ML19351G055
| ML19351G055 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, LaSalle  |
| Issue date: | 01/27/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8102230035 | |
| Download: ML19351G055 (1) | |
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'o UNITED STATES E"
NUCLEAP REGULATORY COMMISSION
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REGION lli 8
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E GLEN ELLYN, ILLINOIS 60137
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o January 27, 1981 1
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Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarded to you for information.
No written respons? is required.
If you desire additional information re-garding this matter, please contact this office.
Sincerely 1
(u, A f..= < ^ u pJamesG.Keppler Director i
Enclosure:
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Docket Nos. 50-373, 50-374; 50-454, 50-455; 50-456 and 50-457
' Commonwealth Edison Company ATTN:
Mr. Cordell Reed, Vice President Post Office Box 767 Chicago, IL 60690 cc w/ enc 1:
J. S. Able, Director CD If',
of Nuclear Licensing L. J. Burke, Site I
Construction Superintendent 2V 9,[ 8 4//gO [('-)-
d T. E. Quaka, Quality Assurance Supervisor
/gg7 44, Q R. H. Holyoak, Station
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Superintendent Akt B. B. Stephenson, Project
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Manager 4
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V. I. Schlosser, Project Manager R. E. Querio, Station Superintendent Gunner Sorensen, Site Project Superintendent R. Cosaro, Project Superintendent J. F. Gudac, Station Superintendent Central Files AD/ Licensing AD/ Operating Reactars AEOD Resident Inspector, RIII PDR Local PDR (j7 Dean Hansell, Office of i -
Assistant Attorney General Myron M. Cherry n_
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SSINS No.:
6820 Accession No.-
8005050075 l
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 SURVEILLANCE OF MECHANICAL SNUBBERS 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 snuboers.
A summary of the failures that have occurred is provided below:
1.
On August 9, 1974, the Tennessee Valley Authority submitted event report BFA0-50-260/741W 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.
All of these units were found to be frozen, and the cause was attributed to a failure to lubricate the parts during assembly.
l The failed snubbers were replaced witn new units produced by the same l
manufacturer.
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 caused by oxidation on the internals and by improper assembly.
All INC mechanical snubbers were replaced with units produced by another ma.iufacturer.
3.
On April 8,1977, Iowa Electric Light and Power Company submitted event report No. 77-23 for the Duane Arnold Energy Center facility that identi-fied 13 INC Model IMSVA-1 Type AS snubbers to be frozen; the cause of failure was attributed to large aounts 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 (DOE) facilities at Richland, Washington, to obtain information on DOE experience Test Facility (FFTF). The DOE-owned 4,000 mechanical pipe restra kts (sn DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously entered into system under:'
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