ML20199A490

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Rev 3 to 2323-GS-901, General Welding Requirements for Shop Fabrication Equipment
ML20199A490
Person / Time
Site: Comanche Peak, 05000000
Issue date: 02/12/1975
From:
GIBBS & HILL, INC. (SUBS. OF DRAVO CORP.)
To:
Shared Package
ML17192A346 List:
References
FOIA-85-313, FOIA-85-59, FOIA-86-A-20 2323-GS-901, NUDOCS 8606120413
Download: ML20199A490 (6)
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TEXAS UTILITIES SERVICES INC.

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AGENT FOR TEXAS UTILITIES GENERATING COMPANY ACTING FOR l DALLAS POWER 6 LIGHT COMPANY ,

TEXAS ELECTRIC SERVICE COMPANY TEXAS POWER S LIGHT COMPANY COMANCHE PEAK STEAM ELECTRIC STATION NUCLEAR UNITS NOS. 1 &2 -

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  • 0 GENERAL WELDING REQUIREMENTS FOR SHOP FABRICATED EQUIPMENT

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SPECIFICATION 2323-GS-901 REVISION - 3 2

FEBRUARY 12, 1975 1

l GIBBS S HILL, INC. ,

ENGINEERS, DESIGNERS & CONSTRUCTORS

NEW YORK, NEW YORK I

l 8606120413 860604 PDR FOIA GARDE 86-A-20 PDR

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f-s Specification 2323-GS-901

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GENERAL WELDING REQUIREMENTS FOR I

SHOP FABRICATED EQUIPMENT 1.0 SCOPE This Specification is intended to supplement the requirements for welding in accordance with the ASME soiler 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 Rev.3 (AWS DS.2-73) Welded Steel Elevated Tanks, Standpipes and '

Reservoirs for Water Storage l'atest edition, whichever is l

, applicable. This specification shall also establish requirements for noncode welding of equipment to be supplied by a 4

fabricator / manufacturer. Fabricator / manufacturer is defined as the Seller or his subcontractor. e 2.0 CODE REQUIPEMENTS l

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( The fabricator / manufacturer involved with the construction of a nuclear power plant and/or its components, parts or appurtenances i which come under the jurisdiction of ASME Section III shall hold a Certificate of Authorization or a Code symbol stamp appropriate

to that component. For nonnuclear components the fabricator i 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 1 Technica_1 Spe'citication.

3.0 WELDING-L 3.1 PROCEDURES AND QUALIFICATIONS

a. Welding shall not be performed prior to the submittal and approval of the fabricator /manuf acturer's qualified welding

, procedures. Procedures shall be submitted to the Purchaser l for approval. .

b. The fabricator / manufacturer's welding pro'edures c shall be qualified in accordance with ASME Section IX and the special rTqui1=ments or AsMz secn an 111. rneci procedures shall produce L employ eieucroces, filler metal and llux that will as-deposited weld metal with physical properties and having chemical analysis within the limitations of the parent material specification except as specifically approved by the Engineer.

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('s Specification 2323-GS-901 February 12, 1975 Revision 3 Page 2 ,

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 i,s submitted and an approved ,

procedure is used:

a. Manual shielded-metal arc
b. Gas tungsten arc (Manual and automatic)
c. Automatic submerged arc s d. Gas metal arc (Used only on carbon steel noncritical piping) 1 Other special welding processes may be used on approval by the Engineer.

3.3 DETAILS Contractor shall comply with the following:

a. Piping or components which are designated by the Engineer as 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 butt welds deposited by the gas tungsten arc process with consumable inserts in accordance with an approved deta iled welding procedure. Backing rings may be allowed by approval of the Engineer. Backing rings, if allowed, shall be removed after welding and the inside of the root shall be examined by magnetic particle or liquid penetrant inspections to procedures and acceptance standards with applicable codes.

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Specification 2323-GS-901 77s i <! February 12, 1975

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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 this specifica' tion is appended, shall have root passes made by gas tungsten are with metal added for all circumferential butt welds made by the shielded metal are process. Backing rings may be used for all circumferential butt welds made by shielded metal arc process only on prior approval ty the Engineer.

. c. Tack welds shall be visually inspected and the defective welds removed by grinding. The sound-tack welds shall be cleaned and ground to a proper contour for fusion into subsequent weld passes. Tack weld procedures shall be in accordance with subsequent finish weld procedures.

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

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root pa ss. arc

(~ maintained behind top center and pointed opposite the direction of rotation.

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e. For vertical welding, the progression shall be uphill. D aow -

hill weldina will be allowed only as defined in ASME Section

, II ror coth code and noncone equieumu-.

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

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

g. The maximum individual layer thickness for submerged are welds shall not exceed 1/2-inch for materials 1-1/4-inch l thick and greater, and .3/8-inch for materials less than l 1-1/4-inch thick.
h. Submerged arc welds in alloy steels shall be made using an alloy wire and neutral flux.

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i. Longitudinal welds by the submerged are welding process shall be made with removable starting and stopping tabs.
j. Peening shall not be used without prior approval by the Engineer. Under no circumstances shall peening be allowed on the root pass or the cover pass unless the weld is postweld heat-treated.

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(eg Specification 2323-GS-901 February 12, 1975 Revision 3 4 Page 4

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k. An internal inert gas purge shall be used for gas tungsten arc welding of alloy steels. The purge shall be maintained

, until a sufficient thickness of weld metal has been deposited. This deposit shall not be less than the thickness l of the root pass and one (1) subsequent layer of weld metal.

l . Upon completion of welding, TIG process plugs or dams shall

be removed and necessary bookkeeping by the i fabricator / manufacturer shall attest to the above fact.

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

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1. Weld contours in ASME Code Class 1 and 2 components that will require subsequent inservice inspection in accordance with i

i Section XI of the Code, shall meet the following additional j requirements:

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

(h 2. Both the weld crown and adjacent base material shall have a surface finish of 250 - RMS or better. This Rev.3

} , surface should extend a distance of twice the pipe wall s

plus 2-inches on both sides of the weld whenever

) possible.

i l 4.0 FILLER MATERIAL

'i Fabricator / manufacturer shall comply with the following:

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

< , electrodes. )

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{ b. Filler . metal including consumable inserts for all components 9 as defined by ASME Code Section III for stainless steel welds shall be se lected and controlled to produce welds in accordance with the USAEC Regulatory Guide 1.31 Control of Stainless St eel Welding. For all other components, filler metal, inclufing consumable inserts, f or austenitic stainless

steel welds uhall be selected and controlled to produce welds a which contain between 5 and 12 percent delta-f errite for

? wrought structures and between 5 and 15 percent delta-ferrite

! for duplex cast structures as determined by the Schaeffler j Diagram or magnetic ferrite indicator.

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1 Specification 2323-GS-901 (5

February 12, 1975 Revision 3 Page 5

c. The receipt, storage, baking, [ying and disbursal of all welding filler metals shall be e 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 documentation 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 me tals 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 Engineer for review and approval prior to initiating any -

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- welding on Class 1, 2, and MC components.

e. The fabricator / manufacturer of equipment not designated as" ASME Section III, Class 1, 2, 3 and MC components kn ,

paragraph 4.0.d shall submit his procedure for control of filler material for approval prior to start of manufacture.

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5.0 INSPECTION AND DOCUMENTATION i

All testing and examinations of welds shall be performed and I

documented as defined in the fabricator / manufacturer's approved l Quality Assurance Manual as required by ASME Section III for

, applicable equipment.

l l All other testing and examinations of welds shall be performed and documented as defined in the contractcr's Quality Assurance Manual which shall be approved by the Engineer prior to

acceptance.

6.O HEAT TREATMENT Preheat and postheat treatment of welds shall be in conformance with the applicable codes and a r, detailed in the fabricator /manuf acturer's approved qualified welding procedures when applicable.

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