ML20054J911
| ML20054J911 | |
| Person / Time | |
|---|---|
| Site: | Perry, Catawba, Harris, Grand Gulf, River Bend, Vogtle, Comanche Peak, Rancho Seco, Midland, Bellefonte, 05000000, 05000393, Washington Public Power Supply System, 05000559, 05000558, Hartsville, Phipps Bend, 05000573 |
| Issue date: | 06/23/1982 |
| From: | Mills L TRANSAMERICA DELAVAL, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-82-626-000 PT21-82-626, PT21-82-626-000, NUDOCS 8206300192 | |
| Download: ML20054J911 (2) | |
Text
I Transamenca n'";""/' 2 ";;"L, gglgggl t
550 85m Avenue P.O Box 2161 Oakland, Cahfornia 94621 (415) 577-7400 June 23, 1982 Director, Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Dee.r Sir:
In accordance with the requirements of Title 10, Chapter 1, Code of Federal Regulations, Part 21, Transamerica Delaval, Inc., hereby notifies the Comi-sion of a potential defect in a component of a DSRV or DSR Standby Diesel Generator. There exists a po;ential problem with the governor drive coupling which could result in engine ilon-availability.
Transamerica Delaval has supplied the DSR and DSRV engines, with the potential defect, to the following sites:
Middle South Energy Grand Gulf 74033/36 Gulf States Utilities River Bend 74039/40 Carolina Power & Light Shearon Harris 74046/49 Duke Power Company Catawba 75017/20 Cleveland Electric Illum.
Perry 75051/54 Tennessee Valley Authority Bellefonte 75080/83 Washington Public Power Unit 1 75084/85 Texas Utilities Services Comanche Peak 76001/04 Georgia Power Vogtle 76021/24 Washington Public Power Unit 4 76031/32 Consumers Power Midland 77001/04 Tennessee Valley Authority Hartsville/Phipps Bend _
77024/35 Taiwan Power Co.
Maanshaw Sta.- M,a>/
78006/09 Korea Electric Kori Sta. - 6 73 79029/32 SMUD Rancho'Seco 81015/16 The governor drive coupling is manufactured by (Koppers Co. Inc.) and in-stalled by Transamerica Delaval.
The potential defect is related to the material used in the couplings drive element. The material, a isoprene, was designed for atmospheric use and is not suitable for use in the high-temperature, oil atmosphere encountered in the engine's gear case. The rubber deteriorates rapidly and ultimately fails. While the coupling is ' fail-safe' and will mechanically lock-up when the element fails, sufficient frequency instability could be induced that would result in the engines tripping off-line.
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P.O. Box 2161 Oakland. Cahfornia 94621 A
(415) 577-7400 U.S. Nuclear Regulatory Commission June 23, 1982 Page 2 This problem has been reviewed by Engineering and the manufacturer, Koppers. The material for the drive element has been changed to neoprene, a suitable material for the application. The action necessary to correct this potential defect is to change out the existing drive-element and replace it with the new, more suitable material.
A copy of this letter will be sent to each of the cognizant parties as listed in paragraph 2, no later than July 15, 1982. Transamerica Delaval will furnish parts and technical services as required by request and in accordance with each individual contract.
Since the correction of this potential defect depends on action by others, we can not estimate when the action will be completed.
Very truly yours, I
L. L. Mills, Manager Quality Engineering LLM:hw
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