ML17262A896

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Rev 6 to EOP AP-CVCS.1, CVCS Leak.
ML17262A896
Person / Time
Site: Ginna Constellation icon.png
Issue date: 05/06/1992
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17262A884 List:
References
AP-CVCS.1, NUDOCS 9206160408
Download: ML17262A896 (26)


Text

EOP: TITLE:

REV: 6 AP-CVCS.1 CVCS LEAK 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 PDR

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EOP:

REV 6 AP-CVCS.1 CVCS LEAK 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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EOP: T!TLE:

REV: 6 AP-CVCS.1 CVCS LEAK 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 IF PRZR level decreasing, THEN AT PROGRAM LEVEL 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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EOP: TITLE:

REV: 6 AP-CVCS.1 CVCS LEAK 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: a. Adjust controls as necessary.
1) RMW mode selector switch in AUTO
2) RMW control armed - RED LIGHT LIT
b. Check VCT level: b. Check letdown divert valve, LCV-112A, aligned to VCT.

o Level GREATER THAN 20%

Manually increase VCT makeup

-OR- flow as follows:

o Level - STABLE OR INCREASING 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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EOP: TITLE:

REV: 6 AP-CVCS.1 CVCS LEAK 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 b.'anually align valves as VCT necessary.

o LCV-112C open o LCV-112B closed 4 Check Xf RCS Leakage In CNMT: IF leakage is indicated in CNMT, THEN perform the following:

o Check CNMT radiation monitors NORMAL a. Direct HP to sample CNMT for entry.

~ R-2

~ R-7 b. Continue with Step 5 WHEN CNMT

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~ R-10A cleared for entry, THEN dispatch

~ R-ll personnel to investigate CNMT

~ R-12 for RCS leakage.

o CNMT sump A pump run frequency-NORMAL (Refer to leakage surveillance sheet)

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EOP: TITLE REV: 6 AP-CVCS.1 CVCS LEAK 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 BLDG:

If RCS Leakage In AUX Dispatch AO To AUX BLDG To Investigate For CVCS Leak (locked area keys required)

a. Check AUX BLDG radiation monitors - NORMAL

~ 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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EOP:

REV' AP-CVCS.1 CVCS LEAK PAGE 7 of 12 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Check For Leak In Charging Perform the following:

Line To REGEN Hx:

a.'lose or verify closed loop B o Annunciator A-4, REGEN HX cold leg to REGEN Hx, AOV-427.

LETDOWN OUT HI TENP 395'F EXTINGUISHED b. Close letdown orifice valves (AOV-200A, AOV-200B, and o REGEN Hx letdown outlet AOV-202).

temperature - LESS THAN 350'F AND STABLE (archive PPCS point c. Control charging pump speed as ID T0127) 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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EOP: TlTLE:

REV: 6 AP-CVCS.1 CVCS LEAK 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 MANUALLY DIVERTING EXCESS LETDOWN FLOW TO THE RCDT USING AOV-312.

7 Check Normal Letdown:

a. Normal letdown - IN SERVICE 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. Check Letdown Indications: b. Isolate Normal Letdown:

o Letdown flow - APPROXIMATELY 1) Close loop B cold leg to 40 GPM REGEN Hx, AOV-427 o Low pressure LTDN pressure 2) Close letdown orifice valves APPROXIMATELY 250 PSIG (AOV-200A, AOV-200B, and AOV-202) o Pressure control valve, PCV-135, demand- , 3) Control charging pump speed APPROXIMATELY 35% OPEN 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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EOP: TITLE:

REV: 6 AP-CVCSe1 CVCS LEAK PAGE 9 of 12 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 8 Check For Leakage To CCW IF leakage to the CCW system is System: indicated, THEN go to AP-CCW.1, LEAKAGE INTO THE COMPONENT COOLING o CCW radiation monitor (R-17) LOOP.

NORMAL o CCW surge tank level APPROXIMATELY 50% AND STABLE CAUTION RCP OPERATION WITHOUT SEAL INJECTION SHOULD BE MINIMIZED.

9 Check RCP Seal Injection IF RCP seal injection leak is Indications: suspected, THEN perform the following:

o Seal injection flows - GREATER THAN 6 GPM AND STABLE a. Verify charging flow control valve, HCV-142, open. IF no o RCP labyrinth seal D/Ps charging path through REGEN Hx GREATER THAN 15 INCHES AND available, THEN go to Step 15.

APPROXIMATELY EQUAL

b. Verify CCW cooling to operating o RCP seal inlet temperatures RCF thermal barriers. IF NOT, STABLE THEN seal injection should be maintained.
c. Attempt to locate and isolate leak.
d. Go to Step 12.

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EOP: TITLE:

REV: 6 AP-CVCS.1 CVCS LEAK PAGE 10 of 12 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 10 Check RCP Seal Leakoff Flows: Dispatch AO with a key to the RWST gate to .check seal return line for o RCP seal leakoff flows - GREATER leakage.

THAN 0.,25 GPM IF a seal return line leak is o RCP seal leakoff flows - STABLE 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 Determine if leak can be isolated Investigation CVCS SYSTEM (Refer to CVCS piping diagrams. as INTACT IN AUX BLDG 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: b. Perform the following:

o Leakage within limits (Refer 1) Ini.tiate plant shutdown to leakage surveillance sheet (Refer to 0-2.1, NORMAL and Tech Spec section 3.1.5) SHUTDOWN TO HOT SHUTDOWN).

o At least one charging 2) Go to Step 15.

flowpath - AVAILABLE FOR INVENTORY,CONTROL

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EOP: TITLE:

REV: 6 AP-CVCS.1 CVCS LEAK PAGE 11 of 12 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 13 Check Normal Or Excess IF normal letdown desired, THEN Letdown IN SERVICE 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).

EOP:

REV: 6 AP-CVCS.1 CVCS LEAK 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 - AT OR TRENDING b. Verify proper operation of PRZR TO 2235 PSIG 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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EOP:

REV: 6 AP-CVCS.1 CVCS LEAK PAGE 1 of 1 AP-CVCS.1 APPENDIX LIST TITLES PAGES

1) Attachment EXCESS LETDOWN

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