ML19339C970
| ML19339C970 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 01/27/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8102130024 | |
| Download: ML19339C970 (1) | |
Text
CENTriAL FILES
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NUCLEAR REGULATORY COMMISSION LPDR
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REGION IV
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AnuNGToN, TEXAS M011 STATE January 27, 1981 Cocket No.
50-298 Y
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Nebraska Public Power District ATTN:
J. M. Pilant, Director k
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Licensing & Quality Assurance cf y @ @fp
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Post Office Sox 499 4
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y Gentlemen:
The enclosed IE Sulletin No. 31-01 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 heloful if you would provide an estimate of the manpcwer expended in the review and preparation of the report (s) required oy 2e bulletin.
Please estimate separately the manpcwer associated with corrective actions required by this culletin.
Should you have any questions regarding this bulletin or de actions required of you, please contact tnis office.
Sincerely,
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f)L:s"l y/ /{ /4{
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'Karl V. Seyfrit/
Director
Enclosures:
1.
IE Sulletin No. 31-01 2.
List of Recently issued IE Sulletins 00:
L. C. Lessor, Sucerintencent Coccer Nuclear Sta:icn
?cs: Office Sox 98 3rewnvilla, Neoraska 58321 810213 0 6L k
SSINS No.:
6820 Accession No.:
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 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 3, 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 l
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 were replaced with new units produced by the same manufacturer.
l 2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power i
and Light Company submitted event report No. 50-335-76-9 wherein five INC Model 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.
3.
On April 8, 1977, Iowa Electric Light and Power Company submitted event 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 j
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
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visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on DOE experience Test Facility (FFTF).
The DCE-owned 4,000 mechanical pipe restraints (sn DUPLICATE DOCUbH NT FFTF examined more than 800 of these Entire document previously
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entered into system under:'
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No. of pages:
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