ML17262A896
| ML17262A896 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/06/1992 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17262A884 | List: |
| References | |
| AP-CVCS.1, NUDOCS 9206160408 | |
| Download: ML17262A896 (26) | |
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AP-CVCS.1 TITLE:
CVCS LEAK REV:
6 PAGE 1 of 12 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE PLANT'SUPERINTENDENT EF ECT VE DATE CATEGORY 1.0 REVIEWED BY:
920blb0408 920b05 PDR ADOCK 05000244 P
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AP-CVCS.1 CVCS LEAK REV 6
PAGE 2 of 12 A.
PURPOSE This procedure provides the necessary instructions to mitigate the consequences of a CVCS leak.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
ENTRY CONDITIONS This procedure is entered from; a.
AP-RCS.1, REACTOR COOLANT LEAK, when conditions indicate a
CVCS leak.
2.
SYMPTOMS The symptoms of CVCS leak are; a.
Annunciator B-9 (B-10),
RCP A(B) LABYR SEAL LO DIFF PRESS 15" H20, lit, or b.
Charging line pressure low, or c.
Annunciator F-14, CHARGING PUMP SPEED, lit, or d.
Annunciator A-4, REGEN HX LETDOWN OUT HI TEMP 395'F, lit, or e.
Letdown line low pressure and/or low flow, or f.
,Charging Pump Room area monitor R-4 on alarm.
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AP-CVCS.1 T!TLE:
CVCS LEAK REV:
6 PAGE 3 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF, AT ANY TIME DURING THIS PROCEDURE, A REACTOR TRIP OR SI OCCURS, E-O, REACTOR TRIP OR SAFETY INJECTION, SHALL BE PERFORMED.
NOTE:
o Conditions should be evaluated for site contingency reporting (Refer to EPIP-1.0, GINNA STATION EVENT EVALUATION AND CLASSIFICATION.
o A local radiation emergency should be declared for any unexplained area radiation monitor alarm.
1 Monitor PRZR Level STABLE AT PROGRAM LEVEL IF PRZR level decreasing, THEN start additional charging pumps and increase speed as necessary to stabilize PRZR level.
IF PRZR level continues to
- decrease, THEN close loop B cold leg to REGEN Hx isolation valve, AOV-427.
IF available charging pumps are running at maximum speed with letdown isolated, AND PRZR level is decreasing, THEN trip the reactor and go to E-O, REACTOR TRIP or SAFETY INJECTION.
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AP-CVCS.1 TITLE:
CVCS LEAK REV:
6 PAGE 4 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
IF VCT level decreases to 5%, charging pump suction will swap to the RWST.
This may require a load reduction.
2 Check VCT Makeup System:
- a. Verify the following:
1)
RMW mode selector switch in AUTO
- a. Adjust controls as necessary.
2)
RMW control armed RED LIGHT LIT b.
Check VCT level:
o Level GREATER THAN 20%
-OR-o Level -
STABLE OR INCREASING b.
Check letdown divert valve, LCV-112A, aligned to VCT.
Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and RMW pumps running.
- 2) Place RMW flow contxol valve, HCV-111, in MANUAL and increase RMW flow.
- 3) Increase boric acid flow as necessary.
IF VCT level can NOT be maintained, THEN refer to ER-CVCS.2, REACTOR MAKEUP CONTROL MALFUNCTION, if necessary.
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AP-CVCS.1 TITLE:
CVCS LEAK REV:
6 PAGE 5 of 12 STEP ACTIONEEXPECTED RESPONSE
RESPONSE
NOT OBTAINED 3
Check Charging Pump Suction Aligned To VCT:
a.
VCT 'level - GREATER THAN 20%
- a. IF VCT level can NOT be maintained greater than 5S, THEN perform the following:
- 1) Ensure 'charging pump suction aligned to RWST o
LCV-112B open o
LCV-112C closed
- 2) Continue with Step 4.
WHEN VCT level greater, than 20%,
THEN do Step 3b.
- b. Verify charging pumps aligned to VCT o
LCV-112C open o
LCV-112B closed b.'anually align valves as necessary.
4 Check Xf RCS Leakage In CNMT:
o Check CNMT radiation monitors NORMAL
~ R-2
~ R-7
~ R-10A
~ R-ll
~ R-12 o
CNMT sump A pump run frequency-NORMAL (Refer to leakage surveillance sheet)
IF leakage is indicated in CNMT, THEN perform the following:
- b. Continue with Step 5
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WHEN CNMT cleared for entry, THEN dispatch personnel to investigate CNMT for RCS leakage.
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AP-CVCS.1 TITLE CVCS LEAK REV:
6 PAGE 6 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION HEALTH PHYSICS TECHNICIAN SHOULD BE CONSULTED PRIOR TO ENTERING A HIGH AIRBORNE AREA.
5 Check If RCS Leakage In AUX BLDG:
a.
Check AUX BLDG radiation monitors NORMAL Dispatch AO To AUX BLDG To Investigate For CVCS Leak (locked area keys required)
~ R-4
~ R-9
~ R-lOB
~ R-13
~ R-14 b.
AUX BLDG sump pump run frequency
- NORMAL (Refer to leakage surveillance sheet) c.
AUX BLDG sump tank leak rate NORMAL (Refer to leakage surveillance sheet)
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AP-CVCS.1 CVCS LEAK REV' PAGE 7 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6
Check For Leak In Charging Line To REGEN Hx:
o Annunciator A-4, REGEN HX LETDOWN OUT HI TENP 395'F EXTINGUISHED o
REGEN Hx letdown outlet temperature
- LESS THAN 350'F AND STABLE (archive PPCS point ID T0127)
Perform the following:
a.'lose or verify closed loop B
cold leg to REGEN Hx, AOV-427.
- b. Close letdown orifice valves (AOV-200A, AOV-200B, and AOV-202).
- c. Control charging pump speed as necessary to maintain RCP labyrinth seal D/P less than 80 inches.
- d. Close charging flow control
- valve, HCV-142.
e.
Close charging to loop B cold
- leg, AOV-294.
f.
Go to Step 9.
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AP-CVCS.1 TlTLE:
CVCS LEAK REV:
6 PAGE 8 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION o
IF LEAK EXISTS IN THE LETDOWN LINE, H2 GASES FROM THE VCT MAY DIFFUSE OUT THE LEAK AND CAUSE A HAZARDOUS CONDITIONS o
" WHILE ON EXCESS LETDOWN, VCT LEVEL MAY BE DECREASED BY MANUALLYDIVERTING EXCESS LETDOWN FLOW TO THE RCDT USING AOV-312.
7 Check Normal Letdown:
a.
Normal letdown
- IN SERVICE b.
Check Letdown Indications:
o Letdown flow - APPROXIMATELY 40 GPM o
Low pressure LTDN pressure APPROXIMATELY 250 PSIG o
Pressure control valve, PCV-135, demand-APPROXIMATELY 35%
OPEN a.
Perform the following:
- 1) IF excess letdown in service, THEN perform the following:
a) Close excess letdown isolation valve, AOV-310.
b) Close excess letdown flow control valve, HCV-123.
2)
Go to Step 8.
- b. Isolate Normal Letdown:
- 1) Close loop B cold leg to REGEN Hx, AOV-427
- 2) Close letdown orifice valves (AOV-200A, AOV-200B, and AOV-202)
, 3) Control charging pump speed as necessary to maintain RCP labyrinth seal D/P less than 80 inches.
- 4) Close charging flow control
- valve, HCV-142
- 5) Close charging to loop B cold
- leg, AOV-294.
- 6) Establish excess letdown (Refer to Attachment EXCESS LETDOWN).
7)
Go to Step 12.
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AP-CVCSe1 TITLE:
CVCS LEAK REV:
6 PAGE 9 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 8
Check For Leakage To CCW System:
o CCW radiation monitor (R-17)
NORMAL IF leakage to the CCW system is indicated, THEN go to AP-CCW.1, LEAKAGE INTO THE COMPONENT COOLING LOOP.
o CCW surge tank level APPROXIMATELY 50%
AND STABLE CAUTION RCP OPERATION WITHOUT SEAL INJECTION SHOULD BE MINIMIZED.
9 Check RCP Seal Injection Indications:
o Seal injection flows GREATER THAN 6 GPM AND STABLE o
RCP labyrinth seal D/Ps GREATER THAN 15 INCHES AND APPROXIMATELY EQUAL o
RCP seal inlet temperatures STABLE IF RCP seal injection leak is suspected, THEN perform the following:
- a. Verify charging flow control
- valve, HCV-142, open.
IF no charging path through REGEN Hx available, THEN go to Step 15.
IF NOT, THEN seal injection should be maintained.
- c. Attempt to locate and isolate leak.
d.
Go to Step 12.
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AP-CVCS.1 TITLE:
CVCS LEAK REV:
6 PAGE 10 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 10 Check RCP Seal Leakoff Flows:
o RCP seal leakoff flows -
GREATER THAN 0.,25 GPM o
RCP seal leakoff flows - STABLE Dispatch AO with a key to the RWST gate to.check seal return line for leakage.
IF a seal return line leak is indicated downstream of RCP seal return isolation valve, MOV-313, THEN perform the following:
a.
Close RCP seal return isolation
- valve, MOV-313.
- b. Monitor RCP indications.
- c. Evaluate leak location.
IF
- possible, THEN isolate the seal
.return line from the VCT.
d.
Go to Step 12.
IF no seal return line leakage, indicated in the AUX BLDG, THEN investigate for leakage in CNMT.
11 Evaluate Local Leak Investigation CVCS SYSTEM INTACT IN AUX BLDG Determine if leak can be isolated (Refer to CVCS piping diagrams. as necessary).
12 Evaluate Plant Status:
a.
Leak location identified
- a. IF CVCS leak NOT indicated, THEN go to AP-RCS.1, REACTOR COOLANT LEAK.
b.
Check RCS conditions:
o Leakage within limits (Refer to leakage surveillance sheet and Tech Spec section 3.1.5) o At least one charging flowpath - AVAILABLEFOR INVENTORY,CONTROL
- b. Perform the following:
- 1) Ini.tiate plant shutdown (Refer to 0-2.1, NORMAL SHUTDOWN TO HOT SHUTDOWN).
2)
Go to Step 15.
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AP-CVCS.1 TITLE:
CVCS LEAK REV:
6 PAGE 11 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Check Normal Or Excess Letdown IN SERVICE IF normal letdown desired, THEN perform the following:
- a. Verify charging line flow to REGEN Hx -
GREATER THAN 20 GPM
- b. Place letdown controllers in MANUAL at 35% open.
~ TCV-130
~ PCV-135
- c. Verify letdown isolation valve, AOV-371, OPEN d.
Open B loop cold to REGEN Hx, AOV-427 e.
Open letdown orifice valves as necessary
- f. Place TCV-130 in auto at 105 'F
- g. Place PCV-135 in AUTO at 250 psig
- h. Adjust charging pump and HCV-142 as necessary to control PRZR level and RCP labyrinth seal D/P IF normal letdown NOT available, THEN establish excess letdown if desired (Refer to Attachment EXCESS LETDOWN).
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AP-CVCS.1 CVCS LEAK REV:
6 PAGE 12 of 12 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 14 Establish Stable Plant Conditions:
a.
PRZR level
- TRENDING TO PROGRAM
- a. Control charging flow as necessary to restore PRZR level to program.
b.
PRZR pressure
- b. Verify proper operation of PRZR heaters and spray or take manual control of PRZR pressure controller 431K.
IF pressure can NOT be controlled, THEN refer to AP-PRZR.1, ABNORMAL PRESSURIZER PRESSURE.
NOTE:
Refer to 0-9.3, NRC STATE AND COUNTIES IMMEDIATE NOTIFICATION, for reporting requirements.
15 Notify Higher Supervision
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AP-CVCS.1 CVCS LEAK REV:
6 PAGE 1 of 1 AP-CVCS.1 APPENDIX LIST TITLES PAGES 1)
Attachment EXCESS LETDOWN
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