ML19343B886
| ML19343B886 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 01/27/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 8102180140 | |
| Download: ML19343B886 (1) | |
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9'o, UNITED STATES E
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NUCLEAR REGULATORY COMMISSION j
REGION I 0,
631 PARK AVENUE
%,*****,o#g KING oF PRUSSIA. PENNSYLVANIA 19406 JAN 2 71ggy Docket No. 50-244 Rochester Gas and Electric Corporation ATTN:
Mr. John E. Maier
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Vice President Electric and Steam Production 89 East Avenue
_U Rochester, New York 14649 U
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Gentlemen:
The enclosed IE BJlletin No. 81-01, " Surveillance of Mechanical Snubbers," is forwarded to you for action. A written response is required.
In order to assist the NRC in evaluating the value/ impact of each Bulletin on licensees, it would be helpful if you would provide an estimate of the manpower expended in conduct of the review and preparation of the report (s) required by the Bulletia,.
Please estimate separately the manpower associated with corrective actions following identification of problems through the Bulletin.
If you desire additional information regarding this matter, please contact this office.
Sincerely, Boy e H. Grier Director Enclosures.
1.
List of Recently Issued IE Bulletins CONTACT:
D. L. Caphton (215-337-5266) cc w/encls:
B. A. Snow, Plant Superintendent J. Bodine, QC Engineer Harry H. Voigt, Esquire J. T. St. Martin, Technical Assistant, Operations Engineer 810 2180 Mb l
i SSINS No.:
6820 Access'on No.:
800505uG75 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 BFAO-50-260/741W identifying 11 of 14 INC Model MSVA-1A snubbers that l
were found inoperable on Browns Ferry Nuclear Power Station Unit 2 and subsequently identified 5 of 14 inoperable units on Browns Ferry Nuclear
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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.
2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power and Light Company submitted event report No. 50-?35-76-9 wherein five INC Model MSVA-1 snubbers were identified as inoperable because they were l
found to be frozen.
The failures were caused by oxidation on the internals and by irr? roper assembly.
All INC mechanical snubbers were replaced with units procaced by another manufacturer.
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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 manufacturer.
4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (00E) facilities at Richland, Washington, to obtain information on 00E experience Test Facility (FFTF).
The DOE-owned 4,000 mechanical pipe restraints (sn DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously entered into system under:
BOYO $b 7T ANO q
No. of pages:
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