ML20083C415
| ML20083C415 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/16/1983 |
| From: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| GO2-83-1167, NUDOCS 8312230128 | |
| Download: ML20083C415 (5) | |
Text
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Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 99352 (509)372-5000 Docket No. 50-397 December 16, 1983 G02-83-1167 Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Subject NUCLEAR PROJECT 2 INSPECTION REPORT 83-38, NOTICE OF VIOLATION - CONCRETE Reference :
1)
Telephone Conversation of December 16, 1983, H. A.
Crisp (Supply System) with David Jeng and K. C. Leu (NRC) 2)
Letter #G02-83-839, dated September 16, 1983, C. S.
Carlisle to J. B. Martin This letter confirms the referenced telephone conversation between H. A.
Crisp, of the Supply System, and Messrs. David Jeng and K. C. Leu, of the Nuclear Regulatory Commission. The item discussed was the basis for a statement in the Reference 2) letter that the ACI Code 318-71, Paragraph 7.4.1, requirements for a minimum one-inch clear distance between layers of parallel bars were met in the case of beams 2B5, 2B11 and 2B25.
e Beam 2B5 - As-built cover-to-cover distances between the layers of bars are stated on the right-hand side of Section A-A, Sketch SK-2, Rev. 1.
The minimum worst case clearance is one inch, derived by subtracting 2-3/4" from 5-1/8" and further subtracting the nominal diameter of the #11 bar, which is 1-3/8"; which leaves a net clearance between the closest bars of one inch, b
Y uem m%
4 G
-Mr. A. Schwencer Page 2 r
e Beam 2B11 - This refers to Section B-B at the bottom center of Sketch SK-3, Rev.1. The Supply System fully excavated the first layer of bars, but only part of the second. layer because this excavation is in the maximum shear zone of the beam. The excava-
-tion was made~into the second layer of bars only to remove bad concrete in preparation for patching the beam. There were 16 bars exposed in the first layer of bars, including a bundle on the left side of the Sketch. This represents a total.of eight splices between tension bars in the beam and dowels froia the bioshield wall.. Likewise, splices are exposed in the second layer of steel on the right and left sides of the section.
Section B-B (SK-3) shows, on the right side, the nominal center-to-center distance between layers of bars to be 2-1/2".
Subtracting 1-3/8" nominal diameter of the #11 bars gives a clear distance between the bars of l-1/8".
Referring to the left-hand side, the clear center-to--
center distance between the closest bars is 4".
Subtracting 1-3/8" nominal diameter from the 4" leaves 2-5/8".
e Beam 2B25 - Referring to Section A-A on Sketch SK-4, Rev. 1.
The center-to-center dimensions between the two layers is shown on the right side of the Sketch, as 2-3/4".
Subtracting 1-3/8" nominal diameter from this distance leaves a clear distance between the
. bars of 1-3/8".
A ew G. C.
orensen, Mail Drop 340 Manager, Regulatory Programs HAC/fl
. Attachments:
-cc: Mr. R. Auluck, NRC Mr.'W. S. Chin, BPA Mr. D. Jeng, NRC Mr. K. C. Leu, NRC Mr. A. D. Toth, NRC. Resident i
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