ML20215B763

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Rev 3 to NDE & I Instruction Qci 6-13, Ultrasonic Exam of Piping Welds (Manual)
ML20215B763
Person / Time
Site: Columbia Energy Northwest icon.png
Issue date: 03/20/1986
From:
WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML20215B717 List:
References
QCI-6-13, NUDOCS 8612120307
Download: ML20215B763 (22)


Text

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'QCI 6-13 WASHINGTON PUBLIC POWER SUPPLY SYSTEM a ev, no, 3

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NDE & I INSTRUCTION '"'*3'-8T' 4WA6.4Tv AFFEC7i G YES Oaa ULTRASONIC EXAMINATION OF PIPING WELDS (MANUAL) 1.0 PURPOSE AND SCOPE

=O 1.1 This instruction defines the method for manual contact ultrasonic examination of similar and dissimilar metal welds in piping systems 0.2 to 6.0 inches in thickness. The methods outlined in this instruction meet the requirements of the ASME Boiler and Pressure Vessel Code,Section XI,1980 Edition through Winter 1980 Addenda O and Appendix III.

1.2 These examinations may be performed by Supply System personnel or by a Supply System Contractor under Supply System supervision.

2.0 DEFINITIONS O

None 3.0 PROCEDURE 3.1 Personnel Qualifications

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3.1.1 Supply System personnel shall be certified in accordance with Reference 6.2.

3.1.2 Contractor personnel shall be certified to the contractor's Quality Assurance Program provided the program has been O approved by the Supply System. As an alternative, the contractor personnel shall be certified in accordance with 3 Reference 6.2.

$ 3.1.3 Personnel designated as trainees may assist the Level II ~i

$8 or III in performance of the examinations to this O gg instruction.

g 3.1.4 Level I individuals shall perform only specific setups, , ,

rio calibrations, tests or record data to the requirements of

@@ this instruction and shall implement this instruction only with the direct participation of a Level II or higher

-O e individual. The Level I shall not independently evaluate '

$@cs or accept the results of the examinations performed to this instruction.

3.1.5 Examination teams shall include at least one Level II or Level III UT examiner.

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'O OCI 6-13 Rev. 3

'0 3.2 Ultrasonic Instruments - The pulse-echo, ultrasonic flaw detection instruments shall be equipped with a stepped gain control, gradu-ated in units no larger than 2 dB. Instruments considered accep-table for examination are listed below; other instruments may be used if the model type is qual.ified.

.O Krautkramer USIP-11 KRautkramer USL-48 Nortec NDT-131 or 131D 3.3 Transducers 3.3.1 Straight Beam - Single or dual element ceramic type trans-

.O ducers having an area from 0.049 to 1.0 square inch shall be used. Base material examinations and thickness measurements will normally be conducted using a 2.25 or 5.0 MHz longitudinal wave transducer; however, other fre-quencies may be used where metallurgical characteristics prevent effective use of 2.25 or 5.0 MHz transducers.

3.3.2 Angle Beam - Single or dual element ceramic type trans-ducers having an area from 0.049 to 1.0 square inch shall be used. The initial examination will normally be con-ducted using 2.25 MHz shear wave transducers with a beam angle of 43 to 47 degrees. Other angles and wave modes

O may be used for evaluation or indications and where wall thickness or geometric configuration impedes effective use of the 45 degree angle. The tolerance for other angles shall be +3 degrees. Transducers of other frequencies and wave modes may also be used for evaluation of indications or where metallurgical characteristics prevent effective
O use of 2.25 MHz shear wave transducers. The transducer exit point and beam angle shall be verified, prior to examination, using an IIW (International Institute of Welding) or Rompas calibration block.

3.4 Couplant - Ultragel II or an equivalent shall be used as the O liquid couplant. Certification of acceptable sulfur and halogen content shall be obtained and made available for each lot or batch number.

(a ) Couplant shall be analyzed for sulfur content in accordance with ASTM D129-64. The sulfur content of the residue

.o shall not exceed 1% by weight.

(b) Couplants shall be analyzed for chloride content in accordance with ASTM 0808-63. The chloride content of the residue shall not exceed 1% by weight.

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. QCI 6-13 Rev. 3 O

3.5 Calibration Blocks - Calibration blocks shall be as specified in Section 14 of the Inservice Inspection Program Plan or as specified by the Responsible Technical Organization (RTO).

3.6 Surface Preparation - The finished contact surfaces shall be free from weld splatter or any roughness that would interfere with free movement of the search unit or coatinos which would impair the

'O transmission of ultrasonic vibrations.

3.7 Instrument Calibration - The ultrasonic instrument linearity shall be checked each day prior to its use and documented on the Cali-bration Data Sheet shown in Attachment 7.2. Linearity shall be determined in accordance with the requirements of Paragraphs (a)

O and (b) below:

(a) Screen Height Linearity Check - To verify the ability of the ultrasonic instrument to meet screen height linearity requirements, position an angle beam search unit so that responses can be observed from any two reflectors in a

'O calibration block. Adjust tne search unit position to give a 2 to 1 ratio of amplitudes between the responses, with the larger set at 80% of full screen height (FSH).

Without moving the search unit, adjust the gain control to successively set the larger signal from 100% to 20% FSH in 10% increments or in 2 dB increments if the instrument is

. O(x equipped with a stepped gain control. The smaller signal amplitude must be 50% of the larger amplitude signal within 5% FSH. Instruments that do not meet this requirement shall not be used.

(b) Amplitude Control Linearity Check - To verify the accuracy

O of the amplitude control in the ultrasonic instrument, position a search unit so that a response from a reflector in the calibration block is peaked on the screen. The signal amplitude shall be brought as near as possible to 80% FSH with the dB control. If necessary, the final

, , adjustment to 80% FSH can be made with the variable gain

'o control. Using only the dB control, the dB changes indi-cated below shall be made and the resulting amplitude compared with the allowable amplitude limits. The proce-I dure shall be repeated for 40% and 20% FSH amplitudes.

The initial settings and readings shall be estimated to

, the nearest 1% of full screen. Instruments that do not lg meet this requirement shall not be used.

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O l QCI 6-13 Rev. 3 Initial Amplitude dB Control Amplitude Limits O Set at % FSH Change in % FSH 80 -6 32 to 48 80 -12 16 to 24 40 +6 64 to 96 20 +12 64 to 96 3.8 General Requirements for Examination Calibration 3.8.1 Calibration shall be performed from the surface of the calibration block which corresponds to the component surface to be examined.

O 3.8.2 The calibration block temperature shall be within 25'F of the component being examined.

3.8.3 Calibration shall include the complete ultrasonic 'examina-tion system. Any change in couplants, cables, transducers, O wedges, ultrasonic instruments, or any ather parts of the examination system shall be cause for i calibration check.

(a) At least every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during an examination; (b) At the start and finish of each completed examination;

'O (c) At each change of examiners; (d) In the event of loss of power; and (e) If any part of the examination system has been

.O changed, such as, search units, cables or ultrasonic instruments; (f) If the operator suspects a malfunction.

. 3.8.5 Calibration checks may be performed en a secondary refer-lC ence, such as an IIW, Rompas block or equivalent, provided l

the response from the block has been referenced after initial calibration. The tolerances of 3.8.7 and 3.8.8 shall apply for this operation.

3.8.6 Final calibration shall be performed on the calibration O block used for initial calibration.

3.8.7 Recalibration (Sweep Only) - If the indication from any j of the calibration reflectors has moved on the sweep line l more than 10%, correct the sweep range calibration and note the correction on the Calibration Data Sheet. If

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QCI 6-13 Rev. 3 1

recordable indications were noted on the Examination Data

" C) Sheets, those data sheets shall be voided. A new calibra-tion shall be made and recorded and.the voided examination areas shall be reexamined.

3.8.8 Recalibration (Amplitude Only) - If the amplitude of any of the calibration reflectors has changed by more than 2 l C) - dB, all data sheets since the last acceptable calibration check shall be marked void. A new calibration shall be made and recorded and the voided examination areas reexamined.

3.8.9 All required calibration data shall be recorded on the

C) . Ultrasonic Calibration Data Sheet, Attachment 7.2.

3.9 Oualification - Prior to use of this instruction, the calibration tecnniques in 4.0 shall be demonstrated in the presence of an Authorized Nuclear Inspector. The successful completion of these calibrations shall be documented on Calibration Sheets, Attachment C) 7.2. These calibrations shall serve as a generic qualification for record purposes only as the instruction is essentially quali-fied upon each successful calibration used during the course of

+he weld examinations.

4.0 PROCEDURE

C)I' 4.1 Angle Beam Calibration 4.1.1 Calibrate the instrument sweep to the required sound path distance using an IIW, Rompas or an equivalent block having known dimensions. The sweep calibration shall be suffici-( C) ent to include all reflectors required to construct the distance-amplitude correction (DAC) curve.

4.1.2 For the examination of piping welds using the 1/2 "V" path

, technique, the calibration shall be performed in accordance with the following to detect reflectors parallel or trans-() verse to the weld:

(a) Position the search unit for maximum response frcm the side drilled hole (1/8, 2/8 or 3/8 node) which produces the highest amplitude signal. For this operation, the centerifne of the search unit shall be c) at least 3/4" from the nearest side of the calibration block to avoid using the reflection frcm the hole and the side of the block. Adjust the instrument gain to set this signal at 80% of full screen height and mark the location and amplitude of the signal on the screen.

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O QCI 6-13 Rev. 3 (b) Without changing the instrument controls, maximize O the signal of the two remaining holes and mark their amplitudes and locations on the screen.

(c) As an alternate, if the calibration block is designed such that it only contains a 1/2 T side drilled hole, position the search unit for maximum re::ponse from 0 this hole. Then adjust the instrument gain to set this signal at 80% of full screen height and mark the location and amplitude of the signal on the screen.

Without changing the instrument controls, maximize the signal from this hole at the 6/8 node position and mark the amplitudes and locations on the screen.

O (d) Connect these points on the screen with a line and extrapolate the curve an additional 1/4 T to cover the full examination thickness. This completes the construction of the DAC curve only.
O (e) To determine the primary reference level, position the search unit to obtain the maximum response from the notch at the 1/2 "V" path location. Adjust the amplitude of the notch to be equal to the DAC curve.

This is the primary DAC reference level.

g (f) Record and plot all calibration data on the appropri-ate areas of the Calibration Data Sheet.

(g) After the primary DAC reference level has been established on the pipe calibration standard, a cali-bration reference response may be established on a

'O Rompas or other standard reference block. The response shall include both sweep and amplitude

,_ calibration points and the gain setting used to establish them. This information shall be recorded on the appropriate area of the Calibration Data Sheet.

This reference response may then be used to perform '

~O calibration checks. Final calibration, however, shall be performed on the pipe calibration standard.

4.1.3 For the examination of piping welds using the 1 "V" path or greater technique, the calibration shall be performed in accordance with the following to detect reflectors g parallel or transverse to the weld:

(a) Position the search unit for maximum response from the circumferrential notch on the opposite side of the calibration block and adjust the instrument gain to set the response at 80% of full screen height.

Mark the location and amplitude on the screen.

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QCI 6-13 Rev. 3 (b) Without adjusting the gain, obtain responses from the O notches at 1 and 1-1/2 or greater "V" path locations.

Mark the locations and amplitudes on the screen.

.' : ) Connect the points with a line. This is the primary DAC reference level.

O (d) Record and plot all calibration data on the appropri-ate areas of the Calibration Data Sheet as shown in Attachment 7.2.

(e) After the primary DAC reference level has been established on the pipe calibration standard, a O calibration reference response may be established on a Rompas or other standard referance block. The response shall include both sweep and amplitude calibration points and the gain setting used to establish them. This information shall be recorded on the appropriate area of the Calibration Data Sheet, j O This reference response may then be used to perform calibration checks. Final calibration, however, shall be performed on the pipe calibration standard.

4.2 Straight Beam Calibration - Preservice Inspection Only orl 4.2.1 Calibrate the instrument sweep to a distance sufficient to include the thickness of the material being examined using an IIW, Rompas or an equivalent block having known dimensions.

4.2.2 For the examination of piping, fabricated from plate O material, for laminar reflectors, calibration shall be performed according to the following:

(a) Position the search unit on the part to be examined using sufficient gain to produce a back reflection from the part of at least 80% full screen height.

.O (b) Record and plot all calibration data on the appropri-ate areas of the Calibration Data Sheet. l 4.3 Straight Beam Examination of Plate Material - Preservice Inspection Only

O 4.3.1 This examination shall be performed only on pipe and/or fittings fabricated from plate material.

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OCI 6-13 Rev. 3

.f 4.3.2 For detection of laminar reflectors in plate material, the

= () search unit shall be placed on the base material and mani-pulated to ensure coverage of the entire area through which the sound must pass during the angle beam examination.

4.3.3 The instrument gain shall be adjusted during the examina-

. C) tion to maintain a back reflection of at least 50% full t

screen height while scanning.

4.4 Angle Beam Examination of Welds 4.4.1 For detection of reflectors parallel to the weld, the search unit shall be placed on the contact surface with '

C) the beam essentially perpendicular to the weld centerline.

The search unit shall be manipulated to ensure the sound beam passes through the entire area of interest using the 1/2 or 1-1/2 or greater "V" path examination technique from both sides of the weld. Physical or other limitations which prevent complete examination of the area of interest C) shall be documented on the Examination Data Sheet.

4.4.2 For detection of reflectors transverse to the weld, the search unit shall be placed on the weld with the beam directed along the weld in two opposite directions.

C) 4.4.3 As an alternate, if the weld contour is such that the examination cannot be performed from the weld crown, the search unit shall be placed directly adjacent to the weld edge. The sound beam shall be directed parallel to the weld and the search unit manipulated laterally and longi-tudinally. Physical or other limitations which prevent

C) complete examination of the weld area shall be documented on the Examination Data Sheet.

4.4.4 Welds that cannot be examined from at least one side using the angle beam technique shall be examined by another volumetric method.

4.5 Scanning Requirements for Angle Beam Examination 4.5.1 Area of Interest - The area of interest is the volume of material which is to be examined and shall include the inner 1/3 T of the weld and 1/4 inch of adjacent base

' () material on both sides of the weld as measured from the weld crown edge.

. C)

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q QCI 6-13 Rev. 3 t

4.5.2 The area of interest shall be examined from both sides, O when possible, with the search unit directed normal to the weld for detection of reflectors parallel to the weld using the 1/2 or 1 or greater "V" path examination technique whichever is applicable.

4.5.3 For examination of reflectors transverse to the weld, the

O search unit shall be placed on the weld crown when

.possible, and directed parallel to the weld. Scanning shall be performed in both directions along the weld.

4.5.4 For longitudinal weld seams adjacent to circumferential welds the entire weld length shall be examined during O preservice examination. For inservice examination, only the first 1 foot of the weld for Class 1 and 2-1/2 T for Class 2, need be examined. All other welds shall be examined for their full length.

4.5.5 The angle beam coverage for examination of reflectors O parallel to the weld using the 1/2 "V" path examination technique shall be sufficient to permit the sound beam to cover the inner 1/3 T of the weld and at least 1/4 inch of the adjacent base material on both sides of the weld edge.

Manipulation of the search unit over the weld crown may be required to achieve this coverage using the 1/2 "V" examination technique.

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4.5.6 For the 1-1/2 "V" path technique, the minimum coverage shall be in accordance with the chart below and in all cases shall be sufficient to cover the lower 1/3 of the weld and 1/4 inch of the base material adjacent to the

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_ Beam Required Scan Distance Measured from the Angle Weld Centerline - Pipe Thickness is "T" 45 At least 3-1/2 T

.O 60 At least 5 T 4.5.7 The manual scanning rate shall not exceed 6.0 inches per second. Each pass of the search unit shall overlap a minimum of 10% of the transducer piezoelectric element dimension perpendicular to the direction of scan.

iO 4.6 Scanning Sensitivity - For angle beam examination, scanning shall be performed at a minimum of 2X (6 dB) above the primary reference level . Six dB increases the signal amplitude by a factor of approximately 2, making the primary reference curve a 50% DAC curve. Recording of indications requires the signal to be adjusted

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O QCI 6-13 Rev. 3

<3 to the point where it is equal to the DAC curve using the dB control. Signal amplitude can then be determined from the following chart using the observed change in the dB control. j dB Gain - % DAC dB Gain - % DAC 0- 100 0 - 100 C)

-1 - 112 +1 -

90

-2 - 125 +2 - 80

-3 - 141 +3 -

70

-4 - 159 +4 - 63

-5 - 178 +5 -

56

-6 - 200 +6 -

50 C) -7 - 224 +7 -

45

-9 - 282 +8 -

36 316 +9 -

32 355 +10 - 28 400 +12 - 25 447 +13 - 22 C) 501 +14 - 20 562 +15 - 18 631 +16 - 16 708 +17 - 14 794 +18 - 13 891 +19 - 11

,C) 1000 +20 - 10 4.7 We ld Thickness Measurement - Thickness measurements may be taken at or near the O degree reference point and at 90 degree intervals around each weld on which a data plot is performed. The measure- ,

ments will be made on:

O (a) The weld centerifne; (b) In the heat affected zone as near as possible to each edge of the weld; and

() (c) On the base material on each side of the weld.

4.7.1 In addition, the location of the pipe counterbore transi-tion should be determined when possible and the distance from the weld centerline documented on the Examination Data Sheet.

iC) 4.7.2 All measurements shall be documented on the appropriate l

1 area of the Examination Data Sheet shown in Attachment 7.1.

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O QCI 6-13 Rev. 3

[ 4.8 Data Recording for Straight Beam Examination - If the response

O rrom tne iaminar rerlector exceeds the remaining back reflection response in an area exceeding 3/4" in its longest dimension, the following data shall be recorded on the Examination Data Sheet.

(a) Indication Number - Assign a number, beginning with 1, to each individual indication which is recorded.

iO (b) Location Interval - Record the search unit location interval with respect to the stamped degree location numbers on the weld.

I (c) Beam Angle - Record the search unit beam angle (0*).

lO (d) Scan Surface - Record the surface (1 or 2) on which the .

search unit is being applied. See Attachment 7.3.

(e) Sound Path - Record the sound path distance to the reflector.

10 (f) Length - Record the major dimension of the reflector in the 100% DAC length column.

3 (g) Prepare a sketch showing the area in which the reflector exceeds the remaining back reflection and attach it to the Examination Data Sheet.

4.9 Data Recording for Angle Beam Examination - If the maximum signal amplitude equals or exceeds 507, of the primary reference level, the following data shall be recorded on the Examination Data Sheet.

(a) Indication Number - Assign a number, beginning with 1, to lO each individual indication which is recorded on each weld. -

i (b) Location Interval - Record the search unit location interval with respect to the stamped degree location numbers on the weld.

O (c) Beam Angle - Record the search unit beam angle, typically 45' or 60'.

(d) Scan Surface - Record the surface (1 or 2) on which the search unit is being applied. See Attachment 7.3.

O (e) Beam Direction - Beam direction documents the search unit orientation with respect to the weld. Beam direction will be A, B, C or D. See Attachment 7.4.

(f) Sound Path - Record the sound path distance to the indica-tion at the peak amplitude location.

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g (g) Extent - This information, recorded in degrees, is used to describe the extent of intermittent or continuous geometric indications. If a more thorough description is required, this blank may be used to reference the notes section.

(h) Dampable - If an indication is dampabic on the surface of the part, it should be stated in this column.

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(i) Amplitude - Record the maximum amplitude of the signal as a percentage of the primary reference level.

(j ) Length - Record the 50% to 50% and 100% to 100% DAC length of each indication.

(k) Search Unit Position - Record, in inches, the distance (L) from the search unit to the smaller stamped location number and the distance from the exit point to the weld center-line (W) for longitudinally oriented indications or the distance from the search unit centerline to the weld O centerline (W) for transversely oriented indications.

These measurements shall be taken at the maximum amplitude location. See Attachment 7.5.

(1 ) Through Wall Dimension - If the maximum signal amplitude equals or exceeds 100% DAC, record the minimum and maximum lf) sound path distance and search unit location as the search 1 unit is moved toward and away from the reflector. These measurements shall be taken at the 100% DAC level. The minimum and maximum sound path readings may not necessarily be at the point of maximum signal amplitude, nor do they have to be on the same scan line. Each indication shall

0 be fully investigated to determine the points at which the minimum and maximum readings occur.

4.10 Examination Records 4.10.1 A Calibration Data Sheet (Attachment 7.2) shall be O prepared for each calibration.

4.10.2 An Examination Data Sheet shall be prepared for each weld examined and shall be related, by number, to a Calibration i

Data Sheet.

O 5.0 EVALUATION 5.1 All indications detected in the area of interest which produce signal amplitudes greater than 100% of the DAC reference level shall be individually reported and an evaluation made in accordance with Paragraph IWB-3514 of ASME Section XI,1980 Edition Winter g 1980 Addenda (Reference 6.1.1).

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O s QCI 6-13 Rev. 3 l' 5.2 Any area where complete examination cannot be performed due to

< C) obstructions, configuration of weld, etc., shall be recorded and reported. .

5.3 All data shall be submitted to the Supply System UT Level III for review. The Level III shall. evaluate the examination data and indicate the status of the indication in the Evaluation column of

. C) the Ultrasonic Examination Data Sheet. The Level III shall also ccmplete the Data Evaluation Form in accordance with NDESI

, Instruction 12-8.

6.0 REFERENCES

! C) 6.1 American Society of Mechanical Engineers Boiler and Pressure Yessel Code,1980 Edition through Winter 1980 Addenda.

6.1.1 Section XI " Rules for Inservice Inspection of Nuclear Power Plant Components".

c) 6.2 The Supply System " Program Manual for Qualification and Certifica-tion of Examination, Testing and Inspection Personnel WMC-034".

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7.0 ATTACHMENTS 7.1 Examination Data Sheet

( 7.2 Calibration Data Sheet 7.3 Examination Surfaces 7.4 Beam Directions i C) 1.5 Search Unit Location and Orientation

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