ML19350B200
| ML19350B200 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/04/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 8103200078 | |
| Download: ML19350B200 (1) | |
Text
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Docket No. 50-213 MAR 4 N61 k
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6j y, fg 2 3 g Connecticut Yankee Atomic Power Company 3
7 ATTN: Mr. W. G. Counsil Q 3 g% %, y Vice President - Nuclear Engineering and Operations g
a P. O. Box 270 Hartford, Connecticut 06101
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Gentlemen:
IE Bulletin No. 81-01, " Surveillance of Mechanical Snubbers," transmitted to you on January 27, 1981, has been revised to change the identification of the power reactor facilities with construction permits to which the Bulletin is applicable.
This change does not affect your requirements with respect to the original Bulletin. As a result, the enclosed revised pages 5 and 6, are forwarded to you for information.
If you desire additional information regarding this matter, please contact this office.
Sincerely, CL i
Efdy e H. Grier Director Enclosureshes5and6ofIEGulletin81-01and Revised pa List of Recently Issued IE Bulletins CONTACT:
D. L. Caphton l
(215-337-5266) cc w/encls:
R. Graves, Plant Superintendent D. G. Diedrick, Manager of Quality Assurance i
J. R. Himmelwright, Licensing Safeguards Engineer k
8103200078
SSINS No.:
6820 Accession No.:
8005050075 IES 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 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 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 subsequently identified 5 of 14 inoperable units on Browns Ferry Nuclear Power Unit No 3.
All of these units were found to be froten, and the cause was attributed to a failure to lubricate the parts cering 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 sub-ftted event report No. 50-335-76-9 wherein five INC Model MSVA-1 snubbers -ere identified as inoperable because they were found to be frozen.
The failures were caused by oxidation on the internals and by 1;nproper assembly. All.INC mechanical snubbers were replaced with units produced by another manufacturer.
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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 Flu's 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 ovu from their installation and O DUPLICATE DOCUMENT were frozen.
The plant was fi seen no service and had bee 3 Entire document previously environments for 1 to 2 yea 7 entered into system under:
8005050075 AND
Attachment:
Recently issued I$ bulietins No. of pages:
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