ML19345G196
| ML19345G196 | |
| Person / Time | |
|---|---|
| Site: | Perkins, Cherokee  |
| Issue date: | 03/04/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Dail L DUKE POWER CO. |
| References | |
| NUDOCS 8103170033 | |
| Download: ML19345G196 (1) | |
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r%fA-UNITED STATES
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NUCLEAR REGULATORY COMMISSION c
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e ATLANTA, GEORGIA 30303 MAR 11981 In Reply Refer To:
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Duke Power Company
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L. C. Dail, Vice President 4
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k P. O. Box 33189 Charlotte, NC 28242 Gentlemen:
IE Bulletin 81-01 has been revised to change the identification of the power reactor facilities with construction permits to which the bulletin is applicable.
Th s change does not affect your requirements with respect to the bulletin. As a result, the enclosed revised pages 5 and 6 are forwarded to you for information.
Should you have any questions regarding this bulletin revision, please contact this of f'ce.
Sincerely,
<Y"M2 James P. O'Reilly Director
Enclosures:
1.
IE Bulletin No. 81-01 with revised pages 5 and 6 2.
List of Recently Issued IE Bulletins cc w/ei.cl:
J. T. Moore, Project Manager 001 706 0
SSINS No.:
6820 Accession No.:
8005050075 IEB 81-01 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 January 27, 1981 IE Bulletin No. 81-01:
SURVEILLANCE OF M2CHANICAL SNUBBERS Description of Circumstances:
Several instances of failutet of mechanical snubbers supplied by International Nuclear Safg uards Corporation (INC) have been identffied that indicate possible deficiencies in these snubbers. A summary of the failures that have occurred
- s 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 Browne Ferry Nuclear Power Unit No 3.
All of these units were found to be frctan, and the cause was attributed to a failt.re to lubricate th^ 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 inoperat:le because they were found to be fro.u n.
The failures were caused by oxidation on the internals
.and by, improper. assembly. All.!NC. mechanical s wbbers were replaced with units produced by another manufacturer, l
3.
('n April 8, 1977, Iowa Electric Light and Power Company submitted event report No. 77-23 for the Chane Arnold Energy Center facility that identi-fled 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 ancther manufacturer.
4.
On December 5,1979, personnel from the Nuclear Regulatory Commission
.isited 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 me u than 4,000 mechanical pipe restraints (snubbers) supplied by INC.
In 1978, FFTF examined more than ovv a from their installation and 6 pupLICATE DOCUMrNT were frozen.
The plant was T{
seen no service and had bee h Entire document previously environments for 1 to 2 yea et entered into syster under:
8005050075 l
nNo Recently issued I$ bull'etins l
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