ML19350B655
| ML19350B655 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 03/04/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Pollock M LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 8103230196 | |
| Download: ML19350B655 (1) | |
Text
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UNITED STATES 8 ],)
NUCLEAR REGULATORY COMMISSION
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4198 b "34 @Vth Docket No. 50-322 MAR Q /,fg.l 3,rgOl A Long Island Lighting Company 6
ATTN: Mr. M. S. Pollock
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Vice President - Nuclear
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175 East 01d Country Road 9
r Hicksville, New York 11801
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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 wnich 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, Ce (eH.Grier Director
Enclosures:
Revised pages 5 and 6 of IE Bulletin 81-01 and List of Recently Issued IE Bulletins i
CONTACT:
D. L. Caphton
.(215-337-5266) cc w/encis:
J. P. Novarro, Project Manager Edward M. Barrett,. Esquire Edward J. Walsh, Esquire T. F. Gerecke, Manager, Engineering QA Department
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SSINS No.: 5520 Accession No.-
3005050075 IES S1-01
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NUCLEAR REGULATORY CCNiISSION 3,j OFFICE OF INSPECTION AND ENFCRCEMENT WASHINGTCN, D.C.
20555 January 27, 1931 c..
-IE Bulletin No. 81-01:
SURVEILLANCE OF MECHANICAL SNUBBERS Description of Circumstances:
Several instances of failures of =echanical snubbers supp' lied by International Nuclear Safeguards Corporation (INC) have been identified that indicate possible deficiencies in these snubbers. A su==ary of the failures that have cccurred is provided below:
1.
On August 9,1974, the Tennessee Valley Authority submitted event repcrt BFAO-50-260/741W identifying 11 of 14 INC Model MSVA-1A snubbers that were found inoperable en 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 fro:en, and the cause was attributed to a failure to lubricate the parts during asse:51y.
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 Fewer and Light Corporation submitted event report No 50-335-76-9 wherein five
- NC Model MSVA-1 snubbers were identified as inoperable because they were found to be fro
- en. The failures were caused by exidatien en the internals and by improper assembly. All INC =echanical snubbers were replaced with units produced by another manufacturer.
On April 8, 1977, Icwa: Electric Lignt and Pcwer Company submitted event 3.
report No. 77-23 for the.Duane Arnold Energy Center facility that identi-fied 13 INC Medel IMSVA-1 Type AS snubbers to be frozen; the cause of failure was attributed to large a=ounts of interior oxidation. The units were replaced with those produced by'another manufacturer.
4 On December 5,1979, personnel frca the Nuclear Regulatory Cc= ission visited Department of Energy (DOE) facilities at Richland, Washingten, to obtain information on DOE experience with INC snubbers at the Fast Flux Test Facility (FFTF). The DOE-owned FFTF was equipped with more than 4,000 cechanical pipe restraints (snubbers) supplied by INC.
In 1973, FFTF exa=ined more than 800 of these =echanical snubbers by removing the=
from their installation-and found that 43, or about 5% of those exa=ined,
.were. frozen. The plant was still under construction so the snubbers had seen no service and had been subjected to only normal construction environ =ents for 1 to 2 years.
Attachment:
Recently issued IE bulletins A