ML20053B045
| ML20053B045 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 04/29/1982 |
| From: | DUKE POWER CO., WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20053B043 | List: |
| References | |
| NUDOCS 8205270686 | |
| Download: ML20053B045 (13) | |
Text
Enclosuro 2 y
DUKE POWER COMPANY MCGUIRE NUCLEAR STATION - UNIT 1 DUKE-NRC-li MEETING j
APRIL 29,1982
~
INTRODUCTION REVIEW OF MCGUIRE OPERATING HISTORY
SUMMARY
OF PROPOSED OPERATING PLAN b
JUSTIFICATION FOR PROPOSED OPERATING PLAN
- SIZE OF EXISTING DEFECTS (VOLUME / DEPTH)
- MAXIMUM ALLOWABLE DEFECT SIZE
- ACCELEROMETER RESULTS ASSESSMENT OF EFFECTS OF PROPOSED OPERATING PLAN 4
- WEAR CONSIDERATIONS
- SAFETY CONSIDERATIONS' I
OPERATING OBJECTIVES PRIOR TO MODIFICATION h
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6, OPERATING / LICENSING
SUMMARY
OCTOBER 30, 1981 DUKE INFORMED NRC 0F RINGHALS TUBE LEAK NOVEMBER 16, 1981 McGUIRE - SHUTDOWN FOR ECT N0 INDICATIONS 'A' S/G (MAX. POWER 50%)
NOVEMBER 20, 1981 DUKE - NRC - H MEETING DISCUSS PLANS FOR McGUIRE DECEMBER 2,1981 MNS - SHUTDOWN FOR ECT N0 INDICATIONS 'A' S/G (MAX. POWER 75%)
DECEMBER 29, 1981 DUKE DESCRIBED PLANS FOR OPERATION OF McGUIRE (OPERATION FOR SHORT PERIOD UP TO 100% POWER)
JANUARY 2, 1982 McGUIRE RETURNS TO POWER JANUARY 15, 1982 TELECON DUKE - NRC - M UPDATED NRC ON STATUS JANUARY 26, 1982 DUKE PROVIDED BASIS FOR OPERATION AT 50% TO 2/15/82 JANUARI 29, 1982 SUBMITTAL OF UPDATE ON OVERALL PROGRAM FEBRUARY 12, 1982 DUKE REQUESTED EXTENSI,0N TO 0.PERATE FEBRUARY 18, 1982 UNTIL 2/26/82
OPERATING / LICENSING
SUMMARY
FEBRUARY 22, 1982 NRC AUTHORIZATION TO OPERATE UNTIL 2/26/82 FEBRUARY 26, 1982 McGUIRE SHUTDOWN FOR ECT MARCH 4, 1982 MEETING AT McGUIRE TO REVIEW PLANS FOR INSTRUMENTATION AND ECT MARCH 6, 1982 ECT OF ALL 4 S/Gs 4 INDICATIONS IN 'C' S/G NOTED MARCH 12, 1982' VISIT TO WESTINGHOUSE FACILITIES' BY NRC - REVIEWED VARIOUS R&D PROJECTS MARCH 16, 1982 DUKE JUSTIFICAT. ION SUBMITTED FOR CONTINUED OPERATION AT 50%
AND 75%
MARCH 19, 1982 McGUIRE RETURNED TO 50% POWER APRIL 1, 1982~
NRC EVALUATION OF DUKE PROPOSAL -
1500 HOURS AT 50%
APRIL 29, 1982 MEETING TO DISCUSS EXTENDING OPERATION / 75% OPERATION
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.. PO.WER HISTORY (HO..URS - 4/29/82) th!T 25H 275%
290%
2 95%
i itGUIRE 1 2400 324 72 23 i
RINGHALS 3 3760 2180 1640 1375 i
I fi MRAz 1 3588 1551 1456 537 ItGulRE 1 - CURRENTLY OPERATING AT 50% POWER l
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r, HIGHLIGHT
SUMMARY
McGUIRE UNIT 1
- NRC COMMENTS ON MARCH 16, 1982, SUBMITTAL IDENTIFIED FOUR MAJOR CONCERNS:
- UNCERTAINTY IN THE ESTIMATE OF THE VOLUME OF LARGEST EXISTING DEFECT
- INSUFFICIENT JUSTIFICATI N FOR UPPER BOUND OF OF ALLOWABLE WEAR l
- RESULTS OF DATA ANALYSIS FROM NEW TUBE VIBRATION MEASURING INSTRUMENTS
- UNCERTAINTY IN TUBE WEAR RATES FOR POWER LEVELS ABOVE 50 PERCENT ADDITIONAL DATA TO SUPPORT PREVIOUS POSITION IS NOW AVAILABLE
- TWO MORE REMOVED TUBES HAVE BEEN EXAMINED
- DATA FROM TUBE VIBRATION MONITORING INSTRUMENTS HAS BEEN ANALYZED
- WEAR RATE ESTIMATES HAVE BEEN REEVALUATED
- ALMARAZ UNIT HAS RECEIVED A NEW STEAM GENERATOR INSPECTION t
l O
ESTIMATE OF f1AXIMUM EXISTING-DEFECT SIZE
- PREVIOUS INSPECTION OF MCGUIRE LOCATED FOUR TUBE WEAR DEFECTS
- LARGEST OF THESE DEFECTS IS MUCH TOO SMALL TO SIZE ACCURATELY
- SEVERAL METHODS USED TO ESTIMATE DEFECT VOLUME:
- COMPARISON,WITH EDDY CURRENT SIGNALS FROM LABORATORY PRODUCED DEFECTS
- COMPARISON WITH EDDY CURRENT SIGNALS FROM FIELD DEFECTS
- MEASUREMENT OF DEFECT GEOMETRY AND COMPARISONhITH-REMOVEDTUBES UPPER BOUND ON EXISTING LARGEST. DEFECT:
VOLUME = 4.0 x 10-4 CUBIC INCHES BESTESTIMATEOFDEFECTVOLUMEISLESSTHAN1'5x10-4 CUBIC INCHES
MAXIMUM ALLOWABLE DEFECT SIZE G0AL IS TO ESTABLISH ALLOWABLE ADDITIONAL WEAR BETWEEN STEAM GENERATOR INSPECTIONS
- PREDICTABLE RELATIONSHIP BETWEEN VOLUME AND DEPTH OF WEAR (SEE FIGURE 1)
- LARGE INCREASE IN VOLUME REQUIRED TO CREATE SIGNIFICANT DEPTH INCREASE
- VOLUMETRIC WEAR IS' PROPORTIONAL TO TIME
-RECENTEDDYCURRENTEXAMINATIONOFALMARAZINDIdATES AVERAGE STEAM GENERATOR WEAR MUCH LOWER THAN PREVI-OUSLY ESTIMATED MAXIMUM ALLOWABLE DEFECT DEPTH ESTABLISHED AS 10 MILS, OR 23 PER CENT THROUGH WALL.
-NOLONGTERMEFFNCTONSTEAMGENERATORINTEGRITY
- CONSERVATIVE UPPER BdVND - ACTUAL WEAR EXPECTED TO I
BE MUCH LOWER 0
1
.c.
l
- - - " - - - ~ -
r TUBE VIBRATION EASlJREENT PROGRAM
- DURING MARCH, 1982, ACCELEROMETERS INSTALLED IN TWO FRONT' ROW TUBES AT MCGUIRE (FIGURES 2 AND 3)
- TUBE VIBRATION MEASURED AT VARIOUS POWER LEVELS FROM ZERO To 75 PERCENT
- NO EV1DENCE OF FLUIDELASTIC INSTABILITY
- NO EVIDENCE OF LARGE AMPLITUDE DISPLACEMENT OR HIGH ACCELERATION
- TUBES APPEAR TO BE BUFFETED BY FLUID TURBULENT FORCES
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BENEFITS OF PROPOSED MCGUIRE PROGRAM
- MAXIMIZE OPERATING POWER LEVEL FOR UNMODIFIED STEAM GENERA' TORS WHILE PREVENTING SIGNIFICANT TUBE DAMAGE
- DETERMINE RELATIONSHIP BETWEEN OPERATING POWER LEVEL, TUBE VIBRATION, AND TUBE WEAR REDUCE COMPLEXITY OF REQUIRED MODIFICATION INCREASE CONFIDENCE IN ABILITY OF INSTALLED INSTRUMENTATION TO DETECT DAMAGING TUBE VIBRATION PROVIDE A BASIS FOR EVALUATING EFFECTIVEN5SS OF MODIFICATION USING INSTALLED TUBE VIBRATION INSTRUMENTA-TION BENEFITS OF INFORMATION TO BE GAINED OUTWEIGH RISK OF SMALL AMOUNT OF ADDITIONAL TUBE WEAR.
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r IMPACT OF OPERATING PLAN UPPER BOUND FOR ADDITIONAL WEAR IS 8.89 x 10-4 CUBIC INCHES UPPER BOUND FOR THROUGH WALL PENETRATION IS 10 MILS (23 PERCENT)
NO SAFETY CONCERN NO TUBE PLUGGING TO BE REQUIRED UPPER BOUND DEFECT MUCH SMALLER THAN DEFECTS LEFT IN SERVICE AT ALMARAZ AND RINGHALS 3 LONG TERM INTEGRITY OF ST,EAM GENERATOR TUBES NOT ADVERSELY AFFECTED i
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CONCLUSIONS UPPER BOUND FOR MAXIMUM DEFECT IN f1CGUIRE IS 4 x 10-4 CUBIC INCHES AFTER 324 OPERATING HOURS AT OR ABOVE 75 PERCENT POWER UPPER BOUND ON ADDITIONAL WEAR INCURRED DURING 30 DAYS AT 75 PERCENT RESULTS IN DEFECT DEPTH OF 10 MILS (23 PERCENT)
NO. EVIDENCE OF FLUIDELASTIC INSTABILITY OR LARGE AMPLITUDE VIBRATION AT 75 PERCENT POWER I
- TUBE WEAR RATES ARE ZERO,0R VERY SMALL AT POWER LEVELS UP TO AND INCLUDING 75 PERCENT THERE IS NO SAFETY CONCERN, NOR WILL THERE BE ANY LONG TERM ADVERSE EFFECTS, WITH OPERATION FOR 30 DAYS AT 75 PERCENT POWER O
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20 30 81 0 5O DE rg.T DFFTH ( W! t. 5 )
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FUTUREACTIONS
- IhY 15,1982 INCREASEPOWERTO75%
l JUNE 14, 1982 REDUCE POWER TO 50%
(720HRSAT75%)
s JUNE 18, 1982 SHUm0WN - ECT Au. S/G'S (NLT JULY 4, 1982)
RETURN TO P0hER
.: I'llD JULY (75%FOR.?.HOURSDEPENDING ON RESULTS'0F ECT, 50% uNTIL READY TO SHUTD0hN)
SHUll)OhN, ECT RETURN TO P0hER CONTINUE OPERATE, SHUTDOWN, ECT AS LONG AS NECESSARY
'UNTIL IODIFICATION INSTALLED.
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