ML19341C054
| ML19341C054 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 01/27/1981 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Dobson D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 8102280542 | |
| Download: ML19341C054 (1) | |
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L.H TED STATES EY l' i
.:UCLE AR REr'ULATORY CCMMISSION
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unur cr.tru etazA e,,,e V A L NU T "F E K, C ALIFOR N t A G459G January 27, 1981 g
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Docket Nos. 50-508, 50-509 FEB 0 5193185 -
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.,4 Washington Public Power Supolv System b// jig, g 15A P. O. Box 1223 Elma, Washington 98541 Attention: Mr. Dale Dobson, Acting Program Director Gentlemen:
The enclosed Bulletin 81-01 is forwarded to you for information.
No written response is required.
If you desire additional information regaroing tnis matter, please contact tnis office.
Sincerely,
. l ')..,iti, R. H. Engelken Director
Enclosures:
1.
Recently issued IE Bulletins cc w/ enclosures:
M. E. Uitherspoon, Quality Asst rance Director, WPPSS G. C. Sorensen, WPPSS o, og 28 05.4 2
SSINS No.:
6820 Accession No.
8005050075 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 81-01 January 27, 1981 Page 1 of 7 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 i
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 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 during assembly.
The failed snubbers were replaced with new units produced by the same manufacturer.
j 2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power and Light Company 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 anc 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 manufacturer.
4.
On December 5,1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (DOE) facilities at Richland, Washington,
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obtain information on DOE experience w'
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Test Facility (FFTF).
The DOE-owned 4,000 mechanical pipe restraints (sn DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously enteredintosystemunder[:
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