ML20154E032
| ML20154E032 | |
| Person / Time | |
|---|---|
| Issue date: | 05/06/1988 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Nuta D EBASCO SERVICES, INC. |
| References | |
| NUDOCS 8805200066 | |
| Download: ML20154E032 (3) | |
Text
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MAY 6 1988
'Mr. Drogus A. Nuta Ebasco Services, Inc.
Two World Trade Center 1ew Yoi4, New York 10048 Gentlemen:
The Nuclear Regulatory Comission (NRC) was infonned by Hilti, Inc., in accor-dance with 10 CFR Part 21, of recent tests of Hilti Kwik-Bolts that indicate that the previously recommended minimum edge distance from an anchor bolt to an unsupported concrete edge may be insufficient to develop 100% of the recan-mended anchor capacity. The Hilti test results indicate that Hilti Kwik-Bolts placed at a distance of five anchor bolt diameters from an unsupported edge, as i
recomended by the Expansion Anchor Manufacturers Institute (EAMI) guidelines, have only 30% of the recommended anchor shear capacity and 78% of the recom-tended tensile capacity. Hilti further indicated, at a meeting with the NRC staff, that the test results are believed to be applicable to other expansion anchor bolts that use the same type of anchor mechanism as Hilti Kwik-Bolts.
The NRC staff feels that the test results indicating a 70% reduction in shear capacity are significant and indicate that there is a potential safety concern that will *equire further NRC review.
In view of the foregcing, the NRC would i
like to invite representatives of companies that supply bolts or provide bolt l
installation services to the nuclear industry, such as your company, to attend a treeting where pertinent information could be freely exchanged between neeting participants. The treeting is scheduled for May 24,1988, at 1:00 p.m. in Conference Room 12-B-11 at the NRC's White Flint Building which is located at 11555 Rockville Pike in Rockville, MD. We are reouesting that attendees l
present a brief presentation, approximately 15 minutes, that addresses the subjects listed in the meeting agenda and any other aspects related to this issue which you consider important.
If you plan to attend, or if you have any questions or concerns (such as how to present proprietary inforration), please contact Jaime Guillen at (301) 492-1153 or Rom Lipinski at (301) 492-0844 before May 16, 1988.
Your j
cooperation on this matter would be greatly appreciated.
)
Sincerely, j
Original Si nd By i
Carl U twept 8805200066 000506 M H. Bednger, W PDR ORG NRRD Generic Comunications Branch PDR Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosures:
1.
Meeting Agenda 2.
Subjects of Presentations DISTRIBUTION w/ enclosures CERossi, hRR CHBerlinger, NRR JGuillen NRR EJButcher, NRR WDLanning, NRR RLipinski, NRR FOR Central Files DCS
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gay 6 1988 May 24. 1988 Peeting Agenda Item Speaker Time 1.
Introduction NRC 1:00 - 1:15 p.m.
II. Presentations by A/Es I:15 - 3:45 p.m.
Architects / Engineers
- III. Discussion / Forum Attendees 3:00 - 4:45 p.m.
- Invited Architects / Engineers
- Bechtel Power Corporation Brown & Root, Inc.
H. J. Degenkolb Ebasco Services. Inc.
Gibbs & Hill, Ir.c.
Gilbert / Commonwealth,Inc.
Sargent & Lundy Engineers Stone & Webster Engineering Corp.
Tennessee Valley Authority URS/ John Blume Associates t
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i MAY 61988 i
Principal Subjects of Preseritations l
What was the "edge distance" as defined in the job specification in nuclear power facilities that you have designed and/or constructed?
Identify the type of anchors to which the "five diameter" or other edge distance criteria applies (expansion anchors, cast-in-place anchors, or all).
l 111. Discuss briefly the type of anchorage used for different types of safety-related equipment in nuclear power plants.
l IV. Describe the anchorage design methods used for nuclear power facilities.
Y.
Describe any anchor tests conducted by your organization and indicate whether any reinforcement', either parallel or normal to the free edge, was present in the test samples.
VI. Based on your experience, estimate the percentage of anchors installed in nuclear power facilities designed and/or constructed by your company that could be a'fected by the "edge distance" issue.
l VII. Present your perspective of the "edge distance" issue.
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