ML19345G048
| ML19345G048 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point, Palisades File:Consumers Energy icon.png |
| Issue date: | 01/27/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8102190834 | |
| Download: ML19345G048 (1) | |
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GLEN ELLYN, ILLINOIS 60137 January 27, 1981 Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarded for your action with regard to your nuclear power facility.
To assist the NRC in evaluating the value/ impact of each bulletin on all licensees, it would be helpful if you would provide an estimate of the manpower expended in the review and preparation of the report (s) required by the bulletin.
Please estimate separately the manpower associated with corrective aLcions required by this bulletin.
Should you have any questions regarding this bulletin or the actions required of you, please contact this office.
Sincerely,
}lb James G. Keppler Director
Enclosure:
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Docket No. 50-155 Docket No. 50-255 Consumers Power Company ATTN:
Mr. R. B. DeWitt Vice President Nuclear Operations 212 West Michigan Avenue Jackson, MI 49201 cc w/ encl:
D. P. Hoffman, Nuclear Licensing Administrator C. J. Hartman, Plant Superintendent R. W. Montross, Manager Central Files AD/ Licensing AD/ Operating Reactors AE0D Resident Inspectors, RIII PDR Local PDR Ronald Callen, Michigan Public Service Commission Myron M. Cherry O'
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SSINS No.:
6820 Accession No.-
8005050075 1
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE CF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 81-01 January 27, 1981 Page 1 of 7 SURVEILLANCE OF MECHANICAL SNUBBERS Descriotion 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 assemoly.
i 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 j
and Light Company submitted event report No. 50-335-76-9 wherein five INC Hodel 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.
l 3.
On April 8, 1977, Iowa Electric Light and Power Company submitted event I
report No. 77-23 for the Ouane Arnold Energy Center facility that identi-fied 13 INC Model 1MSVA-1 Type AS snubbers to be frozen; the cause of i
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:
bDYO$bo 7T ANO No. of pages:
.