05000301/LER-1981-002, Forwards Results of Metallographic Insp & Exam of Steam Generator Tube R15C73,as Committed to in LER 81-002/01T-01. Also Forwards Addl Rept on Evaluation of Apr 1981 Eddy Current Insp Results & Eddy Current Insp Maps
| ML20126L451 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 05/27/1981 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | Clark R, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8106030308 | |
| Download: ML20126L451 (69) | |
| Event date: | |
|---|---|
| Report date: | |
| 3012081002R00 - NRC Website | |
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4 C1 ~ WISCONSIN Electnc powen coup >nr 231 W. MICHIGAN, P.O. 80X 2046. MILWAUKEE, WI 53201 May 27, 1931
!T. Unrold R. Denton, Director _
Offico of Nuc1 car Ecactor Raquiation (o ' A
-- '" N U. S. NUCLEAR Pl:CULATORY CCitMISSION F' N Washington, D. c. 20555 . -
, . g Attention: Mr. Robert A. Clark, Chie.
Operating Reactor Branch No. 3 _. JUtl 0 21981 > t-(- u.s, mew uauusa comsson Cent 1 m ns / h, p DOCErT MO. 50-301 "2 'N REPORT OF STL'AM GrNLPr OR TUDE I!;5PECTION POINT SCACH in,CLnAR Y LA !T, UNIT .NO. 2 In our Licensee Event Roport No. 01-002/017-01 we repcrted that a segment of stcan generator tube R15C73 had beon removed from ; the Point Beach Mucicar Plant Unit 2 *A" steam generator for dotsiled natallographic inspection and examination. Attached is a report of ' the results and observations from this inspection. Theso resulta were discussed with Mr. Ez:uitt Hurphy of your Staff on May 22, 1981. ife have also enclosed an additional report on the evalua-tion of the April 1931 eddy curront inspection results. The principal , objective of this report was to dotermine the average growth of the eddy current indications sinco the previous spring 1980 Inspection. Camparisons of reported edcy current results as well as cor.parisons of eddy curront signals were made during this evaluation. This ovaluation i concludos, as we had concluded in our May 11, 1981 report, that there p has been littic or no change in oddy current indicator signals since l 1974, and that corrosion rates over the period from spring 1900 to apring 1901 are not substantially changed from previous years in Unit 2. Finally, as requested by Fr. Murphy, we have enclosed oddy currant inspection staps for both the stoam generator "A" and "3" inlets. I If you have any questions regarding this information, please lot so know. l Very truly yours, k \\ C. W. Fay, Director \ Nuclear Power copartment { Copy to NRC Rosident Inspector Mr. C. F. Riederer (PSCW) i 8106 03 0 Attachment
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EXAMIt1ATION OF POIt1T BEACH UNIT =2 STEAM GENERATOR TUBE SAMPLE SG A R15-073 HL May 18, 1981 l e
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D;cring the April 1981 outage at Point Beach Unit tube sample was rc yled frca steam generator A irict (not leg) side, desi7rm . c Row 15, Coluran 73. The tube showed the presence of an eddy current indicatien of 41 percent wall penetration, prior to removal, at the top of the tubesheet. For extraction of the sample, the tube was cut using a 10 cutting device at a short distance below the first (lowest) tube support plate. The seal weld at the primary f ace of the tubesheet was also removed, thus freeing the tube for extraction. An extraction tooi was inserteo and a load of .11,000 lbs v.a.. ~
. applied. As the sanple was moved from the tubesheet, a fracture occurred that separated the tube into two pieces. Extraction was continued until the entire sample was rt. moved in three pieces; a seccnd ID cut being made to accomodate the sample's length. Figure Al is a schematic of the three pieces of the sample, with dimensional measurements af ter complete remeval.
In the laboratory, additional dimensional measurements were made (Figure A2) and numerical reconr,truction of the tube was madt (Figure B). to locate the ele-vation of the fracture that occurred during extraction. From the dimensional measurements, the tube had been stretched in length approximately 10 inches, based on an original cut length of 68.5 inches, compared to a final lengtn of
- 78.125 inches, Fron outside diameter measurements, most of the stretch occurred in pieces 2 and 3.
As given in Figure B, the fracture location is judged to be at 0.5 inches above the top of the tubesheet. A Radiography of each piece was performed as a guide to metalicgraphy. number of indications were found due to ID scoring from the tube cutting and ' tube extraction tooling. One of tnese indications at s7-1/2 inches above the tubesheet, was examined by metallographic techniques and confinned to be a tool mark on the tube 10.
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to the fractured ends. Metallographic and Mcroscooic Exa-inatiens Tre The fractured a' ids were photcgrached at 4 views each (90 acart' . 1 fracture surf ace at the upper end of Secticn 1 (tr.e first section to te recove: was then examined b) scanning electron microscope (SEM) fractograpny and selected-area energ;>-dispersive X-ray spectral analyses (EDAX). Axial cross sections upward and downward from both fracture faces were then examined by optical metallography. The 00 surf ace immediatel;' below the fracture at the area of maximum apparent wall thickness reduction (which also contained tne ceepest intergrar.uii.r penetrations) ..as catnocica.ly descaled (in 5. H2 S^4 '""'
"Rodine" inhibitor) and examined by the SEM. An additional axial cross section through this zone was then prepared.
Additional metallogreric samples included two transverse sections within the tubesheet regio 1, one located 1-1/2 in, below the fracture and a second located 11 in, above the lowest end of the as-rec 3ived Section 1. The remaini19 metallographic sample was an axial cross-section above the top of the tubesheet, 6-3/4 to 7-3/4 in, above the fracture edge. All examinatio1s and sample locations are sy1opsized in Figure 1. i Figure 2 shows the as-received appearance of the 1-1/2 in, of tubing whic.1 extended from the f*acture downward. The sectioning in this region and photo-micrographs of the fracture edge appear in Figures 3-5 for axial planes located at 90* and 270*. (The zero degree orientation reported.y faced the divider plate.) The third plane, located at about 210* (and prepared after descaling and SEM examination) is shown in Figures 6-8. The deepest penetrations by intergranular attack (IGA) at the fracture edge l were noted in the 270* micro (Figure 3) at 0.016 in., and in the 210* micro (Figure 7) as 0.010-0.012 in. The " necking" at the fracture requires these l l l
-_ _ .___ , . _ _ . . _ _ . . _ . _ . _ . . _ - _ _ . , . _ . _ _ . _ _ . _ . ~ . _ . _ _ . . _ . _ - _ . _
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n obsery;ticc:,, rarticularly at .110~, t0' n es:P a:es, since-: e origirt'. O edges'may- have been distorted due to the elengation. Essentially, no !GA was observed on the fracture edae at 90' (Figure 5). The axial extent of IGA bele . the fractur'e,'as shcwn by Figures 4, 5, 7, and 8, was about 0.10-0.15 in. ' (for any IGA of 02 .C1 in.). ' i ( The' zone extending upward from.the fracture is shown in the photographs and The results, for the 90* and 2703 edges, photomicrograpnicaliy of Figures 9-12. are, of course, the same as preceeding at the fratture edge. The axial extent of IGA upward was greater at' 270* (0.83 in.) than at 90' (0.4 in.) see Figure 10.
'The deepest IGA-(on the 270 edge, Figure 11), was about 0.016 in.
The SEM fractographs of the upper end of Section 1 (taken prior' to the axial sectioning above) are collected in Figures '3-18. Examinations were made Zone.i 0* and at 45' intervals (with 2 added increment's between 225' and 270*).
.of IGA existed in the fractographs at 135' to 270', with maximum apparent depths of IGA at 180* to 250*. Shear zones were present at all' locations; the fracture faces at 0", 45*, 90', and 315* were predominantly-to-exclusively shear.
The fractional depths of IGA in the fractographs is not useful in determining the fractional pene: ration by IGA prior to-tube ramoval because the shear zones are narrower than the original ligament of unaffe:ted base metal, owing to the
" necking down" by e'!ongation.
The absolute depths of IGA, inferable from t1e fractrographs, are subject to the magnification distortions arising from the sample tilt on the SEM stage. (The 6 to 8 mils of apparent IGA shown in the 270' fractograph does not compara well with approx.16 mils found metallographically, whereas the 13 mils that appear in the 235-250* fractographs closely agrees with the metallography.) To investigate the possibility of pre-existing OD thinning at the fracture zone, the downward-extending axial . micro was descaled and examined with the SEM on the 0-180*-270 side. The observations appear in Figure 19-22 and are supportive of both mechanical elongation and chemical (etching" or attack _ . _ . _ , , _ _ . _ . _ _ . . _ _ . , - _ _ . _ , . . . _ . . _ . . . _ . - ~ , _ . _ _ _ _ . _ . _ _ . ~ . - . . . _ . . _ .
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grinding), suggests che:nical thinning. WhenLthis observation is^ coupled w'ith the appearance of the axial sections at 270 and 210', it appears that a thinning phenomenon had been present at the fracture zene. The condition af the tube within the tutashe it is sho'.sn in the photca ice:- graphs of the 2 traisverse cross-sections in Figures 23-26. At 11 in, above tne bottom end, a singli penetration of 0.009 in, existed; this was the deepest - found (Figure 23). At 1-1/2 in, below the fractu e, some extremely shallow (0.6 mil deep) grail boundary penetrations existed (Figure 26). Ito IGA or otne degracations existec in a zole 6-3/4 to 7-3/4 in, above aie fracture, above the top of the tubesheet. Tigures 27 and 28 present these obsar-vati ons . The EDAX analyses of materials on the fracture face that was studed by SEM appear in Figure 30-36. Typical elements (Na, Al, Si, S, C1, K and Ca) were observed. Sumnary of Observations
- 1. The tube sample fractured at about 0.5 inches above the top of the tube-sheet due to e< traction Icads.
- 2. Intergranular attack was noted in a reiatively narrow axial zone part way around the tubi outside perimeter.
- 3. .The maximum depth of penetration by IGA is estimated to be 0.016 inches (approx. 32% of original wall thickness). In-situ eddy current testing estimated 41 percent wall penetration.
- 4. Some localized tube wall 00 thinning was suggested by the metallographic results. The aeptn of thinning could not be determined owing to the elongation of the tube wall at the point of fracture.
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- b. Une t: n:. "--
- . . n ; ' , : , . ., .: ., t. n t e- . - c. . . c ;.. i (approx. mid we.y in tubesheet crevice) showed a single penetration from the 00 surface of about 15 percent wall thickness. l
- 6. No significant ICA <.as ctserved on the tube !y metallc;r:pPy a abe..t ,
1 one inch below tne top surface of the tuoesheet uithin tne crevice. ! i J I i i t l
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1 0.771 m, w w 0.753 , w average 0D for all three pieces = 0.818" 0.763 0.785 0.804 0.809 s. 0.811 N w W 0.813' w I M c. l
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- 2. Assume no wa d tninnirg 2 ,y then V O^ L 0 'O = Df f f
- 3. Original length of piece 1 : L O -
00 = 0.875" L6 = 23.0" L = 23.0 - 1.875 = 11.125" f D = 0.862" 1 avit r age
- 4. L- =0 f Lf 2
= .(0. 862..)2. 21. _12.5 = 21.5 oe ffective 2 (0.875)2 D
0 L * + 1.875 = 22.375 l O 0 effective Location of tracture above bottom of tucesheet : LO+ or 0.5" above nominal top of tubesheet Check of Wall Thinning Assumption
- 1. Measured average 00 of entire cut tube = 0.818" 2 1/* 2 1/2 Calculated average 00 = 00 'O $* 551- $b E = 0.816"
----- =
L 76.25 f . where: L = 68.125" - 1.875" = 66.25" , 0 effective L = 78.125" - 1.875" - 76.25" f This i s eveellent acreement assumino no wall thickness change. shows no significant wall thickness reducticn at 11 inches l
- 2. Met al t ogr atihy l
-above bottom of Piece 1.
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jy: a WIS A (15-73) HL: Microscopic Examinations f Figure 1 Figure 2 A(15-73. , Upper End of Section 1, at rracture. 4 kotations . (0",90,,ctc.)- Figure 3 A(15-73:, Section 1, Double Axial Cross Section (90' and 2703) through Fracture. Depth of IGA Measures 0.016 in. (to Center of Field "AA") on tne 2703 Side. Figure 4 A(15-73), Continuation of Axial Metal'ography, on 270* Side, Section 1, Figure 3 Figure 5 A(15-73 , Continuaticn of Axial Metal
- ography, Sectir ' ,
Figure 3 Figure 6 A(15-73) . Upper End of Section 1, Broken Out of Mount, Descaled, and Renovated as an Axial Section at aoprox. 210' Figure 7 A(15-73), Section 1, Axial Cross Secti)n Through Fracture, approx. 210* Orientation. Depth of IGA Measures 0.010-0.012 in. (Measureuent is Complicated by Necking Down of Tube at Fracture) Figure 8 A(15-73), Continuation of Axial Metallagraphy of Figure 7 Figure 9 A(15-73) , Lower End of Section 2, at Fracture. 0* , 90*, etc. Figure 10 A(15-73), Section 2, Double Axial Cross Section (90* and 270*) through 3racture. "X's" Mark Upward E(tent of Microscopic IGA Figure 11 A(15-73), Section 2, Axial Metallography, Areas A and B of Figure 1) Figure 12 A(15-73), Continuation of Axial Metall3 graphy of Figures 10 & 11 Figure 13 A(15-73), SEM Fractographs at Upper End of Piece 1, at 0* and 45*. OD Edges are at top. Both Areas Appear to be Shear Only Figure 14 A(15-73), SEM Fractographs at 90* and 135*. Shear Predominates at 90 ; approx. 1/3 of Fracture at 135* is apparent IGA. (00 edges are at top) l- Figure 15 A(15-73), SEM Fractographs at 180* and 225*. At 180*, the IGA zone is approx. 3/4 of the fracture, and at 225 , IGA is about-t 2/3 of the fracture. Figure 16 A(15-73), SEM Fractographs at 235 and 250*. The zones of IGA I appear to be approx.1/2 of fracture in both areas. Figure 17 A(15-73), SEM Fractographs at 270*. IGA appears to be 1/4 of the fracture face. 1, -, . . , . . . , - - . , . , . - , . . , , - - - . . -..-, ., -
- 3
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-Figure 19 A(15-73), Double Axial Micro at Top Of Secti0t 1, sh:'.m originally.in Figure 3 (180' side). Electrolytically Descaled and Examined on OD by SEM at Areas A-G. (Lower 2 pictures are SEM's)
Figure 20 ' A(15-73. , SEW s of Descaled CD surfaces at 4reas G.and C of Figure 19 i Figure 21 A(15-73), SEM's of Descaled OD surfaces at Areas 0 and E of Figure ".9 Figure 22 0 A(15-73), SEM's of Descaled ODfsurfaces of Aeas F and G of ,, Figure '9 Figure 23 A(15-73;,11 in, above bottom end of Fection 1, Transverse Cross Section. Deptn of ;GA in ic.'er. pnotor.icrcgraph measures 0.CC9 ir. Figure 24 A(15-73 ' , 11 Lin abcve bottom. Areas B cnd C of Figure 23. Figure'25 A(15-73),1-1/2 in. Oclow Fracture. "ransverse Cross _Section. Figure 26 A(15-73. , 1-1/2 in. below Fracture Areas B and C of Figure 25. The OD conditions at B represents intergranular penetrations of about 1 grain in depth (Approx. 0.006 in. or 0.6 mil) < Figure 27 A(15-731, Double Axial Cross Section,1 in. long, centered at
- 7-1/4 in. above the fracture. '"Chattar marks" from tube removal i equipment were present on ID surface.
Figure 28 A(15-73 i,- Axial Cross Section 6-3/4 t) 7-3/4 in. above fracture. Areas A-D of Figure 29. Figure 29 A(15-73), Fracture Surface of Section I, showing materials analyze 1 Dy EDAX at Degree Orientations Indicated Figure 30 A(15-73), EDAX at 45', Figure 29 l Figure 31 A(15-73), EDAX at 90', Figure 29 Figure 32 A(15-73), EDAX at 135*, Figure 29 Figure 33 A(15-73), EDAX at 180*, Figure 29 Figure 34 A(15-73), EDAX at 225', Figure 29 Figure 35 A(15-73), EDAX at 270*, Figure 29 Figure 36- A(15-73), EDAX at 315 , Figure 29 l i L
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a l - POINijlj.AGI UNIT 2 (WIS) ANALYSIS OF APRIL. 1981 EDDY CURRENT TNSPECFIGN RESULTS INTRODUCTION An evaluation of the April, 1981 eddy current inspection results,was made at the request of Wisconsin Electric Power Company. The principal objective of the evaluation was to detennine the average growth of the reported eddy current indications (ECI's) since the previous May,1980 inspection. Com-parisons of the EC1 growth, data as well as photogranhs of the eddy current
, .ignals were also made in the. evaluation.
DISPLAY OF EDDY CURRENT INDICATIONS REPORTEl) AT APRIL,1981 ]NSPECTION Figures 1 and 2 are histograms of the numbers of inlet side indications arranged according to the reported percent wall penetration, steam generators A and B, respectively (Note that the vertical scale of Figure 1 is twice that of Figure 2). Inspection of the histograms show3 that the maiority of the in-dications are observed at the lowest range of wall penetration (20-29t,) with successively smalier numbers reported at the higher percentages of penetration. This type of behavior is typical of the thinning phenomenon, as shown in a number of previous evaluations of inspect ion data f rom other uni ts. CmPARISON OF GROWN Of EDDY C@R)E INDCIATIONS IN SUCCESSTVE INSPECTION INTER A statistical evaluaticn of the change in reported tubesheet eddy current in-dications (ECI) beween successive inspections from 1974 to 1981 was made for the inlet data from each of the two Point Beach Unit 2 steam generators. Only those tubes for which ECI's of 20*. or greater in each of the pair of inspections compared were used in the data base. The results of the calculations are summar-ized for each of the steam generators in Tables 1 a'nd 2 respectively, 'and are grarAically displayed in the fonn of histograms for each steam generator in Figures 3 and 4 respectively for the 1980-1981 period. Ficure 3 for Steam Gen-erator A shows rather well behaved data, clustered about the o to s'. growth range in a generally bell-shaped curve. In the case of Steam Generator B inlet. Fiv. 4, the same general trends are observed, although the data are not as continuous as those of Fig. 3, presumably due to the considerably smaller data base. TABLE 1 POINT BEAW UNIT 2 (WIS) STF#1 GENERATOR A (INLET) Growth of Eddy current Indications 2 20% in Successive Inspection Intervals INSPECTION NUMBER OF 'IUBES CALCULATED AVERAGE STANDARD DEVIATION INTERVAL CPDARED CROWIll IN HCI (t) , 10/74 - 3/76 21 1.8 6.3
-0.3 3.0 3/76 - 3/77 24 4.4 3/77 - 3/78 19 -2.4
-0.9 3.1 3/78 - 3/79 8 7.1 3/79 - 3/80 4 10.5 5.5 6.5 3/80 - 4/81 164
._ _ . - .~. __ _ _ - . _ _ .
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. j Point' Beach #2 E.C. Insp.Results 2- May 18, 1981 April, 1981 TABLE 2 POIMF BEAW UNIT 2 (WIS)
STEAM GENERATOR B (INLET) Grouth of Eddy Current Indications 220i, in Successive Inspection Intervals INSPECTION NUMBER OF TUBES CALCULATED AVERAGE STANDARD DEVIATION f, INTERVAL COtPARED GROKIH IN ECI (%)
-8 0 10/74 - 8/75 2
'O 8/75 - 3/76 2 8 3/76 - 3/77 5 -1.4 4.0 3/77 - 3/78 8 2.6 2.3 3/78 - 3/79 5 -4.2 3.8 3/79 - 3/80 4 2.5 7.1 3/80 - 4/81 22 4.9 7.9 For Steam Generator A (inlet), the unit in 'which a sufficient data base is present,the data over the seven year period indicate 1itt1e change in ECI's.
In the emparison between the March,1979 and March,1980 inspections , a 10.51, average change was calculated, llowever, this can be disregarded since only four tubes could be compared (i .e, only four tubes exhibited ECL 's of ?201, in both inspections). For the March,1980 to Apri1,1981 interval, an average ECI growth of 5.51, was determined for a calculated growth rate of 0.48%/EFPM over the latest inspection intervals of 11.5 EFpM. For Steam Generator B (inlet) the data base is generally too small to pennit any conclusions to be drawn from the calculations for the inspection intervals up to March,1980. For the l March,1980 to April,1981 inspection interval, an average ECI growth of 4.9', was detemined for a calculated growth rate ,of 0.43*,/EFBI over the latest in-spection interval of 11.5 EFPt. A Westinghouse re-evaluation of the March, 1980 data from SG-A compared to re-ported values in April, 1981, was.made on a sample of 68 inlet tubes from the data tapes. Sane differences were noted for the March,1980 data. On the basis of the Westinghouse estimates, an apparent growth of 3.4% was calculated for the 68 tube sample for the March,1980-April,1981 operating period. This cmpares with the higher estimate of 5.51, quoted above. PHOTOGRAPHIC C0fPARISON OF CURRENT AND PRIOR EDDY CURREVT SIGNALS A cmparison of the April,1981 eddy current signals from a sample of ten tubes, selected frm the central region of Steam Generator A inlet , was made with the corresponding signals recorded for those tubes in previous in-L spections. The tubes capared were selected on the basis of location in the l region of greatest reported activity, reported wall penetration of 20% or greater, and consecutive inspection history traceable as far nack in time as possible. Except for a few cases where a selected tube was not inspected in March,1979, eddy current signals were retrieved from tape storage for each tube from the March,1980, March, l979, March,1978, March,1977, March,1976, and October, 1974 inspections. The photographs of the eddy current signal CRT di. splays for each of the ten steam generator tubes selected are shown in the Appendix to this report. In l I (. - -,
, , - , - , . - - , , .n, -. - - . . , , - - . . - - - . . - - . . . . - - - . . . - . . .-
Point Beach #2 E.C. Insp.Results May 18, 1981 April, 1981 the April,1981 and March,1980 inspections, multifrequency (400 kH: and 100 kH: singly and mixed, in the differential mode) data were obtained, as labeled on each figure. The 400 kil: tubesheet signal is shown at the upper left, the 100 kH: signal is displayed at the upper right, and the mixed signal appears at the lower center of the photographs frm these inspections. In the other inspections noted, only single frequency, 400 kli: data were obtained.
'Ihe percent wall penetration data as reported by Zetec are included on the CRT photographs for reference purposes. In sane cases, either no evaluation was reported (left blank on photo), or distorted tubesheet signals (UrS) were noted.
It is evident from a visual-comparison of the photographs that the 400 kil: sig-nals have the same general shape in successive inspections from October,1974 to April,1981 for each of the ten tubes examined. Since it was concluded in October, 1974 that the indications reported were due to tube wall thinning, the photo c6mparisons suggest that the April, 1981 Indications can also be attributed to the same phenomenon, or alternatively that the intergranular attack (ICA) observed in the pulled tube (R15C73 HL) has not contributed in a significant manner to the observed eddy current signals. at the top of the tubesheet. As for the 10 tubes cmpared, the 1980 and 1981 signals for R15C73 a.ls'o show no notable differences, (See Figure 5). SUhMiRY AND CONCLUSIONS Evaluation of the April, 1981 eddy current inspection data suggests no more than a small increase in penetration for the affected inlet tubing of Steam Generators A and B, as indicated by the data of Tables 1 and 2. On the basis of the re-ported data, the growth rates over the operating interval between the March,1980 and April,1981 inspection are calculated as 0.481,/EFPM for Steam Generator A, and 0.431,/EFPM for Steam Generator B. Comparisons of these rates with those of the previous inspection intervals cannot be made with any degree of certainty due to small data base for the previous intervals. However, photocomparison of eddy current signals fran selected tubes generally shows little or no change in signals since October, 1974. In addition, Westinghouse believes that the cal-( j culated rates based on the Zetec data are too high by up to about 21,, so that the above corrosion rates are probably lower. In view of these observations, Westinghouse believes that the corrosion rate indicated for the 3/80-4/81 period ( is not substantially changed from that of previous years for this unit. Indeed i it is not clear that the total data assemblage for the top of the tubesheet region supports any detectable progression over the 1974-1981 period. l l l l l l i
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... .[ .GNANGEl .l14 SIZE. Of INDeC AT8#N C% WALL PEks. I l f
[ l : f T ; l l 57g/W
] [ l ,
FIGURE 5 POINT BEAOi UNIT 2 (WIS) STtAM GENERATUR A-INLET EDDY CURRENT SIGNALS ~ R15C73 , (Pulled 4/81) 3/80 ,- 100 kH7,
,,,400 kHz ..
f. e
. x- ..: ., -
4 _ g y YY'Q! s e_Ml ' n
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l 400 - 100 MIX l 1
f APPENDIX Photographic Cmparison of Eddy Current Signals
' From Successive Inspection.S for a, Selection of Steam Generator Tubes. Point Beach Unit 2, Steam
- Generator A - Inlet.
( ( l l 1 l l
0 .' I4)lNI 111 Atli IINIT ' (W l'.) Sil.AM i.) NI:RATIM A IN1.1 i R.'m21
'I$0 4l1) 42 Km 100 W foo Wz 100.kHs.
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ff$ ,cNN v '< .. ..&g2%fh?C:'",..
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.f > ~< m. M ey w ;4495> c M ?. .
400 - 100 HI)( 4co goe yy 49 /o e 2 o */o W& 3h9 317t ;
$17 . - - . .
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DTS 5/76 to/M s DTS
..... _. _.- - _ _ - - ~ _ . _ _ . . . _ _ _ _ . _ . _ . _ _ . _ . - _ _
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; ; Sil:AM tJ NI;RAIUR A INl.1.T EIN _ . . _ 4 4pl 3/.k l I"}%
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. I, SITAM t;liN!!RA' LOR A INI.IT l
R19244 ._, 4pg Mb
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. 2 1 */s go.4
IUI NI' Ill!At ll IJN IT .' ( W I .C. ) l ; Sil AM CJiN!!RAlUR A INI.lil' f 2196 8 3/a 4/s fo0_tS;t . _.._f_00_)[l/2; _ f00 IINE , . . . _ . _ _ . _ . . . l.M_D M .W i- . . . ~g e _, . - 2 .- -
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'400 100 MI^ .H in 100 MIX 34 %
36 % __ 400 k 3 h9 _ _ _ , _ _ 3M ,
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~= gg,g 1NSPECTtO '.
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+
n ! v .. A I - __ n=+ .4 gNL* _. [., a l 4 9,0 *4 l 3/16 Jo//f 1 4 20 % < Ao % ~ - - _ . . . . _ ~ . .
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400 itHi Mi A 100 100 mix l 39*/o 3 + */o l f 00 i$x-3N9 3M $1 21 % %6% 27 %
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34 % 23 %
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IN SPECT ED h,} b ' 4 DTS
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l I PolMI IllWII INIT / (WI.'l STliAM t3;.Nt!RA' LOR A IN1El'
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