ML18100A188
| ML18100A188 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 04/11/2013 |
| From: | Northern States Power Company, Minnesota, TriVis |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML18100A173 | List: |
| References | |
| CAC 001028, EPID L-2017-LLE-0029, L-MT-18-013 | |
| Download: ML18100A188 (13) | |
Text
ENCLOSURE 7 PROCEDURE 12751-MNGP-QP-9.201, REVISION 0 VISUAL WELD EXAMINATION 12 pages follow
TriVis NDE Services, LLC A Division of Tri Vis Inc.
Visual Weld Examination Procedure No.: 12751-MNGP-QP-9.201 RO
- - - ~- - -- - PageO
Visual Weld Examination Revblon 3umrnmy and Approwil Rev.No. Rnlelon Summary 0 This Is the Initial 1-.. ot ttlla document a e prqect &pecffio PfOC*M8 end i6 based on therequlrelllentsofQP-9.201, ReY8.
03/27/2013 NDE/OC Supa,visorfTiMa-NDE i.evei 111 Reviewed
.;;;;~~--
J , <Ouallty Assurance"'Manager Approved:
t ,r Department Man Date 1
Visual Weld Examination 1.0 PURPOSE This procedure provides the requirements for direct visual examinations of materials, parts, components, in-process, and final welds on NUHOMS canisters.
2.0 DEFINITIONS 2.1 In-Process Welds -welding performed leading up to the final weld surface (e.g. - tacks, root, etc.) prior to NDE.
2.2 Final Weld Surface - The surface of the final weld after all required surface finishing operations have been completed.
2.3 Work Documents - Include but are not limited to work instructions, procedures, design drawings, and applicable codes.
3.0 REFERENCES
3.1 Applicable Spent Fuel Canister Welding Procedure 3.2 ASME Boiler & Pressure Vessel Code, Section V, Article 9, 1998 Edition w/ Addenda through 1999.
3.3 ASME Boiler & Pressure Vessel Code, Section Ill, Division I, NB 5300, 1998 Edition w/
Addenda through 1999.
3.4 QP-9.200 Written Practice for the Qualification & Certification of Nondestructive Examination (NOE) Personnel.
3.5 VT Qualification Letter dated June 23, 2006 3.6 12751-MNGP-QP-9.202, Color Contrast Liquid Penetrant (PT) Examination Using the Solvent-Removable Method 4.0 GENERAL REQUIREMENTS 4.1 PERSONNEL REQUIREMENTS 4.1 .1 TriVis personnel performing NOE shall be qualified and certified in accordance with QP-9.200, Written Practice for the Qualification & Certification of Nondestructive Examination (NOE) Personnel.
4.1 .2 Personnel provided to TriVis, as an approved contractor, shall be certified in accordance with the contractor's written practice developed according to SNT-TC-1A: 1992 or stricter.
4.1.3 Nondestructive examination personnel shall be certified to at least NOE Level II.
4.2 EXAMINATION REQUIREMENTS 4.2.1 Procedure Qualification:
A. The ASME B&PV Code, Section V, Article 9, identifies the requirements listed below as essential variables:
- Change in technique (direct to or from translucent or direct to remote)
- Remote visual aids
- Personal performance requirements (when required)
- Lighting intensity (decrease only) 2
Visual Weld Examination B. Changes to any of these requirements shall require requalification of this procedure by demonstration and the procedure shall be revised.
C. This procedure was developed from QP-9.201, which was qualified as described in Attachment 1, vr Qualification Letter. Since the initial qualification, none of the essential variables have changed; therefore this procedure is considered a qualified procedure.
4.2.2 Direct Visual Examination:
Direct visual examination may be made when access is sufficient to place the eye within 24 inches of the surface to be examined and at an angle not less than 30 degrees to the surface being examined. Mirrors may be used to assist examinations.
4.2.3 Lighting Requirements:
The specific part, component, weld, or section thereof under immediate examination shall be illuminated with natural or supplemental white light to attain a minimum light intensity of 100 foot candles. The light intensity shall be measured using an appropriate calibrated light meter. Lighting values shall be documented according to Section 8.1 of this procedure.
4.2.4 Measuring Devices:
Machinist scales with 1/64-inch graduations or other devices of equivalent accuracy may be used for the evaluation of defects. Other measuring devices shall be capable of accuracy to the tolerances of the design specifications.
4.2.5 Cleanliness
Prior to examination, verify the surface to be examined and adjacent areas within at least one (1) inch of the area to be examined is dry and free of dirt, lint, scale, welding slag or flux, spatter, paint, oil, or other extraneous matter that would interfere with the examination .. Either a mechanical method or a solvent method, or both, shall remove paint, oil, rust, grease, scale or other such material.
4.2.6 Base Material Evaluation:
A. Indications in base materials which are discovered during the process of fabrication or installation shall be dispositioned. Exploration to the extent necessary to determine compliance to work documents shall be governed under the approved weld traveler, approved repair plan, and/or documented engineering disposition.
B. Indications which may warrant further evaluation are:
- Nicks, gouges, dents, or other mechanically or thermally caused surface indications which are suspected to reduce the thickness below the design minimum thickness of the material.
- Any evidence of basic material problems such as laps, seams, laminations, or casting defects related to the material manufacturer.
4.2. 7 Base Metal Repairs Base materials which require excavation and NDE examination and /or repair by welding and post weld NDE examination shall be governed under the approved project specific weld traveler, approved repair plan and documented engineering disposition.
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Visual Weld Examination 5.0 PROCEDURE 5.1 EXAMINATION PRIOR TO WELDING :
5.1.1 Joint design, edge preparation and fit up shall be examined in accordance with the applicable Spent Fuel Canister Welding procedure and approved drawings to ensure proper tolerances are achieved and that welded areas are free of defects.
5.1 .2 Surfaces for welding shall be dry and free of scale, rust, oil, grease, water, and other foreign material.
5.2 HEAT AFFECTED ZONE (HAZ) AND/OR IN-PROCESS AND FINAL WELD EXAMINATION:
The area of examination includes the weld plus 1 inch on either side of the weld surface.
As a minimum, the weld surface shall be examined for the following (if applicable):
- coarse ripples
- coarse grooves
- overlap
- abrupt ridges and valleys
- cracks
- porosity
- lack of fusion
- lack of penetration
- undercut 6.0 ACCEPTANCE CRITERIA 6.1 All welds require final inspection in accordance with this procedure and the applicable Spent Fuel Canister Welding procedure.
6.2 An indication shall be considered relevant if dimensions along its major axis meet or exceeds 1/16 (0.0625) inch.
A. Weld reinforcement may be measured with any suitable welding inspection gauge.
B. Weld throat and edge preparation depth may be measured with a depth gauge or similar mechanical gauge for comparison of plate surface to weld depth.
6.3 Weld and HAZ Acceptance Criteria:
A. Cracks: UNACCEPTABLE.
B Incomplete Fusion: UNACCEPTABLE.
C. Stop/Start Craters: UNACCEPTABLE.
D. Linear indications (those indications whose length greater than three times their width): UNACCEPTABLE.
E. Porosity or rounded indications (those which are circular or elliptical with their length equal to or less than three times their width): UNACCEPTABLE.
F. Arc strikes and associated blemishes: UNACCEPTABLE.
G. Weld reinforcement greater than specified in the project weld traveler in the applicable Spent Fuel Canister Welding procedure:
UNACCEPTABLE.
H. Undersized welds (underfill): UNACCEPTABLE.
I. Undercut (wash, scalloping or other related non standard terms): shall not exceed 1/32 inch, (0.031) in any direction.
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Visual Weld Examination 7.0 WELD DEFECT REMOVAL AND REPAIR Weld defect removal and repair shall be performed and documented in accordance with the applicable Spent Fuel Canister Welding procedure.
8.0 DOCUMENTATION 8.1 Record the result of the examination and all pertinent information for performing the examination on the attached VT/PT Examination Report. Other forms may be used provided the required data is documented. Record the following information as applicable 8.2 All non-rejectable and rejectable indications noted during the inspection shall be documented and detailed.
8.3 The form VT/PT Examination Report shall be filled out in its entirety. N/A all that does not apply.
9.0 ATTACHMENTS Attachment 1 VT Qualification Letter 10.0 FORMS 12751-MNGP-QP-9.201-01 5
Visual Weld Examination TrlVis Project Number: Report Number:
VT/PT Examination Report 12751 Page 1 of 5 Customer: Date of Examination:
Contract Number: Exam Surface:
Component ID: Drawing Number:
Weld Number(s): Original Exam : D Re-examination D Device Number:
Light Meter Number:
Calibration Due Date:
Calibration Due Date:
Verify that all temperature(s) at the surface(s), to Verify that the light intensity, at the surface of the test be examined, are between 50°F and 325°F.
component, is 100 Foot candles (fc) or greater.
...Note - Temperatures are recorded in "Additional Measured Intensity: fc llluminator:
Information".
Examination Method(s) Penetrant Family:
D Direct Visual Examination Penetrant: Batch: Dwell:
Procedure: Rev.
- Cleaner: Batch: Dry:
D Solvent Removable PT Exam. Developer: Batch: Develop: _ _
Procedure: Rev. *Note - Dwell, Dry and Develop are express in minutes recorded.*
ADDITIONAL INFORMATION EXAMINATION RESULTS SATISFACTORY D UNSATISFACTORY D SECOND EXAMINER N/A D EXAMINER: LEVEL (Print Name) (Signature)
EXAMINER: LEVEL (Print Name) (Signature)
Form 12751-MNGP-9.201-01 6
Visual Weld Examination TrlVis Project Number: Report Number:
VT/PT Examination Report 12751 Continuation Sheet for ITC Components:
PAGE: 2of5 ITC WELD SECTION oo 180° Notes:
Form 12751-MNGP-QP-9.201-01 7
Visual Weld Examination TriVis Project Number: Report Number:
VT/PT Examination Report 12751 Continuation Sheet for ITC Components:
PAGE: 3 of 5 KEYWAY SECTION Notes:
Form 12751-MNGP-QP-9.201-01 8
Visual Weld Examination TriVis Project Number: Report Number:
VT/PT Examination Report 12751 Continuation Sheet for OTC Components:
PAGE: 4of 5 OTC WELD SECTION 180° Notes:-------------------------------
Form 12751-MNGP-OP*9.201-01 9
Visual Weld Examination TriVis Project Number: Report Number:
VT/PT Examination Report 12751 Continuation Sheet for OTC Components:
PAGE: 5 of 5 PLUG WELD SECTION Notes:
Form 12751-MNGP-QP-9.201-01 10
Visual Weld Examination ATTACHMENT 1 LEAK TESTING SPECIALISTS, INC.
w11,w.l.8il..Mna;;,k.&DA
)790 Hollher /WC. Sul\e ,0) Orlando, FL 321122 'Phone ('°7) 1]7-64 U l'ax (of07) 737-6416 OffkN la : W--*'°"' UC -l'Oftland, OR - Or-, PL Juno 23, 2006 To: Letter to flle The pwpose of this l4ltter la to document the Pmcedure Qualification as cle.<<;ribed in ..e1ion 4 .2, paragraph 4.2. J oCTriVla fnc. Vhual procedure, QP-9.201 Revilion l, VJSUAL WELD EXAMINATION OF DRY CASK ASSEMBLY usi"8 the direct visual method.
The qualiflcatlon wu perl'ormecl in IICCOrdance with the above listed procedure, and ASME Section V Article 9, 1998 Edition wilh 1999 & 2000 Addenda'**
Natural llgl,ting aupplemented by a fluhllaht, 12" ruler, 6" acalo with 1/32" and 1/64" incremente, a liahl meter, UICI a surface almilar 10 &hat lo bo oxamlnod WCfO used for this decnoNtntion. Pla~oa the scale oo tho 111r1lico al tbe , _ dbcemible locadon, holdina the flashliahl al approximately 12", and Maintalnins the eye wllhln 24* at an aoale .,-eater than 30°,
both the J/)2" and 1/64" incn,menta w-dearly vlllble.
IJahl Mctcr-(LTS) LM-00 I Uaht intensity @ appraximatdy 12" wu 184 fc.
In conclusion, 1his demonstration qualifiea the adequacy ofTriVis Inc. Visual procedure, QP-9 .201, Revision 01.
\ e m ~ ~ , n e d by David Jfeclcsel (LTS)
David Heclue!
Leak Testing Specialists, Inc.
Levelll VT Note: Because this qualification letter is written to the TriVis core document QP-9.201, correlation is recognized between said document and this project specific document (12751-MNGP-QP-9.201 Rev 0).
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