ML20236B822
| ML20236B822 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 08/28/1986 |
| From: | Minton W BABCOCK & WILCOX CO. |
| To: | |
| Shared Package | |
| ML20236B760 | List: |
| References | |
| ISI-119, NUDOCS 8707290248 | |
| Download: ML20236B822 (9) | |
Text
{{#Wiki_filter:_ q 4 I 4 BABCOCK & WILCOX INSERVICE-INSPECTION PROCEDURE f .-]- ~ i i ISI-119, Rev. 7' L dJECT: ULTRASONIC EXAMINATION OF STAINLESS Procedure Qual. No. STEEL AND NICKEL BASE ALLOY WELD SEAMS NDE-PQ-UT-221-RO NDE-PQ-UT-222-R0 PQ-119-1 1. SCOPE: This procedure shall govern the manual contact ultrasonic examination of similar weld seams for wrought and for centrifugally'and statically cast stainless steel and nickel base i alloys. It is in accordance with ASME Boiler and' Pressure. Vessel ) Code 1980 Edition with. addenda through Winter 1981, Sections V and 7 1 XI. Circumferential, longitudinal, attachment and nozzle weld j ' seams in piping are covered by this procedure. l .I 2. SURFACE PREPARATION: The examination surface shall be in accordance with the applicable requirements of ISI-50. The weld layout shall conform to ISI-'362. 3. EXAMINER QUALIFICATIONS: 1 3.1 Examiner:' The examiner performing the examination shall be-qualified to Level II in accordance with the Babcock & Wilcox Company Administrative Procedure ISI-21. The Level II shall be responsible for and shall make disposition of the results of the examination.
3.2 Assistant
The assistant shall be qualified to at least trainee or Level I in accordance with the Babcock & Wilcox Company Administrative Procedure ISI-21. The assistant shall not independently make disposition of the results of'the i examination. The assistant shall perform the examination in accordance with this procedure - under the guidance of an examiner defined in 3.1. When the examination is performed by a Trainee, the Level II or Level III shall observe the performance of the examination to ensure that the requirements of this procedure are met. 4. EQUIPMENT: 4.1 UT Scope: A pulse-echo type ultrasonic flaw detection instrument shall be used. The instrument shall'be' equipped u with a stepped gain control calibrated in units of 2 dB or less. 4.2 Search Units: Dual element, 0.5 to 1.5 MHz, 40' thru 45* 7 refracted longitudinal wave search units, having an' effective. area of :0.49 to 2.0 square inch inclusive, shall be used for the-angle beam examination. These transducers.were ,I T PROVAL IW. III) QA APPR AL fSSUEDfREVISED,BY ISSU2' DATE REVISION DATE PAGE NO. M,.4/ W_Aa 9-17-76 8-28-86 1 OF ' 9 8707290248 070720 PDR ADOCK 05000413,; PDR G
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SUBJECT:
- ULTRASONIC EXAMINATION OF STAINLESS-ISI-119, Rev.7 STEEL AND~ NICKEL BASE ALLOY WELD. SEAMS designed 1for special application on highly attenuative materials.
Other search units' may be used ' upon approval of ' the' Babcock & Wilcox NPD Level III Examiner. 7
4.3 Couplant
A suitable liquid, semi-liquid, or paste couplant medium; Sonotrace 40; or Hamikleer'shall be applied to the examination surface. 'Each batch of materials shall have been tested for residual amounts of. total sulfur and total ' chloride.in accordance with ISI-55 and 56,'respectively. The couplant _ data base number shall be recorded on the data -sheet. Alternately, the batch number may be' used if no data - base number is available. The couplant shall be removed after examination.
4.4 Cables
Coaxial or microdot cables or' combination thereof will be used and a length of 50 feet shall not be exceeded. 5. CALIBRATION BLOCK:
5.1 Design
The calibration block design shall be in accordance with ISI-76 when the block is manufactured by B&W. 5.2 Calibration blocks shall be selected from the Listing of Examinations. 5.3 Block Temperature: The temperature of the calibration. block and the component shall be within 25 degrees F (14 degrees.C) ) of each other and these temperatures recorded on the calibration sheet and data sheets. 6. EQUIPMENT CALIBRATION: Instrument calibration for screen height and amplitude control linearity shall be verified at the beginning and end of the weld examinations performed during one outage and I after repairs. The amplitude control linearity shall be verified. over its useful range. Perform these measurements as outlined in B&W Procedure ISI-120. Angle beam search unit measurements shall be performed before ex'aminations are performed each day. Perform these measurements as outlined in B&W Procedure ISI-120. I b Page 2 of 9 6 .._.-_-_-____a
BABCOCK & WILCOX INSERVICE INSPECTION PROCEDURE __~
SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS ISI-119, Rev.7 STEEL AND NICKEL BASE ALLOY WELD SEAMS 7. AREA OF INTEREST: The area of interest is the volume to be examined as defined in the Examination Requirements section of the Technical Manual. 8. SYSTEM CALIBRATION:
8.1 Range
The sweep range calibration shall be performed using the calibration block. The sweep range should be set to cover the range of thickness to be examined. The maximum 1 thickness should appear at no greater than 80% of the full screen sweep. 8.2 Angle Beam Sensitivity: The sensitivity level for the examinations shall be established by positioning the search-units to obtain the proper responses from the applicable calibration reflectors. When examining in the axial direction, calibration sensitivity shall be established using j the reflectors which are oriented perpendicular to the block axis. When examining in the circumferential direction, calibration sensitivity shall be established using the reflectors which are oriented parallel to the block axis. The calibrations shall be established with the sound beam oriented essentially perpendicular to the reflector axis and the search unit centerline at least 3/4" from the nearest side of the block. Rotation of the beam into a corner formed 7 by the reflector and the side of the block is not permitted. The calibration shall be performed from the surf ace (clad or unclad) of the calibration block which corresponds to the component surface to be examined. The sensitivity for the examination shall be established as follows: 8.2.1 Determine the slope of the DAC curve by positioning the search unit to obtain responses from the applicable hole reflectors; i.e., axial or circumferential, 1/2 T or 3/4 T holes. Set the highest response from the holes to 80% (F 15%) FSH by adjusting the sensitivity control. With'out changing Page 3 of 9 s
BABCOCK'& WILCOX .NC0X1-10__D INSERVICE INSPECTIO
N. PROCEDURE
ISI-119, Rev.7 ULTRASONIC EXAMINATION OF STAINLESS
SUBJECT:
STEEL AND NICKEL BASE ALLOY WELD SEAMS the gain, mark this and each of'the remaining responses at their respective' amplitudes on the face o f the CRT. Connect the screen marks and extend through the 8.2.2 thickness to be examined. Position the search unit to obtain the maximum-If the notch amplitude 7
- 8. 2. 3.
response from the ID notch. less than the DAC: curve, increase the gain to equalize ~ This shall be the the notch response and the curve. If the-notch primary reference level (sensitivity).- amplitude is greater than the.DAC curve, the notch response may be ignored and the primary reference level (sensitivity) shall be that of the DAC' curve. l -] 8.3' calibration Confirmation:. Sweep _ range and amplitude calibrations shall be verified: at the beginning of each of examination. 8. 3.' 1 at intervals not to exceed 12 hours. 8.3.2 with every change of examination personnel. 8.3.3 at the finish of examinations for each thickness 8.3.4 range. l if the operator suspects any malfunction of the. UT 8.3.5 system. after any change in search units,. shoes, couplants, i cables, ultrasonics instr uments, or any, other parts of 8.3.6 the examination system. 8.3.7 in the event of any power loss. The original and final calibration must be performed on the basic calibration block. Intermediate calibration checks may If a be performed on a calibration block simulator. calibration. block simulator is used, it shall be able' to The simulator produce known. amplitude and sweep readings. produced amplitude and sweep readings shall be recorded on. the calibration sheet at initial calibration and each calibration check. If multiple DAC curves are used for l L -Page 4 of 9
1 ~ ' BABCOCK-E.WILCOX i--] } ! } l j INSERVICE INSPECTION PROCEDURE l i o
SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS ISI-119, Rev.7-STEEL'AND NICKEL BASE ALLOY WELD SEAMS 1 different types of examinations, the calibration block 1 D simulator shall be used for each type. Each of the calibration DAC points shall be verified within one day prior ' to use and at least once each week during examination. - l 8.4 Calibration ~ Changes: If'the sensitivity has decreased by more than 20% in amplitude or if the sweep reading has. j changed by more than 10%, all data sheets since the last 1 calibration.shall be marked void. A new calibration shall be I made and recorded and the' voided examinations areas shall be reexamined. s 1 If the sensitivity has increased more than 20% in amplitude, l recorded indications taken since the last valid calibration i or calibration. check may be reexamined with the correct sensitivity and their values. changed on the dataisheets. 3 1 9. SCANNING REQUIREMENTS: 1
9.1 Applicatio'n
The area of interest shall be examined by angle beam using DAC calibrations. A 45 angle beam should be q directed' normal to the weld from.both sides where practicable. The beams shall pass through all of.the area of interest in two opposing. directions where practicable.. The angle beam shall be directed parallel to the weld in both directions to examine the area of interest by one-half V-path. For nozzle -welds, the beam shall be. directed normal to the weld and at 45* to the longitudinal axis of the weld. l 9.2 Movement Rate:.The rate of search unit movement shall not l exceed 6 in/ cec., unless calibration is verified at-scanning l speed. l 9.3 Search Unit Coverage: Each pass of the search unit shall overlap a minimum of 10% of the transducer active element l dimension perpendicular to the direction of scan. 9.4 Scanning Sensitivity: Scanning shall be. performed after increasing the gain 14 dB above the reference level, if possible. However, if noise levels are excessive at this sensitivity, less. gain may be used, although a minimum of 6 dB above reference'shall be maintained. Fourteen.dB above. reference will increase the signal amplitude by a factor of five, making the primary' reference curve.a 20% DAC. curve. Page 5 of 9
4, 1 'j((%'"'}([~~I) j BABCOCK & WILCOX ~ 'I' INSERVICE INSPECTION PROCEDURE
SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS ISI-119, Rev.7 STEEL AND NICKEL BASE ALLOY WELD SEAMS Six dB above will result in a primary reference curve of 50%. Recording of peak indications requires that the signal amplitude be adjusted to the DAC curve using the dB control. a True signal amplitude shall be obtained f rom the following 1 i chart using the observed change in the dB control. dB %DAC %DAC dB l -) 0 100 100 0' -1 112 90 +1 -2 125 80 +2 -3 141 70 +3 -4 159 63 +4 -5 178 56 +5 -6 200 50 +6 -7 224 45 +7 l l -8 251 40 +8 -9 282 36 +9 -10 316 32 +10 -11 355 28 +11 -12 400 25 +12 -13 447 22 +13 -14 501 20 +14 -15 562 18 +15 i -16 631 16 +16 1 -17 708 14 +17 -18 794 13 +18 l -19 891 11 +19 l -20 1000 10 +20 1
- 10. RECORDING STANDARDS:
All applicable data shall be recorded on the data sheet. 10.1 Area of Interest: All indications which produce a response greater than 20% of DAC reference level shall be investigated to the extent that the examiner can determine the shape, identity, and location of all such reflectors. If the examiner is in doubt as to the nature of the reflector, it s shall be recorded. Any doubt may be resolved by radiog raphy. 1 10.1.1 Where indications are determined to be cracks, lack of fusion, lack of penetration (regardless of signal amplitude), or where the maximum signal amplitude of an indication exceeds 50% of DAC, the following shall l be recorded. Page 6 of 9 l l
1 BABCOCK & WILCOX gL ] INSERVICE INSPECTION PROCEDURE l' Iil
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SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS ISI-119, Rev.7 STEEL AND NICKEL BASE ALLOY WELD SEAMS 10.1.1.1 Amplitude: Record the amplitude to the nearest 5 percent increment of the maximum signal in the appropriate block. 10.1.1.2 Depth: The depth of the indication should be recorded at the point of maximum amplitude. In addition, the minimum and l maximum depth of the indication shall be recorded. 10.1.1.3 Length: The 50/50% and.100/100% DAC (if applicable) length is to be recorded on each ' i indication. Where 360* intermittent or 360* continuous indications are involved, the length recorded shall be the entire length of the weld. 10.1.1.4 Location: To properly document the location of the indication, it is necessary that the distance from surface "1" or "2" and the distance from position "A" or "B" be recorded. This information should be recorded at the point of maximum aplitude, j at the 50% and 100% (if applicable) DAC end points, and at the positions of minimum and maximum depth as recorded in 10.1.1.2. It i is not necessary to record the diste.nce " A" or "B" when documenting 360* intermittent or l 360* continuous indications. 10.1.1.5 Damps: All indications should state whether or not they damp. 10.2 Indication characterization: The indication characterization definitions of ISI-120 may be applied to the data recorded by the requirements of this procedure.
- 11. REPORTING STANDARDS:
All indications detected in the area of interest which produce signal amplitudes greater than 50% DAC shall be processed and evaluated in accordance with ISI-69. In the event that an indication is identified as a flaw which requires evaluation in terms of acceptance / rejection, such Page 7 of 9 4 N^^ __._m m_m.____.w
O {i [' [ ~ - ) BABCOCK & WILCOX ~ INSERVICE INSPECTION PROCEDURE
SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS ISI-119, Rev.7 STEEL AND NICKEL BASE ALLOY WELD SEAMS I 1 evaluation may be based upon review of radiographic results. The RT performed for this purpose shall meet the minimum requirements of Section XI. Any area where limited or no examination was performed shall be recorded on the limited scan data sheet and l reported to the customer. l
- 12. RECORD OF EXAMINATION RESULTS:
A copy of the examination data shall be provided to the customer with the following information ] in accordance with ISI-64 and ISI-69. i. 12.1 Contract number i l 12.2 Examination personnel by name and/or ID number 12.3 Instrument by ID number j 12.4 Method of test 12.5 Couplant by batch or ID number l 12.6 Calibration sheet ) i 12.7 Weld identification and location 12.8 Type, size, and frequency of search unit by ID number 12.9 Ultrasonic wave mode and angle 12.10 Calibration block aber l 12.11 Chart of results 12.12 Procedure number and revision 12.13 Dates and times of examination 12.14 Examination surface 12'.15 Layout of weld seams as detailed in ISI-362 12.16 The numbe r( s) of a change authorization (s) that affect (s) this procedure l l Page 8 of 9 1 L_________
xb o ]' INSERVICE INSPECTION PROCEDURE -{ ~ BABCOCK & WILCOX s
SUBJECT:
ULTRASONIC EXAMINATION OF STAINLESS-ISI-119, Rev.7 STEEL AND NICKEL-BASE ALLOY WELD SEAMS i 12.17 Orientation of search unit with respect to pipe i 12.18 Search unit cable type and length i 12.19 Times of calibrations and calibration checks i l 12.20 Amplitudes and sweep readings obtained from the calibration reflectors j i 'l i \\ a Page 9 of 9 .}}