ML19351F797
| ML19351F797 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/27/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 8102200186 | |
| Download: ML19351F797 (1) | |
Text
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UNITED STATES 3 ~~ '
NUCLEAR REGULATORY COMMISSION I
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j REGION IV o
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'8 611 RYAN PLAZA DRIVE, SUITE 1000 ARUNGToN, TEXAS 76011 January 27, 1981 In Reply Refer To:
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RIV g
3-s Docket Nos.
50-445/IE Bulletin No. 81-01 b -[J -
4 50-446/IE Bulletin No. 81-01
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E FE B 0',319.81
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Texas Utilities Generating Company
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ATTN: Mr. R. J. Gary, Executive Vice g
d President and General Manager a,
2001 Bryan Tower Dallas, Texas 75201 Gentlemen:
The enclosed IE Bulletin 81-01 is forwarded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
/
4 Karl V. Seyfri,t/r Director
/
,/
Enclosures:
1.
List of Recently issued IE Bulletins l
1 I
I I
l l
'810220 0%6 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:
l Several instances of failures of mechanical snubbers supplied by International Nuclear Safeguards Corporation (INC) have been identified that indicate possible i
deficiencies in these snubbers.
A summary of the failures that have occurred t
l 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 o 'hese 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 Lfght Company submitted event report No. 50-335-76-9 wherein five INC MWel MSVA-1 snubbers.cre idsi:tified 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 Duane Arnold Energy Center facility that identi-fiet' 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 (DOE) 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:
ODSD C00 TV ANO No. of Pages:
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