ML20199A490

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: IA-85-313, Partially Withheld Transcript of Technical Review Team 840919 Interview W/Unidentified Person in Eagle Mountain,Tx Re Welding Activities ML17192A345 ML20199A477 ML20199A484 ML20199A490 ML20199A497 ML20199A503 ML20199A510 ML20199A517 ML20199A525 ML20199A531 ML20199A536 ML20199A543 ML20199A546 ML20199A553 ML20199A559 ML20199A564 ML20199A570 ML20199A575 ML20199A581 ML20199A586 ML20199A592 ML20199A599 ML20199A605 ML20199A613 ML20199A618 ML20199A624 ML20199A628 ML20199A633 ML20199A639 ML20199A645 ML20199A650 ML20199A657 ML20199A661 ML20199A667 ML20199A670 ML20199A678 ML20199A682 ML20199A688 ML20199A694 ML20199A705 ML20199A709 ML20199A715
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.

AGENT FOR 3

TEXAS UTILITIES GENERATING COMPANY ACTING FOR DALLAS POWER 6 LIGHT COMPANY TEXAS ELECTRIC SERVICE COMPANY TEXAS POWER S LIGHT COMPANY COMANCHE PEAK STEAM ELECTRIC STATION NUCLEAR UNITS NOS. 1 &2 1

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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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Specification 2323-GS-901 f-s

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February 12, 1975 Revision 1 Page 1 d

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 l

Reservoirs for Water Storage l'atest

edition, whichever is 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 31 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.

pro'edures shall be b.

The fabricator / manufacturer's welding c

qualified in accordance with ASME Section IX and the special rneci procedures shall rTqui1=ments or AsMz secn an 111.

L employ eieucroces, filler metal and llux that will produce 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 Revision 3 Page 3 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.

e d.

Roll welding shall be done with the are maintained ahead of

• top center and pointed in the direction of rotation for the root pa ss.

Subsequent passes shall be welded with the arc

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maintained behind top center and pointed opposite the

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direction of rotation.

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For vertical welding, the progression shall be uphill.

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hill weldina will be allowed only as defined in ASME Section II ror coth code and noncone equieumu-.

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The

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

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

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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.

f4 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 i

require subsequent inservice inspection in accordance with 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.

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Both the weld crown and adjacent base material shall have a surface finish of 250 - RMS or better.

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surface should extend a distance of twice the pipe wall s

plus 2-inches on both sides of the weld whenever

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possible.

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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 as defined by ASME Code Section III for stainless steel welds 9

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 which contain between 5 and 12 percent delta-f errite for a

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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 j

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.

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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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