ML19347D322
| ML19347D322 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/04/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8103170092 | |
| Download: ML19347D322 (1) | |
Text
- t:u 9'h UNITED STATES c
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NUCLEAR REGULATORY COMMISSION N
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GLEN ELLYN, ILLINOIS 60137 March 4, 1981
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Docket No. 50-373
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Commonuealth Edison Company Af4#
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Mr. Cordell Reed 6 44%
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Vice President Post Office Box 767 gy Chicago, IL 60690 t
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py Gentlemen:
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IE Bulletin 81-01 has been revised to add your power reactor facility to those with construction permits to which the bulletin is applicable. As a result, the enclosed IE Bulletin No. 81-01, with revised pages 5 and 6, is forwarded for your action with regard to your power reactor facility.
To assist NRC in evaluating the value/ impact each bulletin on all licensees, it would be helpful if you would pc eide an estimate of the manpower expended in the review and preparation of the report required by the bulletin. Please estimate separately the manpower associated with corrective actions required by this bulletin.
Should you have any questions regarding this bulletin, its revision, or the actions required of you, please contact this office.
Sincerely, 4 E--
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W James G. Keppler Director
Enclosure:
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No. 81-01,.
'on 1 cc w/ enc 1:
J. S. Abel, Direc.or AD/ Licensing of Nuclear Licensing AD/ Operating Reactors L. J. Burke, Site AE0D Construction Superintendent Resident Inspector, RIII T. E. Quaka, Quality PDR Assurance Supervisor Local PDR R. H. Holyoak, Station NSJC Superintendent WC B. B. Stephenson, Project Dean Hansell, Office of Manager Assistant Attorney General Central Files Myron M. Cherry 8103170 g g
SSINS No.:
6620 Accession No.:
8005050075 IEB 81-01 UNITED STATES NUCLEAR REGULATORY CCMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 January 27, 1981 IE Bulletin No. 81-01:
SURVEILLANCE OF MECHANICAL SNUBBERS Description of Circumstances:
Several instances of failures of mechanical snubbers supplied by Intern-tional 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 evnt 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 Neclear 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.
The failed snubbers were replaced with new units produced by the same manufacturer.
2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power and Light Corporation submitted event report No. 50-335-76-9 wherein five INC Model MSVA-1 snubbers were identified as inoperable bec.wse they were found to be frozen.
The failures were caused by oxidation on the internals and by, improper as.sembly. A.ll.INC. mechanical snubbers were replaced with units produced by another manufacturer.
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 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 (DOE) facilities at Richland, Washington, to obtain information on DOE experience with INC snubbers at the Fast Flux Test Facility (FFTF).
The DOE-owned FFTF was equipped with more than 4,000 mechanical pipe restraints (snubbers) supplied by INC.
In 1978, FFTF examined more than 800 from their installation and S DUPLICATE DOCUMENT were frozen. The plant was seen no service and had bee i
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