ML20246D764

Steam Generator Update Tube Bundle Structural Integrity Presentation

ML20246D764
Person / Time
Site:	North Anna
Issue date:	07/31/1989
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19292J463	List: ML20246D748 ML20246D752 ML20246D764
References
WCAP-12350, NUDOCS 8908280259
Download: ML20246D764 (25)

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1,x' ' 4 .1 s '. if .c ,o..g<. s . e, e g 8 7,Y...t 4 ,.[' .m, ,. if "' e u. 4g _ j .c . n. Westinghouse Energy Systems ' ~ W )W ..e. ?- L _ ~ W, s 'g 5 6 Q4, j g kr ','u, .. C%1 .,,e WESTINGHOUSE CLASS 3 WCAP-12350 \\ NORTH ANNA UNIT 1 STEAM GENERATOR UPDATE TUBE BUNDLE STRUCTURAL INTEGRITY PRESENTATION JULY 1989 WORK PERFORMED UNDER SHOP ORDER NUMBER VECD-17106 I l WESTINGHOUSE ELECTRIC CORPORATION POWER SYSTEMS BUSINESS UNIT P. O. BOX 355 PITTSBURGH, PA 15230-0355 On Tuesday, July 18, 1989 a meeting was held between Virginia Power, J Westinghouse, and the NRR staff in One White Flint North Building, Rockville, Md to discuss the status of the North Anna Unit I steam generators. The overall presentation focussed on the tube support plate intersection and WEXTEX expansion transition zone primary water stress corrosion cracking occurring in the North Anna Unit I steam generator tubes. The meeting agenda included discussions on: 1. Plant Operating History 2. 1989 Refueling Outage Eddy Current Inspection Results 3. Tube Bundle Structural Integrity The Westinghouse presentation material on tube bundle structural integrity is provided herein. l A e .a =M 6 y t ir g e e t t a n 1 d I l p a tiU r n u Ur t o c at u n a r r t ne S An e e h l G d t r n om u Na B e t e S bu T NORTH ANNA-1 PULLED TUBE EVALUATION CONCLUSIONS TSP DEGRADATION e AXIAL CRACKS e PRINCIPAL DEGRADATION IS PWSCC WITH CRACKS EXTENDING OUTSIDE TSP o MINOR OD-SCC DEGRADATION WITH TSP e CRACK MORPHOLOGY SHOWS SEGMENTED CRACKS LIGAMENTS BETWEEN CRACKS CRACKS TEND TO BE C0 LINEAR WITH MULTIPLE INITIATION SITES AVERAGE CRACK LENGTH IS ~ 0.2" BETWEEN LIGAMENTS DEEPER WALL PENETRATION NEAR TSP IN "0LDER" CRACKS e CRACK ASPECT RATIOS IN RANGE OF 4/1 TO 6/1 NORTH ANNA-1 PULLED TUBE EVALUATION ~ CONCLUSIONS WEXTEX EXPANSION DEGRADATION e CIRCUMFERENTIAL CRACKS DUE TO PWSCC e CRACK HORPHOLOGY SHOWS SEGMENTED CRACKS AND PARTIAL THROUGH WALL CRACKS LIGAMENTS BETWEEN CRACKS CRACKS TEND TO BE COLINEAR WITH MULTIPLE INITIATION SITES AVERAGE CRACK LENGTH IS ~ 0.2" ( 280) e CRACK ASPECT RATIOS IN RANGE OF 4/1 TO 6/1 o a l l/ l iw SCHDiATIC OF SEGHEhTED CIRCLHTEREhTIAL CPJLCK 6 n c. n. . =.,.. _i c c,

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4. = a,b,e i o + g I i F I I 5s fj' cases utwatu sw l: Correlation between Axial Crack length ver. sus Leak Rate with Percent ' Tube Wall Thinning under Normal Operating Pressure Differential. .t l. __._.__.__.____..___.__________._.______s 4 C 4 CONSTANT SEGMENT LENGT11, SELECTED LIGAMENT SIZE TARIABLE NUMBER OF CRACE SE'GMENTS CONSTANT TOTAL CRACK LENGTH, MINIMUM ELASTIC LIGAMENT AREA VARIABLE NUMBER OF CRACK SEGMENTS CONSTANT SEGMENT LENGTE. MINIMUM ELASTIC LIGAMENT AREA VARIABLE NUMBER OF CRACK SEGMENTS i SEGMENTED CRACK MODELS ,7.. . l{' s, hs s a,b,C = LEAM IIATE F4 L-EL45fic LIGAMENTS CASE, MIN LEAMAGE L 3 k J.' En. '8 w E . oc w 4w J J ~ CftACM LENGTN, INCN _ :-- 2_ _ - NORTH ANNA UNIT 1 ^ COMPARISON AT PREDICTED AND ACTUAL LEAKAGE LENGTH OF INDICATIONS BEYOND SUPPORT PLATE EDGE CALCULATED LEAKAGE 3 LIG. 0.2" LONG RQW COLUMN LOCATION INDICATION LENGTH 4 CRACKS CRACKS 8.6.c l STEAM GENERATOR "B" - JANUARY, 1984 - a b.c 13 34 1-HL 0.59 13 34 1-HL 0.77 13 35 1-HL 0.59 13 35 1-HL 0.77 13 40 1-HL 0.49 13 40 1-HL 0.87 u STEAM GENERATOR "C" - JANUARY, 1984 ,,,3,c ..,3,c 3 10 1-HL 0.69 3 10 1-HL 0.57 3 10 2-HL 1.09 3 10 2-HL 0.97 3 39 4-HL 0.19 3 39 4-HL 0.57 3 39 5-HL 0.19 3 39 5-HL 0.57 ACTUAL = 400 GPD (1/84) } STEAM GENERATOR "A" - AUGUST, 1985 a,b,c -4,3,c 5 40 1-HL 0.54 5 40 1-HL 0.77 3 84 5-HL 0.08 4 69 1-HL 0.78 4 69 1-HL 0.69 ACTUAL LEAKAGE = 213 GPD (8/85) 3 ~ a A \\ m w~ ~%

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~ 41-1 g. @a~~aa = = = = a ~ R 2 O P BURST US L-ELASTIC LICAMENTS CASE, MIN LEAMAGE 8,b.C 2" C C w$ wW w M Q. E ce t t ~ CRACM LENCTH, I NCDI a 't d%J 1 h m m C -a O N 4 U3 M c A ~ O He -j v C Z l J" ga w ~ R 2 E S h y DV//A v v iE kx\\%%)N 5 Q E~ ws/ww//mn 6y ? g K x%%%%%N y WM/M/MMMMM//zM/A v g C mggggxggy e p U3 ers/z/MMzzM/MzzMn WQ 4 Rm wx g Z g 2 iwzz/z/zzMA v 1 x CD E + 1 syn 6 4 9 H l I 1 I i 1% N 8 8 8 9 R CO o CD g 9 SNO1Y30f4.30 M38WnN 9 s s+ som NORTH ANNA-1 TSP DEGRADATION ASSESSMENT CONCLUSIONS l PRIOR LEAKAGE HISTORY HAS DEMONSTRATED ABILITY TO CONTROL SHUTDOWN o EARLY ('84, '85) LEAKS OF 300-400 GPD o LEAK RATE YERSUS TIME DATA SUPPORTS SEQUENTIAL OPENING OF LIGAMENTS PULLED TUBE DATA SUPPORTS TUBE INTEGRITY WITH SEGMENTED CRACKS o INCREASED BURST PRESSURE FOR SEGHENTED CRACKS o DECREASED CRACK DEPTH AWAY FROM TSP INDICATORS SEQUENTIAL OPENING OF CRACKS CONSISTENT WITH LEAK RATE HISTORY PROJECTED AVERAGE CRACK LENGTHS ARE CONSISTENT WITH REG. GUIDE 1.121 8,C,e ,,8,C,e o DETECTABLE CRACK LENGTH OF WITH UNCERTAINTY AND AVERAGE CRACK GliOWTH ~ 0.10' FOR EXISTING CRACKS o PROJECTED CRACK LENGTH OF ~ 0.43" PROVIDES FACTOR OF 3 MARGIN ON OPERATING PRESSURE ~ NORTH ANNA-1 TSP DEGRADATION ASSESSMENT CONCLUSIONS PROJECTED CRACK LENGTHS ARE LESS THAN SEGMENTED MODEL, CRITICAL CRACK LENGTH FOR SLB . a.c.e CRITICAL CRACK LENGTH FOR SLB = e e PRIOR MAX. CRACK LENGTH: '87 INSPECTION = 0.9" '89 INSPECTION = 0.82" e PROJECTED FOR NEXT CYCLE < 0.82" NEGLIGIBLE LEAKAGE FOUND FOR TSP INDICATIONS IN LAST 2 CYCLES e CONSISTENT WITH EXPECTATIONS FROM SEGMENTED l CRACK MODELS i e LEAKAGE LIMIT OF APPR0XIMATELY 100 GPD EXPECTED TO PROVIDE SHUTDOWN PRIOR TO REACHING SLB CRITICAL CRACK LENGTH FOR SEGMENTED CRACK H0 DEL AND MAXIMUM POTENTIAL CRACK SIZE I 1 l l 4 l 1 r a .o 9 1 l \\ 1 l l w l .J E< x e u w -ru J >-o al b 1 W s a = = W o 1 l I I l 5 s i ISd *380SS3Wd ASWOG ~~*~e~,~. 1 i' ilj iiI; 1 1 c, b, a ELGNA S K E C E A R R G C ED LA T E O L T GN S A US K R C E A V RC ER L U A S T S O E T RP TSRUB ~ h u >meam wma IE3emsen. oIlIll

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N T I9 = b'1 9 !i I r -0 ) L X. b 98 M1 71 t A 0 w 0 E T K I 69 D 15 ( 1 T S S 0 N 94 E E M 31 D 1 V R D L E X 29 OV 1 1 1 N F E 0 F 0 M 91 O 9 T E E A L 0 G 8 N 9 A C 7 R S 06 X I 9 5 C 0 0 4 I F T O A 2, 0 8 6 4 2 O 1 C E I L D G N X I A n hm o o 69i i t ,lli1lil )1l ~ nt T ac e E h nl v ti aa S t nh N N A rso C eiis tdt e E O a il o T e ed g w S rtdnt gaaa M I R r s sarou B O npowl T W oeFt p L E I is S t er ao.se V S cwseh it eht d lte L N nd g g. ien,os t amt e O A xi s i 9 ibnidt P h 1 siot en V R 2 hiadi A fxt vda 3 oearat S 0 N T ce r e i sne 0 v0dnec 92 i8noen - k 9 I F1i cbu 1 9 3 L N D 8 19 e A O e 7 i C 1 E I I 0 D T S ( 6 91 N N 5 T s N 1 E E A 0 4 D R P 19 V 3 L b O 1 E X 3 0 V 2 N F E 91 T - A 1 F M O 1 3 -0 E U A 0 LG 1 9 N 9 C A R S 08 N . J I K C O 06 I F T O A1 2 0 g 6 4 2 1 C E I L D G N N I A ndUb&E8 o b 6ED (t ,jll,!l1l NORTH ANNA 1 WEXTEX EXPANSION DEGRADATION CONCLUSIONS STRENGTH CONSIDERATIONS SIMILAR TO TSP CRACKING - LIGAMENTS INCREASE STRENGTH AND DECREASE LEAK RATE RELATIVE TO A l SINGLE THROUGH WALL CRACK l l ,a,b c ' SINGLE CRACK WILL WITHSTAND STEAM LINE BREAK ~ h a,b,c SINGLE CRACK WILL WITHSTAND 3 A P u PRESSURE REQUIREMENT ~ ~ 8,b,C ) SEGMENTED CRACK WILL MEET 3 A P PRESSURE ~ REQUIREMENT FOR MINIMUM ELASTIC LIGAMENT SEGMENTED CRACK MODEL e LIGAMENT AREA CONSISTENT WITH PULLED TUBE o MAXIMUM PROJECTED CRACK FOR NEXT CYCLE < 2050 CONSERVATIVE SO GPD ADMINISTRATIVE LEAK RATE LIMIT ESTABLISHED e TEMPORARY PENDING OBTAINING ADDITIONAL TUBE MORPHOLOGY DATA TO ESTABLISH LIGAMENT CHARACTERISTICS FOR LONG CRACKS (> 1900), o SUPPORT MAINTENANCE OF 34 P MARGINS DURING OPERATION _