ML19350B215
| ML19350B215 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/04/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| NUDOCS 8103200102 | |
| Download: ML19350B215 (1) | |
Text
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'o UNITED STATES
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I ATTN: Mr. C. N. Dunn 7
Vice President h
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Operations Division
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p 435 Sixth Avenue y\\
Pittsburgh, Pennsylvania 15219 Gentlemen:
IE Bulletin No. 31-01, "Survaillance of Mechanical Snubbers," transmitted to you on January 27, 1931, has been revised to change the identification of the power reactor facilities with construction permits to which the Bulletin is applicable.
This change does not affect your require ents 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, CB i,
coy e H. Grier Director
Enclosures:
Revised pages 5 and 6 of IE Sulletin 81-01 and List of Recently Issued IE Bulletins CCNTACT:
D. L. Caphton (215-337-5266) cc w/encls:
F. Bissert, Technical Assistant Nuclear R. Washabaugh, QA Manager J. Werling, Station Superintendent G Moore, General Superintendent, Power Stations Department J. J. Carey, Director of Nuclear Operations R. Martin, Nuclear Engineer J. Sieber, Superintendent of Licensing and Compliance, BVPS Q
8103300102
SSINS Nr :
6520 Accession NO.:
5005050075 IEE B1-01 UNITED STATES NUCLEAR REGU' ATCRY CCV.VISSICN CFFICE OF INSPECTION AND ENFORCEMENT WASHING'ON, D.C.
20555 January 27, 1951 IE Balletin No. 81-01:
SURVEILLANCE OF MECHANICAL SNUEEERS Descriction of Circumstances:
Several instances of failures of mechanical snubbers supplied by Internatienal Nuclear Safeguards Corporation (INC) have been identified that indicate possible deficiencies in these snubbers. A su-ary of the failures that have occurred is provided below:
1.
On August 9, 1974, the Tennessee Valley Authority submitted event report EFAO-50-260/741W identifying 11 of 14 INC Medel MSVA-1A snubbers that were found inoperable on Br wns Ferry Nuclear Pcoer.itation Unit 2 and subsequently identified 5 of 14 inoperable units on Erc ns Ferry Nuclear Pcoer Unit No 3 All of these units were found te be frc:en, and the cause was attributed to a 'ailure to lubricate the parcs during assembly.
The failed snubbers were replaced with new units produced by the sa:e manufacturer.
2.
On April 12, 1976, the St. Lu.ie Plant Unit 1 facility of Florida Power and Light Ccrporet;cn sub=1ttid event report No. 50-335-76-9 wherein five INC MO::el MSVA-1 snubbers were; identified as inoperable because they were found to be frc:en. The failuras were caused by oxidation on the internals and by improper assembly. All.INC mechanical snubbers were replaced with
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units produced by ancther manufe.cturer.
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 IMSVA-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 canufacturer.
4.
O'n December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on DOE experience with INC snubbe'rs at the Fast Flux Test Facility (FFTF). The DOE-owned FFTF was equipped with more than 4,000 mechanical pipe restraints (snubbers) sucolied by INC.
In 1978 FFTF exactned more than 800 frc their installation and DUPLICATE DOCUMENT were frozen. The plant was seen no service and had bee Entire doeurent previously environments for 1 to 2 yea enteced into syste:n under:
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Attachment:
Recently is'ued IE bulietins No. of pages:
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