ML20154E693
| ML20154E693 | |
| Person / Time | |
|---|---|
| Issue date: | 05/06/1988 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Eshbach R GILBERT/COMMONWEALTH, INC. (FORMERLY GILBERT ASSOCIAT |
| References | |
| REF-PT21-88 NUDOCS 8805200293 | |
| Download: ML20154E693 (3) | |
Text
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MAY 6 1988 Mr. Robert M. Eshbach Gilbert / Commonwealth, Inc.
P. O. Box 1498 Reading, Pennsylvania 19603 Gentlemen:
The Nuclear Regulatory Comission (NRC) was informed by Hilti, Inc., in accor-dance with 10 CFR Part 21, of recent tests of Hilti Mwik-Bolts that indicate that the previously recommended minimum edge distante from an anchor bolt to an unsupported concrete edge may be insufficient to develop 1007 of the recom-mended anchor capacity. The Hilti test results indicate that Hilti Kwik-Bolts placed at a distance of five anchor bolt dianeters from an unsupported edge, as recomended by the Expansion Anchor Manufacturers Institute (EAMI) guidelines, have only 30% of the recorrended anchor shear capacity and 78% of the recom-rended 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 require further NRC review.
In view of the foregoing, the NRC would like to invite representatives of companies that supply bolts or provide bolt installation services to the nuclear industry, such as your company, to attend a meeting where pertinent information could be freely exchanged between meeting participants. The meeting is scheduled for May 24, 1988, at 1:00 p.m. in Conference Poom 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, Origin 31 Signed Bf Cyl H. Deriinger Carl H. Berlinger, Chief 8805200293 080506 Generic Communications Branch R
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Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosures:
1.
Meeting Agenda 2.
Subjects of Presentations DISTRIBUTION w/ench.sures CERossi, NRR CHBerlinger, NRR JGuillen, NRR EJButcher, NRR WDLanning, NRR PLipinski, NRR PCR Central Files DCS i/
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May 24, 1988 Meeting Agenda Item Speaker Time 1.
Introduction NRC 1:00 - 1:15 p.m.
II, Presentations by A/Es 1:15 - 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, Inc.
f Gilbert /Comonwealth, Inc.
l Sargent & Lundy Engineers Stone & k'ebster Engineering Corp.
Tennessee Valley Authority URS/ John Blurre Associates i
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Principal Sub.iects of Presentations I.
What was the "edge distance" as defined in the job specification in nuclear power facilities that you have designed and/or constructed?
II.
Identify the type of anchors to which the "five diameter" or other edge distance criteria applies (expansion anchors, cast-in-place anchors, or all).
III. Discuss briefly the type of anchorage used for different types of safety-related equipment in nuclear power plants.
IV. Describe the anchorage design methods used for nuclear power facilities.
V.
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 affected by the "edge distance" issue.
VII. Present your perspective of the "edge distance" issue.
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