ML20132C691
| ML20132C691 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, 05000000 |
| Issue date: | 02/01/1985 |
| From: | Lear G Office of Nuclear Reactor Regulation |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20132C642 | List: |
| References | |
| FOIA-85-161 NUDOCS 8502110092 | |
| Download: ML20132C691 (4) | |
Text
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UNITED STATES
'8 NUCLEAR REGULATORY COMMISSION n
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MEMORANDUM FOR:
Denn{Sa,fetyAssessment, s M. Crutchfield, Assistant Director for Division of Licensing THRU:
(JamesP. Knight,AssistantDirector for Components and Structures Engineering Division of Engineering FROM:
George Lear, Chief Structural and Geotechnical Engineering Branch Division of Engineering
SUBJECT:
TECHNICAL EVALUATION OF WOLF CREEK WELD INSPECTION PROGRAM
References:
1.
Memorandum for D. G. Eisenhut of NRR from R. P. Denise of Region IV " Request for a Technical Assistance Wolf Creek Generating Station DN-50-482" dated November 2, 1984.
2.
Meriiorandum to File from S. B. Kim of Structural and
- Geotechnical Engineering Branch, NRR, " Response to the Technical Assistance Request on Wolf Creek Weld Joints
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Inspection Program, dated November 19, 1984.
In response to.the above referenced technical assistance request (Reference
- 1) Mr. S. B. Kim of SGEB visited Bechtel in Gaithersburg on November 6 and 13, 1984, and as a result, a technical evaluation has been written (Reference 2). To followup an outstanding item during his November 13 trip, Mr. Kim visited Bechtel for the third time on November 27. Outstanding item discussed in Reference 2 concerns adequacy of welt overrun. A technical evaluation on this issue is enclosed (Enclosure 1).
The Reference 2 has been transmitted to Mr. L. Martin of Region IV on November 19, 1984, and attached here as.
George Lea Chief Structural and Geotechnical Engineering Branch Division of Engineering
Enclosures:
As stated.
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S. Kim
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S ENCLOSURE 1 TECHNICAL EVALUATION OF WELD OVERRUN WOLF CREEK WELD INSPECTION PROGRAM BY SANG B0 KIM STRUCTURAL AND GE0 TECHNICAL ENGINEERI.NG BRANCH DIVISION OF ENGINEERING 0FFICE OF NUCLEAR REACTOR REGULATION On November 27, 1984, the staff visited Bechtel facility located in Gaithers-burg, Maryland and met with Messrs. J. Ivany, G'. Brown, P. Corato, and N. Goel.
The purpose of the visit was to close out an outstanding item described in my previous report (Reference 2) in which it was noted that "Bechtel has agreed
- to perfonn calculations to provide further technical justification for dis-position of weld overrun. We expect to review the calculations when they become available...".-
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The calculations concern adequacy of the steel beam supports.
The beam support consists of a piate which is imbedded to the concrete wall by. anchor bolts and clip angles which are welded to the imbedded plate as well as to the beam web.
Original design of the beam support is to transmit only shear because it was designed as a simply supported beam. However, weld overruns will introduce moments to the supports. The moments will be resisted by the anchor bolts in tension.
This requires that concrete wall has adequate shear capacity so that it provides a proper imbedment to the bolts.
Bechtel's uppe,r boond calculation (CE Calculation #44-22 " Weld Overrun Evaluation" November 25,1984) demo,pstrated that tension capacity of the
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anchor bolts and shear capacity of the concrete are sufficient to resist
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the moment introduced by the return weld overrun. Bechtel inv_estigated beam supports in the Reactor Building.,All Category I buildings other than Reactor Building are made of composite beams where a reinforced concrete slab is supported by steel beams. The concrete slab is built into the concrete wall thus making the weld overrun -insignificant as a moment contributing element. Bechtel's approach for demonstrating adequacy of the return weld overrun was found to be acceptable.
Following is a list of items covered during the visits.
a.
NCRs concerning. joint weld deficiencies.:
ISN 20851 CW
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ISN 20569 CW ISN 20568 CW ISN 20509 CW b.
Drawingr-P.eactor Building Control Building Master Drawings for Imbedded Plates c.
Calculation Sheets.and Other Document:
CE Calculation #44-22 " Weld Overrun Evaluation" Nov. 25, 1984 CE Calculation #44-24 " Containment Cooler" CE Calculation #44-25 " Pressurizer Support" C.
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REFERENCES 1.
Memorandum from D.,G. Eisenhut.of NRR from R, k Denise of Region IV
" Request for a Technical Assistance Wolf Creek Generating Station DN-50-482" dated November 2, 1984.
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2.
Memorandum to File from S. B. Kim of Structural and Geotechnical Engineering Branch, NRR, " Response to the Technical Assistance Request on Wolf Creek Weld Joints Inspection Program, dated November 19, 1984.
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