ML20154D878
| ML20154D878 | |
| Person / Time | |
|---|---|
| Issue date: | 05/06/1988 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Lancelot H RICHMOND SCREW ANCHOR |
| References | |
| NUDOCS 8805200015 | |
| Download: ML20154D878 (3) | |
Text
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Mr. Harry Lancelot. Director of Engineering Richmond Screw Anchor Co., Inc.
7214 Berns Street Fort Worth, Texas 76118 Gentlemen:
The Nuclear Regulatory Conrnission (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 recom-rrended anchor capacity. The Hilti test results indicate that Hilti Kwik-Bolts placed at a distance of five anchor bolt diarneters from an unsupported edge, as recomrended by the Expansion Anchor Manufacturers Institute (EAMI) guidelines, have only 30% of the recommended anchor shear capacity and 78% of the recom-rcended tensile capacity. Hilti further indicated, at a meeting with the NRC staff, that the test results are believed to be applicable to other expansion crGor bolts that use the same type of anchor mechanism as Hilti Kwik-Bolts.
The NRC staf f 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 require further NRC review.
In view of the foregoing, the NRC would
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like to invite representatives of companies that supply bolts or provide bolt 1
installation services to the nuclear industry, such as your company, to attend c rreeting where pertinent information could be freely exchanged between reeting participants. The meeting is scheduled for May 23, 1988, at 1:00 p.m. in Conference Roon IP-B-11 at the NRC's White Flint Building which is located at 11555 Rockville Pike in Rockville, MD. We are requesting that attendees i
present a brief presentation, approximately 15 minutes, that addresses the subjects listed in the reeting agenda and any other aspects related to this issue which you consider irrportant, l
If you plan to attend, or if you have any questions or concerns (such as how to l
present proprietary information), please contact Jaime Guillen at (301) 492-1153 or Rom Lipinski at (301) 492-0844 before May 16, 1988.
Your cecreration on this matter would be greatly appreciated.
Sincerely, Original Syned By Carl R E"r'r 8805200015 000506 Carl H. Perlinger, Chief PDR ORG NRRDPDR Ceneric Correunications Branch Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosures:
1.
Meeting Agenda
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Subjects of Presentations DISTRIPUTION w/ enclosures h#
CERossi, NM CHPerlinger, NRR JGuillen. NRR l;I EJButcher, NRR WDLanning, NRR Plipinski, NRR l
DOEA R/F OGCB R/F JGuillen R/F OGCD(Q0(EA:NPR A W ~d M [v l#GR: DEST:NRR C/0GCP:DOEA:NRR JGuillen flipinski CPPerlinger CE/L /88 05/ ( /88 05/04/88
MM 61988 i
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I May 23. 1988 Meetino Agenda 1
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1 Item Speaker Time l
I Introduction NRC 1:00 - 1:15 p.m.
!!. Presentations by Manufacturers 1:15 - 3:00 p.m.
Manufacturers
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!!!. Discussion / Forum Attendees 3:00 - 4:00 p.m.
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- Invited Manufacturers 1
Hilti, Inc.
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Molly Bolt Co.
Ramset/ITW/ Red Head j
Richmond Screw Anchor Co., Inc.
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Tech. Services - Nuclear, Ramset Division - OLIN
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TRW Assemblies and Fasteners Group, Nelson Stud Division 1
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MAY 6 1988 o
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principal Subjects of Presentations I
1.
Describe your anchor products, their use, and the design recommendations provided to your customers.
II. Does the "five diameters" or other edge distance criterion apply to your anchor products? Provide justification for your answer.
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!!I. Describe any tests conducted by your organization that provides additional information regarding shear capacity reduction as a function of edge distance.
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IV. Provide a list of known nuclear power facilities that use your anchor products.
V.
Describe your company's fatest 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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