ML19351G060
| ML19351G060 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/27/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 8102230045 | |
| Download: ML19351G060 (1) | |
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'o UNITED STATES
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g NUCLEAR REGULATORY COMMISSION g
a REGION lit o,
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7M ROOSEVELT ROAD 7
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GLEN ELLYN, ILLINOIS 60137 January 27, 1981 9
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k Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarded to you 'or information.
I No written response is required.
If you desire additional information re-i i
garding this matter, please contact this office.
Sincerely C:::"
James G. Keppler Director j
Enclosure:
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L Docket No. 50-341 The Detroit Edison Company
' ATTN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 cc w/ encl:
Central Files AD/ Licensing AD/ Operating Reactors AEOD Resident Inspector, RIII PDR Local PDR Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr., Attorney O
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SSINS No.:
68?0 Accession No.:
80050500/5 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 81-01 January 27, 1981 Page 1 of 7 l
SURVEILLANCE OF MECHANICAL SNUBBERS l
Description of Circumstances:
Several instances of failures of mechanical snubbers supplied by International Nuclear Safeguards Corporation (INC) have been identified that indicate possible deficiencies in these snubbers.
A summary of the failures that have occurred is provided below:
1.
On August 9, 1974, the Tennessee Valley Authority submitted event report BFAO-50-260/741W identifying 11 of 14 INC Model MSVA-1A snubbers that were found inoperable on Browns Ferry Nuclear Power Station Unit 2 and subsequently identified 5 of 14 inoperable units on Browns Ferry Nuclear Power Unit No 3.
Al'l of these units were found to be frozen, and the cause was attributed to a failure to lubricate the parts during assembly.
iim failed snubbers were replaced with new units produced by the same manufacturer.
l 2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power and Light Company submitted event report No. 50-335-76-9 wherein five INC Model MSVA-1 snubbers were identified as inoperable because they were found to be frozen. The failures were tsused by oxidation on the internals a.a by improper assembly.
All INC mechanical snubbers were replaced with units produced by another manufacturer.
3.
On April 8, 1977, Iowa Electric Light and Pcwer Company submitted event report No. 77-23 for the Duane Arnold Energy Center facility that identi-fied 13 INC Model 1MSVA-1 Type AS snubbers to be frozen; the cause of failure was attributed to large amounts of interior oxidation.
The units were replaced with those produced by another manufacturer.
4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (00E) facilities at Richland, Washington, to
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obtain information on 00E experience Test Facility (FFTF).
The DOE-owned 4,000 mechanical pipe restraints (s9-DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously entered into system under:"
2 otord 75 ANO No. of pages:
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