ML20078D851

Fabrication of Shroud Stabilizer

ML20078D851
Person / Time
Site:	Quad Cities
Issue date:	01/06/1995
From:	Fortin A GENERAL ELECTRIC CO.
To:
Shared Package
ML19311B683	List: ML20078D832 ML20078D840 ML20078D843 ML20078D851 ML20078D853 ML20078D861
References
25A5670, 25A5670-R02, 25A5670-R2, NUDOCS 9501310021
Download: ML20078D851 (13)

Text

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6 gg 670 SH NO.1 EIS IDENT: FAB SHROUD STABILIZER REVISION STATUS SIIEET DOCUMENTTITLE FABRICATION OF S11ROUD STABILIZER LEGEND OR DESCRIPTION OF GROUPS 'n'PE: FABRICATION SPECIFICATION FMF: QUAD CITIES 1 AND 2 ,

MPLNO PRODUCT

SUMMARY

SECTION 7 B13-D001 TIIIS ITEh! IS OR COhTTAINS A SAFETY-RELATED ITEh! YES X NO U EQUIP CLASS CODE E REVISION l C O Rhi-01586 OCT 311994 1 JL TROVATO NOV 16 '94 RJA CN01849 CliK BY:JL TROVATO i ER MOliTASliEMI i

2 RJA JLTROVATO J M 0 6 19 3 CN01951 CliK BY: JL TROVATO ,

ER MOIITASIIEMI '

PRINTS TO MADE BY APPROVALS GENERAL ELECTRIC COMPANY 175 CURTNER AVENUE A. FORTIN 10/18/94 E.R. MOIITASliEMI 1/06/95 SAN _ JOSE CALIFORNIA 95125 CIIKD BY: ISSUED OCT 311994 A. FORTIN 10/18/94 R. J. A11MANN CONT ON SIIEET 2 9501310021 DR 950116 ADOCK 05000254 PDR

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1. SCOPE 1.1 This specification defines the requirements for fabrication of the shroud stabilizer hardware.

These requirements apply as described herein to wrought austenitic stainless steels, types 304, 304L,316,316L, stainless steel type XM-19, and Ni-Cr-Fe alloy X-750 materials.

1.2 Definitions Buyer-GE Nuclear Energy (GENE)

Fabricator - The supplier authorized by GENE to perform fabrication services for the hardware items comprising the shroud stabilizers. {

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2. APPLICABLE DOCUMENTS l

1 2.1 GE Nuclear Enerev Documents. The following documents form a part of this specification to  !

the extent specified herein. In case of any conflict between this document and any of the ,

following, the requirements of this document shall govern.

a. P50YP102 (Rev.10) Arc Welding of Austenitic Stainless Steels ,

b. P50YP211 (Rev.1) Cleaning and Cleanliness Control of Reactor System Components

c. E50YP20 (Rev. 4) Determination of Carbide Participation in Wrought Austenitic Stainless Steels  :

d. E50YP11 (Rev. 3) Examination for Intergranular Surface Attack

e. E50YP22A (Rev. 3) Liquid Penetrant Examination

f. Y1010A3 (Rev. 0) Shop Applied Practices

g. P10JYP2 (Rev.12) Age Hardening of Ni-Cr-Fe Alloy X-750 2.2 Codes and Standards. The following codes and standards (issue in effect at the date of the purchase order, or as specified in this specification or its supporting documents) form a part of this specification to the extent specified herein.

2.2.1 American Society of Mechanical Eneineers (ASME) Boiler and Pressure Vessel Code

a.Section III, Subsection NG, Core Support Structure,1989 Edition.

b.Section IX, Welding and Brazing Qualification,1989 Edition.

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c.Section II, Material Specificadon, latest edidon.

2.2.2 American Weldine Society (AWS) Standards

a. AWS-A2.4, Symbols for Welding and Nondestrucdve Tesdng

b. AWS-A3.0, Terms and Definitions 2.2.3 American Society for Testine and Materials (ASTM)

a. ASTM A-370, Specification for Mechanical Testing of Steel Products

b. ASTM A-182, Specificadon for Forged or Rolled Alloy Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

c. ASTM A-240, Specificadon for Heat-Resisting Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels

d. ASThi A-479, Specification for Stainless and Heat-Resisdng Steel Wire, Bars, and Shapes for Use in Boilers and Other Pressure Vessels 1

e. ASTM B-637, Specificadon for Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Seivice

f. ASTM A-262, Detecting Suscepdbility to Intergranular Attack in Stainless Steel

g. ASTM A-412, Specificiadon for Stainless and Heat Resisting Chromium-Nickel-Magenese Steel Plate, Sheet and Strip.

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h. ASTM E-384, Standard Test Method for Microhardness of Materials.

2.2.4 US Federal Recister Code of Federal Reculations (CFR)

a. 10 CFR 50 - Title 10, Energy; Chapter 1, Nuclear Regulatory Commission; Part 50, Licensing of Producdon and Udlization Facilitics, Appendix B, Quality Assurance Criteria for Nuclear Power Plants.

b. 10 CFR 21, Reporting of Defects and Noncompliance 2.2.5 American National Standard Institute (ANSI /ASME)

a. ANSI /ASME NQA-1, Quality Assurance Program Requirements for Nuclear Facilities,1986 Edidon.

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b. ANSI /ASME N45.2.2 Packing, Shipping, Receiving, Storage and Handling of Items for Nuclear Power Plants,1978 Edition.

c. ANSI /ASME N45.2.13, Quality Assurance Requirement for Control of Procurement ofItems and Senices for Nuclear Power Plants,1976 Edition.

2.3 Other Documents

a. BWROG-VIP, Core Shroud Repair Design Criteria, Latest revision.

b. Com Ed Technical Requirements document for Dresden/ Quad Cities Core Shroud ,

Repairs, NEC-12-4056, Rev 0. l S. REQUIREMENTS j 3.1 General. This specificadon is for use in conjunction with detail product drawings which define the requirements for each part of the shroud stabilizers. It is intended that all parts will be ;

fabricated without welding. Welding requirements are only included herein as a repair contingency. i I

3.2 Materials. Parts shall be fabricated from materials specified on the detail product drawings and the additional requirements of this specification. The material for each completed part shall l be traceable to its cerdfied material test report (CMTR). Physical and chemical overcheck tests l are required for each heat number of material in accordance with ASTM A-370.

3.2.1 X-750 Material. Nickel-chrome-iron (Ni-Cr-Fe) alloy X-750 shall be in accordance with ASTM B-637, UNS N07750, and the additional requirements specified below.

l 3.2.1.1 X-750 Maximum Cobalt. The maximum cobalt content of NiCr-Fe alloy X-750 material shall be 0.09 percent.

3.2.1.2 X-750 Hot Forming. Ni-Cr-Fe alloy X-750 shall be hot formed in accordance with a buyer l approved fabricator's procedure. I 3.2.1.3 X-750 Heat Treatment. Ni-Cr-Fe alloy X-750 shall be annealed at 1975 25'F (metal temperature) and forced-air cooled after hot forming operations. The center of the cross-section shall be held at this temperature for 60 to 70 minutes. Equalizing heat treatment at 1500*F to 1800T is prohibited. Product forms with both cross section dimensions less than six inches by six inches may be water quenched after annealing as a vendor option, and with buyer approval.

Materials tests shall be performed at both 70*F and 550T, on specimens which have been annealed and age hardened.

ggg 670 SH NO. 5 3.2.1.4 X-750 IGA Testing. Intergranular attack (IGA) tesdng per E50YP11 shall be performed after annealing for each heat and heat treat lot. IGA examinadon is not required if a minimum of 0.030 inch of material is removed from all surfaces of the product form after final heat treatment. IGA examination is not required after age hardening.

3.2.1.5X-750 Ace Hardening. Ni-Cr-Fe alloy X-750 shall be age hardened at 1300 15*F for 20 hour2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> minimum and air cooled in accordance with P10JYP2D, and a buyer approved procedure.

Age hardening may be performed before or after machining as long as the final part meets all dimensional requirements.

l 3.2.2 Austenitic 300 Stainless Steel. Austenitic 300 series stainless steel shall be in accordance l with ASTM A-479, A-182 or A-240 type 304,304L,316 or 316L with a maximum carbon content of 0.020 percent. The type and applicable ASTM specification shall be as specified on the specific part drawing. The additional requirements below also apply.

3.2.2.1 Austenitic 300 SST Heat Treatmen1. Austenitic 300 series stainless steel shall be solution

! annealed at 2000 100*F (metal temperature) for a minimum of 15 minutes per inch of l thickness, but not less than 15 minutes total, immediately followed by quenching in circulating water to a temperature below 400*F. The solution anneal shall be performed after completion of final reduction, sizing, and straightening operations. Solution annealing shall be performed in

! accordance with qualified procedures approved by the buyer and shall meet the following l requirements; l

l a. Parts and any fixtures used in the heat treatment shall be visibly clean prior to heat treatment

b. All surfaces shall appear reasonably bright and clean after heat treatment and shall meet buyer approved limits for oxide discoloration.

c. Solution heat treated parts shall be tested by demonstrating with a mockup that the temperature is obtainable at a location in the center thickness, farthest from all heated surfaces or perform testing in accordance with E50YP11 and E50YP20.

3.2.2.2 Austenitic 300 SST Sensitization. All Austenidc 300 series stainless steel shall have sensitization testing performed for each heat and heat treat lot in accordance with the l

requirements of E50YP20, or by ASTM A-262 Practice E if no welding will be performed on the part. Sensitization heat treatment shall be at 1250 i25"F for one hour followed by 930 i 25*F for twenty four hours. Successful completion of the sensitization testing shall be accepted as evidence of the correct solution heat treatment,if time and temperature charts are not available.

3.2.2.3 Austenitic 300 SST IGA Testing. Intergranular attack (IGA) examination shall be performed for each heat and heat treat lot in accordance with the requirements of E50YP11. IGA examination is not required if a minimum of 0.030 inch of material is removed from all surfaces of the product form after final heat treatment.

gg 25A56 0 SH NO. 6 3.2.2.4 Austenitic 300 SST Hardness. The maximum hardness of austenitic 300 series stainless steel material and completed parts shall be R,90 for type 304, R,88 for type 304L, and R,92 for types 316 or 316L.

3.2.3 XM-19 Stainless Steel. Type XM-19 stainless steel shall be in accordance with ASTM A-479, A-182, A-412 or A-240. The maximum carbon content is limited to 0.040 per cent. The applicable ASTM specification shall be as specified on the specific piece part drawing. The addidonal requirements below also apply.

3.2.3.1 XM-19 SST Heat Treatment. XM-19 stainless steel shall be solution annealed at 2000*F 50*F (metal temperature) for 15 to 20 minutes for each inch of thickness, but for not less than 15 minutes regardless of thickness. The material shall be quenched in circulating water to a temperature below 500*F. As a vendor option to avoid distortion, the de rods may be forced- air cooled so that the metal temperature is below 500*F within 20 minutes of removal from the furnace. The solution anneal shall be performed after completion of final reduction, sizing, and straightening operations. Re-solution anneal of critical, highly stressed, machined areas such as tie rod threads need not involve the entire part, but can be limited tojust the newly machined  ;

portions.  :

3.2.3.2 XM-19 SST Sensitization. Each heat and heat treat lot of XM-19 material shall be tested for sensitization in accordance with the requirements of E50YP20 or ASTM A-262 Practice E.

Sensitization heat treatment shall be at 1250' 125'F for one hour followed by 930 i 25 F for twenty four hours. Successful completion of the sensitization testing shall be accepted as evidence I of the correct solution heat treatment,if time and temperature charts are not available.

3.2.3.3 XM-19 SST IGA Testine. Intergranular attack (IGA) examination shall be performed for each heat and heat treat lot in accordance with the requirements of E50YP11. IGA examination l is not required if a minimum of 0.030 inch of material is removed from all surfaces of the l product form after final heat treatment.

3.2.3.4 XM-19 SST Hardness. The maximum hardness of XM-19 stainless steel material and completed parts shall be R,100.

3.3 Cutting. Formine. and Cleaning 3.3.1 Mechanical Cuttine Methods. Methods such as machining, grinding (see also paragraph 3.6) and sawing are acceptable. Methods such as shearing or punching that form a hardened l layer on the metal surface shall not be used, except where the cold-worked material is subsequently and completely removed by machining, grinding, or solution heat treatment.

3.3.2 Thermal Cutting Methods. Plasma arc cutting may be used with the following restrictions:

Interpass temperature control shall be in accordance with P50YP102 for stainless steels. If a minimum of 0.12 in of the cut surface is subsequently removed by machining or grinding, the 1

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g g g g- 2 670 SH NO. 7 interpass temperature control is not required. Surfaces shall be machined or ground to a bright metal finish following the cutting operation. Preventive measures shall be taken to assure that '

spatter will not enter areas that are inaccessible to cleaning operations.

3.3.3 Ilendinc and Formine Control for Stainless Steel. There shall be no cold forming, bending, or cold reduction for austenitic stainless steel, unless otherwise specified in the paragraphs below, or unless the component is subsequently solution heat treated.

3.3.4 Prohibited Processes. Processes such as shot peening, hammering, or power deslagging of final surfaces are prohibited.

l 3.3.5 Straichteninc. Straightening or reforming shall be performed in accordance with an l approved procedure.

3.3.6 Control of Deformation. For parts that are straightened, reformed, or otherwise subjected to deformation as part of the normal fabrication process, the following controls shall be met: (1)

Hardness of any wrought stainless steel in the final fabricated condition shall not exceed the hardness requirements of paragraphs 3.2.2.4 and 3.2.3.4 as determined by an approved procedure. The buyer approved procedure shall include the specification of locations for hardness testing. The hardness shall be measured with a test device specifically designed to perform Rockwell B measurements for all materials. (2) Cold bending strain, after solution annealing, shall be limited to two and one-half percent maximum.

3.3.7 Cleanine and Control of Miscellaneous Process Materials. Miscellaneous process materials include such things as machining lubricants, liquid penetrants, solvents, tapes, ultrasonic testing couplant, abrasive grit, packing materials, marking materials, weld spatter compounds, and other materials which will be in contact with the part being fabricated. All miscellaneous process materials shall be controlled to prevent contamination of stainless steel and Ni-Cr-Fe materials. l The known contaminants of concern are chlorides, fluorides, sulfur, lead, mercury and all metals with low melting points. In addition, when welding or heat treating is involved, all carbonaceous material and phosphates must be considered harmful on stainless steel which can pick up these j

contaminants. Parts may be cleaned in accordance with P50YP211 as one method to control contamination.

3.4 Heatine Control for Stainless Steel. Austenitic stainless steel shall not be heated above 800 F l except by welding or thermal cutting unless the process will be followed by solution heat treatment.

3.5 Metallographic and Microhardness Evaluation. Machined components that are l not solution annealed after machining shall have metallographic and microhardness evaluation l on test samples per equirements of 2.2.Sh. Samples shall be provided from the same material, same fabrication shop and using the same process variables.

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gg 2 670 SH NO. 8 3.5.1 Cold Work Depth The total depth of surface cold work determined by metallography and microhardness shall not exceed 0.003 inches. The heavily deformed, featureless surface layer shall not exceed 0.0003 inches in depth.

3.5.2. Cold Work Surface. Depth of cold work shall be reported based upon severely deformed surface layer plus . ear surface cross-slip ok curvature of twin boundaries. Microhardness measuremen.s in senes from surface (first indication within 0.001 inch of surface) to sufficient depth to demonstrate when hardness is equal to bulk hardness. Data shall be reported in  :

microhardness units and converted to Rockwell C or B units. l l

j 3.6 Control of Grinding. Where possible, grinding shall be performed prior to any solution heat l l

treatment. Grinding should be restricted to instances required by fit-up or nondestructive testing needs. Where practical, machining should be used in place of grinding (see also paragraph l 4.6.2). If grinding is not followed by solution heat treatment or machining. the ground surface l shall be polished to an RMS 32 finish or better using successively finer grit abrasives.

3.7 Repair Not Requiring Welding. Minor surface grinding or machining, without subsequent I weld repair, may be performed to remove surface defects or to change contour provided the j l following conditions are met:

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a. The thickness of the section is not reduced to less than minimum required thickness.

b. The depression or ground area is blended uniformly into the surrounding surface with not less than a 4 to 1 taper.

c. After final grinding or machining, examine the surfaces by liquid penetrant to ensure that no unacceptable defects remain to demonstrate process capability.

d. Grinding or machining processes shall not introduce unacceptable surface coldwork or hardness in machining process qualification samples evaluated.

l 3.8 Electronolishing. When electropolishing is specified by the detail part drawing, a buyer i approved procedure shall be used. Electropolishing shall remove any suspected cold-worked surface after all mechanical cutting is completed. The process shall use mixed phosphoric / sulfuric acid.

3.9 Final Surfaces. All nicks and scratches are to be removed. Surface finishes shall be uniform in appearance.

3.10 Shop Applied Practices. The buyer's specification Y1010A3, "Sh m .ipplied Practices", shall

be considered an integral part of the fabrication drawings, and bc so implemented during fabrication and inspection.

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I ggg 670 SH NO. 9 3.11 Identification and Markinc. Finished parts shall be marked as specified on the detail product drawings. Low stress interrupted dot stamping is an acceptable method of marking.

Parts which are too small for practical marking may be idendfied by individual bagging and tagging.

4.0 WELDING 4.1 General. Welding requirements for 300 series stainless steel are included in this section as a repair contingency. Buyer approwi hall be obtained prior to making repairs invohing welding.

4.2 Weldine Filler Materials 4.2.1 Certification. A certified chemical analysis shall be obtained for each heat or lot of welding filler metal to be used.

4.2.2 Weld Filler Material. Welding filler materials shall conform to the requirements of the applicable welding process specificadon (see paragraph 4.2.4). )

4.2.3 Filler Material Control and Storage Welding materials shall be controlled in such a manner that it can be proven which heats of material were used for component fabricadon. All welding filler materials shall be stored, issued, and handled in a manner that assures that filler materials are dry, clean, identified undl consumed, and that the proper filler metal was used. A written i procedure shallinclude procurement, baking, storage, issue, use, and return to storage of unused j welding filler materials. l 4.2.4 Allowed Filler / Base Metal Combinations The allowable welding filler metal types for the i given base materials shall be in accordance with the welding process specifications listed below:

Base Material Process Soecification

a. 300 Series Austenitic Stainless Steels P50YP102 4.3 Backing Bars and Strans. All backing materials such as bars and straps shall have the same requirements as the base materials or, where complete removal is assured, backing materials shall l meet the chemistry requirements (as a minimum) of the base material.

4.4 Temocrary Attachments. Temporary welded attachments shall meet the chemistry requirements of the base material, or shall be carbon or low alloy steel buttered with a minimum of two layers of weld deposit utilizing filler metal in accordance with paragraph 4.2.2 unless otherwise specified.

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gg 670 SH NO.10 4.5 Shielding Gmes. Shielding gases shall be welding grade argon or mixtures of argon with helium or hydrogen.

4.6 Oualification for Welding. All welding procedures and welders shall be qualified in accordance with ASME Secdon IX 1989 Edition.

4.6.1 Fillet and Partial Penetration Welds. Fusion requirements for pardal penetration and fillet welds with less than 90* included angle shall be demonstrated by approved test welds.

4.6.2 Control of Grindine. For procedure or welder qualification, the test assembly weld joint shall be welded in strict accordance with the approved welding procedure with no added precautions which will not be used in production. Excessive grinding to overcome poor welding technique shall be unacceptable. Grinding shall be used only for dressing of starts, stops, occasional reshaping of beads for accessibility, smoothing of surfaces prior to required penetrant examinations, and smoothing of final surfaces. Each case of grinding for accessibility shall be specifically approved by the responsible welding engineer and so noted in the records. Adequate supervision shall be provided to assure adherence to these requirements. The requirements of Sections 3.6 and 3.7 apply.

4.7 Welding 4.7.1 Weld Symbols and Definitions. Interpretation of weld symbols shall be in accordance with AWS A2.4 and definitions in accordance with AWS A3.0.

4.7.2 Welding Process Specifications. All welding shall be performed to the requirements of this specification and P50YP102.

l 4.7.3 Welder Identification. A welder identification system shall be employed such that records are available showing the person (s) welding eachjoint.

4.7.4 Welding Procedures. All welding including temporary attachments and their removal shall be performed in accordance with approved detailed written welding procedures. Welding l procedures shall contain all essential and non<ssential variables listed in ASME Section IX and l

shall contain the additional requirements of this specification, as applicable. i 1

4.7.5 Alienment. Unless otherwise specified, alignment of sections shall be such that the maximum offset of the finishedjoint will not be greater than 1/8-inch or 1/4 T, whichever is less, where T is the thickness of the thinner base material. Alignment of sections atjoints for single welded full-penetration groove welds shall be such that the maximum offset at any point shall not exceed 0.045 inch at the root side. All final dimensional requirements for the component or assembly shall be maintained.

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l' ggg 670 SH NO.11 4.7.6 Arc Strikes. Arc strikes on stainless steel surfaces shall be removed, verified by visual and penetrant examination, and weld repaired, if necessary. The final surface of weld repairs shall be inspected byliquid penetrant.

5. QUALTIYASSURANCE 5.1 Submittals. Submittal requirements shall apply to the Fabricator and the Fabricator's subcontractors. The Fabricator shall be responsible for all submittals including those of the Fabricator's subcontractors. If any changes are made to the submittals, the Fabricator shall send revisions to the Buyer.

5.1.1 Reauired Submittals. The following items shall be submitted to the Buyer for approval prior to use:

a. Bending and forming procedures

b. Heat treating procedures

c. Welding procedures (including repair procedures) and welding procedure qualifications

d. Nondestructive examination procedures

e. Packaging procedure l

l f. Results of the metallographic and microhardness evaluation of fabrication induced surface cold work in samples evaluated, that are not solution annealed after final fabrication.

Samples shall be provided from the same material , same fabrication shop and using the same process variables.

g. Sampling procedures used to produce process capability test samples and finished parts.

5.2 Material Control. Material shall be controlled within the fabricator's shops under a quality l assurance program which has been determined by survey / audit to meet material traceability and l safety grade manufacturing practices as required by the Code of Federal Regulations 10 CFR 50, Appendix B, and 10 CFR, Part 21.

5.3 Inspection and Tests. All materials, part final surfaces, and welds (if any) shall be inspected for quality and cleanliness prior to the last operation which results in inaccessibility. Following such inspection, measures shall be taken to prevent the entry of soils into inaccessible areas during subsequent fabrication steps.

5.3.1 Liould Penetrant Examination. All final part surfaces, except small inaccessible openings, shall be examined by the liquid penetrant method in accordance with E50YP22A, except that no

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gg 25A5670 REV.2 SH NO.12 FIMAL cracking is permissible and linear indications shall not exceed 0.063 inch in length. L.iquid 3 penetrant materials shall be in accordance with E50YP22 or buyer approved equivalent. Prosision j shall be made to avoid the entrapment ofliquid penetrant materials in any inaccessible areas.

j-5.3.2 Radiocraphic Examination. Radiographic examination shall be performed on all l structural welds, if any are allowed as a repair, in accordance with the ASME Code, Ardcle NG-5000 and acceptance criteria in accordance with Subarticle NG-5320. Acceptance standards and penetrameters shall be based on the final section thickness.

! 5.3.3 Ultrasonic Examination. Material shall be ultrasonically examined in accordance with ASME Code Subsection NG, paragraph NG 2540, or a buyer approved equivalent procedure.

j 6. PREPARATION FOR SHIPMENT z 6.1 General Requirement. Components fabricated to this specification shall be prepared and i packaged for shipment in such a manner that the components will not be damaged or lost by handling or environment during transit, in accordance with the document in Paragraph 2.2.5.b.

i i 6.2 Procedure. The Fabricator shall package the product in accordance with Buyer approved j procedures.

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6.3 Identification. The component (s), when prepared for shipment, shall be identified by the 1 purchase order number and other pertinent information in such a manner that component (s) identity shall be maintained during shipment. When more than one component is included in a

! crate or package, the marking on the packaging shall indicate the identity and quantity of all

{ parts.

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Enclosure 4 GENE Installation Specification,25A5615, Revision O

'YJuad Cities Units 1 & 2 - Shroud Stabilizer Installation" l

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