ML20210B014
| ML20210B014 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/13/1981 |
| From: | Scott B TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML20197F755 | List:
|
| References | |
| FOIA-85-59 QI-QP-11.14-3, NUDOCS 8601270323 | |
| Download: ML20210B014 (4) | |
Text
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i INSTRUCTION ISSUE
, TEXAS UTluTIES GENERATING CO.
NUMBER REVISICN DATE PAGE i
.QI-QP-11.14-3 1
AUG 17 1981 1 of 4 A
' PREPARED BY:
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INSPECTION OF
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APPROVED BY:
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i-1,'O REFERENCES
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i 1-A AWS D1.1-75, "Structu ral Welding Code"
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1-B WES-16," Welder Quali fication Ma trix" 1-C CP-CPM-6.98, " Weld Filler Material Control" 1-D QI-QI-11.14-1, " Inspection of Site Fabrication and Installation of Structural and Miscellaneous Steel" 1-E WES-029, "Wel ding Speci fica ti on for Field Fabrication and l
l Erection of Structural Steel" 1-F CP-QP-16.0, "Nonconfonnances and Deficiencies" 2.0 GENERAL 2.1 PURPOSE AND SCOPE The pu rpose of this instruction is to pr uiii.e w.i t H for vi sual inspection of welds in accordance with Reference 1-A j
on safety-related structural / miscellaneous steel other than l
l cable tray and conduit supports (which are governed by their own procedures).
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3.0 INSTRUCTION 3.1 WELDER QUALIFICATION VERIFICATION i
i The QC Inspector shall ve ri ff that the welder assigned to i
I pe rfonn the activi ty is qualified to the applicable pr i
ocedure by checking the Welde r Qualification Ma trix,
Reference 1-B.
3.2 SURVEILLANCE INSPECTIONS f
i The fol1owing randcri inspections shall be perfonned by the l
QC Ins pecto r.
The frequency of these inspections shall be I
detennined by the Quali ty Cont rol Supe rvisor or his j
designee.
8601270323 851212 f
TUGCC oA
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o INSTRUCTION ISSUE REVISION N
BER DATE PAGE TEXA3 UTILITIES GENERATING CO.
l CPSES j
- OI-0 P-11.14-3 1
AUG 17 1981 2 of 4 1
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3.2.1 FIT UP l
t On a ra nda, ba s i s, the QC Inspector shall ve rify the fol l owing:
a.
The weld joint su rfaces and approximately one inch adjacent to the weld shall be clean and fme of moistu re, rust, oil, grease, or any type of protective coating. Cleaning may be accanplished by wire brushing, filing, or grinding.
Oil and grease shoulo be mmoved l
by a st odda rti s 01 vent, " Va rs 01 ", or approved equal.
b.
Misma tch (for butt joints) does not exceed 1/8 inch.
c.
The gap between parts shall not exceed 3/16 inch and the weld size (leg length) shall be ir. creased by the amount of separation, d.
For butt welds, root gap is as specified on fabrication
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d rawi ng.
e.
Tack welds which am to be incorporated into the final weld meet acceptance criteria of Section 3.3.
Defective tacks shall be repaired or removed.
3.2.2 PREHEAT The QC Inspector shall randomly verify that preheit i, i, accordance with the applicable welding procedur1.
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should be measured wi th temperature indicating crayons or approved em,al.
3.2.3 WELD FILLER MATERIAL VERIFICATION i
The QC Inspector shall randanly verify that the welder is using electrodes properly issued in accomance with Reference 1-C.
3.3 FINAL VISUAL INSPECTION Af ter conpletion of welding, the QC Inspector shall verify that the welder has stamped the weld with his 10 symbol adjacent to the weld.
The welder ID shall be recort!ed on the IR.
The QC Inspector shall also inspect the weld for the following:
TUGCO OA
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i ISSUE INSTRUCTION REVISION PAGE 2
NUMBER DATE TEXAS UTILITIES GENERATING CO.
I CPSES j
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QI-QP-11.14-3 i 1
h0G 17 1981 3 of 4 l
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a.
All welds requi red by drawing are conpleted and that no addi tional welds have been addeo without approval of the Design Engineer.
b.
The welds are of.the size requi red by the drawing.
Fillet welds in any single continuous weld shall be pe rmitted to be 1/16" unde rsize wi thout correction l
provided that the undersize weld does not exceed 10 pe rcent of the length of the weld.
Welds shall not exceed the size specified on the drawing by more than i
3/32 inch.
Welds not meeting the size requi rements shall be reworked.
Those which are not reworked shall be reported in accordance with Section 3.8.
c.
Welds a re free of cracks, ove rla p, lack of f us i on,
and su rface porosity.
d.
Welds have required degree of penetration.
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e.
All c ra te rs a re filled to the full cross section.
f.
Unde rcut shall not exceed 0.01' inch deep when its di recti on is transverse to the primary tensile stress nor more than 1/32 inch in all other situations.
g.
For groove welds, the weld shall be conpleted to a level at least flush with the base metal and shall not be reinforced greater than 1/8 inch.
h.
Fillet weld profiles shall tie either sli;htly concave or convex.
The degree of convexi ty shall not exceed 0.1 times the leg length +.03 inches.
i.
The maximum bead width for a SMA weld, other than a fillet weld, shall not exceed 4 core wire diameters of the electrode being used.
The QC Inspector shall verify that unacceptable welds are repai red by removing the weld mate rial by grinding, machining, chipping, oxygen gouging, or air ca rbon a rc
- gouging, and the su rface thoroughly cleaned pri or to rewelding.
71JGCO CA
4 INSTRUCTION ISS E REVISION PAGE TEXAS UTILITIES GENERATING CO.
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CPSES lAuG 1, l
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,0I-QP-11.14-3 1
jg3; ; 4 of 4 i
4 NOTE:
The extent of weld metal c racks shall De
' ascertained by acid etching, NT, or other equally positive means. The weld metal shall be removed 2 inches beyond the end of the crack before rewel: ling.
Results of final visual examination shall be recorded on the IR (Re fe rence 1-0, ).
Ad di ti onally, the QC Inspector shall ma rk a "Q" on all j oints or pa rts inspected by him with a Nissen Ma rker, f
3.4 WELD REPAIR Weld repair shall be perfonned and documentea in accordance with Reference 1-E.
3.5 BASE METAL REPAIR Base metal damage wi thin designated all owable limits (in ASTM s peci fica tion) shall be repai red in accordance with
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existing site procedures.
3.6 DOCUMENTATION Results of all inspecti ons requi red by this ins tructi on shall be documented on an Inspection Report (Referince 1-0, ).
Resul ts of inspecti ons requi red in 3.2 shall be documented in conments section of the IR.
3.7 NONCONFORMANCES The QC Inspector shall report:
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a.
Major or delayed Cracks i
b.
Base metal de fects in excess of the allwable designated ASTM specification.
t c.
Deviations requiring revised design as nonconfonning in accordance with Reference 1-F.
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