ML19341C073
| ML19341C073 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 01/27/1981 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8102280582 | |
| Download: ML19341C073 (1) | |
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.scuary 27, 1981 Occket No. 50-133 r
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s Pacific Gas and Electric Comcany TN 95 $@
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,W Attention: Mr. Philio A. Crane, Jr.
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'ssis ant Genera! Counsel j^
Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarced for your action witn regaro to your nuclear power facilities witn operating license or near tenn operating license (NTCI.).
To assist tne JRC in evaiuating cne vaiue/ impact of eacn bulletin on all licensees, i:..culo be neipiui if you would provice an estimate of the mancower esdaded in cne review dao preparation of tne report (s) required by the cuileti::. Pleasa esc:mata separately the manpower associated witn corrective ac;icas requireo by chis culletin.
Shculd you have any quas:1cas regarcing tais cullet 1n or the actions required of you, plasse contact this office.
Sincerely, i
- m. m.-y y
..z R. H. Engelken Director
Enclosures:
1.
Recently issued IE Bulletins cc w/ enclosures:
J. D. Shiffer W. Raymond. PG&E E. Weeks, PG&E Humcoldt Bay D
P102280[M
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 indicatt 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 replaced with new units produced by the same t
j manufacturer.
2.
On April 12, 1976, the St. Lucie Plant Unit 1 facility of Florida Power and Light Company submitted event report No. 50-335-76-9 wherein five l
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 I
report No. 77-23 for the Duane Arnold Energy Center facility that identi-fied 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.
l 4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (00E) facilities at Richland, Washington, to obtain information on DOE 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 systcm under-r SooSoc001f I
nuo No. of pages:
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