ML20198K562

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Rev 3 to Spec 2323-GS-901, General Welding Requirements for Shop Fabricated Equipment
ML20198K562
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 02/12/1975
From:
GIBBS & HILL, INC. (SUBS. OF DRAVO CORP.), TEXAS UTILITIES SERVICES, INC.
To:
Shared Package
ML20197J316 List: ... further results
References
FOIA-85-59 2323-GS-901, NUDOCS 8606040050
Download: ML20198K562 (8)
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Text

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' 1 i-i TEXAS UTILITIES SERVICES INC.

I AGENT FOR

. TEXAS UTILITIES GENEPATING COMPANY

! ACTING FOP DALLAS POWER S LIGHT COMPANY

, TEXAS ELECTRIC SERVICE COMPANY

! TEXAS POWER S LIGHT COMPANY i

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i l COMANCHE PEAK STEAM ELECTRIC STATION i NUCLEAR UNITS NOS. 1 &2 i

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j GENERAL WELDING REQUIREMENTS FOR' SHOP FABRICATED EQUIPMENT SPECIFICATION 2323-GS-901 REVISION - 3

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FEBRUARY 12, 1975 GIBBS S HILL, INC.

ENGINEERS, DESIGNERS S CONSTRUC'IORS NEW YORK, NEW YORK

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  • Specification 2323-GS-901

.t February 12, 1975 i Revision 3 -

COMMANCHE PEAK STEAM ELECTRIC STATION 4

GENERAL WELDING REQUIREMENTS EOR SHOP FABRICATED EQUIPMENT

TABLE OF bONTENTS

'l TITLE PAGE

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1. 0 SCOPE 1 i
2.0 CODE REQUIPIMENTS 1

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3.0 WELDING 1 I

3.1 PROCEDURES AND QUALIFICATIONS 1 .

3.2 PROCESSES 2 3.3 . DETAILS 2 4.0 FILLER MATERIAL 4 5.0 INSPECTION AND DOCUMENTATION 5 i

4 lI 6.0 HEAT TREATMENT S

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i Specification 2323-GS-901

! February 12, 1975 Revision 3 i Page 1 GENERAL WELDING REQUIREMENTS FOR SHOP FABRICATED EQUIPMENT

1.0 SCOPE i

' This Specification is intended to supplement the requirements for

, welding in accordance with the ASME Poiler and Pressure Vessel Code Sections I, III, and VIII, latest edition, the ANSI Code for

{ Power Piping B31.1, API 650, Welded Steel Tanks for Oil Storage API 620, Welded Low-Pressure Storage Tanks, and AWWA D100-73 (AWS D5. 2-73) Welded Steel Elevated Tanks, Standpipes and Rev.3

. Reservoirs for Water Storage latest edition, whichever is applicable. This specification shall also establish requirements for noncode welding of equipment to be supplied by a i fabricetor/ manufacturer. Fabricator / manufacturer is defined as

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the Seller or his subcontractor.

2.0 CODE REQUIREMENTS The fabricator / manufacturer involved with the construction of a

nuclear power plant and/or its components, parts or appurtenances which come under the jurisdiction of ASME Section III shall hold a certificate of Authorization or a Code Symbol Stamp appropriate 3 to that component. For nonnuclear components the fabricator and/or manufacturer shall 'have applicable Certificates of Authorization or Code Symbol stamp appropriate to applicable component. Code requirements will be specified in Section 3, Technical Specification.

I 3.0 WELDING q 3.1 PROCEDURES AND QUALIFICATIONS

a. Welding shall not be performed prior to the submittal and L approval of the fabricator /manuf acturer's qualified welding l procedures. Procedures shall be submitted to the Purchaser
j. for approval.
b. The fabricator / manufacturer's welding pro'cedures shall be

[ qualified in accordance with ASME Section IX and the special requirements of ASME Section III. These procedures shall

'. employ electrodes, filler metal and flux that will produce j as-deposited weld metal with physical properties and having p chemical analysis within the limitations of .the parent r

material , specification except as s.pecifically approved by the Engineer.

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Specification 23 23-GS-901 February 12, 1975 Revision 3

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c. The fabricators / manufacturers, welders and welder operators -

shall be qualified to the approved welding procedures within the requirements of ASME Section IX, if applicable.

d. The fabricator / manufacturer cannot transfer welding procedure and/or- welder performance qualification to another fabricator / manufacturer.

3.2 PROCESSES

, The following welding processes are permitted, provided satis-

, factory evidence of qualification is submitted and an approved

procedure is used

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a. Manual shielded-metal arc .
b. Gas tungsten arc (Manual and automatic)
c. Automatic submerged are d.

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Gas metal arc (Used only on carbon steel noncritical piping)

Other special welding processes may be used on approval by the Engineer. .

DETAILS 3.3 Contractor shall comply with the following:

a. Piping or components which are designated by the Engineer as

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Class 1 as defined in ASME Boiler and Pressure Vessel Code, Section III, or specified in Section 3, Technical Specification, shall have the root pass of circumferential I; butt welds deposited by the gas tunasten arc process with consumable inserts in accordance with an approved detailed welding procedure. Backing rings may be allowed by approval of the Engineer. Backing rings, if allowed, shall be removed l after welding and the inside of the root shall be examined by 1

magnetic particle or liquid penetrant inspections to

!. procedures and acceptance standards with aoplicable codes.

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b. Piping or components which are designated by the Engineer as classes 2 or 3 as defined in ASME Boiler and Pressure Vessel Code,Section III, and all other applicable welds, unless specified in the Technical Specification (Section 3) to which i this specification is appended, shall have root passes made l by gas tungsten are with metal added fo'r all circumferential butt welds made by the shielded metal arc process. Backing rings may be used for all circumferential butt welds made by shielded metal arc process only on prior approval t y the Engineer.

, ; c. Tack welds shall be visually inspected and the defective j welds removed by grinding. The sound-tack welds shall be cleaned and ground to a proper contour fcr fusion into subsequent weld passes. Tack weld procedures shall be in

, accordance with subsequent finish weld procedures.

d. Roll welding shall be done with the are maintained ahead of top center and pointed in the direction of rotation for the

'l root pass. Subsequent passes shall be welded with the are

  • maintained behind top center and pointed opposite the

'l direction of rotation. .

e. For vertical welding, the progression shall be uphill. Down-l hill welding will be allowed only as defined in ASME Section IX for both code and noncode equipment.

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f. The number, sequence of passes 'and' the electrode diameter l; shall be substantially as shown in the detailed welding i'

procedure as approved by the purchaser and submitted by the fabricator / manufacturer.

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/ g. The maximum individual. layer. thickness for submerged arc i welds shall not exceed 1/2-inch for materials 1-1/4-inch I

thick- and greater, and 3/8-inch for materials less than 1-1/4-inch thick.

h. Submerged arc welds in alloy steels shall be made using an alloy wire and neutral flux.

It i. Longitudinal welds by the submerged are weldina process shall be made with removable starting and stopping tabs.

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j. Peening shall not be used without prior approval by the Engineer. Under no circumstances shall poening be allowed on the root pass or the cover pass unless the weld is postweld heat-treated. .

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Specification 2323-GS-901 February 12, 1975 j

Revision 3 Page,4 k.. An internal inert gas purge shall be used for gas tungsten are welding of alloy steels. The purge shall be maintained until a sufficient thickness of weld metal has been i deposited. This deposit shall not be less than the thickness l of the root pass and one (1) subsequent layer of weld metal.

Upon. completion of welding, TIG process plugs or dams shall be removed and necessary bookkeeping by the fabricator /manufact urer shall attest to the above fact.

Records shall be made available on request of the Purchaser for inspection and review.

.; 1. Weld contours in ASME Code Class 1 and 2 components that will i

' require subsequent inservice inspection in accordance with Section XI of the code, shall meet the following additional requirements-

1. The weld crown shall be flat topped with the transition between the weld crown and base material having a blend radius of not less than 0.5 inch. .

,, 2. Both the weld crown and adjacent base material shall

. have a surface finish of 250 - RMS or better. This surface should extend a distance of twice the pipe wall lRev.3 plus 2-inches on. both sides of weld possible.

the whenever 4.0 FILLER MATERIAL Fabricator / manufacturer shall comply with the following:

a. Unless otherwise approved by the Engineer, all shielded metal-arc welding shall be done using low hydrogen type electrodes.

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b. Filler . metal including consumable inserts for all components as defined by ASME Code Section III for stainless steel welds shall be select ed and cont rolled to produce welds in accordance with the USAEC Regulatory Guide 1.31 Control of Stainless Steel Welding. For all other components, filler metal, including consumable inserts, for austenitic stainless steel welds shall be selected and controlled'to produce welds which contain between 5 and 12 percent delta-ferrite for wrought structures and between 5 and 15 percent delta-ferrite for duplex cast structures as determined by the Schaeffler Diagram or magnetic ferrite indicator.

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3 Specification 2323-GS-901 i

February 12, 1975 Revision 3

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c. The receipt, storage, baking, dying and disbursal of all welding filler metals shall be maintained under strict control to ensure that all welds conform fully to specification requirements of the welding materials.
d. The fabricator / manufacturer shall establish a documen~tation procedure to describe the method used to control the receipt, testing, storage, heat number traceability, baking, dryina and disbursal and deposition of all welding filler metals employed in the construction of equipment designated as ASME

] Section III, Class 1, 2, 3 and MC components by the Engineer.

i . This filler metal control procedure shall be submitted to the 7 Engineer for review and approval prior to initiating any welding on Class 1, 2, and MC components.

e. The fsbricator/ manufacturer of- equipment not designated as ASME Section III, Class 1, 2, 3 and MC components in paragraph 4.0.d shall submit his procedure for control of filler material for approval prior to start of manufacture.

i 5.0 INSPECTION AND DOCUMENTATION All testing and' examinations of welds shall be performed and j documented as defined in the fabricator / manufacturer's approved Quality Assurance Manual as required by ASME Sect:on III for applicable equipment.

All other testing and examinations of welds shall be performed and documented as defined in the contractor's Quality Assurance Manual which shall be approved by the Fngineer prior to acceptance.

6.0 HEAT TREATMENT Lj Preheat and postheat treatment of welds shall be in conformance with the applicable codes and as detailed in the fabrich tor /manuf acturer's approved qualified welding procedures when applicable.

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  • SECFION 3 W

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' APPENDIX 2 il -

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. SPECIFICATION 2323-GS-900 PAINTING REQUIREMENTS FOR MECHANICAL EQUIPMENT m

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