a.
RCPs - ANY RUNNING b.
Check the folloving:
o RCP gl seal D/P - LESS THAN 220 PSID a.
Go to Step 12.
b.
Go to Step 12.
-OR-o Check RCP seal leakage
- LESS THAN 0.25 GPM
- c. Stop affected RCP(s) 12 Check Core Exit T/Cs LESS THAN 200'F Return to Step 3.
ES-3.1 POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 9 of 9 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Evaluate Long Term Plant Status:
- a. Maintain cold shutdown conditions (Refer to 0-2.3, PLANT AT COLD OR REFUELING SHUTDOWN)
- b. Consult TSC
-END-
EOP:
ES-3.1 POST-SGTR COOLDONN USING BACKFILL REV:
3 PAGE 1 of 1
ES-3.1 APPENDIX LIST TITLE 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
FIGURE SDM 4)
ATTACHMENT RHR COOL 5)
FOLDOUT PAGES
EOP:
ES-3. 1 POST-SGTR COOLDOWN USING BACKFILL REV:
3 PAGE 1 of 1 RED PATH
SUMMARY
a.
SUBCRITICALITY Nuclear power greater than 5%
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:
[464 adverse CNMT]
c.
HEAT SINK Narrow range level in all S/Gs less than 54
[254 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
0
EOP:
ES-3.1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REV 3
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 ADVERSE CNMT NORMAL CNMT INADEQUATE SUBCOOLING REGION TEMPERATURE INCREMENTS 10'P 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)
EOP:
ES-3.1 TITLE:
POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPM) 1800 1600 BORON INCREMENTS 20 PPM 1400 1200 ADEQUATE SDM 1000 800 600 400 BORATE 200 BURNUP INCREMENTS 100 MWD/MTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 CYCLE BURNUP (MUD/MTU)
NOTE: To obtain core burnup, use PPCS turn on code BURNUP.
0
EOP:
ES-3.1 POST-SGTR COOLDOWN USING BACKFILL REV 3
PAGE 1 of 1 FOLDOUT PAGE SI REINITIATION CRITERIA IF either condition listed below occurs, THEN operate SI pumps manually as necessary and go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT SUBCOOLED RECOVERY DESIRED, Step 1:
o RCS subcooling based on core exit T/Cs
LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING.
'OR 2 ~
o PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5~
[30~ adverse CNMT]
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.
3.
COLD LEG RECIRCULATION SWITCHOVER CRITERION 4.
IF RWST level decreases to less than 28<,
THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.
AFW SUPPLY SWITCHOVER CRITERION IF CST level decreases to less than 5 feet, THEN switch to alternate AFW water supply (Refer to ER-AFW.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).