ML19345G208
| ML19345G208 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/02/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8103170072 | |
| Download: ML19345G208 (2) | |
Text
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Docket No. 50-l.83 Docket No. 50-486 Union Electric Company ATTN:
Mr. John K. Bryan Vice President - Nuclear Post Office Box 149 St. Loui:,, MO 63:66 cc w/ encl:
W. H. Weber, Manager Nur'2ar Construct:.un (i li r e
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GLEN ELLYN. ILLINOIS 6o137
%g.....,o March 2, 1981 Gentlemen-The enclosed !E Circular No. 81-03 is fors arded for your information.
No 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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f#JamesG.Keppler Director Enclosure.
IE Circular No. 81-03 l
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SSlNS No.:
6820 Accession No.:
8005050075 IEB 81-01 UNITED STATES NUC'C.AR 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 instances of 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 Authori+y 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 sub equently identified 5 of 14 inoperable units on Browns Ferry Nuclear Pow;
' qit 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 Corpcration 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. A.ll.INC. mechanical snubbers were_ replaced with l
' units produced by ano'ther manufacturer.
l 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-l fied 13 INC Model IMSVA-1 Type AS snubbers to be frozen; the cause of i
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 visited Dtaartment 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 i DUPLICATE DOCUMENT were frozen.
Tha plant was f?j l
seen no service and had bee Entire document previously environments for 1 to 2 yea 2 entered into system under:
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j ANO sueb bulietins No. of pages:
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