ML20003B584
| ML20003B584 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/27/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8102120499 | |
| Download: ML20003B584 (1) | |
Text
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a Rtauq'o UNITED STATES
' [",~g NUCLEAR REGULATORY COMMISSION g
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101 MARIETTA ST N.W.. SUITE 3100 g
ATLANTA, G EORGIA 30303 JAN 2 71981 In Reply Refer To:
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Virginia Electric and Power Company ATTN:
J. H. Ferguson 0,, $%*',I%
Executive Vice President-Power 7 ~'
8/'hl P. O. Box 26666 4
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Richmond, VA 23261 q,
Gentlemen:
4 The enclose <' IE Bulletin No. 81-01 is forwarded to you for information. No written response is required. If you desire additional information regarding this matter, please contact this office.
Sincerely, 4
James P. O'Reilly Director
Enclosures:
1.
List of Recently Issued IE Bulletins cc w/ encl:
W. R. Cartwright, Station Manager P. G. Perry, Senior Resident Engineer i
810 2120W.-
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SSINS No.:
6820 Accession No..
8005050075 IEB 81-01 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Janua ry 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 Station Unit 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 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 assembly.
All INC mechanical snubbers were replaced with units produced by another manufacturer.
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 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 manufacturcr.
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 (ttTF). The DOE-owned FFTF was equipped with more than l
bbers) supplied by INC.
In 1978, mechanical snubbers by removing them t 43, or about 5% of those examined, DUPLICATE DOCUMENT Entire document previously d to only normal construc:lon entered into system under:
OM6N ANO No. of ages:
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