ML19350A846
| ML19350A846 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/04/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8103160981 | |
| Download: ML19350A846 (1) | |
Text
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Docket No. 50-483 G ocket No. 50-486 Union Electric Company ATTN:
Mr. John K. Bry w.
Vice President - Nuclear Post Office Box 149 St. Louis, MO 63166 cc w/ encl:
W. H. Weber, Manager Nuclear Construction Central Files AD/ Licensing AD/ Operating Reactors PDR Loc-1 PDR
.C Regions I & TV K. Drey h9 Ronald TIuegge, Utility p
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UNITED STATES 8
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GLEN ELLYN, ILLINOIS 60137 March 4, 1981 e
Gentlemen:
IE Bulletin No. 81-01 has been revised to change the it'entificatic.. Of t'te power reactor facilities with construction permits to which the bulletin is applicable. This change does not affect your requirements with respect to the bulletin. As a result, the enclosed revised pages 5 and 6 are forwarded to you for information.
Should you have any questions regarding this bulletin revision, please contact this office.
Sincerely, J b
'[f' u t P i w-
,./ James G. Keppler Director
Enclosure:
IE Bulletin No. 81-01, Revision 1
n_
l SSINS No.:
6820 l
Accession No.:
8005050075 UNITED STATES t
l NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHIhGTON, 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 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 wera 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 report No. 50-335-76-9 wherein five INC Model MSVA-1 snubbert 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 l
units produced by another manufacturer.
f 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 l
failure was attributed to large amounts of interior oxidation.
The units were replaced with those produced by another manufacturer.
l 4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (DOE) facilities at Richland, Washington, to
+
l obtain information on DOE experience Test Facility (FFTF). The DOE-owned 4,000 mechanical pipe restraints (sn FFTF examined more than 800 of these DUPLICATE DOCUMENT Entire document previously entered into systera under:'
sootor o 75 ANO No. of Pages: