ML18038A548
| ML18038A548 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/05/1981 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Dise D NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8103120642 | |
| Download: ML18038A548 (28) | |
Text
LJNITED STATES LEAR REGULATORY COMMISSIO WAsl<IMGTOM,t). C. 20555 NR 5 Docket Ho. 50-410 Hiagara Mohawk Power Corporation ATTN:
Hr. Donald P. Disc Vice President, Systems Project t~ianagement 300 Erie Boulevard West
'yracuse, Hew York 13202 In your letter, dated August 9, 1979, you requested our review and approval of the use of the DYWIDAG Threadbar System for splicing reinforcing bar in Category' st'ructures.
We have reviewed your request and the additional informatisn you
-'rovided by letters, dated June 17, 1980 and October 28, 2980.
Based on our
- review, we.have concluded that the use of the DYWIDAG Threadbar System is accept-able.provided the following conditions are met:
( 1)
Compliance with the applicable provisions of Section III; Division 2
'f ASNE Boiler and Pressure Vessel
- Code, 1980 Edition, including the Summer 1980 addenda;.
(2)
Compliance wi th the applicable provi sions of Section 7.5 and 7.6 of ACI Code 349-76, "Code Requirements for Nuclear Safety Related Concrete Structures".
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In addition, prior to the use of the DYWIDAG Threadbar System with unstag d
s lice p ', provide the following information for the staff's review.and approval:
uns aggere (3)
Statistical sunmary of test data which substantiates that the strain
- measured over the full length of the connector at 90% of yield does not exceed the strain of an unspliced bar by more than 50%;
(4)
Sample.calculations indicating that the stress levels in the reinforc-ing bars are below 50% of the specified yield strength under all applicable load conditions for some of the locations where the use of the unstaggered splices is intended.
These locations should include at least a typical joint situation, such as a wall-floor junction.
These calculations should include the complete procedures and assumptions used in the analysis to arrive at the stress levels in the reinforcing
~
bars.
Also provide sketches showing the details of the reinforcing; (5)
Tensile test data on spliced, unstaggered specimens consisting of a group of a least five bars to determine their group efficiency.
This
'ata is required for bar sizes 11, 14 and 18.
The group of bars should be arranged in a typical spacing as planned to be used in the contai nment and should be tested while imbedded in concrete.
Compare these results with similar unspliced specimens.
If a test in concrete
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~0 concrete.
is not feasible, provide adequate justification th t th ff a
e e
ectof ie. is minimal.
The test should be performed and re o,.t d
'accordance with n
reporte in code; Section CC-4333.2 of the previously mention d AS'"
e c
(6)
The criterion for minimum spacing between the sl f
d'ars and its ad e
s eeves o
adjacent i
s a equacy in terms of concrete placement, corn action and avoidance of void formation.
l'e require you to submit a commitment to comply w'th th d
-1' co es-isted in an (2) above and to receive the staff's approval of the result f-and. testing described in (3)
(4 e resu s
o analysis i
e in,'), {5) and (6), prior to your use of the DVYIDAG rea ar System in Category I StructuJes,........'~,gal);
B. J.
Youngblood, Chief Li nsing Branch'tlo.
1 Division of Licensing cc:
See next page a
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Niagara Mohawk Power Corporation Nine Mile Point Unit 2 Docket No.
50-410 Yresentation DY'4'IDAG Threadbar introduction Code Requirements Unstaggered Splices Statistical Sum-'.ary Calculations Spacing Criteria
E
I P Use of DYE'IDAG splices vill comply vith the requirements of AS?K III Code, Division II and ACI 349.
Test-results "have.shov~- -hat-the Mi'IDAG.splice meets the requirements for unstaggered splices:
1.
Strain over length of the full connector at 90% yield is less than 150% of an unspliced bar.
I 2.
Yiaximum computed design load stress in bar is less than.5 fy.
3.
Splices develop at least 125% of tne'pecified yield strength of bar in tension.
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DECI'rZHOF'F S, WIOMAee, leC.
DYWIDAG Threadbar, grade 60 ksi, Splice System Statistical Summary of Elongation in a Spliced Bar Specimen versus Elongation of an Unspliced Bar Specimen at.90% of minimum required yield (54 ksi) f/6:
Spliced Specimen Unspliced Specimen SilCeSS)
E in%
f/7:
Spliced Specimen Unspliced Specimen E in%
1~1~l i~
~
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Elongation in 10 inch 0.0245 0.0270 0.0230 0.0265 0
~ 0250
- 0. 0195
~o c:"
> '/ 3
'-..26- "-. -. -- -- IS. " "-..
28 Elongation in'2 inch 0.028 0.025 0.0285 0.028 0.027 Q.026 i.vc'LIb i'l) 8-
-4 10 0.022 26 Average
~ 0.0264 ~ Ii
-15 2-
,dales
.ao2<hio Average 0.0210
'0.0245 ov+ lu" 8.
SplicedSpecimen Unspliced Specimen E in%
Elongation 0.037 0.0335 0 '365
- 0. 0 28 (. o c x '<! Q 32 20 30 in 14 inch~
0.033 0.032 18 0.031 Average 0.0338 21 ll9 Spliced Unspliced E in Specimen Specimen Elongation 0.038 0.0355 0.037 0.030 i.>>~"i )
27 18 23 in 15 inch>
0 035 0.0365 17 22 0.039 30 Average 0.0368 ~.
23 l".10 Spliced Unspliced E in Specimen Specimen O/
33 Elongation 0.0485 0.047 0.0465 0.035 (I.Io-'.:.
~
39 34 on IS inch 0.0495 0.0465 41.
33 0.045 I
29 Average 0.0471 35
<<ll Spliced Unspliced E in Specimen Specimen ey Elongation 0.0455 0.0475 0.039 Q, Q34 (.00)~>'s.i) 34 '0 15 22 35 in 18 inch O.0415 O.O46 0.0395 16 Average 0.0431 ~ I=
27 Jl14 Spliced Specimen Unspliced Specimen Ein%
Elongation 0.045 0.050 0.051 0.042
(.avian"..)
7 19 21 in 22 inch
~
0.0505 0.0495 20 18 0.050 19.
Average 0.0493
=.W l.'I 17
>8 Sp iced Unspliced E in Specimen Specimen Elongation 0.0845 0.079 0.081
- 0. 056
( "-=C'"/ 0 51
'1 36 51 in 30 inch 0.076 0.0845 0.082 46 Average 0.0812 ~M 3o" s"(
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MINIMUM SPACING CRI'iE?XA FOR SPLICES
'fO AVOID FOR'STION OF VOIDS
- DURXNG CONCRFTE PLACEMENT:
1.
THE CLEAR DISTANCE BETWEEN'P3V3.LEL SPLICES IN A LAYER SH~J.I.
BE NOT LESS THAN THE NOMINAL DIAMETER OF THE BARS, NOR 1 IN.
2.
IN CASE OF COMPRESSION~
hZ?'GERS, THE CLEAR DISTANCE BETWEEN LONGITUDINAL BARS SHALL NOT BE LESS THAN ONE AND ONE HALF TIMES THE NOMINAL BAR DIA."jcTER, NOR lq XN.
THE ABOVE CRITERIA IS IN COMPLIANCE 4'ITH ACI-349-76.
IN CASE OF NINE 1~iILE UNIT-2 PROJECT, THE MINIMUM CLEAR DISTANCE BETh'EEN PARALLEL SPLICE VILL NOT BE LESS THAN SIX TIMES THE NOMINAL
'LQL~TER OF THE BAR NOR 6 IN.
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DY4'IDAG Threadbar Splice System (grade 60 ksi)
Combination of 6 Pll Splices Total Unspliced Bar 6X Columbia University Test No. 82636, Nay 7, 1980 IiAviJ~~~
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E in 18 in.
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- 0. 004 0.008 10 2Q 10 20 0
21
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13 25 66 131 0
0 10 60 20 120 0.012 0.016 30 40-29 36 32 43 33 43 40 35 191 30 180 247
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DV~IDAG Threadbar Splice.System (grade 60 ksi)
Combination of 6 i."14 Splices ColUmbia University Test iso.
- S2637, inarch 14, 1980 Eloni',ation (in. )
F. in 22 in.
/i3 i(4 Load (RIP) 86 87 Total Unspliced Bar ii1 6X Q.
0.004 0.008 0.012 0.016 0
15 14 14 14 14 44 40 42 40 42 52 51
.53 30 28 28 28 28 0
0 13" 84 26 168
'I 39 247 51 315 66 132 34 204 46 276 0.020 0.024 74 61 70 64 75 63 383 57
. 342 74 447 69 414 0.02S 89 S4 85 80 85 83 506 8),
486 0.032 0.036 0.0'0 0.044 0.048 0.052 0.056 0.060 0.064 0,068 0.072 0.076 0.080 99 93 107 101 114 108 121 114 126 119 F 130 124 134 128 136 131 137 134 138 136 138 137 138 138 138
- 138, 93 101 108 113 118 122 126 129 13) 133 134 135 136 89 105 112 118 123 128 132 135 138 138 138 138 93 101 109 115 120 125 128 133 136 138 138 138 92 559 101 608 10S 652 114 689 119 720 123 747 127 771 131 790 134 804 137 818 138 823 139 826 138 827 93 558 104 624 114 684 125 750 134 804 140 840 140 840 Dycket-hoff 8, Widrnann, inc.
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Kt K~ 41603 DYHlDAG Threadbar Splice System (grade 60 ksi)
Combination of 6
18 Splices Columbia University Test No. 82638, Hay 7, 1980 Flongation (in.)
E in 18 in.;:17 j<18
>'i29
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.'.l22 Total Unspliced Bar
/i23 6X 0.
0.010
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0 40 44 80 84 0
86 0
4'7 84 80 0
0 40 254 80 494 0
0 39 234 78 468 0.030 0.040 0.050 0.060 0.070 0.080 0.090 0.100 0.1'0 110 116 134.
144 118 143 122 150 156 174 192 210 232 238 116 114 696 116 698 136 144 854 155 930 194 1164 168 164 174 158 168 988 189 181 192 175 184 1095
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250 1500 250 1500 205 198 208 192 200 1195 214 220 211 213 1285 230 228 222 223 1351 217 226 233 240 233 232 232 1402 238 249 236 237 236 1434 0.120 0.130 0.140 0.150 240 242 244 245 244 250 239 242 240 1457 246 250 240 244 24 1 1465 247 250 240 245 242 1469 241 250 238 240 239 1448 Dyckerhoff 8, Widmann, Inc DATE ~-/=4'r SCALE APPROVED
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