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Procedure 12751-MNGP-OPS-01, Revision 0, Spent Fuel Cask Welding

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Procedure 12751-MNGP-OPS-01, Revision 0, Spent Fuel Cask Welding ENCLOSURE 6 PROCEDURE 12751-MNGP-OPS-01, REVISION 0 SPENT FUEL CASK WELDING: 61 BT/BTH NU HOMS CANISTERS 29 pages follow Spent Fuel Cask Welding: 61BT/BTH NUHOMS Canisters DSC#: " Owner Approval: _____ I)ate: ~~~ Owner Approval: _____ I)ate: ~~~ Page 1 ofl9 Spent Fuel Cask Weldlng-61BT/BTH NUHOMS Canisters 127Sl~MNGP-OPS-OI, REV 0 REVISION SUMMARY Rev O Initial Draft Version: Drafted fran TrlVls Core document (NIIS 3 R7. Modified attachments 9.2 and 9.3 per NUH61BTH-4008, NUHOMS 61BTH TYPE 1 & 2 TRANSPORTABLE CANISTER FOR BWR FUEL FIELD WELDING. Approved By Date , Reviewed By Date c"' (.1>4/t 1 /2013> Approved By Date 4\t\\ur~ Page 2 of2!> Spent Fuel Cask Welding-61BT/BTH NUHOMS Canisters 12751-MNGP-OPS-OI, REV 0 TABLE OF CONTENTS SECTION PAQE 1.0 PURPOSE 4 2.0 APPLICABILITY 4 3.0 REFERENCES 4 4.0 REQUIREMENTS 4 s.o DEFINITIONS 4 6.0 RESPONSIBILITIES 4 6.1 Welding Supervisor Duties and Responsibilities 4 6.2 Job Supervisor Duties and Responsibilities 5 6.3 Welder Duties and Responsibilities 5 7.0 SPECIAL INSTRUCTIONS 5 8.0 PROCEDURE 6 8. t General GuldeUnes 6 8.2 GTAW Restriction 6 8.3 Preparation of Base Materials 6 8.4 Assembly 7 8.5 Preheat 8 8.6 Alignment 8 8.7 lnterpass 9 8.8 Rework of In-process Welds 9 8.9 Weld and HAZ Conditions Prior to NDE 9 8.10 Repair of Weld Metal and HAZ Defects Post NDE 10 8. t 1 Base Metal Repairs 11 8.12 Records 11 9.0 A ITACHMENTS 12 9.1 Terms and Definitions 13-16 9.2 Weld Map 17-19 9.3 Weld Data Sheet 20-.25 9.4 Fit up / High-Low / Depth Record 26 9.5 Field Comment and/or Repair Log 27-29 Page3of29 Spent Fuel Cask Welding-61BT/BTH NUHOMS Canisters 12751-MNGP-OPS-Ol, REV 0 1.0 PURPOSE 1.1 Provides detailed instructions for making welds on the NUHOMS spent fuel cask canisters. 2.0 APPLICABILITY 2.1 This General Welding Standard encompasses welding perfonned by Tri Vis using the Welding Procedure Specifications that are issued for use with this procedure. 3.0 REFERENCES 3 .1. ASME Section III "Nuclear Power Plant Components" 1998 Edition with Addenda through 1999 3.2 QP-9.0, Welding Program 3.3 W AP-1, Control of Welding and Brazing Procedure Specifications 3.4 W AP-2, Control of Welder and Welding Operator Qualifications 3.5 WAP-3, Control of Filler Metal 3.6 Drawing Number: NUH61BTH-4008; NUHOMS 61BTH TYPE 1 & 2 TRANSPORTABLE CANISTER FOR BWR FIELD WELDING 4.0 REQUIREMENTS 4.1 All welding perfonned shall confonn to the applicable guidelines and/or restrictions set forth in this procedure, and the applicable code and project requirements. 4.2 No deviations from ~ential variables of the assigned Welding Procedure Specification (WPS) will be permitted without a revision to the WPS. Only the Welding Supervisor may change non-essential variables. These changes are to be noted on the assigned Weld Data Sheet (Attachment 9.3). 4.3 All Welding Procedure Specifications and Procedure Qualification Records shall be developed and controlled with W AP-1. 4.4 All Welders and Welding Operators shall be qualified and qualification maintained in accordance with W AP-2. 4.5 Welding filler metal shall be controlled in accordance with WAP-3, if applicable. Spooled wire may be left on the machine if said spool is secured to prevent removal or unauthorized welding. 5.0 DEFINITIONS 5.1 See Attachment 9.1 6.0 RESPONSIBILITIES 6.1 Welding Supervisor Duties and Responsibilities 6.1.1 Assuring there are qualified welding procedures for each material being welded. 6. I .2 Interpretation of the requirements imposed by this procedure. and applicable code and project requirements. 6.1.3 Providing instruction to the Job Supervisors and Welders as needed. Page4 of29 Spent Fuel Cask Welding -61BT/BTH NUHOMS Canisters 12751-MNGP-OPS-Ol, REV 0 6. J .4 Assuring that welding is being perfonned in accordance with this procedure. 6.1 .5 Assuring that all welders under his/her control are qualified for the welding they are performing. 6.1.6 Initiate and review weld maps and weld records. This may be delegated to Job Supervisors after appropriate training has been given. 6.1.7 Requisitioning appropriate welding materials for the welder's use in accordance with WAP-3, if applicable. 6.2 Job Supervisor Duties and Responsibilities 6.2.1 Identify any job data package that will require any welding for the Welding Supervisor's attention. 6.2.2 Assuring that all welders have been trained in the use of the applicable welding procedures. 6.2.3 Notifying the Welding Supervisor of conditions that are in violation or outside of this welding procedure. 6.2.4 Assuring that all welders under his/her control are perfonning acceptable welds. 6.2.5 Assure that all welders under his/her control have been trained to and work safely in accordance with TriVis Health & Safety Manual and/or Site Safety Policies. 6.3 Welder Duties and Responsibilities 6.3.1 Performing welding within the guidelines of this procedure and the assigned Welding Procedure Specification. 6.3.2 Infonning the Supervisor of any problems, deviations or malfunctions that develop. 6.3.3 Identifying all welds with his/her assigned Welder Identification Symbol using Attachment 9.3. 6.3.4 Assuring a fire watch is posted for all welding performed, as required. 7.0 SPECIAL INSTRUCTIONS 7.1 All welding shall be perfonned using Site Hot Work Pennits (Fire Watch). 7.2 All welding shall be perfonned using TriVis Health & Safety Manual and/or Site Safety Policies. 7.3 The metal canister serial number shall be identified on Attachment 9.3 and an orientation sketch shall be drawn to assure location of any repairs. As applicable, the sketch shall also show the location of segmented closure plate welds, etc. 7.4 All welders should have been given mockup training and shall be designated as approved for assignment to this work by the Welding Supervisor. 7.5 Setup and control shield gas purge flow by using the installed argon bottle flow regulator. Page 5 of29 Spent Fuel Cask Welding-61BT/BTH NUHOMS Canisters 12751-MNGP-OPS-01, REV 0 8.0 PROCEDURE 8.1 General Guidelines 8. 1.1 All equipment used for welding shall be in proper working condition so that any qualified welder using it will be able to weld within the parameters of the WPS and obtain satisfactory results. 8.1.2 All vertical progression of welding shall be in accordance with the Welding Procedure Specification. 8.1.3 Should any equipment, filler metal or electrode produce abnormal results or exhibit an unusual appearance. its use should be stopped and the incident reported to the Job Supervisor. 8.1.4 All base metals shall be cleaned thoroughly in accordance with Section 8.3 ofthis procedure prior to welding. 8.1.5 If discontinuities are noted during the welding process, the welder shall stop and remove the discrepancy from the weld or heat affected zone. Prior to the addition of subsequent layers, the operator shall make necessary adjustments to the welding machine, within the WPS parameters, to correct the problem(s). 8.1.6 Weave width restrictions are to be measured from edge to edge using the guidance found on the WPS. 8.2 GfAW Restriction 8.2.l The GTAW process shall be used with the addition of filler metal only. No "wash" passes are allowed. 8.2.2 Due to the nature of the helium backfill process, a maximum of2.4% hydrogen and up to I OOo/o helium backing gas may be present on the backside of the weld joint. 8.2.2. l Even though the intent is not to purge the backside of the weld joint, due to the nature of the cask, there may be air, hydrogen, helium or a combination on the back side of the joint. 8.3 Preparation of Base Materials 8.3. l All surfaces to be joined by welding shall be brought into the joint configuration shown on design drawings, weld data sheets, or specifications. The joint details shown on the WPS are for illustrative purposes only. 8.3.2 End preparations shall be prepared to bright metal and should be made by machining, grinding, sawing, shearing, etc ... 8.3.3 After acceptable end preparations have been made, the surfaces shall be protected from damage if they are not immediately welded. 8.3.4 All the weld joints shall be protected from non-radiological contamination and from rain, snow, and winds, prior to and during welding. Welding shall not be performed on wet surfaces. Page6 of29 Spent Fuel Cask Welding -o1BT/BTH NUHOMS Canisters 12751-MNGP-OPS-01, REV 0 8.3.5 All surfaces to be joined by we)ding shall be cleaned prior to welding within a minimum of one inch on either side of the weld. Either a mechanical method or a solvent method or both shall remove paint, oil, rust, grease, scale or other harmful material. 8.3.6 Mechanical Cleaning Method A. Grinding, machining, filing, deburring, sanding, wire brushing, etc. shall be used to clean the joint surfaces of al) contaminants. All grinding whee)s shall be made of a resin or rubber-bonded alumina or silicon carbide compound. Wire brushes shall be made of Stainless Steel. B. Caution shall be exercised not to reduce the wall thickness or joint configuration when mechanical cleaning is employed.
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