ML19211A810
| ML19211A810 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/26/1979 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-79-23, NUDOCS 7912210105 | |
| Download: ML19211A810 (2) | |
Text
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.s Omaha Public Power District 1623 HARNEY a OMAHA. NEBRASKA 68102 e TELEPHONE 536-4000 AREA CODE 402 October 26, 1979 Mr. K. V. Scyfrit, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011
Reference:
Docket No. 50-285
Dear Mr. Seyfrit:
The Omaha Public Power District received IE Bulletin 79-23, dated September 12, 1979, requesting information in regard to diesel generator field exciter transformer failure. Accordingly, the attached information is provided to respond to that request.
Sincerely, e
W.C/ Jones Division Manager Production Operations WCJ/KJM/BJH:Jem
- Attach, cc:
U. S. Nuclear Regulatory Commission Office of Inspection & Enforcement Division of Reactor Operations Inspection Washington, D. C.
20555 LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N. W.
Washington, D. C.
20036 1635 268 p
7 912210
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a, Attachment "eouest 1 Determine whether or not connections have been made between lov KVA rated transformers and high KVA rated EDGs without adequate limitations on the flow of circulating currents.
If applicable, provide a description of the corrective action being taken to address this problem.
Response
There are no connections made between the low KVA rated trans-f6rmer (excitation transformer) and the generator at the neutral on either diesel genarator located at the Fort Calhoun Station.
Therefore, no corrective action on the District's behalf is re-quired or scheduled.
Request 2 Provide a schedule for the completion of a sustained full-load operation test of the EDGs for a duration of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or provide the results of the similar long duration, full-load test which has already been completed on the EDGs installed at your faci-lity.
The test should demonstrate full-load carrying capability for an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, of which 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> should be at a load equivalent to the continuous rating of the diesel generator and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at a load equivalent to the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> rating of the diesel generator. The test should also verify that vejt-age and frequency requirements are maintained and that the cooling system functions within design limits.
Response
The District vill test Fort Calhoun Station emergency diesel generators in a manner described above during the upcoming refuel-ing outage, which is presently scheduled to begin approximately January 17, 1980.
i635 269
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