ML20154D823
| ML20154D823 | |
| Person / Time | |
|---|---|
| Issue date: | 05/06/1988 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Poparad C HILTI FASTENING SYSTEMS |
| References | |
| REF-PT21-88 NUDOCS 8805190361 | |
| Download: ML20154D823 (3) | |
Text
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MAY 6 1988 3g Mr. Charles Poparad
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i Hilti, Inc.
5400 S. 122 E. Avenue P. O. Box 21148 Tulsa, Oklahoma 74121 Gentlemen:
i The Nuclear Regu'] tory Comission (NRC) was informed 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 recom-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 recomended by the Expansion Anchor Manufacturers Institute (EAMI) guidelines, have cnly 30% of the recommended anchor shear capacity and 78% of the recom-
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mended 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 scme type of anchor mechanism as Hilti Kwik-Bolts.
The NRC staff feels that the test results indicating a 70% reduction in shear capacity are sigr.ificant and indicate that there is a potential safety concern that will require further NRC review.
In view of the foregoing, the NRC would like to invite representatives of companies that supply bolts or provide bolt instcllation services to the nuclear industry, such as your company, to attend a meeting where pertinent information could be freely exchanged between meeting 1
participants. The meeting is scheduled for May 23,1988, 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 requesting that attendees 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 information), please contact Jaime Guillen at (301) 492-1153 or Rom Lipinski at (301) 492-0844 before May 16, 1988.
Your cooperation on this matter would be greatly appreciated.
Sincerely, Original Signed By pg M ?jf ((@ggg,,
Owl H. Berlinger 88 PDR Carl H. Berlinger, Chief Generic Communications Branch Division of Operational Events Assessment
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Office of Nuclear Reactor Regulation
Enclosures:
1.
Peeting Agenda 2.
Subjects of Presentations DISTRIBUTION w/ enclosures h'
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MAY 6 1988 f
May 23, 1988 Meeting Agenda Item Speaker Time I.
Introduction NRC 1:00 - 1:15 p.m.
II. Presentations by Manufacturers 1:15 - 3:00 p.m.
Manufacturers
- III. Discussion / Forum Attendees 3:00 - 4:00 p.m.
d
- Invited Manufacturers Hilti, Inc.
Molly Bolt Co.
Ramset/ITW/ Red Head Richmond Screw Anchor Co., Inc.
Tech. Services - Nuclear, Ramset Division - OLIN i
TRW Assemblies and Fasteners Group, Nelson Stud Division i
i e
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GAY 6 1988 Principal Subjects of Presentations I.
Describe your arehor products, their use, and the design recomendations provided to your customers.
II.
Does the "five diameters" or other edge distance criterion apply to your anchor products? Provide justification for your answer.
III. Describe any tests conducted by your organization that provides additional j
infonnation regarding shear capacity reduction as a function of edge distance.
IV.
Provide a list of known nuclear pow'er facilities that use your anchor products.
V.
Describe your company's l'atest recommendations regarding edge distance control and their bases.
VI. Approximately what percentage of your type of anchors are possibly affect-ed by the "edge distance" issue?
VII. Present your perspective of the "edge distance" issue.
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