ML19343B900
| ML19343B900 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 01/27/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Morisi A BOSTON EDISON CO. |
| References | |
| NUDOCS 8102180178 | |
| Download: ML19343B900 (1) | |
Text
.
[pn[tro m
o UNITED STATES ff 8
NUCLEAR REGULATORY COMMISJ10N n
~
g g'
2 m REGION I c-
%..... &*[
631 PARK AVENUE f
o, KING OF PRUSSIA, PENNSYLVANIA 19406 el r
JAN 2 7 qI.
,"[]
_[
dlj Docket No. 50-293 2
Boston Edison Company M/C Nuclear
~7 M
ATTN:
Mr. A. V. Morisi Nuclear Operations Support Manager 800 Boylston Street Boston, Massachusetts 02199 Gentlemen:
The enclosed IE Bulletin No. 81-01, " Surveillance of Mechanical Snubbers," is forwarded to you for action. A written response is required.
In order to assist the NRC in evaluating the value/ impact of each Bulletin on licensees, it would be helpful if you would provide an estimate of the manpower expended in conduct of the review and preparation of the report (s) required by the Bulletin.
Please estimate separately the manpower associated with corrective actions following identification of problems through the Bulletin.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
. Grier Director
Enclosures:
1.
2.
List of Rece~ntly Issued IE Bulletins CCNTACT:
D. L. Caphton (215-337-5266) i I
cc w/encls:
R. D. Machon, Nuclear Opuations Manager - Piljr'. Station
'810 218 0 ne k
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 Page 1 of 7 SURVEILLANCE OF MECHANICAL SNUBBERS Description of Circumstances:
Several instances of failures of mechanical snubbers supplied by International i
Nuclev Safeguards Corporation (INC) have been identified that indicate possible defic
- ies in thest snubbers.
A summary of the failures that have occurred is pr'_.ded below:
1.
On August 9, 1974, the Tennessee Valley Authority submitted event report l
BFAO-50-260/741'l identifying 11 of 14 INC Model MSVA-1A snubbers that were found increrable on Browns Ferry Nuclear Power Station Unit 2 and I
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 (DOE) facilities at Richland, Washington, to obtain information on DOE experience Test Facility (FFTF).
The DOE-owned 4,000 mechanical pipe restraints (sn DUPLICATE DOCUITNT FFTF examined more than 800 of these l
Entire document previously entered into system under:'
Sooror o 75 ANO No. of pages:
e