ML19351G040
| ML19351G040 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/27/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8102230010 | |
| Download: ML19351G040 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION E
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o GLEN E LLYN, ILLINOIS 6014, January 27, 1981 Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarded to you for information.
No written response is required.
If you desire additional information re-garding this matter, please contact this office.
Sincerely G _ -> h f.= y= - e u James G. h.eppler Director
Enclosure:
IE Bulletin No. 81-01 8' tora-3colO y
Locket No. 50-483 Sonket No. 50-486 Union Electric Company ATTN:
Mr. John K. Bryan Vice President - Nuclear P. O. Box 149 St. Louis, MO 63166 cc w/ encl:
W. H. Weber, Manager, Nuclear Construction Central Files AD/ Licensing AD/ Operating Reactors PDR Local PDR Region I & IV K. Drey Ronald Fluegge, Utility Division, Missouri Public Service Commission tv 0)
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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 instance:: 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 frozen, and the cause was attributed to a failure to lubricate the parts during assembly.
l 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 Company submitted event renort No. 50-335-76-9 wherein five INC Model MSVA-1 snubbers were identified as inoperable because they were fcond 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 Clectric 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 inte*1or oxidation.
The units were replaced with thosc 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 Tm t Facility (FFTF).
The DOE-owned 4.)00 mechanical pipe restraints (sn DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously i
entered into system under:
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