ML19345G046
| ML19345G046 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 01/27/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| References | |
| NUDOCS 8102190826 | |
| Download: ML19345G046 (1) | |
Text
-
gme UNITED STATES o
y '
NUCLEAR REGULATORY COMMISSION
.g r.r REGION 111 8
799 ROOSEVELT ROAD o
E GLEN ELLYN, ILLINOIS 60137 o
January 27, 1981 Gentlemen:
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 value/ impact of each bulletin on all licensees, it would be helpful if you would provide an estimate of the manpower expended in the review and preparation of the report (s) required by the bulletin.
Please estimate separately the manpower associated with corrective actions required by this bulletin.
Should you have any questions regarding this bulletin or the actions required of you, please contact this office.
Sincerely, wh[
s j James G. Keppler Director
Enclosure:
IE Bulletin No. 81-01 TI63190 sob Q
4 Docket No. 50-409 pairyland Power Cooperative ATTN:
Mr. F. W. Linder General Manager 2615 East Avenue - South La Crosse, WI 54601 cc w/ enc 1:
R. E. Shimshak, Plant Superintendent Central Files AD/ Licensing AD/ Operating Reactors AEOD Resident Inspector, RIII PDR Local PDR John Duffy, Chief Boiler Inspector S
o o
R{
)
D W..=2 9 that s. $
2 JAN
,w, e
i 8109ia0 %,
f.
Q
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 i
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
.i 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 'ound 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 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.
4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (00E) facilities at Ricnland, Washington, to obtain information on DOE experience w 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:
bbOYO $b0 YT ANO No. of pages:
- -n
~ ~
,e--.---
_