ML20003B587
| ML20003B587 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/27/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 8102120505 | |
| Download: ML20003B587 (1) | |
Text
P
'o UNITED STATES 8 ~ j e, -
NUCLEAR REGULATORY COMMISSION REGION 11 c
3
. [
101 MARIETT A sT., N.W.. SUITE 3100 o,
b ATLA TA, GEORGI A 30303
_o N 2 / 1981 In Reply Refer To:
RII,:JPO Q0-395,
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South Carolina Electric and Gas Company kl g
f ATTN:
T. C. Nichols, Jr., Vice President 9-Power Production and Systems Operations pfB 0.7 79gIF P. O. Box 764 y' *-
K;sil Columbia, SC 29218 IDdroer j
AF Gentlemen:
4/
\\
N The enclosed IE Bulletin No. 81-01 is forwarded for your action with regard to your nuclear power facility.
To assist the NRC in evaluating the valne/ impact of each bulletin on all t' e licensees, it would be helpful if you would provide an estimate of a
manpower expended in the review and preparation of the report (s) required by the bulletin.
Please estimate separately the manpower associated with ecerective actions required by this bulletin.
Should you have any questions regarding this bulletin or the actions required by you, please contact this office.
Sincerely, R N, w f_
g James P. O'Reilly Director
Enclosures:
1.
List of Recently Issued IE Bulletins cc w/ encl:
A.
. Smith, Site QA Coordinator J. b. Knotts, Jr O. S. Bradham, Manager Nuclear Operations 82oc12 5'o5
SSINS No.:
6820 Accession No.:
8005050075 IEB 81-01 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Janua ry 27, 1981 IE Bulletin No. 81-01:
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 BFA0-50-260/741W 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 Station 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 I facility of Florida Power j
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 l
and by improper assembly. All INC mechanical naubbers 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-fied 13 INC Model IMSVA-1 Type AS snubbers to be frozen; the cause of failure was attributed to large amounts of interiot oxidation. The units were replaced with those produced by another manufacetrer.
l l
4.
On December 5,1979, personnel from the Nuclear Regulatory Cemnission visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on DOE experience with INC snubbers at the Fast Ilux Test Facility (FFTF).
The DOE-owned FFTF was equipped with more than ubbers) supplied by INC.
In 1978, i
l mechanical snubbers by removing them t 43, or about 5% of those examined, l
DUPLICATE DOCUMENT er construction so the snubbers had d to only normal construction Entire document previously entered into system under:
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l No. of ages:
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