ML20141D940
| ML20141D940 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/16/1997 |
| From: | Hacker K, Hacker M FRAMATOME |
| To: | |
| Shared Package | |
| ML20141D931 | List: |
| References | |
| 51-1269912, 51-1269912-00, NUDOCS 9705200243 | |
| Download: ML20141D940 (13) | |
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SUMMARY
DOCUMENT FOR PRESSURIZER NDE 01 as DEVELOPMENT 1 kh '
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FTl Document No. 51-1269912-00 si 1:
et Prepared by: b M/8// Date: Y N77 lI eI W G. Hacker, Ledl Ill 4
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April 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 ,
Development Page 1 of 8
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Background
During the CR-3, Refuel 9, outage an ultrasonic examination of the pressurizer surge nozzle-to-lower-head weld detected an indication that exceeded the IWB-3500 acceptance
(- standards of ASME Section XI Code. This examination was performed using the required d
jg ultrasonic examination requirements of ASME Section XI and Section V, Article 4,1983 if Edition through the Summer 1983 Addenda. The indication is characterized as a subsurface flaw centered at a depth of 1.5" (curvature corrected depth) from the OD 83 lj surface. It is most likely that this is a slag inclusion left from the welding process during vessel manufacturing. Because this weld joint is a nozzle-to-head weld, scanning for this sy i y indication is limited to scanning in a radial direction toward the nozzle from the pressurizer head. A fracture mechanics analysis of the Refuel 9 ultrasonic examination results was 8g performed and found the flaw to be t.,ceptable. What follows is a discussion of the 5j development of a focused beam tran-sducer, the demonstration which quantified the lhl focusing effect of the transducer, and the results of the reexamination of this weld during
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M Refuel 10.
fii if FocusedJIanadner Develonment In recogr.ition that the flaw size measured in accordance with ASME Section V, Article 4
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se requirements is exaggerated due to the effects of beam spread, FPC contracted
$) Framatome Technologies Inc. (FTI) to evaluate the use of a focused transducer for use ij during the next outage to more accurately characterize the indication. The transducer used during the Refuel 9 outage was a conventional 2.25MHz,0.5"x1.0",60* shear wave. This p;
d is a standard flat piezoelectric element that emits a divergent beam. See Figure 1 for an j
- 5 illustration. By contrast, a focused beam transducer results in a convergent beam as l[ shown in Figure 2.
' lI ey When the flaw size is smaller than the beam width, the amplitude-based, Article 4, requirements for through-wall sizing of flaws results in an integrated measurement that )
j{s includes the actual flaw size and the beam width of the transducer. These effects are l<
q greatly exaggerated as the beam spread increases. Therefore, it is desirable to minimize h the beam spread when making these measurements. A focused transducer eliminates the N beam spread by converging the energy at the focal point.
n Q Figure 3 illustrates the effect of the beam spread when measuring the through-wall
- 3) dimension of a flaw at a fixed depth from the surface. Referring to Figure 3, when the h leading edge of the beam (@ 50% DAC) intercepts the flaw, the sound path is at the il maximum dimension. The peak amplitude is obtained when the center of the beam is centered on the flaw. As the beam is moved forward until the trailing edge of the beam P
(@50% DAC) intercepts the flaw, the sound path is at the minimum dimension. Using the Article 4 requirements for through-wall measurements, the corresponding depths at the upper and lower edges of the beam relate to the through-wall extent of the flaw. This April 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 Development Page 2 of 8
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results in an exaggerated size due to the change in the effective beam angle at these edges of the beam. This effect is eliminated with a focused beam transducer.
6 FPC decided to use a nominal 5.0 MHZ center frequency for the focused transducer in l order to enhance the focusing effect of the transducer and to provide for increased ;
ilg resolution. Because the pressurizer head is carbon steel, frequencies as high as 5.0 MHZ ,
jg can be used without problems from attenuation. The transducer design kept the nominal sj beam angle to 60* and used the shear wave mode to be consistent with the transducer used for the initial examination during Refuel 9. The focused transducer achieves focusing 13
$9 through a curved lens internal to the housing thereby enabling it to be used in a contact -
ja' mode for manua, scanning on the pressurizer head. An evaluation of the focused transducer is described in the following paragraphs.
g d Focusedlrdnaducer Demonstration F
fE in order to quantify the effectiveness of the focused transducer, a calibration block,5" y thick containing the required 0.25" dia.,1/4T,1/2T, and 3/4T side drilled holes was used jg to compare calibration curves and beam spread. Both the conventional, 2.25MHz,0.5" d
jg x 1.0", single element,60* shear wave transducer (same type as used for the Refuel 9 outage) and the 5.0 MHZ,0.85" x 0.85", dual element,60* shear wave focused transducer
!g were used for the comparison. The calibrations were established by maximizing the jg response from each of the holes in the calibration block. The beam spread measurements were performed in accordance with the ASME Section V, Article 4 requirements. The gg p
g Article 4 beam spread measurement process involves moving the transducer forward until the signal amplitude from the calibration hole reduces to 50% DAC and then moving the is transducer backward away from the hole until the signal reduces to 50% DAC. At each of
"{ the positions the depth of the signal is recorded. The values listed in the table below are lj the measured differences between these positions for each hole.
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Apnl 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 Development Page 3 of 8 I
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The following table and graph shows the results of the comparisons.
Transducer Hole Dia. Hole Depth Amplitude Beam Spread
- @50% DAC 8
. 2 Conventional .25" 1/4T: 1.25" 80% .375" H .5" x 1.0"
.500" 2.25 MHZ 1/2T: 2.50" 44 %
$1 S 3/4T: 3.75" 26% .750" 2d
$p Focused .25" 1/4T: 1.25" 80% .187" gg .85" x .85" am 5.0 MHZ 1/2T: 2.50" 44 % .312" iE 3/4T: 3.75" 19% .625" ga 5k h
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Based on the measurements listed above, an approximate 50% reduction in beam spread was achieved at the focal depth of the focused transducer. The results are presented in y' the following graph titled " Beam Spread Comparisons". The graph plots the beam spread
- jlt of each transducer as a function of depth. Linear interpolation was used to calculate the intermediate beam spread values between the 1/4T,1/2T, and 3/4T holes. The depth of the indication in the pressurizer surge nozzle-to-head weld (1.6") is also indicated to show jg the difference in the beam spread at that depth.
5, 11 The process of performing the beam spread measurements is essentially the same as gg a! used for recording the through-wall dimension of flaws in accordance with the ASME, h
g Section V, Article 4 requirements. That is, for indications with maximum amplitudes of up to 100% DAC, the transducer is moved forward until the signal reduces to 50% DAC and jr back away from the indication until the signal reduces to 50% DAC. The minimum and maximum depths are recorded at each of these transducer locations respectively. For p
,j indications where the maximum amplitude is greater than 100% DAC the same process is used except the minimum and maximum depths are measured at limits of one-half I
g{s maximum signal amplitude (HMA).
!! Based on the following graph, application of the focused transducer is expected to provide H the most accurate estimate of flaw size. Consider that, if using the Article 4 flaw sizing rj procedure, the 0.25" diameter calibration hole would be measured at approximately 0.21" through-wall with the focused transducer and at approximately 0.41" through-wall with the ;
h]! conventional transducer. In this case, the focused transducer has a measured error of l I
h approximately -0.040" and the conventional transducer has a measured error of ll p
approximately +0.160". The data indicates that the focused transducer provides the most accurate measurement.
l April 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 Development Page 4 of 8 l
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Imolementation of the Focused Transducer at Refuel 10 j During the Refuel 10 outage the indication in the pressurizer surge nozzle-to-head weld Il was reexamined using the same type of transducer as used for the Refuel 9 outage that l detected the flaw. This was a 2.25MHz,0.5" x 1.0", single element,60* shear wave ei transducer. The focused transducer ( 5.0 MHZ,0.85" x 0.85", dual element,60* shear jj wave) was also applied. All calibrations were made using the ASME code calibration block #40709 identified for this examination. The same examination procedure was used j
ij for both transducers and is in accordance with the Section V, Article 4, requirements for jg examination and recording. The Level ll examiner perforrning the examination during Refuel 10 was the same examiner that performed the focused transducer development and 8g qualification work. The following table summarizes the results of the examination. More h
p detailed information can be found on the data sheets from f.he examination, Refuel 10 Examination Results April 16,1997 Summary Document for Pressunzer NDE Doc No. 51-1259912-00 Development Page 5 of 8 J
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Transducer Maximum Depth @ Through-wall Length Amplitude Max. Amp. Dimension * ;
Conventional 90% DAC 1.6" 0.36" 0.8" j .5" x 1.0" J 2.25 MHZ si 125% DAC 1.6" 0.18" 0.7*
jg Focused
,g .85" x .85"
-2 5.0 MHZ
- These values have been adjusted to account for the convex curvature of the head.
%s h The results are in good agreement with the expected measurements based on the demonstrated reduction in beam spread using the focused transducer. As mentioned yT; H previously, the focused transducer results in an approximate 50% reduction in beam y
y, spread at the depth of the indication. Additionally, the focused transducer has been shown to provide the most accurate estimate of flaw size. Considering that the reported p indication is believed to be a slag inclusion, the 0.18" measured through-wall size is more credible because the slag inclusion would most likely be limited to the thickness of one fl b weld bead. This is consistent with the through-wall measurement obtained with the focused transducer.
5* In summary, the measurements obtained with the focused transducer are in accordance
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! with the ASME Section V, Article 4 requirements. These measurements are considered N to represent the best estimate of flaw size and result in an acceptable flaw size based on M the ASME Section XI, IWB-3500 acceptance standards. The data acquired in Refuel 9 for this indication are considered to be very conservative. Through the understanding of ll 4 stresses, material properties, and geometry acting on the body, a linear elastic fracture kh mechanics analysis using the data from the focused transducer recorded during Refuel 10 was performed in accordance with Section XI of the ASME Code. The flaw indication has
"! been found to be acceptable by the ASME Code,Section XI, IWB-3612 criteria for Eii continued safe operation through end-of life. :
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April 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 Development Page 6 of 8 l
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1 Illustration of Beam Shape for Non-Focused Transducers
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lilustration of Beam Shape for Focused Transducers Figure 2 April 16,1997 Summary Document for Pressurizer NDE Doc No. 51-1269912-00 Development Page 7 of 8
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l April 16,1997 Summary Document for Pressurizer NDE Joe No. 51-1269912-00 J Development Page 8 of 8 l
3F0597-04 20497A-5 (1/96)
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CERTIFICATION OF QUALIFICATION F RAM ATO M E 75CHNOLOOIEs N::me: Touhalisky, J. S.S.No.: 159-30-5180 The mduidual desenbed above has been qual (ied in accordance with the applicable Framatome Technologies Personnel Qualdication Procedures and is certfied to perform the nondestructive exartisnations listed below.
LIQUID PENETRANT (ITEM A) MAGNETIC PARTICLE (ITEM B) ULTRASONIC (ITEM C) EDDY CURRENT (ITEM D)
LEVELI (TRAINEE) LEVELi (TRAINEE) LEVELl (TRAINEE) LEVEL 1 (TRAINEE)
GENERAL 83.7 GENERAL 90.3 GENERAL GENERAL SPECIFIC 80.0 SPECIFIC 85 4 SPECIFIC SPECIFIC PRACTICAL 95 4 PRACTICAL 95.0 PRACTICAL PRACTICAL AVERAGE 89 1 /. 90 2 /, AVERAGE
,f . AVERAGE / AVERAGE LEVEL 111 hu/c'M' LEVEL lil M4'N LEVEL 111 LEVEL lil CERT.DATE 3/11/94 CERT. DATE 3/11/94 CERT.DATE CERT.DATE EXP.DATE 3/10/97 EXP.DATE 3/10/97 EXP.DATE ,, EXP.DATE LEVEL 1 LEVELI LEVELl LEVEL 1 GENERAL GENERAL GENERAL GENERAL SPECIFIC SPECIFIC SPECIFIC SPECIFIC PRACTICAL PRACTICAL PRACTICAL PRACTICAL AVERAGE AVERAGE AVERAGE AVERAGE
- CVEL !!! LEVEL lil LEVEL lli LEVEL lit IT.DATE CERT. DATE CERT.DATE CERT.DATE 2.DATE EXP.DATE EXP.DATE EXP.DATE LEVEL!! LEVEL ll LEVEL 11 LEVEL ll GENERAL GENERAL GENERAL 89 2 GENERAL SPECIFIC SPECIFIC SPECIFIC 85 SPECIFIC PRACTICAL PRACTICAL PRACTICAL 85 PRACTICAL AVERAGE AVERAGE AVERAGE / 86_4 / AVERAGE LEVEL lil LEVEL lli LEVEL !!! ML wW7 LEVEL 111 CERT DATE CERT. DATE CERT. DATE '1/t1/95 CERT. DATE EXP.DATE EXP.DATE EXP.DATE 1/10/98 EXP.DATE LEVEL !!! LEVEL lit LEVEL lli LEVEL lli BASIC BASIC BASIC BASIC METHOD METHOD METHOD METHOD SPECIFIC SPECIFIC SPECIFIC SPECIFIC PRACTICAL PRACTICAL PRACTICAL _ _ _
PRACTICAL 1 AVERAGE AVERAGE AVERAGE AVERAGE l LEVELlil LEVEL 111 LEVELlit LEVEL 111 CERT. DATE CERT.DATE CERT.DATE CERT.DATE EXP.DATE EXP.DATE EXP.DATE EXP.DATE j 8WNS Personnel Qualification Procedures (ITEM J) OTHER: I f PT: ISI-22 ET:
ISI-20 UT: ISI-21 h 4: VT:
l Page 1 of 5 l
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FRAMATOME CERTIFICATION OF QUALIFICATION N TsCHMOLOSSss
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NAME Touhalisky, John S.S. NO.: 159-30-5180 h PREVIOUS NDE EXPERIENCE / CERTIFICATIONS:(ITEM L) esosienenous DATEEwtST) COMPANY NDE CERT. DATE DATE LENGTH OF METHOD LEWL CERTIFtED CERTIFICATION START STOP 9t14/92 Present BWNS, Lynchburg, VA UT 11 3/26/93 On going 7/28/58 11/91 TRW(Nuc. Div.) / Akfoa Textron UT 111 10/19/88 3 Years 25-1500 #2965 lOE TRAINING:(ITEM M)
DATE NDE HOURS COURSE DESCRIPTION METHOD CONDUCTED BY (COMPANY)
START STOP 548 5/68 UT 40 Ultrasonic insp. Level 1 ASNT Chapter. Cleveland. OH 647 647 UT 80 Ultrasonic Testing & Measurements Kraut Kraemer/Branson Co.
1/69 129 -
RT 40 RadiograpNe insp. Theory ASNT Chapter, Cleveland, Of f 2/15/93 2/24/93 UT 48 Level ll Theory. Tech. & Procedures BWNT SPIS, Lynchburg VA 3/8/94 3/11/94 PT/MT 36 Theory Techruques & Procedures BWNT, Lynchburg, VA 2/24/94 2/24/94 UT 2 ISI Proc.165 UT of Bolts & Studs -Crack Det. BWNT, Lynchburg, VA 4/5/94 4/7/94 UT 20.5 IGSCC Flaw Detection Techruques BWNT, Lynchburg, VA 1118/95 1/19/95 UT 4 UT Procedure 106 & Scan Plan ANO BWNT, Lynchburg. VA Page 3 OF 5
F, .R- A M. .A.T.O. M. .E.
CERTIFICATION OF QUALIFICATION
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- Y NAAEt Touhabsky, John S.S. NO.: 159-30-5180 8 ,
MIEVIOUS NDE EXPERIENCEJCERTIFICA TIONS:(ITEM L) 4 1
anosTPREWOUS DATEFutST) COMPANY NDE CERT, DATE LENGTH OF DATE METHOD LE'KL CERTIFIED CERTIFICATION START STOP T
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- (ITEM M) I DATE NDE HOURS COURSE DESCRIPTION
- METHOD CONDUCTED BY (COMPANY) i START STOP 3 l !W22/95 5/24/05 UT 12 Manual Scanner Tool (UT) BWNT, Lynchburg. VA mes ses ur 20 Aamsoner Analysm for Detartan BWNT, Ly@4. VA b
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Page 3 OF SA i t
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F R A.M ATO.M. .E.
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i EDUCATION:(ITEM N) SCHOOL LOCATION YEAR GRAD DEGJDIPLOMA 4 i MGH SCHOOL C._ 2-_1 High School Greensburg. PA 1958 Oiplome j
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TECMGCALOR Nahonal Rario School Cleveland, OH Electrorme Tech. Cert VOCATIONAL INST. PTR Prm Technologes Hertford. CT Weld. Proc. Engmeenna 4
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j GRADUATE SCHOOL Cleveland Siete Univ Clowedend. OH L-;-- d _
OTPER Lakeland Comm. College Menior. OH ;,- _ ,
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i f LEVEL lil APPROVAL OF CERTIFICATION:
REV. NAME . DATE ITM.REV. REV. NAME !DATE ITM. REV.
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20497E-3(12/95)
. .R.A.M.A.T.O. M. .E. CERTIFICATE OF EYE EXAMINATION 2
EYE EXAMINATION CERTIFICATION ASME BOILER & PRESSURE VESSEL CODE i SECTION lil, SECTION XI & SNT-TC-1 A This willcertify that Nt/N44 ASNV .
88 No. /4Y- Jo-S/8#
1 has been given the vIslon examinatibris listed below to assurs natural or corrected near and far distance aculty such that the individualis capable of reading J-l letters on the standard Jaeger's Teet Type Chatt for near vision, the Snellen Fraction of 2tW20 or the equivalent,e.g.,
i Titmus; and the Snenen Test attwenty feetfor farvision orits equivalent. Additionally, the indMdual has been given a color vision test resulting in distinguish contrast between colors using either the Ishihara Color Test Chart, and d.ha" M -
orator, or their equivalent. Individuals engagedin Fuelhandling orcrane operations shallreceive a stereo depth test. ,
Far Violon: Type of Test O Snellen G Other: 777ss/v.5 Jrwa/addo Natural: Right 28//J * /44 Left 2e/f3 wer Corrected: Right Nef k 4J Left Ar mM Corrective lens recivired: Yes i
@ No i
Min. Acceptance Criteria: 20/30 Snellen or equivalent in at least one eye 1
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i Near Vision: Type of Test O JaegerJ-l @ Other: 77,4.,ur drda be Natural: Right #87 N6rw^
i Left de r- me re Corrected: Right 2e//3 */4 Left te /<J #g Corrective lens required: 0 Yes Q No Min. Acceptance Criteria: 14" for J-l or character 10 for Titmus in at least one eye.
L Stereo Depth Perception: Titmus Other:
l Shephard-Fry Percentage: 15 30 50 60 85 90 95 Min. Accept %: 70 1
) Color Vision: Type of Test fagfw 44 Satisfactory Vs,,s Unsatisfactory l State Color Deficiency, N,a E
, i Name, Address, Phone Meees Pdnt or Type _/l..j2 A pry o Ar,_ w ff Slll nature and Title of'Examinor foro Mr 'fIows/t.*4tes O c'
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