ML20212A013
| ML20212A013 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 12/10/1986 |
| From: | Hunsader S COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 2499K, NUDOCS 8612220251 | |
| Download: ML20212A013 (32) | |
Text
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s s ConMnonwealth h
., One First Nabonal Plaza. Chca00, lHinois
/ Address Reply to: Post Omce Box 767 (h / Chicago, lHinois 60890 - 0767 December 10, 1986 Mr. Harold R.
Denton U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, DC. 20555
Subject:
Braidwood Station Unit #2 Reactor Vessel Nozzle Analysis NRC Docket No. 50-457
Reference:
(a)
April 2, 1986 A.D. Miosi letter to H.R. Denton (b)
August 1, 1986 A.D. Miosi letter to H.R. Denton
Dear Mr. Denton:
Reference (a) provided the ASME Code Evaluation of the Braidwood Unit 2 Reactor Pressure Vessel Inlet Nozzle "F"
dated February 28, 1986.
Reference (b) provided supplemental information with respect to reference (a).
On November 22, 1986 an ultrasonic (UT) examination was performed to identify the location of the indication so that the grindout could be performed as discussed in reference (a).
The results of the UT examination shows that the indication has a size and location different than that originally found via the original j
Combustion Engineering in-vessel UT examination.
The new data demonstrates that the indication size meets ASME Section XI IWB-3512, 1977 Edition up to and including the Summer 1978 Addenda.
As a result, the need to perform an indication grindout as presented in reference (a) is no longer necessary.
Also no weld repair is considered to be necessary.
Attachment A provides specific details of what was found during the November 22, 1986 UT examination and the evaluation of the examination results.
As a part of the Braidwood Inservice Inspection (ISI)
Program the indication size will be monitored via the in-vessel tool examination method.
If any measurable increase in the size of the indication is identified by this method, a subsequent manual UT examination shall be performed from the outside surface.
The examination results shall be compared to the present manual UT results to define the extent of change in the size of the indication.
8612220251 861210 DR ADOCK 05000457 (hCC PDR
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. This information was discussed with members of your staff on November 24 and 25, 1986 and is being provided for your review and acceptance.
One signed original and fifteen copies of this letter and the attachments are provided for your review.
Very truly yours, S.
C. Hunsader Nuclear Licensing Administrator
/klj cc:
J.
Stevens 2499K 4
6 i
ATTACHMENT A COMMONWEALTH EDISON SYSTEM MATERIALS ANALYSIS DEPARTMENT REPORT ON UT INDICATION DETECTED IN A NOZZLE TO VESSEL WELD AT BRAIDWOOD UNIT 2 In September 1984, Combustion Engineering (CE) performed a pre-service inspection (PSI) ultrasonic (UT) examination of the Braidwood Unit 2 reactor pressure vessel (RPV) welds.
An in-vessel tool was used to perform the UT examination from inside the reactor vessel.
This examination revealed an indication on the nozzle side of inlet nozzle toward the vessel shell weld WR-19 (CE area designation #02-RV-011).
The size of the indication at that time was reported as 0.79 inch in length (1) and 0.73 inch in width (a).
Based on the L-wave UT examination performed from inside the nozzle, Combustion Engineering plotted the indication as being very close to the O.D.
surface.
At that time the indication was found to be unacceptable per ASME Section XI, 1977 Edition thru summer 1978 addenda.
(Combustion Engineering's Summary Report is presented as
- .)
At the same time Commonwealth Edison (CECO) NDE personnel performed a magnetic particle examination of the outside surface of the nozzle to the vessel weld and no indication was found.
It was concluded that the defect as identified by CE was close to, but had not penetrated the outside surface of the nozzle.
Also the original construction radiographs of this weld had been rettieved and reviewed by CECO's NDE personnel, and the NRC Region III inspector.
A slag type defect, approximately O.75 inch long, was noted.
(The RPV manufacturer had listed the defect as being 5/8 inch long and that it did not require a repair.)
i In March 1985, a conference call was made to the NRC to l
discuss CECO's plans to excavate the defect and provide weld restoration of the resulting cavity.
The NRC position included that any weld restoration should be followed by a post-weld heat i
treatment.
Since there exist physical restraints which prohibit even a local post weld heat treatment, a " temper-bead" technique was proposed by Ceco.
The NRC expressed strong reservations about the use of the " temper-bead" technique due to concerns that the toughness in the weld repaired area would be affected.
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Commonwealth Edison decided to evaluate the effect of an un-restored excavation on the structural integrity of the RPV i
nozzla.
A detailed ASME Section III evaluation was performed by General Electric Co. using finite element stress analysis methods.
This evaluation showed that an excavation 3 inches long by 1 inch deep (a 3:1 taper) was acceptable to remove the defect without welding.
The report of the the analysis was submitted to the NRC via submittals dated April 2, 1986 and August 1, 1986 and the results were discussed during subsequent conference calls.
In mid-November, 1986, plans were made to remove the defect by mechanical means.
At that time, a Commonwealth Edison inspector performed a UT examination, from the O.D.
surface, to locate the defect.
It was discovered that the defect was not close to the outside surface, but is located about 1.25 inches below the surface.
(The Commonwealth Edison UT examination report and the UT procedure are included as Attachment 2.)
The following summarizes the results of the UT examination:
450 shear wave test ----
Length = 0.6" Depth (thruwall) = 0.6" 600 shear wave test ----
Length = 0.95" Depth (thruwall) = 0.4" Average length 0.8" Average depth 0.5" The defect lies at an angle, and the projected depth on a true radial-axial plane is 0.25" (2a).
a/l = 0.1 and a/t = 1.3%
Per the acceptance criteria in ASME Section XI IWB-3512, j
1977 Edition, up to and including the 1978 addenda for a/l = 0.1 an j
acceptable a/t = 2.6%.
As can be seen the RPV indication meets the acceptance criteria of ASME Section XI.
Based on this latest UT data, the indication is acceptable as is and need not be repaired.
Evaluation:
It appears that the original Combustion Engineering examination performed from inside the nozzle (12.5 inch metal path) had placed the indication closer to the surface than it j
actually is.
The geometry of the nozzle on the outside surface and the 12.5 inch metal path that the sound had to travel through could have resulted in a slight error in the distance measurement for the defect location.
Also, the thru-wall dimension of 0.73 inch
. reported in the Combustion Engineering test, may have been due to an i
i t
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l f oversizing effect which has been known to occur in heavy wall pressure vessels.
(The results of the Byron Units 1 and 2 and Braidwood Unit 1 steam generator weld examinations have demonstrated oversizing of indications by a factor of at least 2.)
Recommendation:
In general, future in-service inspection (ISI) is to be performed using the in-vessel tool examination method.
The CE PSI data provides a data base for comparison with the exception that this particular defect should be evaluated as subsurface defect (1.25 inch below surface).
A correlation has been made between the inside diameter and outside diameter examination results.
If any measurable increase in the size of the defect is noted it shall be confirmed by manual examination from the outside surface and a thorough evaluation shall be made of these examination results.
2499K l
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ATTACHMENT 1 COMBUSTION ENGINEERING
SUMMARY
REPORT Braidwood Unit-2 RPV Inlet Nozzle "F"
(Loop #2 Weld #02-RV_011) e m
9 m
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SYSTEMS. '4;;':
Data Shet t No. 7684-I S I OGY.23
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,f ULTRASONIC' EXAMINATION EVALUATION SHEET FOR REPORTABLE INDICATIONS
<.g Supplement B Wald Nunter 02-Rv-c/e Indication Number (s) 8-/
Applicable ASME Code Standards used for evaluation:
Section n'.: 5 - - 9a - M -4.. d ' " ",. m.>-
Article J A 4I 3 5'd o in.,....,.....
s.,m m u on Size of Indic,ation:
Length e. 7e " = }
Depth ~ 0o s. der (no d.,lemable '.s "direws;....)
Width
- 0. 7 x e e.-
Plate Thickness (t)
- e. s 9 f.,,,14 Characterization of Flaw Indication per Para.
J~w d - 3 ro "//.e r
Type of Flaw:
Sur k e /La,a e
Sketch of Indicati,gn:
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to actual flaw size:
acceptable rejectable
- EXAMINER T...
b; LEVEL 1 DATE 9-27'ef REVIEWER
//A-LEVEL N A DATE NA APPROVAL M I, O -/
LEVEL III DATE f/A ?/ge/
AUTHORI hD INSPECTOR d b avr DATE 4-MB//
- If a rejectable indication is found during an
- mination, additional evaluation analysis snail be performed.
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ATTACHMENT 2 COMMONWEALTH EDISON UT DATA & PROCEDURE Braidwood Unit-2 RPV Inlet Nozzle "F"
(Loop #2, Weld #02-RV-011)
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RWVP 190g.17 RevistE3 0 Procedure No3WVP-1900-6 toy, i Case _ Aug. 1, TgT$
PROCEDUtt C:PTIFICAt!0W 9
Ultrasonic examination of full penetration Class 1 and Procedure title:
Class 2 vessel welds in ferrite material greater than r
2 inches in thic't. ness This is to certify that the above titled procedure is it. compliance with the requirements of the A#15 Soller and Pressure Vessel Code.
1977_ Edition.
Summer 1978 Addenda. Seation (s)
XI This procedure has been reviewed, witnessed and approved by fYY n
~
31gnatup6 of SWT-TC-1A 1.evel III, Date
~
NM GA 7 7-U I
u 7 --
v Date Authorised Q. A. Dept. Signature I. the undersigned. of the MAAT*fo4b 6 TEW f Son 44 j r/.sd.
% JNJ. C 3-holding a valid certificate issued by the National Board of Boiler and Pressure Vessel Inspectors and/or the state of Illinois. have reviewed the above peccedure and flad it acceptable.
IA/ Lb' %
0-N 6 lel Y $. ) L L, (e l7.-
$# y "h e $5 y\\tte u
Signature of Authorised Inspector & No.
(Final) k JUL 18G84 1
N.',M.P.?.
1,43, 0302A
~
R1 vision 1 ULTRASONIC MANUAL EXAMINATION OF CLASS 1 AND 2 VESSEL WELDS A.
SCOPE
~
A.1 This procedure describes the manual, contaci., ultrascr.ic -
examination of full penetration class 1 and Class 2 vessel welds in ferritic material greater than 2 inches in thickness.
A.2 This procedure is in accordance with the requirements of ASME Boiler and Pressure Vessel Code Section XI, 1977 up to and including Summer 1978.
A.3 Weld inspections covered by this procedure are listed in Section XI categories B-B and C-A.
B.
APPLICABLE DOCUMENTS AND CODES B.1 The following documents form a part of this procedure to the extent specified herein.
B.l.1 ASME Section XI 1977 edition up to and including Summer 1978 addenda.
B.1.2 ASME Section V 1977 edition up to and including Summer 1978 addenda.
B'l.3' SNT-TC-1A 1975 edition of the American Society for Nondestructive Testing.
C.
GENERAL REOUIREMENTS C.1 Flaw Detector C.1.1 A pulse-echo type of ultrasonic instrument (Nortec 131 or equivalent).shall be used for this examination.
C.l.2 This 'nstrument shall be equipped with a stepped 4
gain control calibrated in units of 2dB or less.
c.
C.l.3 The electronic performance characteristics of the s
instrument shall be verified at least once a year.
This, calibration shall be traceable to national
(
standards and a report of this calibration shall be.
kept on file.
.w C.2 Sea #rch Units I
c.2.1 Transducers shall be 2.25 MHZ nominal frequency at beam angles of O' (longitudinal) 45' and 60.'
(transvense). Other transducers may be used for l
investigations and where metallurgical characterristics c geometry preclude the above standard angles.
I l
1 l
0362o i
E W-~1SuwFO Rsvision 1 C.2.2 The angle beam wedges shall be within i 3* of nominal value. This shall be checked on a standard
!c reference) Lack such as an IIW.
Transduca#its shall be a maximum of one square inch 7."
C.2.3 D
active W ea and generally be the shear wave mode forangpbeamexamination.
C.3 Personnel C.3.1 All personnel performing and evaluating the results (when required) shall be certified to at least Level II UT.
C.3.2 Level I UT personnel may be used to perform the longitudinal wave examination under the direction of Level II personnel.
C.3.3 personnel reviewing data and calibration forms for completeness and adherence to procedure need not be certified to Level II.
C.3.4 Personnel performing examinations shall be certified in accordance with SNT-TC-1A,1975 edition.
C.4 Couplant
~
C.4.1 Glycerine is~ normally used as a couplant.,
All
^
Alternate approved couplants may also be used.
couplants used must have a certified analysis of halogen content of less than 300 ppe.
C.5 Calibration Blocks C.5.1 Calibration blocks shall be in accordance with T-434 of ASME Section V, Article 4.
C.5.2 surface finish of blocks shall be representative of surface finish of examination scan surfaces.
C.5.3 The temperature difference between the examination and calibration block surfaces shall not exceed
-25'F.
C.6 Examination Requirements C.6.1 The volume shall be examined by moving the search unit over the examination surface so as to scan the entire examination volume. As a minimum, each pass j
- l of the search unit shall overlap a minimum of 10%
i of the transducer dimension perpendicular to the direction of the scan.
2 0362o
BWP 1900-6 Rzvision 1 C.6.2 The rate of search unit shall not exceed 6 in/sec unless calibration is verified at scanning speed.
'C.6.3 Scanning shall be performed at a gain setting at least two times the reference level. Recording of indications shall be carried out with.the gain setting at the reference level.
C.6.4 The component surface shall be free from any roughness that would interfere with free movement of the search unit or imr air the transmission of ultrasound.
D.
CALIBRATION D.1 General D.I.1 Complete ultrasonic examination system calibration, establishing the DAC shall be performed prior to each series of similar examination.
D.1.2 In case of angle beam, the maximum calibration indications shall be obtained with the sound beam oriented essenticily perpendicular to the axis of the calibration reflector.
D.1.3 The centerline'of ths
.Tch unit shall be at least
~
1-1/2 in. from the nearest side of the block.
D.1.4 Calibration shall include the complete ultrasonic examination system. Any change in search units, shoes, couplants, cables, ultrasonic instruments, recording devices, or any other parts of the examination system shall be cause for a calibration check. The original calibration shall be performed on the basic calibration block and calibration checks shall be performed as per D.2.1.
D.I.5 The following data shall be recorded on calibration
]
data, Form BWF 1900-1T1:
D.1.5.a calibration sheet identification and date of calibration; e,
D.1.5.b names of examination personnel; D.l.5.c examination procedure number and revision; D.l.5.d basic calibration block identification and temperature; D.l.5.e ultrasonic instrument identification and
)
serial number; l
3 0362o
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Rsvision 1 D.l.5.f beam angle, couplant, and mode of wave l
propagation in the material; D.1.5.g orientation of search unit with respect to the pipe (longitudinal or circumferential);.
D.l.5.h search unit identification - frequency, size, and Manufacturer's serial number:
D.l.5.1 special search units, wedges, shoe type, or saddle's identification, if used:
D.l.5.j search unit cable type and length; D.1.5.k times of 111tial calibration and subsequent calibration checks; D.1.5.1 amplitudes and sweep readings obtained from the calibration reflectors.
D.2 Calibration Check D.2.1 A system calibration check, which is the verification of the instrument sensitivity and sweep rar.ge calibration, shall be performed at the start and finish of each examination or series of similar examinations,'with any change in examination personnel, and at leas.t every 4 houra during an examination. Calibration checks may be performed on either the block used for initial calibration, or a simulator block.
D.3 Corrective Action D.3.1 If any point on the DAC curve has decreased 20 percent or 2dB of its amplitude, all data sheets since the last calibration check shall be marked void.
A new calibration shall be made and recorded and the voided examination area shall be reexamined.
D.3.2 If any point on the DAC curve has increased more than 20 percent or 2dB of its amplitude, recorded indications taken since the last valid calibration or calibration check may be reexamined with the corrective calibration and that value changed on the data sheets.
4 1
1 4
0362o n-.,,._,.,,m----...,-,,--
ym,,
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Rsvision 1 J
D.3.3 If Eny point on the DAC curva his moved on tha sweep line more than 10 percent of the sweep division reading, correct the sweep range calibration and note the correction of the examination record. If recordable reflectors are noted on the data sheets, those data sheets shall be voided, a new calibration shall be recorded, and the examination voided areas shall be reexamined.
D.4 Instrument Linearity Verification D.4.1 Screen Height Linearity The ultrasonic instrument shall provide screen height linearity within 5% of full range for at least 80% of the full screen height (FSH) (base line to maximum calibrated screen points). The screen height linearity check shall be made in accordance with Appendix BWP-1A1 and the results recorded on Form BWP 1900-1T3.
D.4.2 Amplitude Control Linearity The ultrasonic instrument shall utilize an amplitude control, accurate over its useful range to 20% of the nominal amplitude ratio, to allow measurement of indications beyond-the linear range of the. vertical display.on the screen. The amplitude control linearity check shall be made in accordance with BWP 1900-1A1 and the results recorded on From BWP 1900-1T3.
D.4.3 Instrument calibration for screen height and amplitude control linearity shall be verified at 1
the beginning and end of the weld examinations performed during one outage or every three mor ths, 1
whichever is less.
D.5 Beam Spread Measurement D.5.1 Measurements of beam spread in the vertical plane of angle beam search units shall be performed at the beginning of each period of extended use.
D.5.2 Beam Spread Measurements for the vertical plane of each angle beam search unit and weld thickness combination shall be made using the locating strip as follows and as shown in Figure 10.
t l
D.5.2.a. Position search unit for maximum response from the 1/4T hole.
5 0362o
. ~
SWP 1900-6 Revicion 1 D.5.2.b Increase instrument sensitivity by 2x (6dB) over the reference sensitivity level and move the search unit toward the hole until signal amplitude is equal to the DAC curve drawn on the screen. Mark a small 1 on the Indication Location strip where it crosses the scribe line over the 1/4T hole.
D.5.2.c Move the search unit away from the 1/4T hole, through the maximum amplitude point, until the signal amplitude is again equal to P.he Dhc curve drawn on the screen.
Again, mark a small 1 on the Indication 7a;ation Strip.
D.5.2.d Repeat steps D.5.2.b and D.5.2.c for the 1/2T and 3/4T holes using small numbers 2 and 3 respectively.
D.5.2.e Determine the refracted beam angle of -
divergence fot 50% DAC amplitude and record pertinent information on BWP 1900-1A1.
NOTE: Curvature of the Calibration Standard may cause rose deviation
~
in beam spread and beam angle information.
D.5.2.f Beam spread plots shall become part of the examination record.
i
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i Figure 10 6
1842P
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R1 vision 1 E.
STRAIGHT BEAM SCANNING E.1 For Laminar Reflectors When scanning for laminar reflectors, two examinations are performed simultaneously with the same calibration described below in E.1.1.
However, the examination volume and acceptance criteria differ as referenced in E.1.2 and F.1 fespectively.
E.1.1 Calibration: using the 1/4 t and 3/4 t side-drilled holes, establish the sweep range calibration by positioning the hole responses at the 2nd and 6th major horizontal screen divisions respectively. Also, verif, that the response from the 1/2 t holes is at the 4th torizontel division on the screen.
For weld', where cswent thickness is greater than calibration block tlockness (e.g.
pressurizer) a 5" full screen range, cilibrated to an IIW-2 or equivalent Block, shall be used. Next, place the search unit on the component mder examination. Adjust the sensitivity so that the
~
response from the initial back reflectim is at 69 percent (i 5 percent FSH). This is the reference sensitivity used for examination.
M
~
WHEN THE EXAMINATION IS PERFORMED FROM THE TAPERED SURFACE AT A TRANSITION IN THICKNESS OF THE COMPONENT, ANGLE BEAM LONGITUDINAL WAVES TRAVELING ESSENTIALLY PERPENDICULAR TO THE BACK SURFACE MAY BE USED TO MAINTAIN THE BACK REFLECTION.
E.1.2 Examination: Examination shall cover the following:
(a) The entire examination volume as indicated in Fig. 4 to 9 M
THIS EXAMINATION IS INTENDED FOR RECORDING LAMINAR REFLECTORS FOR ACCEPTANCE.
(b) The base material through which angle beam will travel during angle beam examination.
NOTE THIS EXAMINATION IS INTENDED FOR RECORDING LAMINAR REFLECTORS WHICH MIGHT AFFECT THE INTERPRETATION OF ANGLE BEAM RESULTS.
- 1 0362o l
Rtvision 1 E.2 For planar Reflectors E.2.1 Calibration: Using the 1/4 t and 3/4 t side drilled holes, establish the sweep range calibration by positioning the hole responses at the 2nd and 6th major horizontal sc'een divisions respectively. Also, verify that the response from
)
the 1/2 t hole is at the 4th longitudinal division i
on the screen. For welds where component thickness is greater than calibration block thickness (e.g.
pressurizer) a 5" full screen range, calibrated to an IIW-2 or equivalent block, shall be used. The DAC shall be established using the 1/4, 1/2 and 3/4 t holes so that the maxism amplitude point is at 80 percent FSH. Mark the location and amplitude on the screen. Without adjusting the instrument controls maximize responses from the remaining holes and mark the amplitudes and locations on the screen. Connect the maxim a amplitude points with a smooth curve and extrapolate this curve to cover the full examination range. This curve is the primary reference level and recording of ultrasonic reflectors shall be performed at this sensitivity (see Figure 1 for typical DAC).
E.2.2 Examination: The examination shall cover the entire examination volume as indicated in Fig. 4 to 9.
penetration shall be verified by obtaining a reflection from the opposite surface of the material being examined when the two surfaces are parallel.
E.3 ANGLE BEAM SCANNING E.3.1 Calibration Using the 1/4 t and 3/4 t side drilled holes, establish the sweep range calibration by positioning the hole responses at the 2nd and 6th major horizontal screen division respectively.
I Also, verify that the response from the 1/2 t hole l
is at the 4th horizontal division on the screen.
I For welds where component thickness is greater than calibration block thickness (e.g. pressurizer) a 10" full screen range, calibrated to an IIV-2 or equivalent block shall be used. The DAC shall be established using the 1/4, 1/2 and 3/4 t holes so that the maximum amplitude point is at 80 percent FSH. Mark the location and amplitude on the i
screen. Without changing the instrument controls maximize responses from the remaining holes and j
mark the amplitudes and locations on the screen.
l Connect the maximum asplitude points with a smooth curve and extrapolate this curve to cover the full 8
0362o l
cxamination rcnga. This curva is tha primary reference level and recording of ultrasonic reflectors shall be performed at this sensitivity (see Figure 2).
E.3.2 Calibration Correction The-45' angle beam shear wave reflects well from a corner reflector.
However, mode conversion and redirection occurs to part of beam when a 60* angle beam shear wave hits the same reflector. This problem also exists to a lesser degree throughout the 50' to 70* angle beam shear wave range. This correction is required in order to be equally critical of such an imperfection regardless of the examination beam angle:
(a) Using the same sensitivity established above, position the search unit for maximum amplitude from the square notch on the opposite surface.
"X" marks the peak of _the indication on the screen near sweep line 8.
(Figure 2)
(b) The opposite surface square notch may give an-i indication 2 to 1 above DAC at 45' and 1/2 DAC at 60'.
The square notch in the examination surface will give a low amplitude if detected. Therefore, the indication-from the square notch must be considered when evaluating reflectors at the top or bottom surface.
(see Figure 3A.)
l E.3.3 Position Calibration: Position calibration may be i
used as an aid in locating reflectors and need only be performed for evaluation of indications. The following measurements may be made with a ruler, i
scale or marked on an indexing. strip.
(a) Position the search unit for maximum response from the 1/4 hole. Place one end of the indexing strip against the front of the search unit the other end extending in the direction l
of the beam. Mark the number 2 on the indexing strip at the scribe line which is l
directly above the hole.
(If the search unit I
covers the scribe line the marks may be made j
on the side of the rearch unit.)
(Figure 2)
(b) Position the search unit for maximum indications from the 1/2 and 3/4 t holes.
Keep the same end of the indexing strip against the front of the search unit. Mark numbers 4 and 6 on the indexing strip at the scribe line.
i i'
s i
9 l
0362o
m 1
R2 Vision 1 (c)
If possible, position the search unit so that the beam bounces from the opposite surface to j
the 3/4 hole. Mark the number 10 on the indexing strip at the scribe line.
(d) Position the search unit for the maximum opposite surface notch indication. Mark the number 8 on the indexing strip at the scribe line.
(e) The calibration numbers on the indexing strip indicate the position directly over the reflector in sixteenths of the Vee-path.
(f) The depth from the examination surface to the reflector is T at 8, 3/4 T at 6 and 10, 1/T at 4, 1/4 T at 2, and 0 at O.
Interpolation is possible for smaller increments of depth.
This measurement may be corrected by the radius of the hole if the radius is considered significant to the accuracy of reflector's location.
!E!IE FIGURE 3 GIVES AN EXAMPLE OF ABOVE MEASUREMENTS.
E.3.4 Exa;ninetion The examination volume shall be scanned with angle beam search unit directed both at right angles to the weld axis and along the weld axis. Wherever feasible, each examination shall be performed in two directions, ie, approaching the weld from opposite directions and parallel to the weld from opposite directions. These examinations shall be conducted using two beam angles (nominals angles of 45 and 60 degrees) from each direction.
The extent of scanning shall be such that ultrasonic beam passes through the entire examination volume as indicated in Fig. 4 to 9.
F.
RECORDING EXAMINATION DATA F.1 Straight Beam Data for Laminar Reflectors F.1.1 For Interference with Angle Beam Examination:
Record all areas which produce indications equal to or greater than the remaining back reflection.
F.1.2 For Acceptance: Record all areas where one or more discontinuities produce a continuous total loss of back reflection accompanied by continuous indications in the same plane.
10 0362o
e Rivision 1 e
F.1.3 Data Required: The following data shall be recorded: Sweep reading of laminar reflectors from surface, position from reference line, and location parallel to the reference line for each search unit position civing the recordable extent of the indication, as the " laminar" area is scanned on parallel scan paths.
F.2 Straight and Anale Beam Data for Planar Reflectors F.2.1 Scope of Recording: Record all reflectors which produce responses as referenced in F.2.2 except for the following:
(a) Geometric Reflectors: Clad interface and back wall reflections need not be recorded.
(b) surface Reflectors: Record surface reflectors that produce a response equal to or exceeding 4
the reference amplitude established from appropriate surface notch in the calibration block (referenced in E.3.2 of this procedure).
F.2.2 Reflectors Eaual to or Raceeding 50 Percent DAC:
For each indication that equals or exceeds 50 percent of the reference level the following information shall be recorded:
~
(a) Maximum' percent of DAC, sweep reading of indication, search unit position, location along the length of the weld, and beam direction.
(b) Through-Wall Dimension i
(1)
For reflectors 50 to 100 percent DAC, the
, minimum sweep reading and its position and location along the length of the 3
reflector for 50 percent DAC when j
approaching the reflector from the maximum signal direction.
i (2)
For reflectors 50 to 100 percent DAC, the maximum sweep reading and i'ts position
]
and location along the length of the reflector for 50 percent DAC when moving away from the reflector's maximum signal direction.
(3)
For reflectors exceeding 100 percent DAC, 1
minimum sweep reading and its position and location along the length of the i
reflector for 50 percent of the maximum amplitude when approaching the reflector from th maximum signal direction.
11 p!
0362o
m RIvision 1 (4)
For reflectors excseding 100 P9tcant DAC, maximum sweep reading and its position and location along the length of the reflector for 50 percent of the maximua amplitude when moving away from the reflector's maximum signal direction.
(c) Length Dimension: The length of the reflector shall be obtained bf recording the position and location along the length of weld as determined by 50 percent of DAC for each end of the reflector.
(d) Record all search unit position and location dimensions to the nearest tenth of an inch and obtain data from each successive scan path.
F.2.2 Further Evalua'1gn,1 Further evaluation of reportable indications to
~
determine disposition and/or the need to make repairs shall be the responsibility of the PSI Coordinator.
G.
REPORTS G.1 A, detailed ultrasonic-examination report shall be prepared using the reccannended report form provided at the end of this procedure and any additional sketches or photographs a.t-may be applicable.
If no reportable indications are _
detected it shall be so noted on the report form.
l G.2 Prompt notification of reportable indications shall be made to the PSI Coordinctor.
G.3 Data shall be entered, as required for each item in the blank space provided r,n the calibration data sheet, and if used, on the indicat.on data sheet. Where data is not germane for the spot.ific item the blank space shall be marked N/A to ind.icate that date, is not applicable.
(Final) 12 0362o u.
-