ML20214F038
| ML20214F038 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/05/1986 |
| From: | AFFILIATION NOT ASSIGNED |
| To: | |
| References | |
| OL-A-176, NUDOCS 8705220380 | |
| Download: ML20214F038 (9) | |
Text
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SUMMARY
OF CHANGES IN WELD DISCREPANCIES AND DISCREPANT WELDS 87 IFR 22 P6:29 crF:
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THE CHANGES
- RESULTING FROM THE OCTOBER 1986 RECOUNT OF WELD DISCRE-PANCIES AND DISCREPANT WELDS ARE SUMMARIZED BELOW:
M DISCREPANCIES DISCREPANT WELDS C0H 1
1 CBP
-1 0
CPH 265 343 EIN 159 67 APPROXIMATELY 70% OF THE CHANGES IN THE WELD DISCREPANCIES IN
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THE CPH CONSTRUCTION CATEGORY ARE DUE TO THE 6 TYPICAL SITU-ATIONS ILLUSTRATED ON PAGES 2-7.
APPROXIMATELY 65% OF THE CHANGES IN THE EIN CONSTRUCTION CATEGORY ARE DUE TO THE 2 TYPI-CAL SITUATIONS ILLUSTRATED ON PAGES 8 AND 9.
l THE REMAINING CHANGES ARE DUE TO A VARIETY OF REASONS, INCLUDING CLERICAL ERRORS.
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'THE CHANGES DESCRIBED REPRESENT THE DIFFERENCES BETWEEN THE OCTOBER 1986 RESULTS AND THE VALUES WHICH APPEAR IN INTERVENORS Ex. 141, DATED SEPTEMBER 9, 1986.
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i UNDERCOUNTING SIMILAR DISCREPANCIES DUE TO ENVELOPING CALCULATIONS S&L DRAWINGS GENERALLY SPECIFY TYPICA'L CONNECTION DETAILS FOR VARIOUS CONNECTIONS ON A COMPONENT.
BCAP IDENTIFIED SIMILAR DISCREPANCIES ON VARIOUS TYPICAL CONNECTION DETAILS.
FREQUENTLY, S&L CALCULATIONS ENVELOPED SUCH DISCREPANCIES TO SAVE ENGINEERING COSTS.
INITIAL COUNTS - S&L SOMETIMES COUNTED ONLY THE SPECIFIC DISCRE-PANCIES ADDRESSED IN THE ENVELOPING CALCULATIONS.
OCTOBER 1986 COUNT - S&L COUNTED ALL DISCREPANCIES.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 20% OF Tile NET CHANGE FOR WELD DISCREPANCIES IN THE CPH CONSTRUCTION CATEGORY.
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PdRTIOAS OF WELD ON
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STRUT MEMBERS AS BUILT AS SPECIFIED
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TYPICALLY THESE ARE SYSTEMS CONTROL WELDS.
THE S&L DRAWINGS CALL FOR THE OUTSIDE PERIMETER OF THE STRUT MEMBER To BE WELDED TO THE ATTACHMENT PLATE.
BCAP OBSERVATIONS FREQUENTL'r SHOW THAT l
THE WELD DOES NOT EXTEND COMPLETELY ACROSS THE TOP OF THE LIP OF THE STRUT MEMBER.
INITIAL COUNTS - IN MID-1984 AT BYRON, S&L DETERMINED THAT IF l
THE WELD EXTENDS AT LEAST TO THE CENTERLINE OF THE LIP OF THE STRUT, IT IS ADEQUATE.
THIS IS THE CRITERION WHICH WAS USED IN THE S&L AND LKC WALKDOWN OF CABLE PAN HANGERS IN 1985.
IN COUNTING BCAP WELD DISCREPANCIES SOMETIMES S&L TREATED UNDERLENGTH WELDS WHICH REACHED THE CENTERLINE AS DISCREPANT CONDITIONS, l
SOMETIMES NOT.
OCTOBER 1986 - S&L ALWAYS TREATED ANY AMOUNT-0F UNDERLENGTH IN THE WELD AS A DISCREPANT CONDITION.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 15% OF THE NET f
CHANGE FOR WELD DISCREPANCIES IN THE CPH CONSTRUCTION CATEGORY.
PAGE 3
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DV-2 CONNECTION UNDERSIZE WELDS 5"
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AS-DESIGNED:
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TYPICALLY THESE ARE SYSTEM CONTROL WELDS.
S&L DRAWING 20-E-0-3263, REV. W ACCEPTED AS-BUILT CONDITION GENERICALLY ON 9/23/83.
BCAP DID NOT INVALIDATE THIS CONDITION.
INITIAL COUNTS - S&L SOMETIMES TREATED THIS AS DISCREPANT CONDITION -
SOMETIMES NOT.
OCTOBER 1986 COUNT - ALWAYS TREATED AS DISCREPANT CONDITION THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 15% PERCENT OF NET CHANGE FOR WELD DISCREPANCIES IN THE CPH GONSTRUCTION CATEGORY.
PAGE 4
f DV-1,2,4 85-UNDERLENGTH WELDS i
AS-DESIGNED AS-BUILT :
Q (MAIN BUILDING STEEL
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- GUSSET PLATE (UNDERLENGTH DUE 1
TO EXCESSIVE GAP '
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I/8 I/8 STRUT MEMBER TYPICALLY THESE ARE SYSTEMS CONTROL WELDS.
THE S&L DRAWINGS SPECIFY A FULL-LENGTH WELD BETWEEN THE GUSSET PLATES AND THE STRUT MEMBER AND SHOW A DIMENSION FOR THE GAP BETWEEN THE STRUT MEMBER AND THE MAIN BUILDING STEEL.
THE BCAP OBSERVATIONS SOMETIMES INDICATE THAT THIS WELD IS UNDER-LENGTH.
OTHER TIMES THE OBSERVATIONS MERELY INDICATE THAT THE GAP BETWEEN THE STRUT MEMBER AND THE MAIN BUILDING STEEL EXCEEDS THAT CALLED FOR IN THE DRAWINGS (WHICH IMPLIES THE WELDS BETWEEN THE STRUT MEMBER AND THE GUSSET PLATES ARE UNDERLENGTH).
INITIAL COUNTS - SOMETIMES S&L IDENTIFIED THESE AS UNDERLENGTH WELDS, SOMETIMES NOT.
OCTOBER 1986 C0uNT - S&L IDENTIFIED THESE AS UNDERLENGTH WELDS.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 10% OF THE NET CHANGE IN THE CPH CONSTRUCTION CATEGORY..
PAGE 5
DV-14, DV-19 GUSSET PLATE - COPE GUSSET PLATE HAS BEEN COPED TO CLEAR WELD ON PLATE MAIN BUILDING STEEL
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GUSSET PLATE WELDS ARE UNDERLENGTH DUE VERTICAL MEMBER TO THE COPE ON THE GUSSET PLATE AS-DESIGNED:
AS - BUILT:
S&L DRAWINGS CALLED FOR WELDS RUNNING THE LENGTH OF THE GUSSET PLATE.
BCAP OBSERVATIONS INDICATED THAT THE WELDS WERE "UNDER-LENGTH" DUE TO THE CONSTRUCTION COPE.
HOWEVER, A COPE IS REQUIRED TO INSTALL THIS DETAIL.
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INITIAL COUNTS - S&L DID NOT COUNT THESE WELDS AS UNDERLENGTH i
BASED ON A JUDGMENT THAT THE DETAIL COULD NOT HAVE BEEN INSTALLED IN ANY OTHER WAY, AND THAT THE WELD WAS NCT DISCREPANT.
- HOWEVER, THIS WAS IMPROPER BECAUSE BCAP HAD NOT INVALIDATED THESE DISCREPAN-CIES.
OCTOBER 1986 count - S&L COUNTED THESE AS WELD DISCREPANCIES.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATEIY 5% OF THE NET CHANGE IN THE WELD DISCREPANCIES IN THE CPH C.ONSTRUCTION CATEGORY.
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PAGE 6
AUXILIARY STEEL CONN.- OV.ERSIZE WELDS S-DESIGNED :
AS-BUILT m
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N.S. 8 F.S.g N.S. 8 F.S.gf 10 [
OF WT 'Y
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/3 OF WT o =-O",+k PER NOTE N.S. i NEAR SIDE F.S.
- FAR SIDE WT ' WIDE FLANGE TEE SECTION THE S&L DRAWING FOR THIS ITEM CALLS FOR 6S2 INCH FILLET WELDS WITH A MAXIMUM SIZE OF 9 62 INCH.
BCAP OBSERVATIONS SHOW THE SIZE OF THESE WELDS TO BE 1052 INCH.
INITIAL COUNTS - S&L DID.NOT COUNT THESE WELDS AS DISCREPANT BECAUSE, IN GENERAL, OVERSIZED WELDS ARE PERMITTED BY DESIGN DRAWINGS.
THIS JUDGMENT WAS INAPPROPRIATE BECAUSE BCAP HAD NOT INVALIDATED THIS OBSERVATION.
l OCTOBER 1986 COUNT - S&L COUNTED THESE OVERSIZED WELDS AS DISCREP-l ANT.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 5% OF THE NET CHANGE IN THE CPH CONSTRUCTION CATEGORY.
PAGE 7 l
1 USE OF GENERIC MOUNTING DETAIL IN LIEU OF UNIQUE MOUNTING DETAIL FOR EIN-114 t
S&L DRAWINGS SPECIFY GENERIC AND UNIQUE MOUNTING DETAILS FOR ELECTRICAL EQUIPMENT.
BCAP IDENTIFIED WELD SIZE DISCREPANCIES ON EIN-114, AND FURNISHED A WELD MAP SHOWING WELD SIZES.
INITIAL COUNTS - S&L COUNTED WELD DISCREPANCIES ON EIN-il4 BASED ON THE GENERIC DETAIL, WHICH SPECIFIED 1/8 INCH FILLET WELDS.
OCTOBER 1986 COUNT - S&L COUNTED DISCREPANCIES ON EIN-ll4 BASED ON THE UNIQUE DETAIL, WHICH SPECIFIED 1/2 INCH FILLET WELDS.
THIS RESULTED IN COUNTING ADDITIONAL WELD DISCREPANCIES.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 10% OF THE NET CHANGE FOR WELD DISCREPANCIES IN THE EIN CONSTRUCTION CATEGORY.
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PAGE 8 l
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EQUIPMENT HOLD-DOWN
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WELD PLAN 2-WELDS l-WELD V
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u SECTION: AS DESIGNED SECTION: AS BUILT SECTION: AS ANALYZED S&L DRAWINGS CALL FOR THE USE OF SHIM PLATES, AS REQUIRED, UNDER PIECES OF EQUIPMENT.
THE WELD BETWEEN THE EQUIPMENT AND THE SHIM AND THE WELD BETWEEN THE SHIM AND THE EMBEDMENT PLATE ARE SPECIFIED AS SEPARATE WELDS.
FREQUENTLY, BCAP OBSERVATIONS IDENTIFY ONLY ONE LARGE WELD ENTIRELY COVERING THE SHIM PLATE WITH A TYPICAL NOTATION " SHIM PLATE LOCA-TION INDETERMINATE."
IN ANALYZING FOR DESIGN SIGNIFICANCE, S&L MADE THE WORST CASE ASSUMPTION THAT THE SHIM EXTENDS TO THE FACE i
0F THE WELD.
INITIAL COUNTS - S&L TYPICALLY COUNTED THESE SHIM WELDS AS ONE WELD.
OCTOBER 1986 COUNT - S&L COUNTED THESE AS TWO SEPARATE WELDS, WHICH GENERALLY RESULTS IN MULTIPI'YING THE NUMBER OF IDENTIFIED
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WELD DISCREPANCIES BY TWO.
THIS SITUATION IS RESPONSIBLE FOR APPROXIMATELY 55% OF THE NET AGE 9 CHANGE IN THE EIN CONSTRUCTION CATEGORY.
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