ML20096F270

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Nonproprietary North Anna Unit 1 SG Startup Approval Meeting Presentation Matls
ML20096F270
Person / Time
Site: North Anna Dominion icon.png
Issue date: 04/30/1992
From: Wootten M
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19303E834 List:
References
SG-92-04-017, SG-92-4-17, WCAP-13256, WCAP-13256-R01, WCAP-13256-R1, NUDOCS 9205200319
Download: ML20096F270 (79)
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~.. .. ~. WESTNGHOUSECLASS3 a WCAP-13246 - SG.92 04 017 ) = . Revision 1. A .'.T ' ] L.1 North Anna Unit 1 - [ Steam Generator Startup Approval Meeting Presentation Materials. t 9 s April 1992 4 P 6 A Approved by: M.. Wootten Mhager. St rn Generator T hnology & Engineering. WESTNGHOUSE ELECTRICCORPOFMTION Nuclear Ser.' ices Division P.O. Bux 355 i - -- Pittsburgh, PA 15230-0355 L: C 1992 Westinghouse Electric Corporation l. ~ All Rights Reserved P y -,g e w ,wo, sn w-wrm, =*=--s

A meeting was held on' March 2,1992 between Virginia Power Company, Westinghouss and the NRR at One White Flint Buildin0. Rockville, MD, to discuss the status of the North Anna Unit 1 steam generators. The meeting agenda included discussions on:

1. Basis for Startup Approval (V;rginia Power) 2, Summary of SG Tube Eddy Current inspection Program and Results (Virginia Power)

. 3. Detailed Discussion of Inspection Results (Westinghouse)

4. Tube Integrity Evaluation (Westinc50use)
5. Operational Considerations (Virginia Power)
6. Startup Basis Summary and Sct.edule (Vi.pinia Power)

This document presents a compilaticw oUhe presentaten materials used by Westinghouse. Section 1 presents the materials used for the ' Detailed Discussion of Inspection Results". Section 2 oresents tne " lube integrity Evaluation" presentatior materials. Section 3 centains informaton wh:ch was not included directly in the presentations to the NRC or' March 2,1992, but which was provided to supplement the materials presented in Ssetions 1 and 2 of this report, as fo' lows: Pages 3-2 to 3-7 provice cuoplementary data for the evaluation of tubes with mixed mode degradation at the TSPs. Pages 3 2 and 3-3 show eddy current data from the 2-coil RPO for tube R8033-2H (SG C), which is one of 7 tubes shown on page 1 18 whn mixed mode indications at the same edge of the TSP. Pages 3 4 to 3-7 show EC data frc ra 2-coil and 3 coil RPC probos for tube R14C10-2H (SG C), which had axial and circumferentialindications at opposite edges of the TSP (see page 2-27); the figures indicate that the 3-coil RPC did not improve resolution of pstential mixed mode it'dications at the same elevation relative to the 2 coil RPC, Page 3-8 shows a plot of burst pressure vs. crack angle for single throughwall and segmented cracks. Page 3 9 shows burst pressure vs. crack angle for single cracks w'th 50% deep circumferential degradation beyond the throughwall region of the crack. These figures supplement the tube burst capability summary or' page 213. Pages 3-10 to 3-12 provide supplementary eddy current data on the tubes with the largest circumferential indications presented on page 2-14. Pages 313 to 315 provide supplementary eddy current data for the assassment of WEXTEX and TSP MCis on page 2 21. Pages 316 and 317 show oddy current data for tube R29C161H of SG C, supplementing the data for potential mixed mode cracking presented on . pages 2 24 to 2 26. Page 3-18 provides eddy current data for tube R25C8 of SG B, which had the Largest WEXTEX circumferentialindication in Zone 1 for the tube vibration assessment (page 2-31). Page 319 provides eddy current data for tube R45C50-1H of SG A, which had the largest TSP circumferential indication in Zone 1 for the tube vibration assessment (page 2 33). Page 3-20 supp!ements the summary of the EOC SLB leakage evaluation presented on page 2-36.~ i

l l Westinghouse Detailed Discussion of Inspection Results D. D. Malinowski 1 l. i t e " N 1-1

NORTH ANNA #1 FEBRUARY 1992 TU'BE PLUGGING

SUMMARY

A B C THROUGH 1991 463 425 650 WEXTEX (HL) (RPC) 15 10 11 TSP Oll) (RPC) 143 148 ' 178 OTHER (BOBBIN) 1 0 2 PREVENTIVE 7 2 10 total. 1992 166 160 201 CUMULATIVE 629 585 851 % PLUGGED 18.6% 17.3% 25.1% Ocot2001:022992 1 -2

's NORTH ANNA #1 FEBRUARY 1992 WEXTEX INSPECTION RESULTS STEAM GENERATOR i TUBES A B C SINGLE. AXIAL 3 0 2 MULTIPLE AXIAL. 0 0 0 SINGLE CIRCUMFERENTIAL 10 9 7 MULTIPLE CIRCUHFERENTIAL 2 1 2 'INERE WERE Q TUBES.WITH MIXED MODE DEGRADATION 4. IDENTIFIED IN THE WEXTEX TRANSITIONS. W N022792 1-3

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NORTH ANNA #1 FEBRUARY 1992 TSP AXIAL UACKS ELEVATION STEAM GENERATOR A B C SAI/MAI SAI/MAI SAI/MAI 1H 36/0 53/4 37/5 2H 24/2 14/3 41/1 3H 7/0 6/0 5/1 4H 5/0 5/0 8/0 5H 21/0 1/0 1/0 6H 3/0 1/0 2/0 s 7H 0/0 0/0 0/0 g, 9. sal SINGLE AXIALINDICATION MAI - MULTIPLE AXIALINDICATIONS m N is022792 1 -13

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NORTH ANNA #2 FEBRUARY 1992 WEXTEX CIRCUHFERENTIAL CRACK dROWTH 24 WIXTEX CIRCuMFERENTIAL CRACKS WER GROWTH FROM 1991 To 1992 USINn RPC oATA. AVERAGE CHANGE *: 12.80 12.20 '" $UPPO'Rt YEATY. CIRCUHFERENTIAL CRA 23 TSP CIRCUMFERENTIAL CRACKS COULD B GROWTH FROM 1991 TO 1992 USING RPC DATA. AVERAGE CHANGE *: 10.50 - 12.20 n.

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) NORTH ANNA #1 FEBRUARY 1992 TSPs WITH BOTH CIRCUMFERENTIAL AND AXIAL CRACKS i H0 CASES uF MIXED MODE DEGRADATION WER S/G A AHD S/G B. SEVEN (7) LOCATIONS WITH MIXED MODE DEGR SAHc TSP EDGE WERE OBSERVED IN S/G C. MINIHUM EL.EVATION I.UJBE_EDSI* CIRCJ)L. Sfd%RAIUiG_LI.GAMRILI TSP #1: R29016 + 750 > 250 R3C43 + 730 > 390 R18C46 + 690 > 690 TSP #2: R10C29 - 1190 >1130 R8C33 + 760 > 370 R29C64 - 910 > 270 + 630 > 170 R30067 + 1330 > 200 DATA WAS ACQUIRED WITH 2X RPC PROBE; FOR CLOSEST AXIAL-CIRCUHFERENTIAL PROXIMITY 3 COIL ZETEC PRO WAS USED; E HO APPARENT IMPROVEMENT IN RESOLUTION. ALL THESE INTERSECTIONS WERE JUDGED TO B AGAINST TUBE BURST CRITERIA. + UPPER EDGE - LOWER EDGE DDk2001:022992 1 18

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R I North Anna Unit 1 Steam Generatar Mid Cycle inspection Outage NRC Startup Approval Meeting March 2,1992 ~ Westinghouse Tube Integrity Evaluation T. A. Pitterle ~ This package contains Information proprietary to Westinghouse Electric Corporation. 21

TUBE INTEGRITY AS'SESSMENT DISCUSSION TOPICS GROWTH RATES: '92 RPC VS '91 8X1 " INSPECTION TRANJ{,t.H'?" 'A Mr.JERATIONS ACCEPTABLE INDICATIONS FOR BURST AND VTBRATION (WCAP-13034) TuBF INTEGRITY EVALUATION e LARGEST SCI AND SAI ASSESSMENT e MULTIPLE CIRCUMFERENTIAL INDICATION ASSESSMENT TUBE BURST TESTS ASSESSMENT s, o POTENTIAL COMBINED CIRC. & AXIAL ASSESSMENT e SUSCEPTABILITY TO TUBE VIBRATION e E00 SLB LEAK RATES tirro26 cz n92 22

GROWTH RATE COMPARISONS RPC: '92 '91* 8X1_: '91 '89 _ WEXTEX ISh WEXTEX 151s AVERAGE 260 210 300 310 90% cum. 570 470 600 540 PROBABILITY 95% cum. 660 630 730 670 PROBABILITY HEASURED GROWTH FOR SHORT CYCLE (254 vs 506 EFPD) MULTIPLIED BY FACTOR OF TWO FOR FULL CYCLE COMPARISON e 24 WEXTEX INDICATIONS IN '92 vs 112 IND. IN '91 e 23 TSP IND..IN '92 vs 77 IND. IN '91 4 23 19 2026 022692

WEXTEX Cumulative and Interval Crack Growth Distributions 100.00 % -m C e n-l 90.00% + f 60.00 % - W / 70.00% --

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f j 60.00 % I- / / ,d 'o 50.00 % p I /' [ 40.00% j-j I 4 30.00 % -- / g' t 20.00% -l l 10.00 % i 0.00 % i i' ; "; ", i '-- l l l i 0$$0$$$$$$30$ESEEEES - ---------~ Growth (Degress) O axi orowth M 1992 RPC -G-8 x1 Cumulative 1992 RPC (WCAP 13034) Growth % (WCAP 13034) Cumulattve % A Chart WEXTEX Growth Rs.tes 2/27/92

TSP Cumulative and Interval Crack Growth Olstributions 90.00 80.00% - E /~ 3 70.00% - ,/ 3 j 60.00% - j ~~ / o 50.00% - / / ! 40.00% -- / C / 30.00% E, 20.00% -- ~~~ 4 10.00% - 7 j 0.00 % l l 1 i t 0 ' ' 10 20 30 40 '50 60 70 80 90 Growth (DJgrees) O ext are.tn E 1992 RPC + 8x1 Cumulative -*-1992 RPC (WCAP 13034) Growth % (WCAP 13034) Cumulative % Chart TSP Growth Rates 2/27/92 2-5 L ___ _ __ _ _ ________ __ _ _ - _ ---_ _ _--

" INSPECTION TRANSIENT" CONSIDERATIONS i 1 PROJECTIONS (18 MO.) 0F WCAP-13034 i e WEXTEX PROJECTIONS PROJECTIONS BASED ON 8XI INSPECTION HIST 0RY SIGNIFICANTLY OVERESTIMATED' NUMBER AND-SIZE 4 0F INDICATIONS TYPICAL OF CYCLE FOLLOWING AN " INSPECTION TRANSIENT" (FIRST APPLICATION OF MORE SENSITIVE, RPC PROBE) l e TSP PROJECTIONS PROJECTIONS BASED ON 8X1 HISTORY UNDERESTIMATED NUMBER AND SIZE OF i INDICATIONS TYPICAL OF CYCLE HAVING AN " INSPECTION TRANSIENT" PEWER INDICATIONS WOULD BE ANTICIPATED NEXT CYCLE r L.. g' ~, - to2026:022992 2-6 ,. - -.. -. ~.. _ _ -.. ~. - _ _.. _. _ ~... _. _ -... _.. _. _.

-V WEXTEX 1992 EOC Projections vs. Actual 25 - 2 0 -- E ,o I f 15 - E l o I g 10 - E 5~ l I 'I 0 $E$$$$$$$$$$$$$$$ ~ ~ ~ ~ ~ n n n Crack Angle (Degrees) E Projections for 18 Months M 1992 Actual Attof 10 Months 2-7 Chart WEXTEX '92 Froj 18 Mo 2/25/92

l TSP 1992 EOC Projections vs. Actual 60 - 50 + EE 40 - t n i: 8 .a 0 30 - o E $ 20 - r 10 - l r 5d.aa. m 0-i >. i - u w w n u n n n Crack Angle (Degrees) M Projections for 18 Months E 1992 Actual After 10 Months I 2-8 Chart TSP '92 Proj 18 Mo 2/25/92 l I - ~

EXAMPLF. OF " INSPECTION TRANSIENTS" NORTH ANNA-1 PLANT A WEXTEX ISf WEXIEX CYCLE BEFORE RPC 28 110 0 .RPC " INSPECTION TRANSIENT" 216 212 56 CYCLE AFTER RPC-31 TBD 2 1 Yp20263022992

1 REG. GUIDE 1.121 CRITERIA FOR THRU-WALL CIRCUMFERENTIAL CRACKS TUBE BURST CAPABILITY OF THREE TIMES NORMAL OPERATING PRESSURE DIFFERENTIAL ADEQUATE MARGIN AGAINST RAPID CRACK PROPAGATION AND TUBE RUPTURE UNDER ACCIDENT CONDITIONS 9 CRACK PROPAGATION FR0H TUBE VIBRATION UNDER NORMAL OPERATING CONDITIONS INCLUDED IN THE EVALUATION LEAK RATE LIMIT THAT PROVIDES LEAK BEFORE BREAK ALLOWANCE IN ACCEPTABLE CRACK LENGTHS FOR EC UNCERTAINTY AND GROWTH (PLANT SPECIFIC) BETWEEN INSPECTIONS CONFIRH ACCEPTABLE LEAKAGE DURING LIMITING ACCIDENT CONDITION 9 STEAM LINE BREAK IS TYPICALLY LIMITING 2 10 ~

TUBE INTEGRITY ASSESSMENT APPROACH 2/92 INSPECTION RES!)LTS TYPICAL OF EXPECTED AT [ND OF HEXT CYCLE e CYCLE LENGTHS 254 EFPD PRIOR CYCLE 252 EFPD NEXT CYCLE PERFORM Tuse INTEGRITY ASSESSMENT FOR 2/92 INSPECTION RESULTS e CONSERVATIVE FOR NEXT EOC 100% RPC INSPECTION OF H.L. TSP INTERSECTIONS e TUBE BURST ASSESSMENTS SINGLE CRACKS HCIS POTENTIAL MIXED MODE e SUSCEPTIBILITY TO TUBE VIBRATION e SLB LEAK RATES 9 TAP 2026:022692

Crack Growth Models for ODSCC and PWSCC ODSCC j a.c ; BOC .i h 435'75' >50% l 1 f, l .a.- k_}) Detectability Threshold i i i; + 'Y, .h 50% Depth .t ../.. RMCC 1 c.c ' BOC i !23' 50' \\- Detectability Threshold:.

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CIRCUMFERENTIAL AND AXIAL CRACK TusE BunsT CAPABILITY

SUMMARY

CRACK MORPHOLOGY 34 P.O. APSLB N CIRCUMFERENTIAL CRACK ANGLES b,e SEGMENTED CRACKS $7,NGLE CRACK SINGLE CRACK WITH'50% . DEEP CRACK ~ ~ . AXIAL CRACK' LENGTHS - INCH D.C !y; SEGMENTED CRACKS-SINGLE CRACKS 1 L TAP 2026:022692 2 -13

i BURST CAPABILITY ASSESSMENT WEXTEX CIP.CUMFERENTIAL INDICATIONS j .e 1990 LARGEST WEXTEX CIRCUMFERENTIAL INDICATION -S / G B, R 2 5 C 3 6 e ALL INDICATIONS MEET 3AP BuRsr CAPABILITY - b,c FOR EXPECTED SEGMENTED CRACK -MORPHOLOGY - b,c. .i FOR THROUGHWALL CRACK TSP CIRCUMFERENTIAL INDICATIONS e-TWO INDICATIONS HAVE RPC CRACK ANGLES EXCEEDING b.c FOR 3AP FOR UNIFORM, THROUGHWALL CRACK ~ 2400'9:S/G A, R34C42, 2H e DEEPEST PART OF CRACK ~1340 e 2390 0 S/G A, R18C39, 1H DEEPEST PART OF CRACK ~ 960 o ALL INDICATIONS EXPECTED TO MEET 3AP suRST CAPABILITY 4 Yp2026:022692-2 14 . ~ +. -..

1 BURST CAPABILITY ASSESSMENT AXIAL INDICATIONS EXTENDING OUTSIDE TSP e MAXIMUM LENGTH OF 0.54" l.ESS THAN PRIOR OUTAGES 0F ~0.9" RPC LENGTHS SHORTER THAN BOBBIN LENGTHS USED PREVIOUSLY DUE TO REDUCED LEAD-IN AND LEAD-0UT EFFECTS FOR RPC COMPARED TO BOBBIN WESTINGHOUSE ROLL TRANSITION STUDIES INDICATE MEASURED RPC LENGTHS SHOULD BE REDUCED BY 0.1 INCH. EPRI NP-6368-L ALSO SHOWS GOOD AGREEMENT OF RPC LENGTHS WITH PULLED TUBE DATA. e CRACK LENGTH OF 0.72" MEETS 32iP BURST CAPABILITY FOR EXPECTED SEGMENTED CRACK MORPHOLOGY e AXIAL INDICATIONS AT TSPS MEET 3ZsP BURST CAPABILITY e 2 -15 fAP2026:022992 i

MCI BunST CAPABILITY ASSESSMENT MINIMUM LIGAMENT BETWEEN CIRCUMFERENTIAL INDICATIONS e RPC LIGAMENT CALL REQUIRES RETURN TO NULL POINT (BACKGROUND) BETWEEN CIRCUHFFRENTIAL CRACKS e TPC LIGAMENT REQUIRES 300-350 (0.2"-0.25") BETWEEN DEEP CIRCUMFERENTIAL CRACJ DUE TO RESOLUTION (COIL LEAD-IN AND LEAD-0UT EFFECTS) -LIMITATIONS CONFIRMED BY MEASUREMENTS OF EDM NOTCHES e MINIMUM LIGAMENT IN MCIS = RPC LIGAMENT ANGLE + 300 RPC MEASUREMENTS OF.THROUGHWALL CRACKS OVERESTIMATED BY ~300 80 REDUCTION IN ANGLE CAN BE CONSERVATIVELY APPLIED AT EACH END OF CRACK e i TAP 2c26:022692 2 16 w ,a-- e v- ..-.~m ,-4. -..y, -w,-,-- y-. w.-m-v -y-we .~r-,-se~. ,---,..,wr,w.re,-,w-c,------r--.w-v,-,-ge.,,-ym+w pr- = ee v- =e-www-.--v4 w.. y.,'-

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BURST TESTS FOR HULTIPLE CIRCUMFERENTIAL INDICATIONS BunsT TESTS 3 OBJECTIVE e CoNFIRH ACCEPTABLE LIGAMENTS FOR HCIS TO MEET STRUCTURAL INTEGRITY REQUIREMENTS RESULTS e MCI BURST CAPABILITY WITH HINIMUM ACCEFTABLE LIGAMENTS EXCEEDS BURST PRr.SSURE OF SCI HAVING SAME TOTAL CRACK ANGLE MINIMUH ACCEPTABLE LIGAMENT = 300-350 FULL THICKNESS MINIMUM ACCEPTABLE LIGAMENT = 600-700 P WITH 50% DEEP CRACK 4 TAP 2026:E22592

d Tube Burst Test Results for MCis Sinole Circumferentigj_jikLi ,g k Multiole Symmetric Circum!.erential Slots b,c. i J Multints Non Symmetric Circumferential Slots g -r S ) 9 ) e ne

i i 1 ( l BURST. PRESSURE VERSUS TOTAL CRACK ANGLE. 7/8X0.050 INCH TUBING VITH TSP RESTRAINT , b,c I .A t t 6 4 '. P 2 20

MCI BURST CAPABILITY ASSESSMENT WEXTEX HCIS e 5 Mr'S IDENTIFIED s SMALLEST RPC LIGAMENT = 120 (S/G A, R24C33) o MINIMUM LIGAMENT ~42U AND SUM OF CRACK ANGLES <2180 AFTER RPC RESOLUTION ADJUSTMENT e ALL HCI LIGAMENTS EXCEED 30-350 LIGAMENT SIZE REQUIRED FOR HCI BURST CAPABILITY TO t!XCEED THAT OF SINGLE CRACK WITH A 700 LIGAMENT e ALL WEXTEX HCIS MEET 3AP BURST CAPABILITY TSP HCIs e 15 HCIS IDENTIFIED e MINIMUM RPC LIGAMENT FOR ALL 15 HCIS ~410 MINIMUM LIGAMENT ~710 AFTER. RPC RESOLUTION ADJUSTMENT LIGAMENTS EXCEED 60-700 LIGAMENT SIZE REQUIRED FOR HCI 3AP auRST CAPABILITY e ALL TSP MCIS HEET 3AP BURST CAPADILITY 2 21 182026:022992

North Anna 1 WEXTEX HCis 191 11 .Th Locati 20 Uts_d Lhtd Circ,2 LisL2 h Steam Generator A 24 (54 )(I) 820 RlaC32 TS.12 1020 0 0 1520 1840 12 (42 )(I) 234 (218 ) 0 1140 850 0 0 0 0 R24C33 TS.08 149 iteam Generator 0 17 (47 )(I) 820 1805' 163 0 0 0 0 R9C36 TS+.00 81 itsam.itutelatl R10C72 TS.02 760 380 760 1700 1510 R25C50 T5.04 670 460 0 59 1780 1260 0 Note 1. RPC measured ligament increased by 30 for resolution limitations (coil lead-in and lead out effects). s TAP 2023:022992 I 2 22 I i

~- North Anna-1 ISP Hultiple Circumferential Indications (KCis) luht location Cire. 1 lia. 1 Cire. 2 tio. 2 Steam Generator A 0 R6C6 lH+.39 81 91 780 110 0 0 0 0 95 - 890 0 R17C10 lH+.50 90 86 0 0 0 87 - 67 0 75 R29C30 1H+.26 131 Steam Generator 8 0 0 0 680 117 61 RilC8 2H.21 114 0 0 106 2H+.23 108 650 81 0 0 0 0 0 98 59 R1208 3H+.23 128 75 0 0 54 0 0 101 R22C24 211. 3 0 132 73 41 (71 )(I) 0 0 66 (96 )(l) 115 0 0 0 0 R204) 3H+.29 138 0 0 80 0 88 101 0 311 25 91 0 0 0 0 107 101 R36C62 2H.23 83 69 $1 tam _ Generator C 0 0 87 R20C9 3H.27 130 64 79 0 0 0 0 R24C10 3H+.28 105 92 88 - 75 0 0 0 0 R10C29 2Ht.35 80 83 107 90 0 0 0 0 R18C44 2H+.35 99 90 109 - 62 0 0 0 0 0 96 82 103 0 R27C71 2H.30 79 Hote 1. RPC measured ligament angles based on return of signal amplitude to background For deep circumferential indications, the actual ligament exceeds or more (Figure 4-2, WCAP 13034) due to RPC null point. 0 the measured ligament by about 30 coil lead-in and lead-out resolution limits on crack angles. TAP 2023:022992

  • G 2

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EVALUATION FOR POTENTIAL MIXED-MODE CRACKING i i 14 OCCURRENCES IN S/G C OF CIRC. AND AXIAL IND. AT SAME TSP e 7 OCCURRENCES WITN AXIAL ON OPPOSITE EDGE OR INSIDE TSP COMPARED TO CIRCUMFERENTIAL CRACK l 1 NOT A CONCERN FOR MIXED MODE CONSIDERATIONS ) e 7 OCCURRENCES WITN AXIAL AT SAME EDGE A5 CIRCUMFERENTIAL EVALUATED FOR LIGAMENT RETWEEN AXIAL AND CIRC. HINIMUM RPC LIGAMENT-IS 200 FOR R30067, 2H e MINIMUM LIGAMENT OF 280 AFTER ADJUSTMENT FOR RPC RESOLUTION e MINIMUM LIGAMENT REQUIREMENT ., g l ~ e ALL LIG' 1 FOR POTENTIAL MIXED MODE CRACK EXCEED [ AND-WOULD MEET 3AP sURST CAPAsILITY J i. s TD2026:022H2 2 -24 l . ~.

L s NORTH-ANNA Oh'/10/92 INLET UNIT: 1_ SG: C REEL: 330 RES ) ~ sa:wg}sJ5 1 RR 0 is (' u M $ lz g l r 5 s E 1 4' a 3 i 4 a '44 - ? e ~~ A E ( g g :% Ef = o T t g i s m e a mO N W I g d u f H M 55 ~+L / g V t r 3 I R } y /. IIk3E 'd f ~ ~f y F-sua m 3 s i s ;. e ss i = e r

  • ' I

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3 j

i \\ i f A s 5 tk 4 n a 0 n 1 g i em B CV l A m "i 4 ~ i 2 -25 ? L

NORTH ANNA 03/10/92 INLET UNIT: 1_ SG: C REEL: 330 RES R i l !.I ,5}E E b l I u a m ~ I w g W m o u s -). ~ s N j %l.$_ 5 E I T I A .I ifi n i 4 g M 7 H l-a B E ? E ~ I e E 3 e n E W " i i = a ~ yu d o d a g a d$ a M eas C o t d ( 3 e n M d O E i us>s a T. g! T 7 8 p y y j 2x !E m, EL _5 x: s. :n! s k e 3 7 =*E-7 5 g' 3 4 I .,~ ;3 .+ 1 2* ~If h a

g.

p e x f ~l ( 1 o i ' I j ta b / A; \\ D 5 g ~ /,, e" 1' E j y 2, / s W 2, E $ 3 5 2 -( ( h m ,i I g I G E k e. --] 5 n, .1 Ef A - l' - s l hI i 2 26

North Anna-1 Mi.xed Mode Evaluation Derived (I) Measured (2) Tubg Locatiojl [.irc. Anale C.L. to C.L. Lic.Anale Wo.+ 0.5 Axial 0 Resolutions,, Steam Generator C 0 0 Ope;;ite Edges,No Concern R2009 3H.27 130 /79 0 Opposite Edges,No Concern l R14C10 2H+.20 101 0 Axial Inside ISP,No Concern RSCll 1H.27 96 R29C16 IH+.26 75 62 25 6 +28 Acceptable,large ligament 0 0 0 0 0 90 +23 Acceptable,large ligament R10C29 2H.29 119 0 Opposite Edges,No Concern l w R6C3; IH.30 85 0 0 U RSC33 2116.18 76 82 44 10 +27 Acceptable large ligament 0 0 Oppo<*te Edges,No Concern R6C40 3H.26 104 0 0 0 0 0 R3C43 IH+.31 73 75 39 17 '20 Acceptable,large ligament 0 0 0 36 +33 Acceptable,large ligament l R18C46 111+.33 69 R29C64 2H.33 91 75 30 10c,370 0 0 0 Acceptable,large ligament 0 Opposite Edges,No Concern 2Hv.47 63 20 (28 )3 5 +19 Acceptable.large ligament 0 0 133 (117 )3 86 0 0 0 R30C67 2H+.26 l R30C70 2H+.31 96 Opposite Edges,No Concern 0 l Notes:

1) Ligament angle obtained as circumferential crack centerline to axial crack centerline distance minus on-half the circumferential angle.
2) Ligament angle obtained as the measured ligament angle plus one-half the axial crack angle.
3) RPC measurements adjusted fer resolution (coil lead-in and lead-out) in measuring deep crack 0

angles. Resolution typically -1 coil diameter (0.105", 15 ) at each end of crack. 0 Conservatively applying 8 at each crack end. ~~~~~

ZONES FOR TUBE VIBRATION ASSESSMENT WEXTEX ZONES FOR INITIATION OF CRACK PROPA_GATION 8 ZONE 1: INITIATION AT TW ANGLES OF b,C 620 TUBES e ZONE 2: INITIATION AT IW ANGLES OF " b,c ~ 344 TUBES e ZONE 3: INITIAT,IOpATTWANGLESOF, 940 TUBES , b, o ZONE 4: INITIATION REQUIRES IW ANGLES 1484 TUBES 90% OF WEXTEX CIRCUMFERENTIAL INDICATIONS OCCUR IN ZONE 4. ZoN2S ALSO ENVELOPE CRACK PROPAGATION FOR CIRCUMFERENTIAL INDICATIONS AT _BOTT,03,0F 1ST TSP e TURBULENCE INITIATION AT, ,.IN ZONE 1 MININUM ANGLES FOR CRACK PROPAGATION IN EACH ZONE APPLY TO ONLY A FEW TURES IN THE ZONE. a 9 Yp 2026 mt2992 2 -28

w W ~ ec. q --M"-XXK .~ a'% ^ smX*- ~ M- ) s ~ A %ms8' ,A Aaaam. ir-- ~. Ev % I yA p d'--wm-X.. ~ yw ax= ---.s -,- - q c-r- 4 - - - a. _x -- ww o=n agh. .3-irir g - - - 5.. q N m.-**A g--- d ( am - - m X : m -- - - -y

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m, g "-' ' -- Q* p p % ai --m*- w ( 'e" - E M K. ) m 5. [ X X ? er C --x 4 a e y 2 -29 O

1 ACCEPTABLE RPC CRACK ANGLES FOR TUBE VIBRATION WEXTEX PWSCC TSP ODSCC(l) TW ONLY TW+ 50%(2) CONSERVATIVE TW CRACKS b,c 0 PERIPHERAL REGION ~ - IURBULENCE - FLUIDELASTIC O CENTRAL REGION - TURBULENCE - FLUIDELASTIC 2 EXPECTED CRACK MORPHOLOGY 0 PWSCC SEGMENTED CRACKS 5.0 - TURBULENCE - FLUIDELASTIC 0 ODSCC MODEL b,c - PERIPHERAL: TURBULENCE FLUIDELASTIC - CENTRAL: 3 TURBULENCE FLUIDELASTIC NOTES: 1. LIMITING CRACK ANGLES AT TSPS APPLICABLE TO BOTTOM OF 1ST TSP ONLY. HIGHER ELEVATIONS TO ,BOTT0JgoF TOP TSP REQUIRE TW CRACK ANGLES , EVALUATED FOR CRACK PROPAGATION DUE TO VIBRATION. 2. THROUGHWALL CRACK - 8,C J 3. MOST LIMITING PERIPHERAL TURE LOCATIONS 4. ODSCC MODEL ASSUMES ~ il,C a TAP 2026:022692 2 -30

TUBE VIBRATION ASSESSMENT WEXTEX CIRCUMFERENTIAL INDICATIONS CRACK PROPAGATION DUE TO VIBRATION DOES NOT OCCUR FOR .EXPRCfED SEGMENTED PWSCC CRACK MORPHOLOGY EVEN FOR J CRACK NETWORK ANGLES LARGEST CRACK ANGLES e ZONE 1: S/G B, R25C8 - 1570 (FIELD-1420) WELL DEFINED CRACK ANGLE ~1070 POSSzaLE TW ANGLE $$NIMUMZONE1OR ~ AT R25C8 NECESSARk FOR TURBULENT ~ ' CRACK PROPAGATION AT THIS LOCATION ONLY 1 WEXTEX CIRC. INDICATION IN ZONE 1 e ZONE 2: NO CIRCUMFERENTIAL INDICATIONS 9 Z0i;E 3: S/G A, R21C23 - 1180 TWO WEXTEX CIRC. INDICATIONSg[N THIS ZONE NAVERPCCRACKANGLES( MINIMUM IM ANGLE FOR CRACK PROPAGATION' s ZONE 4: S/G B, R25C36 - 1990 ALL WEXTEX CIRC. INDICATION _S IN THIS ZONE HAVE RPC CRACK ANGLES MINIMUM IM ANGLE F9R CRACK PROPAdATION' CONCLUS70N e H0 WEXTEX INDICATIONS SUBJECT TO CRACK PROPAGATION DUE TO TUBE VIBRATION. E TAP 2C26:022992

we------ - - ' _.h @f N C NN) .g g m i g 4 e c % %euM j 04 T-n x -k

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- M g +. M p* C i !4-O .e ad i v ~ i -g ,J 4 - x l e., m, 1 l~ m A. I w-t -o m Z 4; r- ^ * * ' CC. 4-v g CG-! O. 4! _m$ J W: x-f Y Oc' 9-- i. z es =+ a m M M Hf. -+!+tr;4thT ', f %w~ ~ $O w ~ w i LO

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TUBE VIBRATION ASSESSMENT TSP CIRCUMFERENTIAL INDICATIONS POTENTIAL FOR CRACK PROPAGATION EXISTS ONLY FOR TSP CIRC. INDICATIONS AT BOTTOM OF 1ST TSP e No CIRCUMFERENTIAL INDICATIONS FOUND ABOVE STN TSP e 31 CIRC. INDICATIONS OF BOTTOM OF 1ST TSP LARGEST CRACK ANGLES AT BOTTO(1 0F 1ST TSP e ZONE 1: S/G A, R45C50 - 1670 WELL DEFINED, DEEP CRACK ANGLES ~930 6c POSSIBLE, y ANGLE MINIMUM IN ZONE 1 OR, AT R45C50 NECESSARY FOR TURBULENT CRACK PROPAGATION REMAINING 6 CIRC. INDICATIONS <1040 RPC ANGLE e ZONE 2: S/G B, R15C9 - 1210 .. b.c ALL 3 INDICATIONS IN ZONE 2 ARE MINIMUM TW CRACK NECESSARY FOR PROPAGATION e ZONE 3: S/G C, R17C80 - 1730 . e,c. ALL 6 INDICATIONS IN ZONE 3 ARE MINIMUM TW CRACK HECESSARY FOR PROPAGhTION e ZONE 4: S/G A, R18C39 2390 _dc ALL 15 INDICATIONS IN ZONE 4 ARE MINIMUM TW CRACK ANALYZED FOR CRICK ~ PROPAGATION 'k iAP2026:C22992

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l' TUBE VIBRATION ASSESSMENT MCI AND MIXED MODE MCIS e WEXTEX ALL MCIS IN ZONE 4 NO TUBE VIBRATION CONCERN EVEN AT SUM OF CRACK ANGLES e TSPS No OCCURRENCES OF MCIS AT BOTTOM OF 1ST TSP MIXED MODE e' WEXTEX NO OCCURRENCES e TSPS NO OCCURRENCES OF CIRC. + AXIAL AT BOTTOM EDGE OF 1ST TSP TAP 2026:022992

E00 SLB LEAKAGE EVALLUION METHODS OF ANALYSIS PER WCAP-13034 _,,c EOC SLB LEAKAGE o 0.43 GPM: WEXTEX CIRcUMFERENTIAL e 20.4 GPM: TSP CIRCUMFERENTIAL e 3.40 GPM: TSP AXIAL e 24.2 GPM: TOTAL 1. e i 2 -36 t u zc26:02 m 2

NORTH-ANNA-1 TUBE INTEGRITY-ASSESSMENT OVERALL CONCLUSIONS OPERATIONL TO END OF NEXT PLANNED OPERAT.i:NG CYCLE -(252 EFPD) IS. ACCEPTABLE AND'HEETS R.G. 1.121 GUIDELINES TUBE BURST _ REQUIREMENTS (3AP) ARE MET AT E0C FORl SCIS, MCIS AND POTENTIAL MIXED MODE CONSIDERATIONS 1THE: POTENTIAL FOR PROPAGATION-0F<CIRCUMFERENTIAL CRACKS DUE TO-TUBE. VIBRATION IS NEGLIGIBLE . GROWTH-RATES OF CIRCUMFERENTIAL CRACKS ARE MODEST-e AVERAGE OF ~ 210 260 PER 16 MONTH CYCLE THE ESTIMATEo EOC SLB LEAK RATE IS ~24 GPM-e 100% RPC INSPECTION:AT TSPS LIKELY TO REDUCE TSP INDICATIONS-AND-: POTENTIAL LEAKAGE FOR NEXT CYCLE-2- 4 4 ~ 2 -37 f**zo26:022692

North Anna Unit 1 Steam Generator Mid-Cycle inspection Outage -NRC Startup Approval-Meeting March 2,1992 -1 Westinghouse i SupplementalInformation Package l-t I l ( This package contains information proprietary to Westinghouse Electric Corporation. 3-1

_. - - - 7,,....... s,._ NORTH ANNA _, 01/29/92 INLET UNI'1. 1 . SGt C L % 253 PRI ~ g s s e f'~ J i ~s.__g ~ 2 I 3 81_R 2 t T

  • l

/ k d uni a 4 .E.! } k sh iii n. ~ a*3 y g W 5 3e p 1

q

/ k i 1 t si \\ a ~ i " lc-Q 5 e ih d i ) e o a p Q f 5 j l l x

A4A- ~ sm s I 1-1,1

i. si 0"1 t

_=9 't d 'iE 4 ".q)1~t.s }*tf I w l 1 8 ; k+ -k a = E s e h _. dN g 4,7 ag. A i 4 *9 = g 4 s 5 {d $2::i l l. Qg. g.................. s y u w E g e r --e, W g.!! ~ 3@ z M. h &) ee of i t / ( 3 ,,/ 3 .? 5 s n... -j g y e , g W4 i l g f ( u A f m. -.m. 3 3-3

r G a 'r2 14:46 . ;s. NORTH ANNA 01/19/92 INLET UNIT: 1. f4 C RTE: 191 SEC gal _ l' ~ [ c= 5.- ( R R 5 g g uis s i g A g 4 5 Y A ating a 5k" l i.uun ill i i ell".I v y. ej g a g Il; S 3EE _3 2 5 3 fI i i '/' a l 3 n 5 g $ [ E ')c g....... g x R a 8 u W l-- \\ i b 3 L.i N I l G l5 1 8 .-I ~ ~ h b' i-R 3-4

M evs sv M >D O ~e 28 UIY U 3e Y 37.83 488 El-c CH 3 145 g M g [ ~ 3h f Stit s se _ Ik '. P N MW3 msg 34 g} Y Mieftssai ggg {fg-p 4 5*ET ..c x., uns, si useaan nusms runs num reist4es }' CIT M 39f .l g mis a lietccral [cieclaxiat sms; e.u ls.r e 3. L i Gerif fif01 kJ/CifC SGNSt71sf6 CorL 8 s a,ru wrceurex me aws wa-y j)wst Ar tormR eO6g tMs MAM*Irr,fKEO. rile Coar/Nueo PResen~x or 4J !"D"*n*'s ~~ L vit_ Ms me k ~ f

x1 pie CGAJrrA sfBER tar 77f AKI W5 g

inpicsre.s A deoner/r CMM*' AA'** W 3 y;ya A p/sseo of A Rtf*v' P ($1 1 W. g t e I I l ~ i .i ? W W T,or -3 3 m e-- 2n-e.t, y + u O = n' I ass e.ae ^

JUAltisits 02/19/92 INLET tJNIT: '( SGt C REEL: 383 PRI S L E M L DN (4 MT k zI Q s 1 l a k k u Y i z ; i %g Asw i a t 9 E 5 g dO4 4 i C B

  • M it %\\

j A W - % *c 8 } q }. {}ts9k*}k i 1 s:Enj i { I,[1fX u c [wil,h x4 R ti b

/ 1 is

= v ic ;l

=

g a a fin m

  • M1 ih
M-A W he

( "gll t sii=1 f f e %a, 4 by s i t e v ig a r g t s g s - ga y y d BE He 1 _ (E 55 f ( l\\ p q 1 4 j i i j e t k Av

l; b

i k.a -. _ - 2hYS 5 - -.w-wa... w.a a......-- O ,8 7m.. 5 2 ,,,,i,,,,l.. ,i,,,, ,,,,1..., .,,li...I., .k

  • 2.,

3 6 3[.g7 , h ;"r,U, I ':'- U

N@RTH ANNA 02/19/92 INLET UNIT: 1. SG: C REEL: 333 pg $g r { tE$ n c%4 s - = Is= i n 5 ~ 4 g W h $ ___ 9 <v I __ s 4S I g r a axfhj g g g,a,t,o_, g,< i, v Ei! 'E %$ E U _!! 5 .. g 3 j{o f ; o o 3:i! Q4%pj . //- y .I.s:- ae 5 5.

  1. 8 If,

/ r \\ \\ / j ~ I ,I i e I f U l i xw [d l]

j mu 2

l ._,, : _;=4_ _ _ _ ~m 5 ) M t ,,,,t.. ,,,,i,,;, 3-7 l 6

BURST PRESSURE VERSUS TOTAL CRACK ANGLE 7/8x0.050 lbCH TlRIt(3 VITH TSP RESTRAINT b,c Gu IS nu E M 4 5-a e ~ TOTAL CRACK RNGLE. OEGREES O k 3-8 1

7 BURST PRESSURE VERSUS TOTAL CRACK ANGl.E 7/8X0.050 INCH TUDING VITH TSP RESTRAINT + h E TOTAL CRACK RNGLE, DEGREES e 3-9

e u 3. cn 4 y ca 7 v s.43 399 KM CH 3 isa (il Hi E sc me nou mu cot - 'UUl l us or sten tsur5: 57 g g maanata niistan ts/se ersteol T5H l +9.99 l:] - (.IH 191 i TSM J -h D g N EXTEMT g ,,I m., ~ l CIRC lAXIALI SPEED t.29lIn/sec [RAiH g e q costs y lTRICGERj _4 I i l J L_ l l I f O I Ypp 4.24 WC 21 CCI g 5 i s W \\ o d I l r N k i b M M/, O J s' M_ - \\ P ~ ( f W_1 ~ 3 AXIN. VIEE f ~ h h CIRQR*JERENTIAL EXT 193 DEG ~ g N -1.15 3G .e. i / w AXIAL TEACE W AXIAL ENT: 2.21 IN Oc M I M t .e. i I .M, I ^.; wm j ~

NORTH ANNA ,,, 01/18/91 INLET UNIT: 1,SGt A REEL: 149 PRI g ! g l i e a P / n s = $f g A-t }j 'py a i n n l ] p] E a n i l 'g/ 'r (~' Al W , & /' )// 5 p 1 1 a ss s = $55,g$ q }. 3 I a el n e m 55-hs N N

    • x e

3 g............9-5 = m e* g g... q 2 E hT 5 s w Q ms E \\_ 5 h a \\y 3/ 4 ~ e ~ ( = .s . -,f 5 Mmoumumangsmenusulpuliur 5 i 3 -11 i

l NORTH ANNAL _ 01/18/92 INLET UNIT: 1_ so: A gggt 14\\ ppy IMIEW _..st l , ~ I $ k f' d h I ! l ;d bs 6 g e J a s s s s A W 3 9 mm B .c ? =e 1 U'" / a s !,, g g g i Ett.s -.3 i I "*I Cd j Y !c 8E H: M EE f' y l _ x Y i { u 0 E l f 5 5 = 3 4 g = s a.v n g ~ 1 b ! \\ 5 u 2 A 5 5 ~ x 3 12

NORTH ANNA 01/17/92 INLET UNITt 1_ SGt A REEL: 139 pgI 7 'I/[ I ggi -j$ ff[//j'. ( I g, o ( I. - = g=m: i f $ ( I E = gdu ! s 8 / w e s j: x i , ;( e 5 Y l s ~ InEhj k f ~ ( t 7 i / ,s,s.y ""*I j Y Em f 3 E { c 3E a 3: 11 x 5 Es )$ j ,f '"n y 3 -4\\ p / \\ i ( b E[ 5 = g e = J } g..................... z a 8 s s% /h 5 3 A w 1 = = 3 a s [ ^ x 6 h-- 1 m i 2-13

. :. e: as. 2.. l NORTH ANHA_ 01/31/92 INLET II;JIT: 1 SG: B RIEL: 229 RES ?$h n ~ N L. >l M t 2 /, ~ T' N 1 1 / / R b S i 5 W A g L Y >=?ag g b 1 m pI T,l 5 ~~ g g

C 2

s. E n i *. 3 "*I] 4 3 tg 7 l8 9E 3: E E5 l ~l 3 ~ 'W9 4 u k 5 1 ~g I @5 h n g g q g W g at / b 2 Q a 5 a ,n ( P* _... _..... 7.~. k ~ 5 l -_m_._-- n. I N ,ggg. _ _ l 5 l l -- ~ > * ,,.,i .I ,,i.,,, ,,,,i I l 3 -14 FEP 29 '92 13:01 "'M 2 M

) 4,3 i NORTH ANNA 01/31/92 INLET UNIT 1 SG3 6 RIEL: 229 RES ~i d _g.1 1, 8 N I R .=.=. R \\ ~ Q A 5Hc t! y M [. ( y \\ 18 4 .a.. I d i 1 ::! d g 8 f~- tR$2 C j ................... i...

i i

I W 5 us M :<: gg j c :: 5 - E E I"- dl m eli' i 5 5 = lc 3 ai l !E E E, t c a i f e' a h k $ _/ i ~- L ~ . = 5 n 2 g } g.................. 3 a 4 W j ( ) G N 4 i c ' u j 'tw;-- maa _..._._.__,.m ... ~.. ~ .. _... _.. ~ i.i.. fA. 3 I.. =g r. u . 5 I C ,,, i,,, l,,,,f l., l l l' FEB 29 '92 ;3:03 3 15 PAGE.003 l J

HORTH ANNA,,, ,_ ?!/23/92 INLET UNIT 1_ SGt C REEL: 219 RES 89 N-L 8g c "p" M;q 53 l I \\S l l 5 y$9 i ' \\\\ ( s l i l i \\\\ y 1 ljlt L 3 e a g e y , u\\ I g w jit ,j = = = s :: t 8 s 1 I V\\' it z i! .,8 i E , l %g h h

  • !!lgl a, i u

I J l as

a e
o b B h

t I 1 . tu e: A _.e 3 i a ( e' 5 5 3, y L_ ; g_.... 3 o p w g g g - m ,%A l 5 ? er u 5 a s 5 s. 1 s ,,,i..., ,,,,i,,,, ,,,,i,,,, ,,,,i.., 3 16 m

l NORTH ANNA 01/23/92 INLET UNIT: 1,SG C REEL: 219 RES -}L 5 5 I 3 -t 9 8 ) s l i g 9, l ~ _ . 4 .i 4CA f Cll)%iMMbll' ' ' 5 F a st kJ..a ns:j 2 u !

  • x..

b s!il'l A s 5 W h y

  • 8' t a !

2........~............. s 5 i 9: .i> l } li ) a l 1 y% u 8 J tl d* J \\ e E "_ 3 8 a V W i *v et d (l) 8 a SNA s v t u 3 (= e m MT 5 >\\ kL ~ w $ __ _m I -N jielt !1Mi I I I 1 l1 g t i t i e f 1 1 1 I i iiI i I if i f I f f I d 1 I I I.' 8 8 3 17 I i

NORTH ANNA 01/21/93 INLET UNIT! 1 SG B REEL: if5 PRI iW 9 c I y ,.* ?, [ ? j \\ i 7 5 5 d 2 l 5 g g g ( c 5 _Y 4,,.\\ s Y ZCI .E O n- .... f ( !!= a h y ers, = e.

g m B'

s, 4 9E 3 3: k m sg Ug = r. E o 9 4 i {' e m 3 a s m R 8 i g- .4_ l 6 Q w v a y ~ g a u [ f I 5 .......... mm ..m ...............m... 0 A d N y '5 j n 3-1B

NORTH ANNA ___ 02/04/92 INLET UNITt 1_ SG K REEL 263 RES W

n a y

r g ' 18 s 1 I l t 1 /h, I + s ; s ,b s 3 -<\\ i S

n=j i

1)' .........[............ ( 1 \\ 3 E E git I

n. ;

y pt m y- = 7 g,; BE a \\ a E na a c 5 0 ) $[4 n" A r 5 n M E g p

  • B--

I ~ R j i g -. v w k A 1 ( g s ] )+.A'. ' I 5 a f. :y. i' p .f 5 ,.%MLLu n i 7,.;i; _ ; i. !j h " " 2]I im.u use. uy . n u u, i ,a i n,ig.,., 77 .1, m., b M 3 -19 l T 1

l LEAK RATE VERSUS CIRCUMFERENTIAL CRACK ANGLE SEC+94TED CRFCKS IN 7/8X0.050' TUBING W E M 'J ~ TOTAL CRACK NETWORK ANGLE. OEGREES r 9 3 20 1 _- _ ___ _ __--__-_-_- - ____- -_-________-_____-___ - _ -_-_-__ _-_-___- _ _ _ ____ _ __ _ _-}}

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