ML19345G205
| ML19345G205 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 03/02/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8103170057 | |
| Download: ML19345G205 (1) | |
Text
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CENTRAL FILES jf *"
'%,,'l NUCLEAR REGULATORY COMMISSION UNITED STATES PDR:HQ LPDR
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611 RvAN PLAZA DRIVE. SUITE 1000 ARLINGTON. TEXAS 76011 ggggg March 2,1981 Docket No.
50-298
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O Nebraska Public Power District p
ATTN:
J. M. Pilant, Director Licensing & Quality Assurance 2
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8. k",,+2 /SgI Post Office Box 499
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Columbus, Nebraska 68601 9
Gentlemen:
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The enclosed IE Circular is forwarded for your informa written response to this circular is required.
If you have any questions related to this matter, please contact this office.
Sincerely,
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ls j. {d'2v.w
/ Karl V. Seyfrit Director
Enclosures:
1.
IE. Circular No. 81-03 2.
List of Recently Issued IE Circulars cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Box 98 i
Brownville, Nebraska 68321 l
l 81031700 %Q u
i SSlNS No.:
6820 Accession No.-
8005050075 l
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 Description of Circumstances:
Several instatices cf 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 inope.able en 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 durina assembly.
The failed snubbers were replaced with new units produced by the same manufacturer.
2.
On April 12, 1976, the St. Lucie Plant Unis 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 ifnprcper.as.sembly. All.INC. mechanical snubbers were rephced with units produced by anciher manufacturer.
3.
On April 8,1977, Iowa Electric Light a.
.ower Company submitted event report No. 77-23 for the Duane Arnold Er c. s 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 obtain information on DOE experience with INC snubbers at the Fast Flux Test Facility (F5TF). The DOE-owned FFTF was equipped with more than 4,000 mechanical pipe restraints (snubbers) supplied by INC.
In 1978, FF7F examined more than suu from their intallation and N{
DUPLICATE DOCUMENT were frozen.
The plant was d; seennoserviceandhadbeetj Entire document previously i
environments for 1 to 2 yea h"'
nNo 8005G50075~
entered into system under:
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Attachment:
Recently issued IE bulletins
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