ML20151W345
| ML20151W345 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/28/1987 |
| From: | Miller W, Odonnell F GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20151W267 | List: |
| References | |
| UT-AUSTENITIC-A, NUDOCS 8808240062 | |
| Download: ML20151W345 (8) | |
Text
I S L'3 JECT StfPPLEMENT FCP. ULTRASONIC EXAMINATION NUCLFAR FIELD SERVICES OF WELD OVERLAYED AUSTENITIC PIPING
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RECE VED d M P^ ^^ *6'"d GCT 0 21987 OECHTEL STATEMENT OF INTENDED USE TilIS DOCU1! Flit CONTAINS INFORMATION PREPARED BY THE CENERAL ELECTRIC COMPANY FOR THE PHILADELPHIA ELECTRIC COMPANY UPON THE CONDITION THAT IT WILL BE USED IN THE CONDUCT OF PHILADELPHIA ELECTRIC COMPANY INTERNAL TECHNICAL WORK AND WILL NOT BE RELEASED BY THE PHILADELPHIA ELECTRIC COMPANY TO COMPETITORS OF T!!E GENERAL ELECTRIC COMPANY, WILL NOT BE DISTRIBUTED FOR CENERAL INDUSTRY AND WILL NOT BE USED DIRECTLY OR INDIRECTLY IN AN UNFAIR COMPETITIVE !!ANNER TO THE INTERESTS OF THE CENERAL ELECTRIC C0!!APNY.
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Procedure:^(Tf-AUSTENITIC-A SUPPLEMENT l-Revision:
1 Date: ~0/24/87 .t
. Page: .2 of 8 C. 1 LO- !
l TABLE OF CONTENTS SECTION DESCRIPTION PAGE 1.0 SCOPE 3 4
2.0 REFERENCES
3
'3.0 SEARCil UNITS 4 4.0 CALIBRATION BLOCKS 4 5.0 CENERAL EXA!!INATION REQUIREMENTS 4 6.0 CALIBRATION 4 ,
, 7.0 EXA!!INATION 5~
8.0 DATA RECORDING 7 O 9.0 REPORTS AND RECORDS 7 FIGURE 1 EXAMINATION ZONES AND VOLUl!E 8 i
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'@rocucu;e:^Uf-ADSI6HLILG-A SUPPLEMENT 1
, Revision: 1 Date: 8/24/87 Page: 3 of 8
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e 1.0 SCOPE 1.1 This supplement describes the methods, equipment and requirements for ultrasonic exanination (!!T) of weld overlayed austenitic piping welds. The examination is applicable to both the weld overlay deposit and the full thickness of weld and base material beneath the overlay.
1.2 Application of this procedure is limited to weld overleyed full penetration butt welds and adjacent base metal having a nominal base material wsil thickness of 0.20" to 2.5" and a overlay material thickness of 0.15" to 0.60", for a total range of 0.35" to 3.10" of combined metal.
For overlay thickness greater than 0.60", a successful calibration demonstrating complete compliance with the intent cf this procedure must be performed and' approved by the cognizant Level III.
1.3 Examination techniques utilized include 0* longitudinal wave and refracted longitudinal wave scanning.
1.4 The examinations shall be performed from the outside surface of the applicable veld overlayed component.
1.5 The techniques described herein are to be used in conjunction with and as a supplement to the basic procedure UT-AUSTENITIC-A. Any need for deviation from the criteria of this supplement shall be reported to the
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s cognizant Level III for disposition and approval prior to implementation.
Approval may be documented during data evaluation.
2.0 REFERENCES
2.1 The following documents have been referenced in the preparation of this supplement and are considered a part of this supplement to the excent specified herein.
2.1.1 American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, Rules for Inservice Inspection of Nuclear Power Plant Components, 1980 Edition, including Addenda through Winter 1981.
2.1.2 American Society for Mechanical Engineers (ASME) Boiler and Pressure Code,Section V, "Nondestructive Examinations", Article 5, 1980 Edition, including addenda through Winter 1981.
2.1.3 General Electric's MDE Personnel Qualification Procedures AP-GQUA-277 and QC-2, which meet the requirements of the American Society for Nondestructive Testing (ASNT) Recommended Practice, SNT-TC-1A, 1975 and 1980 Editions.
2.1.4 Weld Overlay Workshop, developed by EPRI NDE Center.
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SUPPLEMEffT 1 Revision: 1 Date: 8/24/87 Page: 4 of 8 b
3.0 ,Scarch Units 3.1 For examination of the overlay and base / weld material beneath the overlay refracted lon~gitudinal wave search units shall be used. Minimum transducer element size shall be .2". !!aximum size will be dictated by the ability of the transducer to maintain proper contact and coupling on the pipe being examined. Transducers in the frequency range from .75 to 5 MHz are recommended. The transducer angles should be in accordance with paragraphs 5.1 and 5.2.
4.0 Calibration Blocks 4.1 Basic calibration blocks shall be cade of material (pipe) of the same nominal composition, diameter, and wall thickness or pipe schedule as the piping to be examined. A block of the same nominal thickness of base material overlayed with weld material in the thickness range expected on the parts to be examined, shall be used. The surface finish of the block shall be representative of the surface finish of the overlayed welds to examined.
5.0 General Examination Requirements 5.1 Angle beam examination of weld overlayed circumferential or longitudinal welds an<
associated base material shall be performed using a two-zone exam techo,ique. The zones and beam angles are defined as:
/~'i Zone 1: From the O.D. surface to include the outer 1/2 of the
(_) The recommended beam angle material thickness.
for Zone 1 is 70'.
2$i Zone 2: From the 1/2t point to include the inner 1/2t of material thickness. The recommended beam angle for zone 2 is 45*.
Alternate beam angles may be used with the approval of the cognizant Level III.
5.2 A 0* longitudinal wave examination shall be performed, to the extent practical, o-the overlay material and the weld and base material beneath the overlay.
5.3 It is recommended that the surface finish on the examination area be 125 RMS or better with a waviness (out of flatness) tolerance of .031 in/in max. Smooth search unit movement over the examination surface shall be ensured.
5.4 Surf ace preparation and cleaning operations are not within the scope of this supplement.
6.0 calibration 6.1 Sucep Range Calibration - A suitable calibration block shall be used to calibra the UT instrument search unit combination for sweep range over the metal path o depth to be used.
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Procedura: UT-AUSTENITIC-A SUPPLEMEN1- 1 Revision: 1 Date: 8/24/87 Page: 5 of 8 Q 6.2 0* Calibration 6.2.1 Calibration for the 0* examination shall be established as follows.
Fosition the search unit on the applicable overlay calibration block and obtain a peaked signal amplitude from the 1/4e hole. Adjust the instrument gain to provide a signal amplitude of 80% FSH. Record the depth reading and attenuation setting on the Calibration Data Sheet. This shall be the primary reference se,tsitivity and establishes calibration.
6.3 Angle Beam Calibration 6.3.1 Calibration for Zone 1 shall be established as follows. Position the search unit on the applicable overlay calibration bicek and obtain a peaked signal amplitude from the 1/2t hole. Set the amplitude to 80% FSH. Record the attenuation setting and depth reading on the Calibration Data Sheet. This establishes primary reference sensitivity for zone 1.
6.3.2 Calibration for Zone 2 shall be established as follows. Position the search unit on the applicable overlay calibration block and obtain a peaked signal from the 3/4t hole. Set the response to 80% FSH.
This establishes primary reference sensitivity for Zone 2. Obtain a ,
signal response from the ID notch. The gates shall be set to record a minimum of 5/4t. Record the attenuation setting and depth readings on the Calibration Data Sheet.
("A t ' ') 7.0 Examination 7.1 Scanning Sensitivity 7.1.1 0' Technique- Scanning sensitivity shall be conducted at a ninimum of (2x) two times the reference sensitivity when possible.
At no time shall 1 canning be performed at less than the referenct sensitivity established during calibration without the approval of the cognizant Level III. Approval may be documented during data review. It is intended that scanning sensitivity be sufficient to maintain an average 80% FSH back reflection wherever possible.
7.1.2 Angle 3eam Technique- Scanning sensitivity shall be conducted with a gain setting that provides an average ID noise level between 5% and 25% in the part to be examined. At no time will the scanning sensitivity be less than the reference sensitivity established durin; calibration without the approval of the cognizant Level III.
Approval may be documented duri.ng data review.
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Prucedura: UI-AUSTENITIC-A SUPPLEKEKI 1
. Ravision: 1 Date: 8/24/87 Page: 6 of 8
() 7.2 0* Examination 7.2.1 The O' examination shall he performed on the overlay and the weld and base material beneath the overlay to the extent possible. This examination is performed to verify the integrity of the overlay to base material bonding and to detect laminar reflectors in the base material beneath the overlay that could interfere with angle beam examinatfons.
7.3 Angle Beam Examinations 7.3.1 Examination for Zene 1.
7.3.1.1 Reflectors Oriented Parallel to the Weld The search unit shall be placed on the weld overlay surface with the sound beam directed perpendicular to the veld beneath the overlay deposit, oscillating approximately +10' and manipulated laterally and longitudinally so that the sound beam passes through the examination zone as shown in Figure 1. The search unit shall then be turned 180', and the scans repeated.
7.3.1.2 Reflectors Oriented Transverse to the Weld The search unit shall he placed on the weld overlay surface '
with the sound beam directed parallel to the weld beneath the overlay deposit, oscillated approximately + 10* and manipluated laterally and longitudinally so that the sound beam passes
(~} through the Examination zone as shown in Figure 1. The search
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unit shall then be turned 180' and the scans repeated.
7.3.1.3 Scans shall be Identified as shown in the base procedure.
7.3.2 Examination for Zone 2 7.3.2.1 Reflectors Oriented Parallel to the weld The search unit shall be placed on the weld overlay surface with the sound Team directed perpendicular to the weld beneath the overlay deposit, oscillated approximately + 10' and manipulated laterally and longitudinally so that the sound beam passes through the examination zone as shown in Figure 1. The examination shall be performed from both sides of the veld beneath the overlay deposit where configuration permits.
7.3.2.2 Reflectors Oriented Transverse to the Weld To detect discontinuities which are assentially transverse to the weld, the skew angles for various pipe wall thicknesses are as shown in the base procedure. The examination shall be performed on the required volume in 2 directions as shown in Figure 1.
Other skew angles may be used if in the opinion of the Level III note meaningful data can be obtained.
7.3.2.3 Scans shall be identified as shown in the base procedure.
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Procsdura: UT-AUSTENITIC-A SUPPLEMENT l
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( ) ). Recording 3.i O' Indications 8.1.1 Base ttaterial ' Indications Record back on the data sheet all areas of base material which exhibit a total loss of reflection. If numerous overlapping indications of lescer amplitudes exist which in the opinion of the Level II could prevent a meaningful angle beam exanination they shall be documented.
8.1.3 Indications Within the Weld and Required Volume 8.1.2.1 - 0* Indications in excess of 10% FSH above the average noise level shall be recorded on the floppy disk.
8.1.2.2 If, during the examinations the Level II believes that indications are caused by cracks, lacks of fusion, or lacks of penetration, they shall be noted on the r
Examination Data Sheet (s) regardless of amplitude.
8.2 Angle Beam Indications 8.2.1 All angle beam indications in the examination volume in excess of 10% FSH above
- he average noise level shall be recorded on the floppy disc. Indications
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observed on the CRT, which emanate at the root (ID surface) and travel along the sweep toward the OD shall be investigated regardless of amplitude. 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.
8.2.2 If, during the exaninations the Level II believes that indications are caused by cracks, lack of fusion, or lack of penetration, they shall be noted on the Examination Data Sheet (s) regardless of amplitude.
8.3 Final evaluation and dispositioning of indications is the responsibility of PECO.
9.0 REPORTS AND RECORDS 9.1 Reports and records shall be in accordance with the base procedure.
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Procedure: UT-AUSTENITIC-A SUPPLEMENT 1 Revision:- 1 Date: 8/24/87 Page: 8 of 8 s
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