ML19345G203
| ML19345G203 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 03/02/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8103170053 | |
| Download: ML19345G203 (1) | |
Text
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T / C-
' %'a, UNITED STATES
-Ow NUCLEAR REGULATORY COMMISSION 3.. q.
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%*,7 #,-
f REGION IV
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611 RYAN PLAZA DRIVE, SUITE 1000
?,o ARLINGTON. TEXAS 76011 March 2, 1981 CO d
Docket No.
50-285 EMR111997,h E "%gur%
Onaha Public Power District 12 ATTN:
W. C. Jones, Division Manager -
x Production Operations q
Onaha, Nebraska 63102
--/(f 1623 Harney Street
/Q7 Gentlemen:
The enclosed IE Circular is forwarded for your infonnation. No written response to.this circular is required.
If you have any questions related to this matter, please contact this office.
Sincerely,
(-
- Ul G%Lw JW
/ -
g.
Karl V. Seyfrit Di rector
Enclosures:
.1.
IE Circular No. 81-03 2.
List of Recently Issued l
IE Circulars.
.cc:
S. C. Stevens, Manager Fort Calhoun Station Post Office Box 98 l
Fort Calhoun, Nebraska 68102 l
81081704S3
SSINS No.:
6820 Accession No.:
8005050075 IEB 81-01 UNITED STATE.1 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 January 27, 1981 IE Bulletin No. 81-01: SURVEILLANCE OF MECHANICAL SNUESERS Descriction of Circumstances:
Several icstances of failures of mechanical snubbers supplied by International Nuclear Safeguard: 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 identifying 1: of 14 INC Model MS/A-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 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 'nternals
.and by improper. assembly. All.INC mechanical snubbers were replaced with units produced by ano'ther manufacturer.
3.
On April 8,1977, Iowa Electric Light and Power Company subcitted event report No. 77-23 for the Duane Arnold Energy Center facility that identi-fled 13 INC Model lilSVA-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.
l 4.
On December 5, 1979, personnel from the Nuclear Regulatory Commission visited Department of Energy (DOE) facilities at Richland, Washington, to obtain information on DCE experience with INC snubbers at the Fast Flux 7est Facility (FFTF). The DOE-owned FFTF was equipped with more than 4,000 mechanical pipe restraints (snubbers) supplied by INC.
In 1978, FFTF examined more than 800 from tneir hstallation and d DUPLICATE DOCUMENT were frozen. The plant was en seen no service and had bee d Entire document previously l
environ =ents for 1 to 2 yea d
entered into system under:
8005050075*
[
nuo Attachment.
.. s Recently is'ue'd IE bull'etins d
No. of pages:
7,
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.