ML19345G190
| ML19345G190 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 03/02/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Draper E GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 8103170015 | |
| Download: ML19345G190 (1) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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61% RY AN PLAZA DRIVE. SulTE 1000 3.....
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'8 ARLINGTON. TEX AS 76011 March 2, 1981 Docket Nos.
50-458 50-459 t
Gulf States Utilities ATTN: Dr. E. Linn Draper, Jr.
Vice President - Technology Post Office Box 2951 Beaumont, Texas 77704 Gentlemen:
The enclosed IE Circular is forwarded for your infonr.ation. No written response to this circular is required.
If you hava any questions
- ed to this matter, please contact this office.
Sincerely, y/
/Karl V. Seyfrit Director
Enclosures:
1.
IE Circular No. 31-03 2.
List of Pacently Issued-IE-Circulars
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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 MECHANICAL SNUBBERS peseristion of Circumstances:
Several instances of failures of mechanical snubbers supplied by International Nuclear Safeguards Corporation (INC) have b en identified that indicate possiole 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 ?4 inoperable units on Browns Ferry Nuclear Power Unit No 3.
All of these units were founc 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 because they were found to be frozen. The failures were caused by oxidation on the internals and by-, improper.assem.bly.
All.INC. mechanical snubbers were replaced with units produced by another manufacturer.
3.
On April 8,1977, Iowa Elactric 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 DUPLICATE DOCUMENT were frozen.
The plant was seen no service and had bee Entire document previously environments for 1 to 2 yea entered into system under:
8005050075*
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Recently issued IE bulletins
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