ML20081L495
| ML20081L495 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/28/1991 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19302E728 | List: |
| References | |
| WCAP-12899, NUDOCS 9107050121 | |
| Download: ML20081L495 (145) | |
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- WEC PROPRIETARY 1 CLASS 3 -
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WESTINGHOUSE PROPRIETARY CLASS 3 WCAP-12899 NORTH ANNA UNIT 1 STEAM GENERATOR C-3 STARTUP
- APPROVAL MEETING PRESENTATION MATERIALS FEBRUARY 1991 WESTINGHOUSE ELECTRIC CORPORATION Energy Systems P.O. Box 355 Pittsburgh, Pennsylvania 15230 (C) 1990 Westinghouse Electric Corporation, all rights reserved, i
A meeting was held on February 26, 1991 between Virginia Electric and Power Company, Westinghouse, and the NRR at the One White Flint North Building, Rockville, Md., to discuss the status of the North Anna Unit I steam generators. This document represents a compilation of the presentation materials used by Westinghouse. The following topics were presented:
- 1. Eddy Current inspection Results
- 2. R.G.1.121 Evaluation
- 3. Steam Generator Tube Integrity Assessment An additional data package, which was left with the staff for review on February 26, 1991, is included as Appendix A to this document. This data package contains eddy current inspection results for Steam Generators A, B and C. In the interest of time, only results from Steam Generator A were presented to the NRR staff during the meeting.
i e i l l .-. . . .
,a#A$an Ads- M4 J A M - )a A& 4. w J 4 umn enm-4.4w 6 AuA- 5w ,,-aAe-m am h & A An emm--e--nu anmur.-.,e-4a a aamm se a,:m m , me au-s,e-_w->
M4 K .swp-- 4-,, - .e - -- . I NORTH ANNA UNIT 1 STEAM GENERATOR INSPECTION RESULTS FEBRUARY 1991 i t 1 _ .- , . .--.. --- - - -- - ---- - ~ ' ' - -
- 4 4
NORTH ANNA 1 FEBRUARY 1991 TUBE PLUGGING ATTRIsuTIONS STEAM GENERATOR ATTRIsuTION A B C CIRCUHFERENTIAL INDICATIONS 29 16 47 AT SUPPORT PLATE , t WEXTEX TRANSITION 52 56 107 AXIAL OR CIRCUMFERENTIAL AXIAL INDICATIONS 73 79 92 AT SUPPORT PLATES SLUDGE ZONE ABOVE 30 5 14 EXPANSION TRANSITION OTHER 6 0 0 TOTAL 156 260 190
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9 NORTH ANNA UNIT 1 i STEAM GENERATOR TUBE LEAKERS l FEBRUARY 1991 l 1 i TUBE LEAKAGE OF THE ORDER OF 15 GPD WAS OB DURING THE LAST 5 MONTHS OPERATION PRIOR TO REFUZLTlG. LEAK ". HECKS PERFORMED DURING THE ,lSI CONFIRMED LEAV'.GE FROM 8 TUBES AS FOLLOWS: s/G A NDE RESULTS R17C9-1H LARGE BOBBIN SIGNAL, 8 X 1, SINGLE CRACK R24C52-TSH 135 DEG. CIRC CRACK (14 V) R8053-5H LARGE BOBBIN SIGNAL, TWO i AXIAL CRACKS R11066-TSH 189 DEG. CIRC CRACK (14 V)- R11071-TSH 125 DEG. CIRC CRACK (8 V) S/G B R37C75-1H LARGE BOBBIN SIGNAL, 8 X 1, MULTIPLE AXIAL CRACK R2C86-1H LARGE BOBBIN SIGNAL,_ MULTIPLE AXIAL CRACK-i S/G C R26C60-TSH 204 DEG. CIRC. CRACK (8 y) l
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4 NORTH ANNA UNIT 1 FEBRUARY 1991 DETECTION OF CIRCUMFERENTIAL TSP INDICATIONS THE FINDING OF VOLUMETRIC-ORIENTED EC INDICATIONS IN-THE DENTED TUBE SUPPORT-REGIONS ON THE HOT LEG WAS A NEW OBSERVATION IN 1989. 8 x 1 INSPECTION OF ALL 3 STEAM GENERATORS W PERFORMED TO ASSIST THE B0BBIN PROBE IN' '
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IDENTIFYING AFFECTED TUBES. ALL POSSIBLE INDICATIONS FOUND BY 8 X 1 AND ALL DISTORTED OR > 40% BOBBIN INDICATIONS J W' RE VERIFIED BY RPC TESTING - 538 INDICATIONS. - 105 INDICATIONS WERE ASSESSED AS EXHIBITING CIRCUMFERENTIAL BEHAVIOR; ALL WERE IDENTIFIED BY THE 8 X 1 PROBE, AND NONE WAS FOUND AMONG THE OTHER 433 INTERSECTIONS EVALUATED AT TUBE SUPPORT LEVELS USING THE RPC PROBE. 60 C0I: ID - LOOKING CRACK-LIKE SIGNALS 45(%): 00- - LOOKING VOLUMETRIC SIGNALS THESE WERE TREATED AS PLUGGABLE INDICATIONS'AND EVALUATED WITH RESPECT TO NEED FOR STABILIZATION.
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DATA ACCORDING TO THE RELATIONSHIP. N x 450 ~ ARC LENGTH WHERE N = NUMBER OF COILS SENSING INDICATIONS SINCE RPC DATA IS NOT AVAILABLE FOR 1989, 8.x 1 DATA At4ALYSIS WAS FORCE-FIT TO SIGNALS PREVIOUSLY REGARDED As NDD TO PERMIT ASSESSMENT OF GROWTH RATES FOR.THE CIRCUMFERENTIAL CRACKS. NEGATIVE CHANGES WERE-DISREGARDED, j I.E., SET TO 0, FOR CONSERVATISM. , l I
NORTH ANNA #1 , . FEBRUARY 1991 8 x 1 GROWTH ESTIMATES FOR SUPPORT PLATE CIRCUMFERENTIAL INDICATIONS CHANGE IN NUMBER STEAM GENERATOR OF COILS HITS A B C HUMBER OF INSTANCES 'l 0 G" 7 12 ' 1 10 5 27 2 12 5 12 3 3 2 4 4 0 0 2 5 0 0 0 6 0 0 1 7 0 0 0 8 0 0 0 WEIGHTED AVERAGE 1.3 1.1 1.6 . CHANGE EQUIVALENT CHANGE 590 500 720 ! IN Anc LENGTH l l
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1 I i NORTH ANNA UNIT 1 ! STEAM GENERATOR EXPERIENCE
SUMMARY
TUBE REMOVAL FINDINGS NOVEMBER 1985 TWO TUBES REMOVED TO CHARACTERIZE DENTED TSP SECTIONS WITH DEGRADATION. FINDINGS ESTABLISHED AXIAL SCC MAINLY OF ID ORIGIN, SPANNING TSP AND SLIGHTLY BEYOND, ARRAYED , IN LINEAR NETWORKS OF SHORT CRACKS SEPARATED BY LIGAMENTS. MAY 1987 TWO TUBES WITH APPARENT CIRCUHFERENTIAL , DEGRADATION AT EXPANSION TRANSITIONS EXHIBIT ID INITIATED SCC CIRCUMFERENTIALLY ARRAYED AS SHORT CRACKS SEPARATED BY LIGAMENTS. SLIGHT OD INTERGRANULAR CORROSION ABOVE THE EXPANSION REGION. JULY 1987 ONE TURE WHICH EXPERIENCED DOUBLE ENDED: BRE
. TOP TSP G7) EXHIBITED FATIGUE INDUCED CIRCUMFERENTIAL CRACKING WITH OUTSIDE i
DIAMETER INITIATION AT DENTED INTERSECTION. l l l
I!
?
NORTH ANNA UNIT 1 FEBRUARY 1991 TUBE REMOVAL SELECTION R11C14 FROM.S/G B WAS REMOVED - THE HOT LEG PORTION CUT JUST BELOW THE SECOND SUPPORT PLATE (2H). THIS TUBE EXHIBITED BOTH AN AXIAL INDICATION IN THE 1H SUPPORT PLATE AND A CIRCUMFERENTIALLY-ORIENTED INDICATION AT THE SUPPORT PLATE EDGE, i SEPARATED BY A 52 DEG. LIGAMENT. I r 4
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r , WESTINGHOUSE J. L. HOUTMAN REG. GUIDE 1.121 EVALUATION l
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........i..
. _ _ - - . _ _ . . _ _ _ _ _ . . . _ _ _ _ _ . - .... _ . _ . . _ _ _ . ~ - . - . . - . . , _ . _ - _ _ . - ~ - _ - _ _ . - . _ S NORTH ANNA UNIT 1 REG. GUIDE 1.121 EVALUATION i 9 1 REG. GUIDE 1.121 CRITERIA . 9 TUBE STABILIZATION CRITERIA FOR TUBES WITH CIRCUMFERENTIAL CRACKS 9 TUBE INTEGRITY CONSIDERATIONS . '- - - s
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,, -- ., , . , , . , . . , - . , , , . _ . . - . . - - . - , -. .- n...,
ll 1 REG. GUIDE 1.121 CRITERIA B ASSUNING THAT ALL TUBES WITH SIGNIFICANT INDICATIONS ARE REMOVED FROM SERVICE, ALL IN-SERVICE TUBES WOULD THEREFORE SATISFY R.G. 1.121 CRITERIA AT RESTART B A HISTORY OF RECURRING DETECTABLE INDICATIO AT EACH OUTAGE WARRANTS DEMONSTRATION OF 1 SATISFYING R.G. 1.121 CRITERIA AT THE END 0F THE NEXT OPERATING PERIOD B THE SPECIFIC CRITERIA FOR THRU-WALL CRACKS OF. PARAGRAPH C.3.d 0F THE REG, GUIDE ARE ' JUDGED TO APPLY. SUMMARIZING THESE ARE: 1) MAXIMUM PERMISSIBLE LENGTH 0F THE ' LARGEST SINGLE CRACK SHOULD BE SUCN . THAT A BURST CAPABILITY OF 3 TIMES NORMAL OPERATION DIFFERENTIAL PRESSURE IS MAINTAINED ' ! 2) ADEQUATE MARGIN SHOULD BE PROVIDED BETWEEN LOADINGS DUE TO COMBINED POSTULATED ACCIDENT CONDITIONS AND i THE LOADING REQUIRED TO PROPAGATE THE LARGEST PERMISSIBLE CRACK i 3) THE PRIMARY TO SECONDARY LEAK RATE LIMIT ' UNDER NORMAL OPERATION SHOULD BE LESS i THAN THE LEAK RATE ASSOCIAYED WITH THE LARGEST SINGLE PERMISSIBLE CRACK v _ _ _ . . _ _ _ _ _ ._ ._ ., - _ . _ _ . , _ . . _ . _ _ - . , _ . ... _ ., ., _ . ,.....__ .._, _ U.
WESTINGHOUSE P'.?"I'27 CLASS 2 !
- . REG. GUIDE 1.121 CRITERIA I i 1
BURST AND, LEAKAGE PLUGGED TUSE POTENTIAL LIMITS : FOR PROPAGATION l_ l (NEED FOR STABILIZATION) I ji BURST TESTS LEAKAGE RATES DENTED NON-DENTED
- WITH TSP RESTRAINT FOR SINGLE & SEGMENTED AT TSP'S AT TSP'S ;
CRACKS EFFECT ON BURST or SSE AND t ALIGNMENT STRESSES i ACTIVE Tuss PGTENTIAL ', FOR PROPAGATION (CRACK LENGTH LIMIT) i I I NORMAL ACCIDENT , OPERATION t COND m ONS I 3D T/H ANALYSIS ' ' i SSE + SLB , SSE + LOCA TUBE FIV ANALYSIS , i
i i NORTH ANNA 1 l R.G. 1.121 EVALUATION 4
SUMMARY
OF RESULTS o CIRCUMFERENTIAL CRACKS STAB'N CRITERIA TUBE INTEGRIlY HEAT / COOL FIV BURST LEAK 9 50 GPD ! (DEG.) (DEG.) (DEG.) (DEG.) 1 -
. O,c 1
l J e AXIAL CRACKS i TUBE INTEGRITY i BURST LEAK 050 GPD
- (INCH) (INCH) s,6. c
- .J 1
4
. - - . _ , .w- , , - - . - - . . . . , , .
1 TTS CIRCUHFERENTIAL CRACKING ' STABILIZATION CRITERIA Tw0 MECHANICAL CRACK PROPAGATION MECHANISMS: { 0 AXIAL LOADING DUE TO HEATING / COOLING (TUBES PLUGGED & DENTED OR FIXED AT TSP) 0 FIV INDUCED LOADINGS (ALL TUBE SUPPORT CONDITIONS) l l l
l l TTS CIRCUMFERENTIAL CRACKING HEATING /C0OLING CRACK PROPAGATION CRACK MORPHOLOGY: l 0 100% THROUGH WALL 0 LIMITED CIRCUMFERENTIAL EXTENT 0 WITH OR WITHOUT LIGAMENTS MECHANISM CONSIDERATIONS: 0 AXIAL FORCE RESULTS IN PLUGGED TUBE DUE TO PRESSURE AND THERMAL EFFECTS 0 TUBE IS COOLER THAN SURROUNDING TUBES AND UNPRESSURIZED O TUBE IS FIXED AT TSP 0 CRACK GROWTH OCCURS DUE TO INDUCED AXIAL LOAD FROM: 0 HEAT-UP/ COOL DOWN O LOAD FOLLOW 0 SELECTED UPSET CONDITIONS l
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-,-a 4- . A A J a .~ a.w 4 .- W 4.- - - e - ..-. --m -- w w -
i LOAD FOLLOW TYPE LOADINGS - CRACK ANGLE VS CYCLES
. s,c,e
!S E
d 8 a 0 i W CYC11S l l l l
NORTH ANNA-1 4 I i ACCEPTABLE FOR FULL CYCLE OPERATION I ! e AXIAL CRACKS OUTSIDE TSP CRACK LENGTHS CONSISTENT WITH l LAST 2 CYCLE EXPERIENCE e CIRCUMFERENTIAL CRACKS AT WEXTEX EXPANSION 100% RPC PERFORMED: 0 INSPECTION SENSITIVITY IDENTIFIED CRACKS PRESENT OVER PREVIOUS , i OPERATING CYCLES : PROJECTED CRACK ANGLES MEET R.G.1.121 l CRITERIA
- l OPERATING LEAKAGE LIMIT RETAINED AT 50 GPD l 9
BURST CAPABILITY FOR CIRCUMFERENTIAL CRACKS AT l TSPS I 100% 8X1 PERFORMED AT PRINCIPAL TSP l ELEVATIONS l
- i CRACKS IDENTIFIED TO BE PRESENT OVER PRIOR ,
1 OPERATING CYCLES l PROJECTED CRACK ANGLES MEET R.G.1.121 CRITERIA l i l l
TTS CIRCUMFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL i DUE TO FIV INDUCED LOADINGS CRACK HORPHOLOGY: e 100% TUROUGH WALL e LIMITED CIRCUMFERENTIAL EXTENT e NO LIGAMENTS MECHANISM CONSIDERATIONS: e LOCATION DEPENDENT T/H QUANTITIES (ATHOS) e TUse SUPPORT CONDITION e PINNED TSP
- e OPEN TSP e
FIXED TSP (MOST LIMITING) e EXCITATION MECHANISMS: o TURBULENCE e FLUIDELASTIC (MOST LIMITING) e DAMPING (VISCOUS & MECHANICAL) e CRACK DAMPING NOT INCLUDED IN PRESENT EVALUATION e CRACK DAMPING TESTS CURRENTLY BEING PERFORMED
__._.m +-= a _w.---u.4#&#s-A.Am_---.A m.Ja., s.h _Aa/_4% _.,a u w a _6a d.-. _&-- a.._._ .a u p_.. _ ~a# 4 a ,mm,y.- m--, m - ___ - - - - - - - TTS CIRCUMFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL DUE TO FIV INDUCED LOADINGS GENERAL EVALUATION PROCEDURE: a, c. s l l
i T TTS CIRCUMFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL ! DUE TO FIV INDUCED LOADINGS e FLUIDELASTIC STRESS CALCULATION: _ , a, c, e L s e STEADY STATE AMPLITUDE OF VIBRATION IS SOLVED
^ "'
E FROM STABILITY RATIO - U /Uc =[ [
TTS CIRCUMFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL DUE TO FIY INDUCED LOADINGS e WHERE: Us = EFFECT VE E ,'0 CITY
= (RHO D /M) '3 *U UC = CRITICAL VELOCITY
= BETA f D [2 PI ZETA ( X )3 0 5 e AMPLITUDE OF VIBRATION AND MODE SHAPE USED
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4
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l TTS CIRCUHFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL l DUE TO FIV INDUCED LOADINGS FIV CRACK' PROPAGATION THRESHOLD:
- de c6 a e THRESHOLD IS A FUNCTION.0F: ,, t, e
! e AXIAL LOADINGS DIFFERENT FOR PLUGGED & NON-PLUGGED-TUBES (PLUGGED-TUBE MORE SEVERE Dus l TO TEMPERATURE DIFFERENCES) e THRESHOLD KI VALUES FROM PUBLISHED TEST DATA i e INCLUDES SCC TO FATIGUE CRACK EFFECTS l (MULTIPLE CRACKS TO SINGLE CRACK) l l
TTS CIRCUMFERENTIAL CRACKING CRACK PROPAGATION POTENTIAL DUE TO FIV INDUCED LOADINGS e FOR A GIVEN ANGLE THE FOLLOWING STRESSES WOULD BE REQUIRED FOR CRACK PROPAGATION To OCCUR: TOTAL CRACK FE CRACK PROPAGATION THRESHOLD STRESS PLUGGED & NONPLUGGED & ANGLE DENTED DENTED e, c, e 90 DEG. 180 DEG. 270 DEG. 350 DEG. e THE SMALLEST ANGLE AT _Wp((H FIV BECOMES A CONCERN IS FOR PLUGGED AND DENTED AND _ j/dk NON-PLUGGED AND DENTED
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)
STABILIZATION CRITERIA: e SAME AS TTS PROCEDURE e CONSERVATIVE: e CROSS FL0w FLUID VELOCITIES NOT AS SEVERE AS THOSE AT THE TUBESHEET ELEVATION e DENSITIES NOT AS LARGE 1
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SUMMARY
OF STABILIZATION CRITERIA FOR CIRCUMFERENTIAL CRACKS - N. ANNA 1 1 , THREE CHECKS I l 1) LOAD FOLLOW TYPE LOADS: e _IF SINGLE CR IS GREATER THAN TABILIZE TUBE e l IF LIGAMENTS EXIST.IN CRACK - CALCULATE i TIME REQUIRED To REACH RAPID Cp CK GROWTH ANG_LE OF,_ ,, , IF TIME IS LESS THAN -
$TABILIZE TUBE
- .a
- 2) FIV LOADINGS:
e l IF SINGLE CR g IS LESS THAN i l _ TUBE OK FOR FIV e IF SINGLE C IS GREATER THAN HECK TUBE AGAINST
~ STRESS MAP To DETERMINE ACCEPTABILITY e
IF LIGAMENTS EXIST IN CRACK -
- o, c. e i 3) i HULTIPLE CIRCUMFERENTIAL INDICATIONS WITHIN SINGLE SPAN SEPARATED BY SOME AXIAL DISTANCE - STABILIZE TUBE, INCLUDING:
j e CLOSE INDICATIONS a, c. e 1 e l FAR INDICATIONS (AT DIFFERENT SITES' I.E., TSP 1 AND TTS) l l 1
TUBE INTEGRITY CONSIDERATIONS O CIRCUMFERENTIAL CRACKING IN EXPANSION TRANSITIONS AT THE TOP OF THE TUBESHEET 8 AXIAL CRACKING EXTENDING OUTSIDE THE TUBE SUPPORT PLATES (TSP'S)' l l c . . . , . , a v=
4 ,_a.-.m.aAA-.-. 4 Aa..+. .ahA_m
. m._.. --.4,.,.a.-a_h4.._.a 4 ,aawa.Ana - *. - ,+.Ae-J.,- -.4-*- aka4-a e .-- Ad..e h--sJEa*h w4 eA a.< d- - _ - .+$4 l
REG. GUIDE 1.121 EVALUATION FOR CIRCUMFERENTIAL CRACKING IN EXPANSION TRANSITIONS i e DETERMINE CRITICAL CRACK LENGTHS ACCOUNTING FOR SEGMENTED CRACKS TUBE BURST STRENGTH TUBE LEAKAGE RATE e CONFIRM ACCEPTABILITY OF OPERATING LEAK RATE LIMIT (LEAK BEFORE BREAK)
~
4 CONFIRM END OF CYCLE (EOC) 5URST CAPABILI EOC LENGTH OF INDICATIONS 1
-m ,
9 4
l l t BURST STRENGTH OF TUBING-WITH CIRCUMFERENTIAL CRACKS BURST TESTING e ROOM-TEMPERATURE (RT) TESTS OF 7/8 X 0.050 INCH: TUBING OF MILL ANNEALED ALLOY 600 MkTERIAL e WITH CIRCUMFERENTIAL THRU-WALL EDM SLITS SEALEDWITHA[ _g
~
TO AVOID PREMATURE BLADDER fXTR SION l e TUBES WITH SINGLE THRU-WALL SLITS-AND WITH COLINEAR 0.3 INCH SLITS SEPARATED BY LIGAMENTS
BURST PRESSURE VERSUS TOTAL CRACK ANGLE 7/8X0.050 INCH TUBING _ ,jg E x t.U 5 W W a. 5 m l TOTAL CRACK RNGLE, DEGREES -- J 4
BURST PRESSURE VERSUS TOTAL CRACK ANGLE 7/8XO.050 INCH TUBING WITH TSP RESTRAINT _ ,j,e E x tb a b l
~
TOTAL CRACK ANGLE. DEGREES
4 I_m- - .2 e . _ - BURST PRESSURE VERSUS TOTAL CRACK ANGLE 7/8XO.050 INCH TUBING WITH TSP RESTRAINT
- A f k C, CA x
LU w a. (h 5 m TOTAL CRACK ANGLE. DEGREES b i i i
-- -- - - - _ ._.- - = - -. - . . . . - . - _ _ _ _ _ BURST STRENGTH OF TUBING WITH CIRCUHFERENTIAL CRACKS CRITICAL CRACK ANGLE FOR LTL STRENGTH AT 650F e SINGLE CRACKS PRESSURE CRITICAL LIMIT ANGLE (PSI) (DEGREES) s, b , c 4200. 2650. e SEGMENTED CRACKS CAPABILITY EXCEEDS-4200 PSI WITH ' O.020 OR LARGER LIGAMENTS UP.TO A CRITICALANGLE-0F} ]#' 1
, - - , - , . . - . . -.m,
LEAKAGE FROM TUBES WITH CIRCUMFERENTIAL CRACKS LEAK RATE TESTS e OPERATING TEMPERATURE AND PRESSURE TESTS ON 3/4 X 0.043 INCH ALLOY 600 TUBING (TUBE SIZE EFFECT NOT SIGNIFICANT) e CRACKS GENERATED BY FATIGUE USING FOUR POINT LOADING e OPENING AND CLOSING BENDING MOMENTS APPLIED LOWER BOUND LEAK RATE RELATIONSHIP DEVELOPED e Q= . ,,6 c WHERE P = A = DIFFERENTIAL PRESSURE (PSI) CRACK ANGLE. (INCH) -
l
. i LEAK RATESEGHENTED VERSUS CIRCUMFERENTIAL CRACK CRACKS IN 7/8X0.050' TLGING
,4g E
e tb E x s b TOTAL CRACK NETWORK ANGLE. DEGREES - i l
LEAKAGE FROM TUBES WITN CIRCUMFERENTIAL CRACKS CRACK LIMITS AT 50 GPD LEAK RATE LIMIT l e SINGLE
" CRACK EXTENT WOULD BE LIMITED T0 #> 8 , .. J e
SEGMENTED CRACKS HAVE AN EXPECTED ASPECT RATIO OF-BETWEEN 4/1 AND 6/1 BASED ON PRIOR PULLED TUBE EXAMINATIONS.THE EXTENT OF SEGMENTED THRU-WALL CRACKS WOULD THEREFOREB,kfpITEDT0-LESSTHAN ? 4 l I i I i j
i NORTH ANNA UNIT 1 S/G A TOP OF TUBESHEET CLRC. IND. 25 20-w W . O Z '
<C Z
15-l LL
- O T 10-W CD 2
D 5-O i 0 to 30 i 30 to 60 a 60 to 90 i 90 to 120 i III 120 to 150 i i i 180 to 210 i 240 to 270 150 to 180 210 to 240 COMBINED ANGULAR EXTENT (SCI + MCl)
NORTH ANNA UNFF 1 S/G B TOP OF TUBESHEET CIRC. IND.
- 25 l
l
- 20-ca w
O i Z ' I l-- 15-i CD ! _Z._ u_ i O [ 10-4 W i CD - 2
- a
! 5-0 i i i i i i i i i i i E i 0 to 30 60 to 90 120 to 150 180 to 210 240 to 270 300 to 330 30 to 60 90 to 120 150 to 180 210 to 240 270 to 300 330 to 360 i COMBINED ANGULAR EXTENT (incl. lig.)
NORTH ANNA UNIT 1 S/G C 2/91 DATA . TOP OF TUBESHEET CIRC. IND. 30 $ 25- ! m o. Z 20-F 2 [ 15-
- o CD 10-n I H h..
D O to 30 60 to 90 120 to 150 180 to 210 240 to 270 300 to 330 30 to 60 90 to 120 150 to 180 210 to 240 270 to 300 330 to 360 COMBINED ANGULAR EXTENT (incl. lig.)
j REG. GUIDE 1.121 EVALUATION FOR AXIAL CRACKING EXTENDING OUTSIDE TSP THICKNESS ! 9 DETERMINE CRITICAL CRACK LENGTHS ACCOUNTING FOR SEGMENTED CRACKS' TUBE BURST STRENGTH TUBE LEAKAGE RATE 9 4 CONFIRM ACCEPTABILITY 0F OPERATING LEAK RATE LIMIT (LEAK BEFORE BREAK) 9 CONFIRM END OF CYCLE (EOC) BURST CAPABILITY EOC LENGTH OF INDICATIONS i i k i i
BURST STRENGTH OF TUBING WITH AXIAL CRACKS BURST TESTING e PRIOR TESTING OF TUBES WITH AXIAL THRU-WALL EDM SLITS WAS PERFORMED WITH BLADDER SEALS THAT AT TIMES EXTRUDED THRU THE EDM SLITS PRIOR TO FULL RUPTURE OF THE TUBE e DATA FROM-NON-SEALED TUBES WITH THRU-WALL SLITS IS NOW AVAILABLE AND CONFIRMS HIGHER BURST CAPABILITY (LABORELEC, P. HERNALSTEEN) TESTS PERFORMED IN BRANCH LINE OF A PRESSURIZED SYSTEM WITH HIGH FLOW CAPACITY DATA HAS BEEN NON-DIMENSIONALIZED AND COMPARED TO PRIOR DATA l
,,-,-n-m--r- -
.-----.m--.,. , ,._
NORMAllZED BURST PRESSURE VS. CRACK LENG I600 MR 8 TT AND 1690 TT _ o, /, c 9 s S e E a . 5 m 8 Ci e i NORMALIZED CRACK LENGTH CLRM3DR) I l
.- -=- - - - .
i BURST PRESSURE VERSUS CRACK LENGTH 7/8X0.050 INCH TUBING-SINGLE CRRCKS _ 3, j,, c E x ul 5 W a. 5 m
~
~
l RXIRL CRRCK LENGTH, INCH ~ 1
BURST PRESSURE VERSUS CRACK LENGTH __ 7/8X0.050 INCH TUBING WITH TSP CONSTRAINT _ ,,g e x LI) s 8 a. 5 m AXIRL CRACK LENGTH, INCH ~ l l W
l i BURST PRESSURE VERSUS CRACK LENGTH 7/8XO.050 INCH TUBING WITH ELASTIC LIGAMENTS
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uI e a. ui cr 53 l L ~ t RXIRL CRRCK LENGTH, INCH ~~ r 1
l l 1 ! BURST STRENGTH OF TUBING WITH AXIAL CRACKS t CRITICAL CRACK LENGTH FOR LTL STRENGTH AT 650 e SINGLE CRACKS WITH TSP CONSTRAINT PRESSURE CRITICAL LIMIT LENGTH (PSI) -(INCH)
, . a, b, e 4200. ~
i 2650. e SEGMENTED CRACKS WITH ELASTIC LIGAMENTS PRESSURE CRITICAL LIMIT LENGTH (PSI) (INCH)
- s, b. c i
4200. 2650. 1
b LEAKAGE FROM TUBES WITH AXIAL CRACKS AXIAL, CRACK LEAKAGE MODEL (CRA'XFLO) e ONE-DIMENSIONAL ANALYSIS OF A HOMOGENE0US FLUID ACCOUNTING FOR CHOKED FLOW, PRESSURE, TEMPERATURE, FRICTION AND TORTU0SITY e YIELDS A GOOD PREDICTION OF LEAK RATES COMPARED TO TEST. DATA FOR: FATIGUE AND STRESS CORROSION CRACKS; AWAY FROM AND WITHIN EXPANSION' TRANSITIONS i l l I w
f i i l COMPARISON BETWEEN PREDICTED S MEASUR '
,6c z i CL i S -
t
- LU W i 2 !
e x
< i w
a , i a L 1 w i H ! 4 a i
>-4 4
o w - g : i i i [ .f ! 1- ^ r MEASUED LEAK RATE [GPM. - t
LEAKAGE FROM TUBES WITH AXIAL CRACKS UNCERTAINTY ANALYSIS MEASURED VERSUS PREDICTED VALUES (M v5. P) A 4 BY LINEAR REGRESSION AND A STANDARD DEVIATION (50) DETERMINED THE LINEAR REGRESSION FIT IS ON A LOG-LOG PLOT OF THE VALUES IT THEREFORE RESULTS IN A FACTOR TO BE APPLIED TO THE PREDICTED VALUE NORMAL OPERATION
~ 1, b, e LOG-LOG SD = - ~
_ -, a, A c-H (OR ACTUAL) =
,. J FACTORS 1 SIGNA !'
2 SIGNA _, . , aeo i I L a. i i
. i
LEAK RATE VEASUS AXIAL CRACK LENGTH F 7/8X0.050' TUBING RT 1400 PSI _ ,,, j,, c i e a u} cr E
"i RXIRL CRACK LENGTH. INCH -
LEAK RATE VERSUS AXIAL CRACK LENGTH 7/8X0.050' TUBING RT 1400 PSI [ ,LERK RATE WITH ELBS"IC LIGAMENTS - 46c 2 e N E if
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NORTH ANNA 1 R.G. 1.121 EVALUATION
SUMMARY
OF RESULTS e CIRCUMFERENTIAL CRACKS STAB'N CRITERIA TUBL INTEGRITY HEAT / COOL FIV BURST LEAK @ 50 GPD (DEG.) (DEG.) (DEG.) (DEG.) n, t c i e AXIAL CRACKS TUBE INTEGRITY BURST LEAK 050 GPD (INCH) (INCH) e, 6 c
1 ) r . , 1 2 l 3 2 WESTINGHOUSE i i < i T. A. PITTERLE TUBE INTEGRITY ASSESSMENT i i i i i . i e . i J i i
TUBE BUNDLE INTEGRITY ASSESSMENT e GROWTH RATES AND OPERATING INTERVAL CONSIDERATIONS 4 l-i I i f 4
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f' CRACK GROWTH CONSIDERATIONS ' DETECTION THRESHOLDS 0 WEXTEX CIRCUMFERENTIAL CRACKS - RPC 230 BASED UPON WEXTEX WOG STUDY 0 TSP CIRCUMFERENTIAL CRACKS - 8X1 450 BASED UPON DISTANCE BETWEEN COIL CENTERS 0 TSP AXIAL CRACKS - BOBBIN COIL 0.2" DETECTABLE CRACK LENGTH AVERAGE GROWTH RATES O WEXTEX CIRCUMFERENTIAL CRACKS 450 BASED UPON 8X1 AVERAGE OVER 3 S/G 0 TSP CIRCUMFERENTIAL CRACKS 590 BASED UPON 8X1 AVERAGE OVER 3 S/G 0 TSP AXIAL CRACKS 0.10" FROM 1989 BOBBIN COIL RESULTS ! EDDY CURRENT UNCERTAINTY 0 WEXTEX CIRCUMFERENTIAL CRACKS 220 BASED UPON WEXTEX WOG STUDY 0 TSP CIRCUMFERENTIAL CRACKS 450 BASED UPON 1 COIL HIT 0 TSP AXIAL CRACKS l 0,08" UNCERTAINTY ON LENGTH
CRACK GROWTH CONSIDERATIONS PROJECTED EOC AVERAGE CRACK SIZES 0 WEXTEX CIRCUMFERENTIAL CRACKS ~900 0 TSP CIRcVHFERENTIAL CRACKS ~1490 0 TSP AXIAL CRACKS ~0.38" ESTIMATED E0C MAXIMUM CRACK SIZES O WEXTEX AND TSP CIRCUMFERENTIAL CRACKS SINGLE CRACK ANGLES WITH LIGAMENTS BELOW RPC DETECTABILITY OF ~0.1" ARE EXPECTED < TO BE LESS THAN 3- P BURST ANGLE OF
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4 WEXTEX-CRACKS EXCEEDED THIS LIMIT IN 1991 DATA NO TSP CIRCUMFERENTIAL CRACKS EXCEEDED THIS LIMIT IN 1991 DATA 0 LARGEST CRACK ANGLE WAS 2120 : IN S/G C 0 TSP AXIAL CRACKS MAXIMUM CRACK LENGTH s 0.80" FOUND IN 19911 INSPECTION MEETS P BURST OF 44c FOR SEGMENTED CRACK MODEL P
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NORTN ANNA-1 ACCEPTABLE FOR FULL CYCLE OPERATION l e AXIAL CRACKS OUTSIDE TSP CRACK LENGTHS CONSISTEh r WITH LAST 2 CYCLE EXPERIENCE o CIRCUHFERENTIAL CRACKS AT WEXTEX EXPANSION 100% RPC PERFORMED: e INSPECTION LENSITIVITY IDENTIFIED CRACKS PRESENT OVER PREVIOUS OPERATING CYCLES PROJECTED CRACK AN';LES HEET R.G.1.121 CRITERIA OPERATING LEAKAGE LIMIT RETAINED AT 50 GPD BURST CAPABILITY FOR CIRCUHFERENTIAL CRACKS AT TSPS 100% 8X1 PERFORMED AT PRINCIPAL TSP ELEVATIONS CRACKS IDENTIFIED TO BE PRESENT OVER PRIOR OPERATING CYCLES PROJECTED CRACK ANGLES HEET R.G.1.121 : CRITERIA I 1 l 1 l l 4
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l OPERATING INTERVAL CONSIDERATIONS PROJECTED E0C 9 SINGLE AXIAL AND CIRCUMFERENTIAL CRACKS HEET R.G. 1.121 CRITERIA. NO CURRENTLY IDENTIFIABLE LIMIT THAT WOULD PRECLUDE CYCLE 9 OPERATION TO THE HEXT INSPECTION. ADDITIONAL ASSESSMENTS REQUIRED TO ESTABLISH ACCEPTABLE OPERATING INTERVAL TO NEXT INSPECTION e POTENTIAL FOR BURST PRESSURE REDUCTION DUE TO COMBINED AXIAL PLUS CIRCUMFERENTIAL CRACKS e POTENTIAL FOR CRACK PROPAGATION OF CIRCUMFERENTIAL CRACKS DUE To TusE VIBRATION LOWER TSPS TOP TSP e POTENTIAL LEAKAGE DURING SLB FOR EOC CRACK DISTRIBUTION S
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NORTH ANNA UNIT 1 , STEAM GENERATOR TUBE CORROSION ISSUES PRIOR TO 1991 i ( R0W 1 U-BEND PWSCC - ALL TUBES PLUGGED A CYCLE LEAKAGE EVENT (282) DENTED TSP SCC - 457 TUBES Pl.UGGED TO DATE; BORIC ACIO TREATHENT IN PLACE TO CONTROL DENTING EXPANSION TRANSITION PWSCC - 73 TUBES PLUGGED; l' RPC TESTING OF ALL NOT LEG TUBES PLANNE FATIGUE-RELATED CRACKING - 1 TUBE LEAK, 166 TUBES PREVENTIVELY PLUGGED, 88-02 ANALYSIS PERFORMED TO LIMIT FURTHER EVENTS AVB WEAR - 3 TULES PLUGGED, SLOWLY PROGRESSING DEGRADATION RATE l ODSCC ABOYE TUBESNEET - 51 TUBES PLUGGED SURVEILLANCE CONTINUED DURING ISI i
NORTH ANNA UNIT 1
SUMMARY
OF STEAM GENERATOR OPERATING HISTORY l STEAM GENEMTORS: SERIES 51 (3) STEAM GENERATOR TUBING: 1600 (MA), 3388/SG - INITIAL CRITICALITY: APRIL 5, 1978 COMMERCIAL OPERATION: JUNE 6, 1978 CURRENT FUEL CYCLE OF OPERATION: 8 . SECONDARY SIDE CHEMISTRY: AVG SINCE INITIAL - STARTUP; BORIC ACID ADDITIONS TO CONTROL DENTING SINCE JANUARY 1980 i CURRENT TUBE PLUGGING LEVELS: S/G TUBES PLUGGED A 353 (10,4%) . B 269 (7.9%) ' C 445 (13.1%) TOTAL 1,067 (10.5%)
. Tuns PLUGGING ATTRIBUTIONS t PREVENTIVE (Row 1): 280 ParvenTxvE '(AGAINST FATIGUE): 166 PREVENTIVE (AROUND FAILED PLUG): '7 PWSCC (AT TSPs): PWSCC (WEXTEX): 457 PWSCC (U-BEND, 73 Rows 1 AND 2): 5
' 0.D. ATS:
O.D. TSP: 51 AVB-WEAR: 2 FATIGUE: 3 .I 1 TSP COLD LEG PERIPHERAL Tuar THINNING 1 CoLo LEG (OTHER) : HISCELLANE00s 2 19 . TOTAL 1,067 4 8 4
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i North Arma Unit 1 Steam Generators - Tube PWgging History by Year and By Attributed Cause Plugging Attributed Oate Number of Tubes P,,fyggirig_p.gjig _ , , _ . . Ploooed ,
$/O $G S/G
_6 __t ._Q 191e! November 1974 Preventive - Row 1 94 94 92 260 PWSCC - Row 1 0 0 2 2 Miscallaneous ,,,Q ,,2 _Q .,_2 Totals 94 94 96 264 January 1984 TSP PWSCC 0 4 4 6 OO.ATS ,Q _q Totals l ,3, 0 4 5 9 July 1964 TSP PWSCC 10 1 5 16 f August 1985 TSP PWSCC 12 0 0 12 Miscellaneous _j, .2 .g ,1 Total 13 0 0 13 November 1985 TSP PWSCC 9 16 44 69 00 ATS 0 1 -1 2 Miscellaneous ,Q _,, Q ,_2 ,,,2 Totals 9 17 47 73 May 1987 TSP PWSCC 68 ' 49 107 224 Wextex PWSCC 15 13 7 38 OO ATS 0 0 2 2 U Bend Row 2 PWSCC 0 0 1 1 Miscenaneous ,,_ q _,, 9 1 1 Totals 83 62 118 263 l l l l l l l l l A070$:1b421491 I
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North Anne Unit 1 Steam Generators - Tube Plugging History by Year and By Attributed Cause Plugging Attributed Number of Tubes Date Pfuoalno Cause Muooed . _ _ _ S/0 S/0 8/0 A ,_t _Q I,qigj July 1987 TSP PWSCC 6 8 7 21 TSP Cold Leg Thinning 1 0 0 1 Wertex PWSCC 2 3 $ 10 OD ATS 12 9 22 43 l Preventive (Against Fatigue) 80 12 70 162 Fatigue 0 0 1 1 Cold Log (Other) 2 0 0 2 3 ,. Miscellaneous ,__2 ?, 4 J Totsis 105 39 109 253 ' Apni 1989 TSP PWSCC 28 37 42 107 Wextex PWSCC 11 8 9 28 OD ATS 0 1 2 3 TSP OD SCC* 0 ,0 2 2 AVB We'ar 0 2 .1 3 U Bend (Row 2) PWSCC 0 2 0 2 Preventive Against Fatigue 0 2 2 4 Preventtve Atound Failed Plug ,,Q _.Q _,I 7 Tokle 39 52 65 156 i x0F09:1b421sti
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t NORTH ANNA UNIT 1 STEAM GENERATOR INSPECTION RESULTS FEBRUARY 1991
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NORTH ANNA 1 FEBRUARY 1991 1 TUBE PLUGGING ATTRInuTIoNS STEAM GENERATOR ATTRIBUTION A B C CIRCUHFERENTIAL INDICATIONS 29 16 47 AT SUPPORT PLATE i WEXTEX TRANSITION 52 56 107 AXIAL OR CIRCUHFERENTIAL AXIAL IHorCATIONS 73 79 92 AT SUPPORT PLATES SLUDGE ZONE ABOVE 30 5 14 EXPAHSION TRANSITION OTHER 6 0 0 TOTAL 156 260 190 l
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l t NORTH ANNA UNIT 1 STEAM GENERATOR TUBE LEAKERS FEBRUARY 1991 TUBE LEAKAGE OF THE ORDER OF 15 GPD DURING THE REFUELING. LAST 5 H0HTHS OPERATION PRIOR TO LEAK CHECKS PERFORMED DURING THE,l5ICONFIRME LEAKAGE FROH 8 TUBES AS ,FO,LLOWS * . , , , - 5/G A NDE RESULTS R1709-1H LARGE BOBBIN SIGNAL, 8 X 1, SINGLE-CRACK R24052-TSH 135 DEG. CIRC CRACK (14 V)' R8053-5H LARGE BOBBIN SIGNAL, TWO AXIAL CRACKS R11066-TSH 189 DEG. R11071-TSH CIRC CRACK (14 V) 125 DEG. CIRC CRACK (8 V) S/G B R37C75-1H L1RGE BOBBIN SIGNAL, 8 X 1, HULTIPLE AXIAL CRACK R2086-1H LARGE BOBBIN SIGNAL, MULTIPLE AXIAL CRACK S/G C R26C60-TSH 204 DEG. CIRC. CRACK (8 V)
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NORTH ANNA UNIT 1 FEBRUARY 1991 DETECTION OF CIRCUMFERENTIAL TSP INDICATIONS THE FINDING OF VOLUMETRIC-ORIENTED EC INDICATIONS IN THE DENTED TUBE SUPPORT REG ON THE NOT LEG WAS A NEW OBSERVATION IN 198 8 x 1 INSPECTION OF ALL 3 STEAM GENERATO PERFORMED TO ASSIST THE BOBBIN PROBE IN"~~ ~
' IDENTIFYING AFFECTED TUBES.ALL POSSIBLE INDICATIONS FOUND BY 8 X 1 AND ALL DISTORTED OR > 40% B0BBIN INDICATIONS WERE VERIFIED B RPC TESTING - 538 INDICATIONS. ,
105 INDICATIONS WERE ASSESSED AS EXHIBITI CIRCUMFERENTIAL BEHAVIOR; ALL WERE IDENTIFIED BY THE 8 X 1 PROBE, AND NONE WAS FOUND AMONG THE OTHER 433 INTERSECTIONS EVALUATED AT TUBE SUPPORT LEVELS USING THE RPC PROBE. 60 COI: ID - LOOKING CRACK-LIKE SIGNALS 45(%): OD - LOOKING VOLUMETRIC SIGNALS THESE WERE TREATED AS PLUGGABLE' INDICATION EVALUATED WITH RESPECT TO NEED FOR STABILIZ
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$INCE RPC DATA- IS NOT AVAILABLE FOR 1989, 8. x 1 DATA l ANALYSIS WAS FORCE-FIT TO SIGNALS PREVIOUSLY REGARDED i
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l . NORTH ANNA #1 FEBRUARY 1991 l 8 x 1 GROWTH ESTIMATES FOR SUPPORT PLATE CIRCUMFERENTIAL INDICATIONS CHANGE IN NUMBER STEAM GENERATOR OF COILS HITS A B C NUMBER OF INSTANCES j 0 6 7 12 ' 1 10 5 27 2 12 5 12 3 3 2 4 4 0 0 2 5 0 0 0 6 0 0 1 1 7 0 0 0 8 0 0 0 WEIGHTED AVERAGE 1.3 - 1.1 1.6 CHANGE EQUIVALENT CHANGE 590 500 720 l IN ARC LENGTH
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NORTH ANNA UNIT 1 S/G A 2/18 DATA TOP 0F TL9EsNtti CitCUMf tttNTI AL IslCAT10Ns itCV ICA stLOC IN1 silWD 14 23 Tsu Total Ang. Theta 1 Theta 2 Lig 1 ,Lig 2 0.2 sci 69 69 12 24 TsN *0.2 $CI Se 84 13 24 isN 0.1 SCI 96 96 16 24 1sN 0.1 SCI 88 88 7 25 ism o sci 57 57 16 25 ism 0.1 SCI 85 85 20 25 1sN 0.1 sci 141 181 11 26 isN 0.1 sci 82 82 8 27 isN 0.1 SCI 41 81 16 28 ism +0.1 SCI 100 100 18 28 1su 0.4 SCI 50 50 17 29 1sN 0.1 SCI 74 74 18 29 ISM 0.1 MCI 207 109 63 35 22 29 isN *0.1 SCI 64 64 17 30 isN 0.2 sci 162 162 20 30 isu 0.1 sci 195 195 8 31 TSN 0.1 SCI TT 77 18 31 isN 0.2 SCI 247 247 9 32 f$N 0.2 SCI 216 216 17 32 1sN 0.2 SCI 1C2 102 18 32 isN 0.1 SCI E3 83 9 33 ism 0.2 SCI 75 75 19 33 Ts= 0.3 SCI 19 19 19 34 ftu 0.1 MCI 177 71 82 24 24 35 isN 0.1 sci 101 101 l 23 36 isN 0.1 sci 105 105 21 37 Tsu 0.1 MCI 166 102 55 9 25 37 TSN 0.1 SCI 74 74 . 18 38 1sN 0.1 sci 80 80 21 40 isN 0 SCI 192 192 19 42 TsN 0 SCI 154 154 25 50 isN 0.2 SCI 87 87 13 52 tsN 0.1 SCI 136 136 14 52 isN 0.2 SCI 62 62 22 52 isN 0.2 SCI 64 64 24 52 tsu 0.1 SCI 135 135 16 53 tsu o SCI 114 114 18 53 isu o SCI 86 86 26 55 isN 0.2 sci 68 88 24 56 isu 0.1 sci 99 99 14 58 ism 0.2 SCI 70 70 15 60 TSN *0.1 SCI 69 69 13 62 isN 0 SCI 121 121 25 62 isN 0.1 SCI 121 121 2 63 TsN 0 sci 72 72 11 66 75N 0 SCI 189 189 6 70 TsN *0.1 SCI 91 91 11 71 TSN *0.2 SCI 125 125 10 74 isN 0.1 SCI 172 1 72
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NORTH ANNA #1 - FEBRUARY 1991 8 X 1 GROWTH ESTIMATE FOR WEXTEX CIRCUMFERENTIAL INDICATIONS i l i CHANGE (6) IN NuMaER STEAM GENERATOR OF COIL HITS A B i C 1, HUMBER OF INSTANCES 0 i 27 10 42
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