ML20151W350
| ML20151W350 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/18/1987 |
| From: | Miller W GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20151W267 | List: |
| References | |
| UT-AUSTENITIC-A, NUDOCS 8808240067 | |
| Download: ML20151W350 (9) | |
Text
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SUBJECT:
SUPPLEMENT FOR AUTOMATIC ULTRASONIC NUCLEAR PLANT EXAMINATION OF DISSIMILAR METAL WELDS SERVICES DEPARTMENT UT-AUSTENITIC-A
,
- SUPPLEMENT 2 REV. 1 , PAGE 1 OF 9 PREPARED BY/DATE [
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c THIS DOCUMENT CONTAINS INFORMATION PREPARED BY THEXCENERAL ELECTRIC COMPANY FOR), THE PHILADELPHIA ELECTRIC COMPANY UPON THE CONDITJOI TH(T IT WILL.BE USED IN THE. CONDUCT OF PHILADELPHIA ELECTRIC COMPANY INTERNA BY THE PHILADELPHIA ELECTRIC COMPANY y ECHNICAll WORK'ANDlhL ETITORS, WILL'..N02 NOTFOR BE DISTRIBUTED BE RELEIS GENERAL USE, AND WIL. NOT BE USED D
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PROCEDURE: UT-AUSTENTIC-A
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REVISION:
DATE:
1 11/10/87
} PAGE: 20F9 l
.t TABLE OF CONTENTS L ,\
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SECTION p SCRIPTION PAGE 1.0 SCOPE 3
. 2.0 GENERAL 3 3.0 . REFERENCES 3 e
4.0 PERSONNEL REQUIREMENTS 3 5.0 EQUIPMENT 4 -
6.0 CALIBRATION 5
.- 7.0 EXAMINATION 7 i 8.0 DATA RECORDING 7 9.0 REPORTS AND RECORDS 8 10.0 DATA EVALUATION 9 i
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PROCEDURE NO. : UT-AUSTENTIC-A SUPP. 2
. . REVISION: 1 e DATE: 11/10 17 k ',) PAGE NO. : 30F9 1.0 SCOPE 1.1 This supplement defines the techniques, equipment, and requirements for automatic contact ultrasonic examination of dissimilar metal welds, weld buttering, and cladding materials for circurferential and axially criented flaws.
1.2 These examination; should be performed in addition to the ASME -
Section XI examinations.
2.0 CENERAL -
2.1 The ultrasonic examinations shall consist of 1/2 VEE path technique, utilizing longitudinal wave sesrch units. The applicable material thickness range for this exsmination is from 0.200" to 2.50".
2.2 Examinations shall be performed from the outside surface of the; components.
2.3 The techniques described in this supplement are the results of work
\ performed by the General Electric Company. The work was sponsored by the BWR Owners Group through EPRI.
2.4 The provisions permitted in ASHE Section XI Paragraph IWA-2240 are the basis of this supplement.
3.0 REFERENCES
3.1 The references identified in Section 2.0 of UT-AUSTENITIC-A are considered a part of this supplement as applicable.
3.2 EPRI Final Report, NP4606.LD, May 1986, Examination of Dissimilar Metal Welds in BWR Nozzle to Safe-End Joints.
4.0 PERSONNEL REQUIREMENTS 4.1 General personnel requirements are as described in Section 3.0 of UT-AUSTENITIC-A.
4.2 Examination personnel shall be indoctrinated in the use of the applicable procedures and this supplement. Evidence of this indoctrination shall be included in the final records package.
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PROCEDURE NO.: UT-AUSTENTIC-A SUPP. 2 REVISION: 1
() AGE No.: 4 of 9 5.0 EOUIPMENT 5.1 Ultrasonic Instrument 5.1.1 The GE Smart UT Data Acquisition Automated Equipment consists primarily of a microprocessor with terminel, disc drives,~and ultrasonic pulser / receiver with oscilloscopes, and automated or semi- atomated scanners.
5.1.2 The GE Smart UT II Data Acquisition Automated Equipment consists primarily of a computer with a multi-channel ultrasonic .
package capable of storing RF waveform Data utilizing automated scanners.
5.1.3 General requirements for the Ultrasonic Instrument are as described in Section 4.1 of UT-AUSTENITIC-A. A second oscillose. ope and video tape recording system may be used to record the RF waveform. .-
5.2 Search Unf.to 5.2.1 Dual element, ceramic type search units operating at nominal O frequency from 1.0 to 4.0 MHz shall be used for this examination. The examination shall be performed using refracted longitudinal waves with nominal angles in the range of 30' to 70*. Maximum piezoelectric element size (each individual element) shall be 1" x 1.5". Various roof angles and focal distances should be evaluated to choose the seach unit with the maximum signal-to-noise (S/N) ratio. Search unit size shall be selected based upon the diameter and configuration of the material to be examined to allow maximus ultrasonic coupling.
5.2.2 Transducers / Wedges of other sizes, angles, mode of propagation, or frequencies may be used where required by material characteristics, geometric configuration or for the evaluation of indications, with the approval of the responsible Level III.
5.3 Cables 5.3.1 Coaxial cable sets shall not exceed 600 ft. in length. The length and type of cable used shall be recorded on the Calibration Data Sheet.
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l PROCEDURE NO.: UT-AUSTENTIC-A SUPP. 2
. , REVISION: 1 7s DATE: 11/10/87 l
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5.4 Calibration Blocks 5.4.1 The calibration block shall be made from naterial of the same nominal diameter and wall thickness as the couponent to be examined. The calibration block shall be fabricated and welded from materials of the same or similar product form (s), analyses, and specifications as the welds being examined.
5.4.2 The calibration block shall contain, as a minimum, inside surface axial and circumferential EDM notch reflectors. Notch depths shall be approximately 20% of the Basic Calibration Block
- thickness. The length of the axial notch should not exceed 0.5".
The length of the circumferential notch shall be at least 0.5" and not more than 1.0" in length.
5.4.3 The surface finish of the calibration block shall be representative of the surface finish of the component to be examined. It is recommended that the surface finish of the weid should be approximttely 125 FMS with no valleys or weld beads present.
5.4.4 An IIW-2, DSC, or rompus block may be used as a simulator block
- for calibration checks. Other simulator blocks may also be used for the purpose of calibration checks provided they contain suf ficient reflectors to establish the checks.
5.5 Couplant 5.5.1 The couplant shall be in accordance with Section 4.3 of UT-AUSTENITIC-A.
6.0 CALIBRATION 6.1 Instrument Linearity Verification 6.1.1 Verification of the ultrasonic instrument linearity shall be in accordance with 5.1 of UT-AUSTENITIC-A.
6.2 System Calibration 6.2.1 The general requirements for calibration of the complete ultrasonic system shall be in accordance with 5.2 of UT-AUSTENITIC-A.
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PROCEDURE NO.: UT-AiiTENTIC-A SUPP. 2 REVISION: 1 2 -
DATE:
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{y PAGE NO.: 6 0F 9 6,2.2 Detr mination of beam index - Position the angle beam search unit son an IIW-2 bloca or other suitable reference block so that the beem is directed toward the appropriate radius surface. Move i che transducer parallel 'a the sides of the block until a maximus echo is obtained from the reflecting radius. The beam index point is now above the centerline of the rad, s, as scribed on the applicable block. P?. ace a mark on the siue of the wedge to ide-Mify the index point.
6.3 Sweep / Delay Calibration
, 6.3.1 Calibration of the UT system sweep / delay shall be in accordance with 5.4.1 of UT-AUSTENITIC-A accept it will not be possible to increase the bean path L3 compensate for an interference to scanning.
6.4 Sent4tivity Calibratica 6.4.1 Position the search unit or. the applicable c elibration block to detect the signal from the circumferential I.D. notch located ;
within the veld material. Maximize the signal and adjust the response to 80% FSH. This establishes the primary reference
() level.
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6.4.1.1 If a calibration block is not available that egets the specifications of 5.4.2 then an alternate calibration block (s) for the side under examination shall be utilized. '
Position the search unit on the applicabis calibrction block to detect the sigt al from the calibration notch (as).
Maximize the signal and adjust the response to 80% FSH, repeat this process if more than ona calibration block is needed.
Note the gain setting for each calibration block used. Next a ecmparison on a welded mockup bicek should be performed.
Maximize the signal from the applicable ID notch in th. ided ,
mockup, adjust the gain setting until this signal is 8L FSH, '
repeat this process fer both sides of the weld. Any dB changes i necessary between calibration block (s) and the velded mockup hall be noted. The Level III responsible for the examination
11 evaluste the recorded dB changes and determine the '
- v. ate . ' astment to the primary reference sensitivity.
(h tc. aparise, a. ed only be performed once per UT system /
sution t, *.i A qbination. <
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PROCEDURE NO. UT-AUSTENTIC-A SUPP. 2
. REVISION: 1 r -- DATE: 11/10/87 PAGE NO. 7 0F 9 6.5.2 It is recognized that at given gain setting, there will be some difference in the response between the axially oriented I.D.
notch and the circumferentially oriented I.D. notch. To account for this differente, maximize the amplitude from the circumferential I.D. nutch at 80% FSH and then maximize the amplitude of the axial I.D. notch at 80% FSH. Note this dB change on the Calibration Data Sheet for future refertece. Tais determination shall be performed for each calibrated UT system /
calibration block combination.
6.6 Calibration Record
- 6.6.1 All calibration and calibration verification data shall be recorded on the Calibration Data Sheet.
7.0 EXAMINATION 7.1 General 7.1.1 Exaninations shall be performsd in accordance with Section 6.0 of
() UT-AUSTENITIC-A as applicable.
7.1.2 Examinations shall be performed using nominal sngles of both 45*
+ 3* and 60* + 3* to supplement scans 1 through 4 (Figure 3) of UT-AUSTENITIC-A. For circumferential scans, the refracted angle shall not exceed the are sin of the inside radius /outside radius.
Alternate angles may be used if it is determined by the respons'.' . Level III that more meaningful data can be obtained.
7.1.3 Scanning sensitivity shall be established so that the average base line noise level is between 10% and 20% FSH. Base line noise levels in excess of 30% FSH shall be approved by the Level III responsible for the examination.
8.0 DATA RECORDING 8.1 If, during the examination the Level II believes that indications are caused by acks, or they are believed to be crack lib, in nature,. they shall be tu..d un the Examination Data Sheet (s) rsgard*.ess of amplitude.
8.2 All indicationa in excess of 10% FSH above the average nolge level shall be recorded on the floppy disk. If in the opinion of the Examiner a signal may mask the recording of others, the scan shall be completed.
The gate may then be moved to cover the area of interest and the suspect area rescanned.
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PROCEDURE NO. : UT-AUSTENTIC-A SUPP. 2 REVISION: 1
() DATE:
PACE NO.
11/10/87 8 0F 9 9.0 REP 0k?S AND RECORDS 9.1 Minimum Information Requireraents 9.1.1 Examination records shall include, but not necessary be limited to the following:
9.1.2 Calibration Data Sheet (Exhibit B) a) Calibration sheet identification, date and time period of calibration. .
b) name(s) of examination personnel.
c) examination procedure number and revision.
d) basic calibration block identification.
e) ultrasonic instrument identification and serial number.
, f) beam angle, couplant, and mode of wave propagation in the material.
g) orientation of search unit with respect to the pipe 4 (longitudinal or circumferential).
h) search unit identification - frequency, size, Manufacturer, and serial number.
- 1) reviewers signature, level and identification, if used, and date.
j) search unit cable type, and length.
k) times of initial calibration and subsequent and final calibration checks.
- 1) instrument settings, amplitudec, and sweep positions used to establiah primo.ry reference sensitivity.
m) thermometer serial number and required calibration block temperatures.
9.1.3 Examination Data Sheet (Exhibit C) a) data sheet indentity, examination late and tima period of examination <
b) name(s) and ASNT Level (s) of examinatien personnel c) examination procedure $nd revision d) applicable calibration sheet indentity e) weld identification f) record of indications or of volume free from indications g) volume scanned and scan limitations if any h) reveiwer' signature, level and date
- 1) search unit position and locations of recorded indications j) thectometer serial numbers and examination surface k) acoustic equivalency adjustment where necessary
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PROCEDURE NO.: UT-AUSTENTIC-A SUPP. 2 REVISION: 1
(} P GE NO. 9 0F 9 9.2 Qualificatica Report 9.2.1 The adequacy of the selected ultrasonic system / calibration block / procedure combination shall be demonstrated once on a representative mockup before the actual examination is performed.
The mockup may be the basic calibration block. The demonstration will be considered successful if the 20% notches are detected with a signal to noise ratio of 2:1 or greater.
9.2.2 A report shall be prepared to documerit the demonstration. Any change to the specified ultrasonic system / calibration -
block / procedure combint. tion shall require a demonstration on a representative mockup and preparation of a new qualification report.
10.0 DATA EVALUATION 10.1 Ultrasonic data shall be avaluated in accordance with .
LIM-UTI-Evaluation.
10.2 Evaluated data shall be reveived by a GE Level III and forwarded in accordance with contract and QA Maaual requirements for final O disposition.
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