ML19345G207
| ML19345G207 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/04/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8103170063 | |
| Download: ML19345G207 (1) | |
Text
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jo UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
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,y REGION 11 e[
101 MARIETTA ST., N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 MAR t 1981 In Reply Refer To:
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Mississippi Power and Light Company 09193;.
ATTN:
N. L. Stampley 6
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Vice President of Production
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Jackson, MS 39205 Gentlemen:
IE Bulletin 81-01 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 requirements with respect to the bulletin. As a result, the enclosed revised pages 5 and 6 are forwarded to you for information.
Should you have any questions regarding this bulletin revision, please contact this office.
Sincerely,
^
y James P. O'Reilly Director
Enclosures:
1.
IE Bulletin No. 81-01 with revised pages 5 and 6 2.
List of Recently Issued IE Bulletins cc w/ encl:
C. K. McCoy, Plant Manager
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81031 70 g $
SSINS No.:
6820 Accession No.:
8005050075 IEB 81-01 UNITED STATES NUCLEAR REGULATORf CUMMISSION OFFICE OF IN:dECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 January 27, 1981 IE Bulletin No. 81-01:
SURVEILLANCE OF MECHANICAL SNUBBERS t
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 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 assembly.
The failed snubbers were repla:ed 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 Corporation 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
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units produced by another ma'nufacturer.
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-l 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 manufacturer.
4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on D0 experience with INC snubbers at the Fast Flux Test Facility (FFTF). The DOE-owned FFTF was equipped with more than 4,000 mechanical pipe restraints (snubbers) supplied by INC.
In 1978.
FFTF examined more than vvo from their installation and
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DUPLICATE DOCUMENT were frozen.
The plant was seen no service and had bee d
Entire document previously environments for 1 to 2 yea
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entered into system under:
8005050075
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ANO l.
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