ML20069A580
| ML20069A580 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/17/1981 |
| From: | Knight J Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20069A584 | List: |
| References | |
| FOIA-90-270 NUDOCS 8102270927 | |
| Download: ML20069A580 (14) | |
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r,0bert L. Tedesco, Assistant Director for Licensing Division of Licensing ThD":
Je ?s P. Knight, As;istent Director for Co-?onents end Structures Enginc2 ring Civi tion of Engins:-ring 5"MECT:
DL'iOAG THRCADDAR SYSTEM FOR SPLICIUG OF ?E!NFOP.CING STEEL F ARS - NIUE ;;1LE FDINT 2 M e nt ':t c:
!:ine 1;iie Point 2 rocket No.:
50 /.10 Licen:ing Stepe:
Post CP r.os;ensible Ortnch and Tr: Ject "cnt;er: Licensing tranch 1, i:enneth L. Kiper ht:ription of task:
E2 View of DY.!!DAG Threedbsr Systen for Splicing of I,cinforcing Steel Bars r.eview Status:
Completed Tefer:n es:
1.
Letter fror. Certid K. Ihode of Uiegara l'ohawk Poi,er Cert:retion (U!'#C) to L. S. P,udenstein of NP.C, rit.ted 0:tcie r 28,19PO.
2.
Letter from Gersid K. T,nede of IMPC to Tobert L. Tedesco of OC, d:ted October 23, 1980.
,:0 hcve revieu2d the tdditienal infor etion provided by the applicent in the it:end reference.
Dr. sed on this review, our earlier review of the fir:t referen:c, and the recting with applicent and its representetive en August 14,19B'), we recevand thtt the applicent be pernitted to use the DL'IDAG Thread Ear System for splicing of reinforcing steel bars, provided follo.*ing ccnditions are taet:
1.
C:.-;itnant to comply with the applicable provisions of Section 111, Division 2 of AS".E Eoiler and Pressure Yessel Code,1980 Edition, including sum.er addenda.
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Covlience with the e;plicable provisiens of Sacticns 7.S and7.6 of ACI Code 34c-76, ' Code P.ecuire ;nts for Nuclear Safety Related Concre te Structures'.
Prior to the use of unstegr.ared splices, provita fo11 cuing infernation to setstantiate and justify their use, Statistical sur. ary of test data schich substantiates that e.
the strain reasured over the full len$th of connector (at 0.9 yield) does rot cxceed that of an unspliced bar by nore than 50 percent; b.
Samle cciculaticos-irdiceting that =the stress levels in reinforcing tcrs are below 0.5 tires specified unter alli cpplicable load cc-binations for sc yield stren;th e of the 1ccetiens \\;here the use of unstaggered spitees is intenced.
These locations should include at least a typical joint situation, such as, stall floor junctions.
These calculations-should include cenplete analysis procedures and assurptiens used in arriving at the stress levels in reinforcing bars, and.
sl. etches shc. ting the c'etails of reinforcing; Tensile test dr.ta on *,pliced (unsteggcred) specinans ccnsisting c.
of grcup of bars to deternine their efficiency.
Preferably, the nurter cf tars in a group should be at least five.
These data should be provided for tar sizes 11,14, and 18.
Corpare the these results with sinilar unspliced spectrens.
The test shall be perforned and reported in accordence with Section CC-4333.2 of the chove rintioned AS"E code.
d.
The criterion for r.ininun t.recing betteeen the sleeves of atjecent bars and discuss its adecuacy in terns of concrete placenent, compection and avoidance of void formation.
Janes P. Knight, Assistant Director-for Cenonents and Structures Engineering Division of Engineering
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R. Yellner D]STRIBUT]DN F. Schauer J. i.nignt B. Youngblood.
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~ 'Tfeie6Ealion DWIDAG Threadbar Introduction Code F.equirc:ents Unstaggered Splices Statis tical Su-ary Calculatfor.s
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i Use of DWIDAG splices vill comply with,the requirements of Ast2 III Code, Division II and ACI 349.
Teit results have shown. chat the an:IDAG. splice meets the reqvf:ccents for unstaggered splices:
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1.
Strain over length of the full connector at 90% yield is less thanl50% of an unspliced bar.
2.- Multum computed design load stress in bar is less than.5 fy.
3.
Spli.us develop at least 125% of the specified yield i
strength of bar in tension.
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DWIDAG Threadbar, grade 60 tsi, Splice Syst ern Statistical Sun. mary of Elongation in a Spliced Ear Specir.en versus Elt.ption of an Unspliced Ear Speciren at.90% of tioitur required yield (54 ksi) rd el d%' i' h
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Elengation in 10 inch,
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Spliced Spectren 0.0245 0.0270 0.0230 0.0265 0.0250 0.0210 0.024 5 :a. u
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. spliced specimen 0.026 ',.vs1 o )
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Epliced specimen 0.037 0.0335 0.0365 0.033 0.032 0.031 0.0336 A 4
. spliced specimen 0.028L:: 1*D E in,%
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Elongation in 15 inch' Average Spliced I;cciren 0.038 0.0355 0.037 0.035 0.0365 0.039 0.0368 re.. ;.,
apliced E;ecir.en 0. 0 3 0 i * * *. ' ' )
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27 IS 23 17 22 30 23 (10 Elongation on 18 inch '
' Average Spliced Specinen 0.01.S5 0.047 0.0465 0.0!.95 0.0465 0.045 0.0471 5 A :!'
spliced specimen 0.035 C** * 'm E in %
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Average Spliced Specimen 0.0455 0.0475 0.039 0.0415 0.046 0.0395 0.0431 r^-is '
- spliced Speci':en 0. 0 3 4 ( ' 8 0 ' ')
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Elongation in 30 inch '
A'verage Sp specimen 0.0845 0.079 0.081 0.076 0,0845 0.052 0.0812 :-A 3 # "
- spliced Speciten 0.056 (4un'/ )
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MI:;IMd SiiCINd CRITEEIA TOR TPLICES 'IO'4YOID 70FJ'J. TION OF YOIDS DURING COSCRETE FLACEMENT:-
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THE C1. EAR DISTASCE EETWEEN F/JJ.LLEL $PLICES IN A LAYER SHA1.1 It 'NOT LESS TF.AN THE SOMINAL DIAMEITE OF THE BARS,
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-IS CASE OF CC:ORESSION ME!2ERS, THE CLEAR DISTANCE EETWEEN LCSCITUDISAl IAMS SP.S.LL NOT 1E LESS TRAN ONE A':D ONE EALT T1"IS THE SM !NAL EAR DI/. METER, UCR 11: IN.
~EE ALOVE CRITET.IA IS IN COMPL11d;CE WITH ACldt.9-76.
IN CASE OF NINE MILE Ini1T-2 PROJECT, THE !GN1?Ci CLEAR DISTANCE EE~".?IEN PARALLEL SPLICE WILL' IQT BE LESS THAN SU' TIMIS THE NOMINAL DU.'iETER OF THE EAR NOR 6 IN.
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1; u Dr<.*1DAG Threadbar Splice System (grade 60 ksi)- Contination _ of 6 - ('14 Splices Colu.hia University Test :o. S2637, March 14, 1950 tion;ation (in.) Load (K1F) Total Unspideed Sar E in-22 in, h2 43 i.' 4 83 5 06 (7 01 6X 0. 0 0 0-0 0 0 0 0 0 0.004 15 14 14 14 14 13 - 84 11 66 0.005-30 25 2S 2S 2S 26 168 22 132 0.012 44 40 42 40 42 39 -247 34 204 0.016 55 52 53 51 53 51 315 46 276 0.020 67 64 64 61 64 63 353 57 342 0.024 79-75 74 70 75 74 447 69 414 0.026 $9 S4 85 50 85 S3 506 S1 4S6 0.022 99 52 93 89 93 92 559 93 556 0.036 '107 101 101 97 101 101 60S 104 624 0.0;0 114 108 -105 105 109 IOS .652 !!4 6S4 0,044 121 -114 113 112 115 114 6E9 125 750 O.0;F 126 119 115 118 120 119 720 134 804 0.052 130 124 122 123 125 123 .747 140 340 0.056 134 128-126 12S 126 127 77) 140 840 -0.060-136 131 129 132 131 131 790 -0.064 137 134 131 135 133 134 800 0.06E 13S 136 133 136 136 137 818 0.072 138 137 134 138 138 13S 823 y 0.076 13S 13S 135 13S 135 139 826 0.050 13S 138 136 138 138 13S 827 Dyckerhof f'& Widma nn,Inc. DATE J.T c } SCALE DWG l APPROVED 6e(6t<I-
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