ML19329E163

App 5G of AR Nuclear 1 PSAR, QC Procedure for Field Welding of Liner Plate. Includes Revisions 1-18

ML19329E163
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/24/1967
From:	ARKANSAS POWER & LIGHT CO.
To:
References
NUDOCS 8005300777
Download: ML19329E163 (6)

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APPEUDIX 5-G QUALITY COUTROL PROCEDURE FOR FIELD WELDIUG OF LINER PLATE 1.0 SCOPE This procedure outlines the general require =ents for welding quality control to assure that all field welding of liner plate is perfcrmed in full compliance with the applicable job specifications.

2.0 QUALIFICATIONS FOR WELDI"G HISPECTORS All welding inspectors who are to inspect welds covered by this specification shall be qualified by meeting the following minimum requirements:

2.1 Inspectors shall have a thorough knowledge of the various welding pro-cesses and techniques employed in field construction, and shall be able to demonstrate the proper methods for shielded metal-are welding, gas tungsten-are welding, gas metal-arc welding, and oxyacetylene welding.

2.2 Inspectors shall have a minimum of two years' pre ious welding inspection experience, or equivalent experience and training in welding fabrication and non-destructive testing.

2.3 Inspectors shall be required to demonstrate to the satisfaction of the responsible Bechtel Metallurgical and Quality Control Services represen-tative, their knowledge of the fundamentals, techniques, and application of the inspection methods set forth in this standard, i.e., visual magnetic particle, liquid penetrant and radiographic inspection.

3.0 WELDING FERFORMED BY BECHTEL CONSTRUCTION FERSONNEL 31 Welding Procedure Specifications -- All welding performed by Bechtel Construction personnel shall be in strict accordance with approved Bechtel Welding Procedure Specifications. The appropriate Bechtel Welding Procedure Specifications for field welds will be prepared, qualified and issued to the field by the Bechtel Metallurgy and Quality Control Services Department, as directed by Power Division Engineering.

32 Welder Qualification -- All welders who are to take welds under Bechtel Welding Procedure Specifications shall be qualified by perfoming the tests required by the applicable Bechtel Welder Perfomance Specification WQ-F-1 for ferrous materials, and WQ-NF-1 for non-ferrous materials.

These Bechtel specifications encompass the requirements of Section IX of the ASME Code. No welder shall be permitted to perform production weld-ing until he has passed the necessary tests and has the appropriate Welder Performance Qualification Test Record (Form Ho. WR-1) on file at jobsite. All testing of welders shall be under the direction of the field welding inspector.

4.0 WELDING PERFORMED BY BECHTEL SUBCOUTRACTORS 5-G-1

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4.1 Welding Procedure Specifications -- All welding performed by Bechtel Sub-contractors shall be in strict accordance with the applicable job specifications.

When those specifications require Engineering approval of welding procedures, no production welding shall be permitted without prior approval of such procedures by power Division Engineering. When Engineering approval is not specified but welding is to be performed under a Code or Standard which requires qualified welding procedure specifications, then the Subcontractor must prepare and qualify his welding procedures accordingly, prior to beginning any production work.

The field welding inspector shall be responsible in all cases for deter-mining that the Subcontractor's welding is being performed in accor-dance with properly qualified and, as necessary, Engineering approved welding procedure specifications.

4.2 Welder Qualification -- All welders and welding operators e= ployed by Subcontractors who are to make welds under a Code or Standard which requires qualification of welders shall be tested and qualified accord-ingly before beginning production welding. Each Subcontractor shall be responsible for testing and qualifying his own welders. The Bechtel field welding inspector shall be responsible in all cases for determin-ing that the Subcontractor's welders have passed the necessary qual-ification tests and that the Subcontractor has on file at jobsite the proper qualification test record for each qualified welder.

L 5.0 INSTRUCTIONS FOR BECHTEL FIELD WELDING INSFECTORS The general instructions for Bechtel field welding inspectors which follow are T intended to cover welding perfomed by both Bechtel Construction and Bechtel )

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5.1 Welding Procedure Specifications -- It is the responsibility of the field welding inspector to assure that all welding is performed in strict accordance with the appropriate qualified welding procedure specifications.

Specific items to be checked follow:

i 5.1.1 Detemine that the proper welding procedure specification has been selected to match the base materials being welded and the welding processes being employed.

5.1.2 Pemit only welders properly qualified under the essential variables of each welding procedure specification to make welds under that procedure.

1 5.1.3' Check to see that the welding electrodes, bare filler rod, consu=able insert rings, and backing rings all match that which has been specified.

5.1.4 Inspect weld joints as necessary prior to welding to insure proper edge-penetration,-cleaning, and fit-up.

5.1.5 Check to see that the welding machine settings are correct and fall within the range of current and voltage specified.

5.1.6 Check for proper preheat and interpass temperature.

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5.1 7 Inspect the in-process welding for proper technique, cleaning between passes, and appearance of individual weld beads.

52 Post Weld Heat Treatment -- The field welding inspector shall inspect each postweld heat treatment (themal stress relieving) operation to insure conformance with the applicable job specifications. Specific items to be checked shall include the following:

5.2.1 A sufficient number and proper location of thermocouples shall be selected to accurately record temperatures.

5.2.2 The themoccuples shall be connected to temperature indicator-recorders which will provide a pemanent record of the heating rate, holding temperature and time, and the cooling rate.

5.2 3 Temperature charts shall be checked for proper heating rate, holding temperature, holding time, cooling rate, and that the proper weld identification is recorded on the chart.

5.3 Visual Inspection of Welds -- The field welding inspectors shall be res-ponsible for carrying out the necessary welding surveinance to insure that all welding meets the following requirements for visual quality and general workmanship. Visual inspection shall be performed prior to, during, and after welding.

531 All welds beads, passes, and completed welds shall be free of slag, cracks, porosity, incomplete penetration and lack of fusion.

532 cover passes sh:.11 be free of coarse ripples, irregular surface, non-uniform bead pattern, high crown, deep ridges or valleys between beads, and shall blend smoothly and gradually into the surface of the base metal.

533 Butt welds shall be slightly convex, of uniform height, and shall have full penetration.

5 3.4 Fillet welds shall be of specified si::e, with full throat and, unless otherwise specified, the legs shall be of approximately equal length.

535 Repair, chipping, or grinding of welds shall be done in such a manner as not to gouge, groove, or reduce the base metal thicknesses.

5 3.6 Where different base metal thicknesses are jointed by welding, the finished joint shall have a taper no steeper than 1:4 between the  ;

thick and thin sections. l l

5.4 bhgnetic Particle Inspection -- j 5.4.1 The field welding inspector shall be responsible for determining that l all magnetic-particle inspection is properly performed.

5.4.2 When the applicable job specifications require Magnetic Particle In-spection of welds, the field welding inspector shall be responsible 00<33.

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for determining that the proper technique is follwed and that the results are properly interpreted. The field welding inspector shall require the inspection Subcontractor's responsible personnel to demon-strate their knowledge and understanding of the applicable specifi-cations prior to perfoming any production testing.

5.4.3 Special attention shan be given to the following items for all

. Magnetic particle Inspection:

5.4.3.1 Detemine that surfaces to be inspected have been properly cleaned and are free of crevices which can produce false indications by trapping the iron powder.

4 5.4.3 2 Detemine that the power source, current density, prod spacing, and application of iron powder all comply with the applicable specif-ication requirements.

5.4.3 3 pemit no arcing between the prods and weld surfaces.

5.4.3.4 Interpret all linear or linearly disposed indications as defects.

5.4.3.5 Probe questionable indications by thermal cutting, chipping, grind-ing, or filing to confim the presence or absence of actual defects.

5.5 Liquid penetrant Inspection --

551 The field welding inspector shan be responsible for determining that all liquid penetrant inspection is properly perfomed. )

5.5.2 When the applicable job specifications require Liquid Penetrant In-spection for welds, the field welding inspector shall be responsible for determining that the proper technique is followed and that the results are properly interpreted. The field welding inspector shall require the inspection Subcontractor's responsible personnel to demon-strate their knowledge and understanding of the applicable specifi-cations prior to perfoming any production testing.

553 Special attention shall be given to the following items for all Liquid Penetrant Inspection:

5.5.3.1 Detemine that surfaces to be inspected have been properly cleaned and are free of crevices which can produce false indications by trapping the dye penetrant.

5.5 3 2 check to see that cleaner, dye penetrant, and developer are properly applied and the specified time intervals for dye penetration and developing are followed.

5.5 3.3 Detemine that indications are properly interpreted. Defects will be identified as red stains against the white developer background.

Red lines or -linearly disposed red dots are indicative of cracks.

porosity and pinhole leaks appear as local red patches or dots.

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5.5.3.4 Examine questionable indications by a 5x or stronger hand lens, and probe by grinding or filing to confirm the presence or absence of defects.

5.6 Radiographic Inspection --

5.6.1 The .d welding inspectors shall be responsible for determining that

.adiographic inspection is properly performed.

5.6.2 When the applicable job specifications require radiographic inspection of welds, the field welding inspector shall be responsible for deter-mining that proper radiographic technique is followed and that the completed filns are properly interpreted. The field welding inspector shall require the Subcontractor's responsible personnel to demonstrate their knowledge and understanding of the applicable specifications prior to beginning the radiographic inspection. The field welding inspector shall also review each completed radiograph.

5.6.3 Special attention shall be given to each of the following items for all radiographic inspection:

5.6.3.1 Check the type of film intensifying screens, penetrameters, and source of radiation for conformance to th'e job specifications.

5.6.3.2 Check the relative location of film, penetrametern, identifying numbers, and radiation source for each typical exposure.

5.6.3 3 Review all completed film for quality and interpretation of defects.

Check the exposed and developed film for proper density and visibility of penetrameters. Radiographic film of unacceptable quality or with questionable indications of defects shall be reradiographed.

5.7 Repairs -- It shall be the responsibility of the field welding inspector to determine that all weld defects in excess of specified standards of acceptance shall be removed, repaired, and re-inspected in accordance with the applicable job specifications.

5.8 Records -- It shall be the responsibility of the field welding inspector to determine that proper records of nondestructive testing are kept on file at the jobsite.

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