ML20063N847
| ML20063N847 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 09/20/1982 |
| From: | Root R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, G1-82-569, GO1-82-0569, GO1-82-569, NUDOCS 8210070297 | |
| Download: ML20063N847 (2) | |
Text
1 Docket nos. 50-460/513 50.55(e) Report
?h'i?g Washington Public Power Supply System.
P.O. Box 968 3000 Georgo Washington Way Richla nd, Washington 99352 ? ( 50p)24 372-5000 p.,
Docket Number 50-460 and 50-513 7
Septeiter20,1982
Oc,
G01-82-0569 Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Attention:
Mr. D. M. Sternberg Chief, Reactor Projects Branch No.1 Subj ect:
SUPPLY SYSTEM PROJECTS 1 AND 4 10CFR50.55(e) REPORTABLE CONDITION EMERGENCY DIESEL GENERATOR GOVERN 0R DRIVE COUPLING
Reference:
Telecon, C.R. Edwards, Supply System to P.P. Narbut, Region V, Nuclear Regulatory Commission, August 19, 1982.
In the above reference, the Supply System informed your office of a reportable deficiency in accordance with the requirements of 10CFR50.55(e).
Attachment A includes a brief description of the identified deficiency and the Project's planned corrective action. Due to the construction delay of the WNP-1 Project, the required corrective action will not be implemented until come time af ter restart.
We will provide your office with interim status reports on an annual basis.
If you have any questions or desire further information, please advise.
R. W. Root Acting Program Director RWR:mb Attachment cc:
V. Stello, Director of Inspection, NRC A. Toth, NRC J.D. Bateman, UE&C 895 J. P. Laspa, Bechtel 861 jQ]
V. Mani, UE&C 897 G. Valert _enyi, UE&C, PA 08U6 t
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i*B210070297 820920
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ATTACHMENT A WNP-1/4 DOCKET NOS. 50-460 AND 50-513 REPORTABLE CONDITION PER 10CFR50.55(e)
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EMERGENCY DIESEL GENERATOR GOVERNOR DRIVE COUPLING l
I Backgrou nd The Supply System purchased Emergency Diesel Generators, two per plant, from Transamerica Delaval. A problem exists with the material used for the governor drive coupling which could result in loss of engine availability.
Transamerica Delaval has reported this deficiency under the requirements of 10CFR Part 21.
Description of the Deficiency The governor drive coupling is manufactured by Koppers Co. Inc. and is installed by Transamerica Delaval. The potential defect is related to the isoprene material used in the governor drive coupling elements. The isoprene material was designed for ctmospheric use and is not suitable for use in the high temperature and oil atmosphere encountered in the engine's gear case.
The isoprene rubber deteriorates rapidly and ultimately fails.
Safety Implications The governor coupling is " fail-safe" and will mechanically lock-up when the element fails, but sufficient frequency instability could be induced that would result in the engine trippin0 off line.
Corrective Action Review of the problem by the manufacturer and Transamerica Delaval resulted in changing the material for the drive element to neoprene. Neoprene is a suitable material for the application.
A field change document has been prepared and approved by the Architect Engineer to implement the changeout of the coupling drive element material.
i Installation will be performed by a site contractor after restart of WNP-1.
For WNP-4, the change will t e filed and tracked until disposition of WNP-4 is known.