ML20203A175

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Interim Rept of Evaluation of Eddy Current Probes for Once- Through Steam Generator Sleeve Exam
ML20203A175
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 06/28/1985
From:
BABCOCK & WILCOX CO.
To:
Shared Package
ML19292F311 List:
References
A0374, A374, NUDOCS 8604160248
Download: ML20203A175 (23)
v • d • e


Text

{{#Wiki_filter:, 2 THE BABCOCK & WILCOX COMPANY Pown omatAnoM 9000P REVISIONS "m'C** * .a = .c. - Igs i !.r I I 8 e t i I.i != !!;{ eli 4

  • g INTERIM REPORT OF THE i*!

EVALUATION OF EC PROBES FOR t :3 i* OTSG SLEEYE EXAMINATION 8I I P

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PDR ADOCK 05000313 PDR ega P .g A3074 p Page 1 5 c-E-y I e-fy' e.,aW EVALUATION 0: EC PROBES FOR

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m THE RABCOCK & WILCCX COMPANY PoWEt GENEtADON OROUP navisioNS C ' 8 &.: g;g

1.0 INTRODUCTION

s :: -ll! The present system for inservice inspections of OTSG sleeved tubes ,, i employs the use of a standard

=3 diameter bobbin coil probe and the

!(Reference 7.1). The system has been shown eej to be able to detect a 40% through wall (TV), ASME size hole in the sleeve or parent tube at the expansion transitions; however, a flaw at

  • 1:

!i this location cannot be sized with any level of confidence. .;*{ present system cannot detect a 40% TW, ASME size hole in the parent The g* tube at the sleeve end. The purpose of this evaluation is to identify a, a probe system with improved sizing capabilities at the expansion i2 transitions and which will detect a 40% ASME size hole in the parent ii tube at the sleeve end, as a minimum. The probe system will be further {g evaluated and documented in the final report. !I 2.0

SUMMARY

a! j) Of the three probes evaluated, the

g offered the best results. Initial evaluation of this probe used with indicates a 40% TW,' ASME hole in
  • i the parent tube at the sleeve end can be detected. This system also jg[j yielded a large improvement in the signal to noise ratio for flaws at y :

the expansion transitions, thus enhancing detection and sizing ",I o capabilities at these areas. It is recommended that ol,j probe be further evaluated for field deployment. a lfl 3.0 EVALUATION PROGRAM ..e wII 8I3 EE! Oe* E.! t ;

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tubing. The coil arran'gement is such " hat the interfering signals from t llg 360* tube expansions at support plates are suppressed. The thought I,l that a 360' sleeve expansion would also be suppressed was addressed; o however, the probe could not detect any of the ASME size holes in the 'ge y ,d parent tube or sleeve free span. The probe was tested with the a the same negative results. This probe design j,j = was considered to be unsatisfactory for further evaluation for sleeved ,, j tube applications. 1.s e'= g 1.! A3074 Page 2 I EVELU* TION 7 EC D UEES FOR ua m

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= THE BABCOCK & WILCCX COMPANY POWR GENMADON OROUP navisio ns "t, - .c..m s t.' sgl The standard ) diameter differential bobbin coil was modified irj by i design was used to increase the sensitivity of the bobbin coil. $;;i Evaluation of the probe did indicate an increase in signal amplitude of 35' approximately 17% to parent tube flaws over the standard bobbin coil, e!3 However, the residual sleeve end signal from every mix generated was

j too large to detect a 40% TW, ASME size hole at the sleeve end.

Based ', j i on these results and the promising results obtained by the

I
l; probe (discussed below), the probe was not

=, considered satisfactory for further evaluation. hf. The probe did show favorable results; therefore, all i2 further evaluations are based on this probe. Figure 1 is a sketch jg showing the coil configuration of thef probe used for this

i evaluation. The probe evaluated contained ei e.

5! (See Figure 2). Thi- ~ _j;, circumference. s 8:! i! .i o:ga on sit s!! e? a II of the probe. ,II 8 ji" Flaw M (Figure 3), a 40% ASME hole in the parent tube at the center of a;' an expansion, is easily detected and is located adjacent to and at the

'i same circumferential position as flaw N, the 40% hole at the sleeve

~:g 5'i h'&n ,/ !'l8 8 -u The evaluation of the . probe consisted of examining the r'g:

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calibration standard shown in Figure 3 using the Results of the j,;= holes at expansion transitions in parent tube and sleeve respectively) probe inspection of flaws A and B, (40% ASME .gu .bn i l A3074 Page 3 EVALUATION OF EC DRCBES FOR e.. =c u s em 5 '?a /6: c g r:;r . : p., ' ~ - "

i THE RABCOCK & WILCOX COMPANY { POWR OBdRADON 040W navisions

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  • "".m Ene g.g and flaw N (40% ASME hole in parent tube at the sleeve end) were

!!t"r! compared to the present coil inspection of these areas. g-! 4.0 RESULTS ge: Figures 4 through 7 illustrate the detection capabilities of the

g!

standard bobbin coil exam, presently used, at the expansion transitions. 'I" The 40% ASME holes can be detected only by cor4aring the

EI composite signals to a defect free expansion. The flaws cannot be i

i"2 sized (quantification of flaw depth) using the bobbin coil system. 'f Figures 8 through 13 illustrate the much improved detectior g ig capabilities of the probe at the expansion transitions. g Two different expansion suppression mixes are shown. The flaw signals {g are clearly distinguishable without the need for comparison to a defect free expansion. The nearly undistorted flaw signals indicate sizing of .gi flaws may be possible at the transition areas, however further study is gj needed to address this capability. lE The present bobbin coil inspection cannot detect a 40% ASME hole,in the it parent tube at the sleeve end. Figure 14 shows the probe

g signal from a 40% ASME hole in the parent tube mid span area. Figures g,j 15 through 28 show the EC signals from the composite sleeve end and il;r flaw N (top figure) and flaw M (bottom figure) using a i

sleeve end suppressing mix. Each progressive page shows the signals OE!! 8*A

  • 7$

,i* 8II E[f represent the sleeve end with no. interference from the defect signal. Both signals go up and to the lef t, then down almost to the point of g g,*[ origin, then way up to the left, and finally back down slightly. The composite signals from the flaw at the sleeve end at the other n,' i positions are compared to these two signals and to the signal from the

"I 40% parent tube flaw in Figure 14 for evidence of interference to the Ei.0 sleeve end signal due to the 40% hole.

g

  • !8 E85 eja II l.in cn iSE A3074 Page 4 l,..,

EvtLUAT0h if EC R?%ES FOR e-.

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THE BABCOCK & WILCOX COMPANY POWR CENRADOM OROUP nevaslONS "g* .u. 355 1 828 l Xit lYI 3;j 35 sg: s,- i ry: I l t&E , g.. a v i .e. 3 II i ca at I IE .i. '.I. f ti i Eis 2.7 u;I 1 p, - : t. on EI S Big s n!I i: g!! E g*

5.0 CONCLUSION

S ElI "j Of the three probes evaluated, the probe offers the best B gj examination of the sleeve end and expansion areas. Iai j!ju A significant improvement over the present bobbin coil system for .E detecting ASME size holes at the sleeve end and expansion areas was y 3s obtained with the probe. e The - . probe can detect a 40% TW, ASME hole at the sleeve ! 8 end. !!V 148 !$E A3074 Page 5 9@::EVLU3 TION 0FECPROBESFOR e-- e. 6 'F* /F~ .c.

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THE BABCOCK & WILCOX COMPANY POW 9t GENELADON OROUP nevisions "'"J-

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.e. n 81-6.0 RECOMENDATIONS g,;g =0 8,! Obtain $3j field deployable system can be evaluated. Evaluate the flaw sizing capabilities of the probe at eef expansion transitions using different frequency mixes.

g
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I Evaluate the impact on probe inspection of the sleeve end area due to employing sleeves with different tapering ends.

.8 gi Continue to pursue new technologies as they develop for improvements in ij the inspection of sleeved 0TSG tubing.

i.

7.0 REFERENCES

ga h! 7.1 B&W Drawing No. 1154552, entitled " Baseline Inspection of OTSG j} Sleeved Tubes", dated 11/26/84. e8 Ei 5a:, ) e i-U,r o 9, E!! Ei2 ..? ,!7 8lI BI2 Ik~ !.h i:5

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^ s THE BABCOCK & WILCOX COMPANY POWB CINEATION 0400P mavissoevs "O- '3" '.m .~ 5%* l lE .r M:= er' iji 2". 3.8 i t .l.' Y I'.E I II el II bzi; 1u;. s =;f ci: "i. g~li ..1 El g*ir W ! 8.i i e M.. z I> l z ,iE Est zu I..o Iv !:s r;. tll FIGURE 1 - !!X 55 .f. 1 !.3 > e Page 7 Sw* 9* tas & OLA68 BAM t ., e a _ - wee- - _ _ -mm-seew s m w =emen e. ,.-,,..n r ...nw-

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r l i 1 l 1 m- '. u ai + r e ? 4 i e i t / ~_ ) \\ ae FIGURE 4 - BOBBIN COIL EXAM OF " CLEAN" FIRST EXPANSION TRANSITION . :u : e... u s c.. >r.*E. % - MI/* 1 'ID sE% e CCL* G t t. n.21 . i De*- i .i . osec - . y m _ _. I [ ROTGiTICe= x 8 s y: I op.e ',FFfG - .u --d m-e W .kCTATIQh { i i i f I a I ! RIGHT g 3 l +

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M CE6 46. p0TRTICD-s 3:- %.e,e I h IDTTEM C 3 .m-j i t . e et os 1 i ) 6 L \\ { I i. i, -L FIGURE 5 - BOBBIN COIL EXAM OF 40% TW HOLE IN SLEEVE AT FIRST EXPANSION TRANSITION Page 10 t

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<. - o o 2 to ecom e es ~' s l I T !I I I j W "# ' t 08** ! ? _) Q Q CM - t .fg ~M T T N~ 4 ! i MTATI% l h LEST__i i d I l 4 i DSH8 I M ! I s e FREG - j i. l I T ~ ., sese, - n i I RCTATION s i i { T E M __[ .I 1. i j omne i t T l NQ - .m-I i e.se vu.n n mo e; i %7 73ou i M TM** +e.e I 1 i I' i i r 1 ( tre x i ! s u c m-7 ) I T / je cr cm o i f i + 1 4 N i M / I T .s' .n. FIGURE 6 - BOBBIN COIL EXAM 0F " CLEAN" SECOND EXPANSION TRANS: TION \\ o i 4 :.._ > :. o r,. .>< w r; ~. - n:x : .:n eso. e ca 7 ~ I g e-1 = 7 y

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i , = - i. i ! 4 re er es 'I i l I ,i T. I-t i 4 I + i I ae FIGURE 7 - BOBBIN COIL EXAM OF 40's TW HOLE IN FARENT TUBE AT SECOND EXPANSION TRANSITION Page 11

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1 !ItOTETIC t_ 4 } i I i 1 LE" I i. T-j g i DM i jme- ,s= - ,I T ,EDTATIO I ' d' 'M I l p]p4T I ! i i nee 4 6 g Ns, - i g 7 ! sne4 - 8 6.16 YCLTE 291 DEG e :: 6 ROTATICE I j 8 Ef f. *E% 4.9 i* 6 i lIri_Tc_s j ( 1 T i e im-t - t ? !e or ca ll J 4 \\ o 9 Id 6 <P 1 f i l i ; ta ( } se FIGURE 8 PROBE EXAM OF " CLEAN" EXPANSION l TRANSITION '_ es : mt. _ ce e e..

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W _C- ' VE E '., _ C,9 i VES'.: CM**EL W - stixe 2 (20 0 5ttk B Ca. ]1 '{ f i, j F__ cm.e i __ t- + N i m cme-e =v -- t m __ J j g feOTATIO

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e i ! T. m 4 i l ! I [ I ) F se FIGUP.E 10 PROBE EXAM OF 40% TW HDLE IN SLEEVE AT EXPANSION TRANSITION ) l,_ Cu : Yeti. r> 2 Vert _, Om+C. 60 - MIW 3 lID O R0h e COL l i .W E i .f i _.' ,g;fd- - h pg,e ' CHms - I; t ' sim -- i ? ; q l ROTATION l l 4 _ i g

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1 twm 1 i \\ l spas - i ROTAT10H t 4 4 dL i RIGHT S" me l l CW - iraa - l stw - 1.d5 v0L TL M DEG 40 % _ y' stv.n w +e.e . ROTRTION 1 ( e i m Trn i m _m E l f l e o f 09+- 4 i l l 2

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t t i i j l 4 ~ T 1 ,i ,i l se FIGURE 11 - PROBE EXAM OF 40% TW HOLE IN SLEEVE AT EXPANSION TRANSITION Page 13 1 1 1

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r '" * ** *. ROTATIC l i >Nr 2, x! m._ i P s , e Of & 4 t m I {-{ f -' [.. T + r.- E, i g I i I I 5 d b w j FIGURE 12 . PROBE EXAM 0F 40% TW HOLE IN PARENT TUBE AT EXPANSION TRANSITION

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w 1 L.- me , m _. IRCTATIG l c:ce t i i a jL i i _m cea ,' ms - i m- +.e4 <xi _*. m...s a :(c..e :. y' g' ec7n713 .e \\ I l Im.n et i li m p I d ' "e: - ' D (i ~ i \\ l l T F 4 f l 5 w \\ FIGURE 13 PROBE EXAM OF 40% TW HOLE IN PARENT TUBE AT EXPANSION TRANSITION ~ () Page 14 e

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w.- mix 3E !!D 6 80W 9 CDL SI !!I h. I c=cwn 91 I =s - l l SP584 3 l ROTATION _a u n '. h I f} V FREQ p I sem l l ROTATICH I I I i ! RIGHT ?T $ l; i aem - I I NG i. sm. 4 O.Fi v0LTS 259 DEG 48 '4 i MTATIM - l j ! m!D itM +e. e t i I irmase i m i ) i m - x*,o I i y e e r c>o.- 4 2:47:25 AM a .tcu rsv, i c.a I a i i e r 1 m FIGURE 14 - PROBE EXAM OF 40% TW HOLE IN PARENT TUBE IN FREE SPAN AREA - STANDARD ROTATED FOR MAXIMUM RESPONSE i l 1 i A d l. Page 15 i

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lIr0T;110H O i kE_C a. = Fid; - j f SF+' - g 4 T i -j l ECTI. TION 3 l 1 l 51QHT ST 4 i i a*No - i m; - g (W - ii 6.2* G Ti TL CEG 4 d *. pt,TC. TION x run. ++. e !I i i d,in:P_C9t _r t i s_ \\ ( m-x i ! -MF { l I - i 4 i i 1 .i ,i 1 Tl k 4 I ~... 4 5 l 7 7 \\. f t I FIGURE 16 Page 16

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4&'.. Meet. c - f*Ix'> 3 fl0 6 Rtes O COL j y XY DIS i ones - i os-, I -,I sm. y l l ROTATItm - 4 J 3 t.IFT ST1 e ] ona - I FRES T l sme g f d ROTATIDH - i l + atcur er } own - FREQ t ) 3 SMe4 -- t e

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ROTATION ? t SLv.EMD +e.e l Y l l } lgYSTEMCOWIGtp0 TION l l I b t' j 9 M - X6> l I 6 j i i ! e o< om-4 m 6 lg! l 1 d i 1 .m r.. I f J b t ( 6 b ) ..g m I i i e F 30 ~ FIGURE 21 - L. Page 19

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PROBE EXAf1 0F FLAW M AT 1800 UP FIRST Page 20

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