ML19332F319

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Package of Repts & Notes Re Plant,Including Deficiency Rept, Nonconformance Rept,Handwritten Notes & QA Instructions
ML19332F319
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 12/05/1989
From:
NRC
To:
Shared Package
ML19332F316 List:
References
FOIA-89-428 NUDOCS 8912140261
Download: ML19332F319 (54)
v • d • e


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Iy C A $ J-C4 Cii. l:y { Ri v.i + NCR-89-04023 Rev.,1 Disposition Details Accept-As-Is r The weld joints identified in the conditions / details section of this NCR-89-04033 rev.1 are to be dispositioned a based on the following technical justification. necept.as isa TECHNICAL JUSTIFICATIONI The fuel transfer tube penetration sleeve enhedded in the requirements of A8HE III Class MC Artio16e R2-20 NZ-5000, thus the sleeve meets these material, fabrication and installation, and examination requirements. 1 The containment liner is not code stamped document, thus the s,leeve, which is a continuation of t is not' code sta p d me. The fuel transfer tube bellove assemblies are desiq

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[DeficiencyreportDR-C-48-02376 04033 document that the 11 and nonconformanes report NCR-el. \\ h<f dyr).ng_cspAttto_t.ienlitgol d penetrant a**=inatbnsJ th@tI Clase MC ormed D requiramants that the o roumferential IEitt vet 4'j nt b /e) radiographically examined. NCR-89-04023 rev. O re ired the circuatorential butt joints to ba radiographed. The b that the velds are tial ,h4as discussed below, demon >trated - k ogra Yes%%' roe $tinuities recorded by the radiographpene T Thdisce / s identified by this NCR-89-04023 are those typically found in the veld without back gouco ahd roweld, as shown on page 3 3 (page a land in$ of thls NCR). That is, a partial penetration veld has slag, lack of fusion when baOX gouge And reVeld iS n g'*. i f. lack of penetration, and other types of discontinuities. ,*y~ A review of the radiographs performad par rev. O of this Mct and the liquid penetrant examination report, contained in the traveler package for these velds l (slag, lack of fusion, la,ck of penetrationindicate that the RT discontinuities l etc. the land arent i.e. the LP examinations of,the ro)oare isolated to veld found no discontinuities. {. [g I Q. ) e I .evn.- e .n,.,,.. -,,-,-,.,,..e--.. rn, ,-n,-,--,_

MK ? -f-D-.0, 4... weide with d:phs demonstrate that the veld ( N b o _. 'm n radiogra i W .scontinuities at the root. 1002 rev. O conservatively damonstrates that thet are fu when treated as a partial p natratlon, veld, ji.e the veld is adequate discontinuities is ignored. @,jw, he,pyh pg 4,. area of the m Additional evidance of the adaquacy of the velds is yA ) parformance of the rainforced acceptance tant (8AT)lding and liand the integrated leak r e y the conorate containmant /g/' p\\ sequent to the we e quid panatrant axkninatio(nIIJtr)

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,9 0 pressures of SU psig and 411 psig for the 8AT l (re-spectively. and the UJtt g 1i A licensing docu:: ant change raquant slaava to ballows asseably veld. document the partial pe will be lasued to int configuration for the Thus the ( rtinf existence o diT65[Etbu.tration--Weld -joint _Configul A j ities identified by the radibgraphs does not affect and the the structural andadequacy S, of the veld perform their intanded dispositioned on acospt ght functions.to Therefore the wa lenX ti asais basis. ~ i AV y ea tp - T / , o9 ff geI\\ 91 p 7-9@ (2.C l0 l ( \\g i

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,~ a... a... ~. !"!1UELECTRIC ,./ OFFICE MEMORANDUM 70s Chuck Hogg DATE: August 10, 1989 $UBJECTs Instruction NQI 3.09 - 0.02 Instruction NQI 3.09 - 0.02 deviates from ASME Section V, 1974 Edition, por,agraph T-535.1(c)(1) and T-535.2(e). Attachments 1 and 2 are technical justifications for these deviations as allowed by ASME, Section V,1974 Edition, Article 1, paragraph T-110(c). Engineering concurrence with the above deviations is requested. Ja 'Jo'hn T. Maxvell -l NDE Quality Control Manager JTM/ tsc l-l 1 l l f

r- - G TdDbocnt U.. t Detection of Discontinult ics Transverse to the Weld ASHE Section V, Article 5. T $35.2(c) 1974 Edition The subject paragraph of ASME Section V, Article 5 states that for the detection of discontinuities transverse to the veld "Two search units shall be placed on the contact surfaces adjacent to the veld, one on each side,- forming an angle of 45 degrees or less with the axis of the veld as-shown in Figure T-535(c). As an alternste, if the veld surface has been made sufficiently smooth, one search unit may be placed on the centerline of the veld with the beam directed along the veld to scan the entire depth and width of the veld." The following technical justification is of fered as to why TU Electric procedure NQI 3.09 - 0.02 does not contain the "Two Search Unit Technique" for detection of discontinuities transverse to the veld. (1) The "Two Search' Unit Technique" can only be applied when the base material contact surfaces adjacent to the veld are flat and level with each other. The flange side of the electrical penetration velds has a tapered surface in the range of 12' to 14'. Because of this taper, the search unit placed on the flange side of the veld would be prevented from properly trancmitting or receiving the ultrasonic energy. (2) The pipe side of the veld is thicker t.han flange side adjacent to the veld and there is a "lund" that extends from the veld centerline to approximately 3/8 inch toward the flange. This difference in thickness combined with the unfused " land" portion would prevent the ultrasonic beams from converging at a point near the veld centerline where transverse L indications eay occur. (3) It is impossible to manually maintain two rearch unit orientation, skew angle and position while scanning circumferentially. In order for the "Two Search Unit Technique" to be success ful, precise search unit skev angle, position laterally and longitudinally and equal scanning speed for each search unit is required. If any of these parameters are varied while scanning, flaws can be missed. i (4) If all of the scanning parameters mentioned in (3) above could be maintained, a flav that is slightly of f axis (greater or less than 90' to the weld) may easily be missed. (5) Subsequent codes applicable to the examination of velds have deleted any reference to the "Two Search Unit Technique" for detection of flave oriented transverse to the veld. i w

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. - ( 6 )' The single search unit-technique allowed by T 535.2(c) as an alternate method, h6( been included in paragraph 6.7;8.1 of NQt 3,09 - 0.02. If the veld crokm is not suffielently smooth to allow ex.mination along the veld center!!ne, then the ex.tnination vill be performed vith a sing!c scarch unit applied to the base material adjacent to -the veld with the ultrasonic beam directed tangentially to the veld. This technique is consistent with the technique which has been quellfled and demonstrated for'the detection of intergranular stress corrosion cracking _(ICSCC) in stainless steel piping systems. ddd. 44, Kel C. Codwin Southwest Research Institute Level III U.T. Technical Consultant for TU Electric .+-we-- w-- y

y Angic Bema Distance Amplitude Correction (DAC) Curvc 4 Calibration Required by NQI 3.09 - 0.02 + Thie autdect procedurc requires the 2/8, 6/8.nd 10/8 VEE-PATH positions for const ruct ing en.ngle be.m DAC curve f or ex.minet ton of the Elect rical Penetration Velds. The Ult ras onic requirements for the examination in ASME Section V Article 5. Paragraph - T-535.1(c)(1) states that "The are first point on the curve is obtained by placing the search unit as near as possible but not less than 3/8 node or 2 in., whichever is less, from the calibration hole.nd pos!Lioning for maximum r e s pon s e. " _The 10 - in. diameter, schedulo 80,.594 in. thick and the 12_ in, diameter, schedule 80,.688 in. thick electrical penetration velde vill be examined using a basic calibration block that is.75 in. thick. The 5 in. diameter, schedule 80,.375 in, thick penetration velde vill be examined using.a i basic calibration block.375 in, thick. Due to the configuration of the velds, the angle beam examination for reflectors parallel to the veld must be performed af ter the team is reflected from the inside surface back to the outside surface. Complete two directional coverage of the veld is obtained by scanning from both-the pipe and flange sides of the velds. Figures obtained with a 60' angle beam search unit. 1, 2 and 3 show the coverage thickness of the veld is thinner than the nominal pipe thickness. Note that the act In onder to properly examine the

velds, and detect and evaluate discontinuities, the angle beam DAC curve must be constructed such that the volume being examined is encompassed within the DAC curve.

A comparison of the metal path ranges of DAC curves utilizing the 2/8, 6/8, 10/8 and 6/8, 10/8, 14/8 VEE-PATB positions is shown in Figure 4. The DAC curve constructed from the 2/8, 6/8 and 10/8 VEE-PA'Til positions will encompass the examination area metal paths. Only partial coverage of the examination metal pathe'is obtained when the DAC curve is 10/8 and 14/8 VEE-PAT)! positions required by T-535.1(c)(1). constructed using the 6/8, In addition to providing. superior coverage of the examination area, a DAC curve consisting of the 2/8, 6/8 and 10/8 VEE-PATil positions requires a azaller screen _ distance. A smaller screen distance calibration vill enable the U.T. operator to record indication sietal paths more accurately. For

example, if the horizontal base line is divided into 50 small screen divisions and a linear screen distance calibration of 10 inches is established, each screen division represents.2 inch.

If a smaller screen distance such as a 5 inch distance were used, then each small screen division represents .1 inch and the operator can read indication metal paths to the nearest.1 inch. Theoretically, more instrument gain vould be required to adjust the amplitude of the signal from the 6/8 VEE-PATH than vould be required for the 2/8 VEE-PATH position. position to 757. of full screen he Bovever, the increased sensitivity of the 6/8,10/8 and 14/8 DAC curve occurs beyond the examination area metal paths and is therefore not appilcable to the areas being examined. The examination procedure, NQI 3.09 - 0.02, requires scanning at an increase in gain of +14dB or 5X sensitivity. This increase should more than offset the difference in gain between the 2/8 and 6/8 VEE-PATH positions.

i 1 ASME Codes containing ultrasonic examination criteria applicable to this type of weld have subsequently deleted the requirement to use the 3/8 VEE-PATH or 2 inch metal path for the primary r e f e r enec response. The J primary reference response is established using the reflector and VEE-PATH position producing the highest amplitude signal. The angle beam DAC curve calibration method specified in HQ1 3.09 - 0.02 provides a curve that encompasses the examination area, allows smaller screen distances which improves accuracy of reading metal paths, and permits - the comparison of weld discontinuitles to a code size reflector at distances less than the 3/8 VEE-PATH position or 2 inches. hYkh$4 foel C. Codwin Southwest Research Institute Ievel III U.T. Technical Consultant for TU Electric Attachments: Figures 1 through 4 L iI l l. l il

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SUBJECT:

Instruction NQI-3.09 - 0.02 i, Instruction NQI 3.09 - 0.02 deviates from ASME Section V, 1974 Edition, paragraph T-535.1(c)(1) and T-535.2(c). Attachments 1 and 2 are technical i justifications for these deviations as allowed by ASME, Section V, 1974 Edition, Article 1, paragraph T-110(c). Engineering concurrence with the above deviations is requested. t /sN ' John T. Maxwell NDE Quality Control Manager JTM/ tsc w a,, k, vom 4 am Exswen,, is Muaa ke<.e p u-G, pop w n ) m iss sc. d11 / }- r -f,- 7 [

Attcchment 1 Detection of Discontinuitics Transverse to the Wcld ASME Section V, Articic 5. T-535.2(e) 1974 Edition The-subject paragraph of ASME Section V, Article 5 states that for the detection of discontinuitics transverse to the wcld "Two scarch units shall be placed on the contact surfaces adjacent to the weld, one on each side, forming an angic of 45 degrees or Icss with the axis of the weld as shown in Figure T-535(c). As an alternate, if the wcld surface has been made sufficiently smooth, one scarch unit may be placed on the centerline of the wcld with the beam directed along the wcld to scan the entire depth and width of the veld." The following technical justification is offered as to why TU E1cetric procedure NQ1 3.09 - 0.02 does not contain the "Two Scarch Unit Technique" for detection of discontinuities transverse to the weld. (1).The "Two.Scarch Unit Technique" can only be applied when the base -material contact surfaces adjacent to the wcld are flat and Icvc1 with each other. The flange side of the cicctrical penetration welds has a tapered surface in the range of 12' to 14'. Because of this taper, the scarch unit placed on the flange side of the wcld would be prevented from properly transmitting or receiving the ultrasonic energy.- (2) The pipe side of the wcld is thicker than flange side adjacent to the weld and there is a " land" that extends from the wcld centerline to approximately 3/8 inch toward the flange. This difference in thickness combined with the unfused " land" portion would prevent the ultrasonic beams from converging at a point near the wcld centerline where transverse indications may occur. (3) It is impossibic to manually maintain two scarch unit orientation, skew angic and position while scanning circumferential1y. In order for the "Two Scarch Unit Technique" to be successful, precise scarch unit skew angle, position laterally and longitudinally and equal scanning speed for each scarch unit is required. If any of these parameters are varied while scanning, flaws can be missed. (4) If all of the scanning parameters mentioned in (3) above could be maintained,-a flaw that is slightly off axis (greater or less than 90' to the weld) may casily be missed. (5) Subsequent codes applicabic to the examination of welds have deleted any reference to the "Two Scarch Unit Technique" for detection of flaws oriented transverse to the weld.

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(6) The. single scarch unit technique 1 allowed by T-535.2(c) as an alternate method, has been included in paragraph 6.7.8.1 of NQI 3.09 - 0.02. If the weld crown is not sufficiently smooth.to allow examination 'along the wcld centerline, then the examination will be performed with a singic scarch unit _ applied to the base material adjacent to the wcld with the ultrasonic beam directed tangentially to the weld. This technique.la consistent with the technique which has been qua11fied and-demonstrated for the detcetion of intergranular stress corrosion cracking (IGSCC) in stainicas steel piping systems. 4 /6cl G. Codwin f Southwest Research Institute j Level III'U.T. l Technical Consultant for TU Electric i j i I s e ee-

t' Attechnent 2 Angic Beam Distance Amplitude Correction (DAC) Curve Calibration Required by NQI 3.09 - 0.02 The subject procedurc requires the 2/8, 6/8 and 10/8 VEE PATH positions for constructing an angle beam DAC curve for examination of the Electrical Penetration Welds. .The Ultrasonic requirements for the examination are in ASME_ Section V Article 5. Paragraph T-535.1(c)(1) states that "The first point on the curve is obtained by placing the search unit as near as possible but. not 1 css than 3/8 node or 2 in., whichever is less, from the calibration. hole. and positioning for maximum response." The 10 in. - diameter, schedule. 80,.594 In. thick and t.he 12 in, diameter, schedule 80, .688 in, thick electrical penetration welds will be examined using a basic calibration block that is.75 in, thick. The 5 in, diameter, schedule 80,.375 - in, thick penetration welds will be examined using a basic calibration b'.ock.375 in. thick. Due to the configuration of the welds,- the angle beam examination for reficctors parallel to the wcld must be performed after the beam is reflected from-the inside surface-back to the outside surface. Complete two directional. coverage of the weld ~1s obtained by scanning from both the pipe and flange sides of the welds. Figures 1, 2 and 3 show the coverage obtained with a 60' angic beam scarch unit. Note that the actual centerline thickness of the wcld is thinner than the nominal pipe thickness. In order to properly examine the

welds, and de t ec's:

and evaluate discontinuitics, the angle beam DAC curve must be constructed such that the volume being examined is encompassed within the DAC curve.. A comparison of the metal path ranges of DAC curves utilizing the 2/8, 6/8, 10/8 and 6/8, 10/8, 14/8 VEE-PATH positions is shown in Figure 4. The DAC curve constructed from the 2/8, 6/8 and 10/8 VEE-PATH positions will encompass the examination area metal paths. Only partial coverage of the examination metal paths is obtained when the DAC curve is constructed using the 6/8, 10/8 and.14/8 VEE-PATH positions required by T-535.1(c)(1). In addition to providing superior coverage of the examination area, a DAC curve consisting of the 2/8, 6/8 and 10/8 VEE-PATH positions requires a smaller screen distance. A smaller screen distance calibration will enable the U.T. operator to record indication metal paths more accurately. For

example, if the horizontal base line is divided into 50 small screen divisions and a linear screen distance calibration of 10 inches is established, each screen division represents

.2 inch. If a smaller screen distance such as a 5 inch distance were used, then cach small screen division represents .1 inch and the operator can read indication metal paths to the nearest.1 inch. Theoretically, more Instrument gain would be required to adjust the amplitude of the signal from the 6/8 VEE-PATH position to 757. of full screen height than would be required for the 2/8 VEE-PATH position. However, the increased sensitivity of the 6/8,10/8 and 14/8 DAC curve occurs beyond the examination area metal paths and is therefore not applicabic to the areas being examined. The examination procedure, NQI 3.09 - 0.02, requires scanning at an increase in gain of +14dB or 5X sensitivity. This increase should more than offset the difference in gain between the 2/8 and 6/8 VEE-PATH positions.

E il g. 1 p. f 1 ASME - Codes containing ultrasonic examination criteria applicable to this_ l type of veld have subsequently deleted the requirement to use the 3/8 ' VEE-PATH or 2 inch metal path for the primary reference response. The primary _ reference response is established using the reflector and VEE-PATH position producing the highest amplitude signal. The angle beam DAC curve calibration method specified in NQI 3.09 - 0.02 provides a curve that encompasses the examination area, allows smaller screen distances which improves accuracy of reading metal paths, and permits the comparison of wcld discontinuitics to a code size reflector at distances less than the 3/8 VEE-PATH position or 2 inches. i M M4 foc1 C. C'odwin Southwest Pcacarch Institute Level III U T. Technical Consultant for TU Electric Attachments: Figures 1 through 4 l i l l 1 is 1

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!"!1UELECTRIC OFFICEMEMORANDUM NE 27513 August 15, 1989 John F. Streeter, A08 /~ COMANCHE PEAK STEAM ELECTRIC STATION NQI 3.09 0.02; REVIEW OF DEVIATIONS FROM ASME SECTION V, 1974 EDITION, PARAGRAPH T-535.1(c)(1) AND T 535.2(e) Engineering has completed a' review of the information provided in your letter TUQ 7741. This information and procedure is technically ~ adequate and capable of producing examination results equivalent or superior to the techniques described in ASME V 1974, Article 5, paragraph T 535.1(c)(1) and T 535.2(e). Based on the results of this review the subject procedure, including the technique modifications contained therein, meets the requirements of the specification and governing codes. j i 'i C. B. Hogg 6 /. CBH/1ka cc: ARMS E06 D. P. Barry, SW1/443/ ADMIN l C. R. Hooton, E20 J. T. Maxwell, A08 l l l l l l l l ff 4 I. E 1

. :. ',. ei. F; =. - i 1 TV ELECTRIC NEO QUALITY ASSURANCE DEPARTMENT INSTRUCTION NQI 3.09 0.02 ULTRASONIC EXAMINATION OF CONTAINMENT ELECTRICAL PENETRATION WELDS i l l ^ t 1 REVISION: 0. 's, m. ISSUE DATE: e.* ' y.* l C EFFECTIVE DATE: 1 e APPROVED: A4,1/ 4M_ ' blSCIPLINE VEL flI APPROVED: kEA/p4M MhiACER (A'S APPLICABLE) I fp()

? * i l, NEO QUALITY ASSURANCE DEPARTMENT PROCEDURE NQI 3.09 0.02 'l ULTRASONIC EXAMINATION OF CONTAINMENT ELECTRICAL PENETRATION WEthS 1 1.0 PURPOSE ] The purpose of this instruction is to provide detailed instructions for the performance and evaluation by the manual ultrasonic method, of welds between the containment electrical-penetration liner and neck flanges. 2.0 APPLICABILITY 2.1 This instruction is appif cable to the Quality Control Section of the TU Electric Quality Assurance Department. j 1 2.2 This instruction applies to manual ultrasonic examination of welds between the containment electrical penetration liner and neck flanges in accordance with American Society of Mechanical Engineers ASME Section III and V.

3.0 REFERENCES

3.1 NQA 1.16 3.01 " Nondestructive Examination Personnel Training, Qualification and Certification" 3.2 NQA 2.13 " Quality Assurance Records Program" 3.3 NQA 3.09 " Quality control Inspection and Nondestructive Examination Program" 3.4 NQA 3.09 8.01 " Nondestructive Examination Procedure Qualification and Control" 3.5 CPES N 1041G " Specification, Chemical / Consumable Products" 3.6 ASME Section III, Division 1, Subsection NE,1971 Edition, Summer 1973 Addenda 3.7 ASME Section V,1974 Edition 4.0 DEFINITIONS None 5.0 RESPONSIBILITIES Manager. Quality Control The Manager Quality Control is responsible for the implementation and maintenance of this instruction. l-NQI 3.09 0.02 Rev.: 0 Date: Page: 1 of 7

..'c s r..,_ 6.0 INSTRUCTIONS 6.1 Personnel Qualifications All ultrasonic examination personnel shall be trained, qualified , -and certified in accordance with the requirements of Reference 3.1. 6.2 Procedure Qualification This instruction sh'all be qualified by actual demonstration as prescribed in Reference 3.4 and by personnel certified in accordance with Reference 3.1. 6.3 Equipment and Materisis a6.3.1 A pulse echo ultrasonic instrument shall be used which generates a frequency over the nominal range of 1 to 5 megahertz (MHz). 6.3.2 The electronic apparatus shall contain a calibrated attenuator, accurate over its range to i 20 percent or i 2 decibels (dB) which will allow comparison of indications beyond the viewable portion of the cathode ray tube (CRT) presentation of the instrument. 6.3.3 The refracted shear wave angle of angle beam search units shall be 45 1 2 degrees or 60 1 2 degrees. The actual refracted' beam angle of shear wave search units shall be determined an IIW block. 6.3.4 The nominal frequency of the search unit shall be 2.25 MHz unless variables such as material grain structure require the use of other frequencies to assure adequate penetration or better resolution. 6.3.5 Gearch unit sizes shall be selected from the following: 1/4" x 1/4", 1/4" round 3/8" x 3/8", 3/8" round 1/2" x 1/2", 1/2" round 6.3.6 Appropriate couplant shall be used which is specified in Reference 3.5. 6.4 Basic Calibration Block Material 6.4.1 The material from which the block is fabricated shall be of the same product form, and material specification or equivalent P number grouping as one of NQI 3.09-0.02 Rev.: 0 Date: Page: 2 of 7

1 4 j t the materials being examine 3. For the purposes of this paragraph, P.Nos.1, 3, 4 and 5 materials are considered equivalent. .l' 6.4.2 The calibration block material shall be completely examined with a straight beas unit. Areas that contain 1 s. an indication exceeding the remaining back reflection shall be excluded from the bean paths required to reach I the various calibration reflectors. 6.4.3 The finich on the surface of the block shall be representative of the surface finishes on the-components. Additionally, the calibration block shall be painted to represent the surface of the electrical containment penetration welds. 6.5 calibration Block Configuratio_r3 Appropriate calibration block configuration are specified in Attachment. 8. A. 6.6 System Calibration i 6.6.1 Prior to conducting examinations, the complete system to be utilized shall be calibrated on the applicable-calibration block for the examinations to be conducted. Any change in search units, shoes, couplant, cables. ultrasonic instruments or any other parts of the examination system shall be cause for calibration check. 6.6.2 Sweep range calibration shall be sufficiently long as to allow examination of the entire required volume specified in Attachment 8.8. Sweep shall be calibrated to provide equally spaced increments of the appropriate reference reflectors. 6.6.3 For angle beam distance amplitude correction, DAC curves shall be constructed from the hole perpendicular to the exis of the curved basic calibration block as follows: a. Position the angle beam search unit on the basic calibration block to obtain maximum response from the vee path position, selected from the follow-ing, which produces the highest amplitude: Vee Path Positions 2/3, 6/8, 10/8 NQI 3.09-0.02 Rev.: 0 Date: Page: 3 of 7

4 4 b.- Set the primary reference response' to 75415% of full screen height (FSH) and mark this amplitude on the screen. The gain' controls shall not be adjusted once the primary reference response has been established. c. Maximize responses from the remaining vee path,. positions; mark and join all amplitude points with a smooth curved line that shall extend 1/8 veu path beyond the last qualified calibration poinc. a 6.6.4 System Calibration Verification 6.6.4.1 Calibration shall be verified at the o beginning of each day of examination, and at the end of examinations for which calibration is applicable or every four hours, whichever l is less, and with any change in examination l personnel. l 6.6.4.2 A DECREASE in sensitivity of more than 2 da shall require recalibration and reexaminatica of all items examined since the previous acceptable calibration or check. An INCREASE in sensitivity or more than 2dB shall require recalibration and reexamination and data correction of all indication recorded since the previous acceptable calibration or check. l 6.6.4.3 If any point on the DAC curve has moved on L the sweep line more than 10 percent of the sweep division reading, correct the sweep i range calibration and note the correction in l the examination record. If recordable reflectors are noted on the data sheets, the data shall-be voided, a new calibration established, and areas relative to the voided data shall be reexamined. 1 6.7 Examination 6.7.1 The finished contact surfaces shall be free from weld spatter and any roughness that would interfere with free movement of transducer or would impair the transmission of sound into the material to be examined. 6.7.2 Rate of search unit movement shall not exceed 6 inches per second. 6.7.3 When practical, scanning shall be performed at a minimum gain setting of 5 times the reference level sensitivity, or 14 dB increase. NQI 3.09 0.02 Rev.: 0 Date: l Page: 4 of 7 l

1 s 6.7.4 All scanning shall be performed from both sides of the ~ veld. 6.7.5 All scanning shall be performed such that the beam-covers at least 10 percent of the area covered by the l previous pass. 6.7.6 The volume of base material through which the sound will travel in angle beam examination shall be completely scanned with a straight beam search unit' to 'p. 3etect retlectors whichTight affect interpretation of I angle beam results. Straight beam scanning shall be performed at a gain setting that gives an initial back reflection amplitude of 75415% of full screen height. A linear screen distance calibration is required for this examination. Record' areas giving indications equal to or greater than the remaining back reflection. Additionally, areas where one or more discontinuities produce a continuous total'1oss of back reflection accompanied by continuous indications in the same plane shall be recorded. 6.7.7 Reflectors Parallel to the Weld The search unit shall be placed on the contact surface l with the beam aimed at about 90 degrees to the veld and

l manipulated laterally and longitudinally so the ultrasonic beam passes through all of the weld metal in -

two different approaches of the beam to the reflector. 6.7.8 Reflectors Transverse to the Veld 6.7.8.1 Vhen possible, an angle beam search unit shall be placed on the centerline of the weld l with the beam directed into the veld in'an-axial orientation with respect-to the weld to detect re,f,, lac. tors. transvarig to the weld. f The entire length of the weld shall be scanned with the search unit beam directed in this manner from two opposing directions. 6.7.8.2 If it is not possible to place the search unit on the weld centerline due to weld configuration or surface roughness, the angle beam search unit shall be placed on the base metal with the beam directed tangentially into the veld at a 45 degree i 10 degree angle. The entire length of the veld shall NQI 3.09-0.02 Rev.: 0 Date: Page: 5 of 7 1 l

be scanned with the search unit beam directed in this manner on each accessible side of the veld from two opposing directions, j 6.8 Post Cleaning j 1 Examination areas shall be dry wiped to remove excess wet couplant, if necessary. 6.9 Acceptance criteria IL 6.9.1 All indications which produce a response greater than -l 1-20 percent of the reference level shall bs investigated co the extent that the operator can determine the j 'N shape, identity, and location of all such reflectors j and evaluate them in terms of the acceptance rejection l standards as follows: l l a. Ultrasonic reflectors-not attributable to geometry L are unacceptable if the amplitude ' exceeds the L reference level and have lengths which exceed: i 1. 1/4 in, for t up to 3/4 in., inclusive; 2, 1/3t for t from 3/4 in, to 2 1/4 in., ) inclusive; 3. 3/4 in, for e over 21/4 in. ; l' where t is the thickness of the weld being examined; (If a weld joins two members having i different thicknesses at the weld, e is the thinner of these two thicknesses); b. Where reflectors are interpreted to be cracks, lack of fusion or incomplete penetration, they are unacceptable regardless of signal amplitude. 7.0 FICURES 7.1 Ultrasonic Calibration Record 7.2 Ultrasonic Examination Record p-8.0 ATTACHMENTS 8.A Calibration Blocks 8B Distance Amplitude Correction Curve - Angle Beam Method l NQI 3.09 0.02 Rev.: 0 Date: Page: 6 of 7

a 9.0 RECORDS i 'Vhen complaced, the following fe' s, reports, or other documents generated in response to this p ocedure shall be dispositioned to TV Electtic Records Management in accordence with Reference 3.2. Ultrasonic Calibrati.sn Record Ultrasonic Examinatf &n Record t-f- f i i e t NQI 3.09 0.02 ev.: 0 Date: Page: 7 of 7

) a FICURE 7.1 ULTRASONIC CALIBRATION RECORD i l I i i Lt TRA90httC CALIBRATION RECORD Osrt moroas enigasrce rout

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W t s FIGURE 7.2 j ULTRASONIC EXAMINATION RECORD I I l 1 CDMANCHT MAK UN!IS 14 ELECL81 CAL 2EQWETRADDN wnD ULTRASONIC PXAMINAT10N RECQ@f i e atto.orernarov oart mtox I tuur=re tevet enanator 5-et r m tswere tevet i INO. %Dsc MAX. W L L L;. St* *= stancu NO. MAX. MP MAX Sb% MAX SO% O'It. d2Aa, REMARKS 4 l l l l 6 tiwir.a r.o= 4,wira r.ous neviewco or t t vre oarr w l _ w l NQI 3.09 0.02 Rev.: 0 Date: Page: 7.2 - 1 of 1 i

i i s e ATTACIMENT 8,A CALIBPATION B14CKS 1 P 1%" c:. o i l I Ih IN I r Lh* 4_ l 7 Drilled holes (2 each) 3/32" diameter by 1

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pi ATTACHMENT G.S l DISTANCE AMPLITUDE CORRECTION CURVE ANGLE BEAM METHOD ,'$b fs' I0/g N /- l / '. - ./ VEC PATH POSIT lCN$ PRIMAR Y REFER NCE RC$PONSE SET AT 7S ?4 tS Ye W FULL SCREEN kCIOMT \\ s \\ N \\ \\ s N %., D /b f8 10/g l l NQI 3.09 0.02 Rev.: 0 Date: Page: 8.B - 1 of 1 .,}}

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