ML18348A637
| ML18348A637 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 08/14/1975 |
| From: | Bixel D Consumers Power Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| UE-75-9 | |
| Download: ML18348A637 (2) | |
Text
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- Area Code 517 788-0550 August 14, 1975 Division of Reactor Licensing US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255, LICENSE DPR-20, PALISADES PLANT, UE-75-9 Attached is Unusual Event Report No. 75-9 covering high cylinder and exhaust temperatures associated with the operation of a Palisades diesel generator *
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- David A. Bixe 1 Assistant Nuclear Licensing Administrator CC:
JGKeppler, USNRC
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UNUSUAL EVENT REPORI' Palisades Nuclear Plant
- 1.
Report Number:
UE-75-9, Docket 50-255 2a. Report Date:
August 14, 1975 2b. Occurrence Date:
August 4, 1975
- 3. Facility: Palisades Plant, Covert, Michigan
- 4.
Identification of Occurrence: Diesel Generator 1-1 high cylinder and exhaust temperatures.
- 5.
Conditions Prior to Occurrence:
Plant operating at steady-state power of 6~.
- 6.
Description of Occurrence:
During the monthly testing of Diesel Generator 1-1 (August 4, 1975) cylinder temperatures reached approximately ll00°F af'teri5 to 20 minutes of operation. The diesel generator was fully loaded at 2.5 MWe.
Typical operating temperatures are 950° to l000°F with
. temperatures as high as 1200°F considered acceptable although not desirable The diesel generator load test was terminated and the unit declared inoperable in accordance with Palisades Technical Specification 3.7 (i).
- 7. Designation of the Apparent Cause of the Occurrence:
Failure of a bellows support bracket resulted in an exhaust manifold bellows failure.
This failure caused a decreased exhaust flow to the turbosupercharger (which resulted in a low air intake manifold pressure) _and an increase of about 100 F in the cylinder temperatures.
- 8. Analysis of Occurrence:
The Palisades Technical Specification permits the diesel generator* to be out of service for a limited period of time.
In addition, if the diesel would have been required it would have been placed in service and would perform its design function.
- 9.
Corrective Action: The bellows support bracket was repaired and new exhaust manifold bellows installed. In addition, the diesel generator testing procedures are being reviewed with respect to acceptable cylinder wall temperatures.
- 10. Failure.Data:
No preVious failure of this type have been recorded *