ML19341C057
| ML19341C057 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 01/27/1981 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 8102280552 | |
| Download: ML19341C057 (1) | |
Text
Sk M
.d i ED 3 TATE':
[
.,.,,( R' j
""' " ATr'P v CC.1"1 t S9iOM 5 m n ",no o['
i t ' U T C E E : Pt ' M
'r Y-t 9....."-
a r-ceu m mm wc January 27, 1981 N
Docket tio. 50-344
&r f'4 F 'ON a) 'N:.:,
- J Portland General Electric Company
- 4. '
FE8 0 51981 121 S. U. Salmon Street r
- 1:
Portland, Orecon 9 ~/ 204
( M M*p'r'.Q /
.s
[
Attention:
Mr. tsart u. Witners
'! ice Pres 1 cent Nuclear q'/
i g
Gentlemen:
The enclosed IE Bulletin fio. 81-01 is torwarced for your action with regara to your nuclear povier rectiitles witn operating iicense or near term operating 1icense GiTGL).
To assist the iiRC in evaluaung tne value/ impact of eacn bulletin on all licensees, it acuid be neipius if you v.ouiu provide an estimate of the manpower expended in Ene t wies and preparation of the report (s) required by the ouiletin.
Ilease eau.nate separaceiy the manpower associated with corrective actions requirca oj tnis builetin.
Should you have any csacmas regaruing cnis oulletin or the actions required of you, please contact this office.
Sincerely, R
H. Engelken Director
Enclosures:
1.
IE Bulletin flo. G1-01 2.
Recently issued IE Eulletins cc w/ enclosures:
C. P. Yundt, PGE J. W. Durham, PGE P
8102280fM 1
SSINS No.:
6820 Accession Nc.
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 SUP./EILLANCE 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 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 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 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 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 (00E) facilities at Richland, Washington, to obtain information on DOE experience Test Facility (FFTF).
The DOE-owned t
4,000 mechanical pipe restraints (sn DUPLICATE DOCUMENT FFTF examined more than 800 of these Entire document previously entered into system under:'
Soosoc00 S
ANO No. of pages:
4
-