ML19341C051
| ML19341C051 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/27/1981 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8102280535 | |
| Download: ML19341C051 (1) | |
Text
M c.3
,~.,
v.a TE D STAT:s J
N I^
't
.ICL m orqui aTnnu cc.aMisr, ton s.;k,lg)2/, y ec:cy v 2
, i c w r e r u z r ~a t r,,, n o o, 3 ;.a r ^
A l ". U I C ' t " i T' t 3 7 /s 4
m.ur cv~. cmronm a rm January 27, 1981 Docket No. 50-206 9
4
.O N
hy(
g Southern California Edison Company M [Og$"Mgp h J /
P. O. Box 800 2244 Walnut Grove Avenue o'
- b-fj T Roseread, California 91770 9+h.g#
.?
J fp$
4 Attention:
Dr. L. T. Paca'/, Vice President g
Advanced Engineering 4
6 Gentlemen:
The enclosed IE Bulletin No. 81-01 is forwarded for your action with regard to your nuciear power facilities with operating license or near term operating license (nTCL).
To assist the NRC in evaluating cne value/ impact of each bulletin on all licensees, ii. i. auld be helpful if you would provide an estimate of the manpower expended in the review anc preparation of the report (s) required by the buller.iri.
Please estimate separately the manpower associated with corrective actions requircd cy this bulletin.
Should you have any que3 r. ions regarding this bulletin or the actions required of you, please contact this office.
Zincerely,
. r-r
,, 3.x s. -
R. H. Engelken Director
Enclosures:
1.
Recently issued IE Bulletins cc w/ enclosures:
J. M. Curran, SCE R. Dietch, SCE 022805 35 g3
SSINS No.:
6820 Accession ao.:
8005050N5 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 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 iu ntifying 11 of 14 INC Model MSVA-1A snubbers that were found inoperable on Browns Ferry Nuclear Power Station Unit 2 and subsequently identifiee 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.
l The failed snubbers were replaced with new units produced by the same I
manufacturer.
2.
09 April 12, 1976, the St. (.ucie Plant Unit 1 facility of Florida Power and Light Company submitted event renort 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.
l 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-l fied 13 INC Model IMSVA-1 Type AS snubbers to be frozen; the cause of i
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 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 system under:'
Soosoc00 S
ANO No. of Pages:
'- " ' ' ~ -
_ _,