ML19343B880
| ML19343B880 | |
| Person / Time | |
|---|---|
| Site: | 05000516, 05000517 |
| Issue date: | 01/27/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Chon Davis LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 8102180106 | |
| Download: ML19343B880 (1) | |
Text
__
p tag g
+
o UNITED STATES
~. 3 E
t NUCLEAR REGULATORY COMMISSION 3
s REGION I e,,
f
$31 PARK AVENUE
%, ** D,o#
KINO OF PRUS$1A. PENNSYLVANIA 19406 Docket Nos. 50-516 50-517
- j
_",3 Long Island Lighting Company
=5 11 ATTN: Mr. Charles P. Davis Senior Vice President 250 Old Country Road Mineola, New York 11501 Gentlemen:
The enclosed IE Bulletin No. 81-01, " Surveillance of Mechanical Snubbers," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, CC Boy e H. Grier Director
Enclosures:
1.
List of Recently Issued Bulletins CONTACT:
D. L. Caphton (215-337-5266) cc w/encls:
J. P. Novarro, Project Manager Edward M. Barret'., Esquire Edward J. Walsh, Esquire i
l T. F. Gerecke, Manager, Engineering QA Department l
l l
~810 218 0 LOW Qt l
SSINS No.-
6820 Accession No.:
8005050075 UNITED STATES NUCLEAR REGULATORY CCMMISSICN OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 i
January 27, 1981 Page 1 of 7 SURVEILLANCE OF MECHANICAL SNUBBERS Descriotion of Circumstances:
I Several instances of failures of mechanical snubbers supplied by International Nuclear Safeguard: Corporation (INC) have been identif'(1 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 l
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 Mocel 1MSVA-1 Type AS snubbers to be frozen; the cause of failure was attributed to large amounts of interior oxidaticn.
The units were replaced with those produced by another manufacturer.
On Decemcer 5, 1979, personnel from the Nuclear Regulatory Commission 4.
visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on 00E experience wi Test Facility (FFTF).
The 00E-owned 4,000 mechanical pipe restraints (sn DUPLICAC DOCUMENT FFTF examined more than 800 of these Entire document previously entered into system under:"
bDYO$
o 75 ANO No. of pages:
U
.