ML20052C627

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Forwards Proprietary & Nonproprietary Versions of McGuire 75% Power Level Steam Generator Tube Wear Estimates. Proprietary Version Withheld (Ref 10CFR2.790)
ML20052C627
Person / Time
Site: McGuire Duke Energy icon.png
Issue date: 04/30/1982
From: Parker W
DUKE POWER CO.
To: Adensam E, Harold Denton
Office of Nuclear Reactor Regulation
Shared Package
ML19268D331 List:
References
NUDOCS 8205050307
Download: ML20052C627 (25)
v • d • e


Text

{{#Wiki_filter:r ~. DUKE POWER COMPANY Powra Dust.oixo 422 Socin Cnuncu STazzT, CnAHWTTE, N. C. asa4a April 30, 1982 wlLLIAM O. PARKEM, JR. %Cr Patsiormt TELEPMoht:AmtA 704 Strau PseoowCTion 373-4083 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation 9 f'Q U. S. Nuclear Regulatory Commission 9 Washington, D. C. 20555 6 kUl c) ]\\ Attention: Ms. E. G. Adensam, Chief x ,y Licensing Branch No.'4 g. q 7 h* 12 Re: McGuire Nuclear Station Q w Docket Nos. 50 '469, 50-370 'O

Dear Mr. Denton:

The enclosed material is submitted as additional information to support Duke Power Company's request for operation of McGuire Unit 1 at power levels up to 75% for 30 days. The justification was submitted on April 28, 1982 and discussed with the NRC Staff in a meeting on April 29, 1982. As stated in this meeting, Westinghouse supports the proposed operaring plan. The following material is enclosed: (1) Five (5) copies of overhead slides used by Duke Power in the April 29, 1982 meeting (2) Five (5) copics "McGuire 75% Power Level Steam Generator Tube Wear Estimates", (Proprietary) (3) Five (5) copies "McGuire 75% Power Level Steam Generator Tube Wear Estimates", (Non-Proprietary) $0}l (4) Westinghouse letter approving use of proprietary information CAW-82-23, April 29, 1982 (Non-Proprietary) s / CY ) N? is proprietary to Westinghouse. It contains information proprietary to Westinghouse Electric Corporation and it is supported by an

  1. p affidavit signed by Westinghouse, the owners of the information. The affi M ;

uP davit sets forth the basis on which the information may be withheld from NS)$, Np public disclosure by the Commission and addresses with specificity the NT/I 3 considerations listed in paragraph (b) (4) of Section 2.790 of the Commis-sion's regulations. g lg Accordingly, it is respectfully requested that the information which is V*"O proprietary to Westinghouse be withheld from public disclosure in accordance to' C. U i"S T.Ra3*d k v/ic4mAV U205050307 820430 PDR ADOCK 05000 g, $g kg P

Harold R. Denton April 30, 1982 Page 2 with 10CFR Section 2.790 of the Commission's regulations. Correspondence with respect to the proprietary aspects of this application for withholding or the supporting Westinghouse affidavit should reference CAW-82-23 and should be addressed to R. A. Wiesemann, Manager, Regulatory and Legislative Affairs, Westinghouse Electric Corporation, P. O. Box 355, Pittsburgh, Penn-sylvania 15230. Very truly yours, $2% William O. Parker, Jr. / GAC/jfw cc: Mr. P. R. Bemis Mr. James P. O'Reilly, Regional Administrator Senior Resident Inspector U. S. Nuclear Regulatory Commission McGuire Nuclear Station Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 d a = ..-i

? ENCLOSURE 1 DUKE POWER C0f1PANY MCGUIRE NUCLEAR STATION - UNIT 1 DUKE-NRC-H MEETING APRIL 29, 1982 / INTRODUCTION REVIEW 0F MCGUIRE OPERATING HISTORY

SUMMARY

OF PROPOSED OPERATING PLAN JUSTIFICATION FOR PROPOSED OPERATING PLAN - SIZE OF EXISTING DEFECTS (VOLUME / DEPTH) l - MAXIMUM ALLOWABLE DEFECT SIZE - ACCELEROMETER RESULTS ASSESSMEllT OF EFFECTS OF PROPOSED OPERATING PLAN - WEAR CONSIDERATIONS - SAFETY CONSIDERATIONS OPERATING OBJECTIVES PRIOR TO MODIFICATION

o ? OPERATING / LICENSING

SUMMARY

OCTOBER 30, 1981 DUKE INFORMED NRC 0F RINGHALS TUBE LEAK NOVEMBER 16, 1981 McGUIRE - SHUTDOWN FOR ECT NO INDICATIONS 'A' S/G (MAX. POWER 50%) NOVEMBER 20, 1981 DUKE - NRC - W MEETING DISCUSS PLANS FOR McGUIRE DECEMBCR 2,1981 MNS - SHUTDOWN FOR ECT NO INDICATIONS 'A' S/G a (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 - H 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 EXTENSION TO OPERATE FEBRUARY 18, 1982 UNTIL 2/26/82

e; ? r OPERATING / LICENSING

SUMMARY

~ FEBRUARY 22, 1982 NRC AUTHORIZATION TO OPERATE UNTIL 2/26/82 i 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. a BY NRC - REVIEWED VARIOUS R&D t PROJECTS MARCH 16, 1982 DUKE JUSTIFICATION SUBMITTED FOR CONTINUED OPERATION AT 50% [ AND 75% MARCH 19, 1982 McGUIRE RETURNED TO 50% POWER APRIL 1, 1982 NRC EVALUATION OF DUKE PROPOSAL - i 1500 HOURS AT 50% APRIL 29, 1982 MEETING TO DISCUSS EXTENDING OPERATION / 75%.0PERATION I r --r,, .,r. w

POWERHISTORY(HOURS-4/29/82) P UNIT g g g 295% itGulRE 1 2400 324 72 23 e-(3180) (1044) k RINGHALS3 3760 2180 1640 1375 AU%RAz 1 3588 1551 1456 537 ItGUIRE 1 - CURRENTLY OPERATING AT 50% POWER O l -7 x

e ? - NRC COMMENTS ON MARCH 16, 1982, SUBMITTAL IDENTIFIED FOUR MAJOR CONCERNS: - UNCERTAINTY IN THE ESTIMATE OF THE VOLUME OF LARGEST EXISTING DEFECT - INSUFFICIENT JUSTIFICATIbN FOR UPPER BOUND OF OF ALLOWABLE WEAR - 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 e t ~

ESTIMATE OF MAXIMUM EXISTING DEFECT SIZE - PREVIOUS INSPECTION OF MCGUIRE LOCATED FOUR TUBE WEAR DEFECTS - LARGEST OF THESE DEFECTS IS MUCH T00 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 0F DEFECT GEOMETRY AND COMPARISON WITH REMOVED TUBES UPPER BOUND ON EXISTING LARGEST. DEFECT: VOLUME = 4.0 x 10-4 CUBIC INCHES BESTESTIMATEOFDEFECTVOLUMEISLESS-THAN1,5x10-4 CUBIC ~ INCHES e e 7.-....-.

MAXIMuti ALLOWABLE DEFECT SIZE GOAL 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 - RECENT EDDY CURRENT EXAMINATION OF ALMARAZ INDICATES AVERAGE STEAM GENERATOR WEAR MUCH LOWER THAN PREVI-OUSLY ESTIMATED MAXIMUM ALLOWABLE DEFECT DEPTH ESTABLISHED AS 10 MILS, OR 23 PER CENT THROUGH WALL. - NO LONG TERM EFFECT ON STEAM GENERATOR INTEGRITY - CONSERVATIVE UPPER BOUND - ACTUAL WEAR EXPECTED TO BE MUCH LOWER r ..f

f f i TUBE VIBRATION MEASUREMENT PROGRAM - DURING MARCH, 1982, ACCELEROMETERS INSTALLED IN TWO FRONT R0W TUBES AT MCGUIRE (FIGURES 2 AND 3) - TUBE VIBRATION MEASURED AT VARIOUS POWER LEVELS FROM ZERO TO 75 PERCENT - N0' EVIDENCE OF FLUIDELASTIC INSTABILITY l - NO EVIDENCE OF LARGE AMPLITUDE DISPLACEMENT OR HIGH ACCELERATION i i - TUBES APPEAR TO BE BUFFETED BY FLUID TURBULENT FORCES t i l I r

BENEFITS OF PROPOSED MCGUIRE PROGRAM - MAXIMIZE OPERATING POWER LEVEL FOR UNMODIFIED STEAM GENERATORS 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 FVALUATING EFFECTIVEN5SS OF MODIFICATION USING INSTALLED TUBE VIBRATION INSTRUMENTA-TION BENEFITS OF INFORMATION TO BE GAINED OUTWEIGH RISK OF SMALL AMOUNT OF ADDITIONAL TUBE WEAR. I i i l l .~

i 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 O. 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 O e i e .J

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  1. AUGS=115 FHC#=19 C

H 3 1.00E+1 i N S 1.00E+0 1.00E-1 \\ 1.00E-2 +> 1.00E-3 0.000 250.00 SPECTRUM: CH.3 (HZ) 1 I M u

-n,3,3-+ y :.4 .~,7,a=.31,;;9 .- ~ 14 ~ ' :._ - 0 (GPM) 1 2,600 FLUIDELASTIC >- INSTABILITY (0> 2400) 2,500 1 2,400 TRANSITION FROM [ BUFFETING TO ](] INSTABILITY 2,200 (2400 > OcR> 2200) 2,000 k{ TURBULENT I,800 >- BUFFETING (0<2200) I,600 1,400, i i 0 20 40 60 80 FREQUENCY, HZ Fig. 5. Tube response PSDs for various she11 side flowrates (ordinate not to scale)

e.g. 3 :.lQ?2 . - - - ~ ~ 4 1 39 ~ ' 16 4 0 G P M ].._ ~ ~ ~ ~ o,coi ~ ~ / / / O.0 01 TR A NSVERSE - rsi TO FLOW I '% NT o n 1,- 7' i3 l/- k 1 t s3 ~ .y?, 3 "( .s FLOW ,,j, pp 0.7 50 IN.DI A h TUB E U27 \\/ CASE 6 VU rI.c[ - 'j r -, s Ku:

t... '

M 0.040 H-y 0.020 ^ 0.040 t / 2, 0,020 / 11 i l El 'I \\ '[_[ '/ 1950 GPM INSTABILITY AND 1 ~ IMPACTING INITIATED Fig. 13. Tube vibration patterns

CONCLUSIONS - UPPER BOUND -FOR MAXIMUM DEFECT IN IlCGUIRE IS 4 x 10-4 CUBIC INCliES 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 OR 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 l 9

r-C ? [ FUTUREACTIONS N I'hY 15,1982 INCREASEPbWERTO75% JUNE 14,1982 REDUCE POWER TO 50% (720HRSAT75%) ~ JUNE 18, 1982 SuurD0m - ECT ALL S/G'S (NLTJULY4,1982) $MIDJULY RETURNTOPOWER (75%FOR2.HOURSDEPENDING ON RESULTS OF ECT, 50% UNTIL READY TO SHUTDOWN) SHUTDOWN,ECT RLr RN TO POWER CONTINUE OPERATE, SHUTDOWN, ECT AS LONG AS NECESSARY WTIL MDDIFICATION INSTALLED. .}}

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