ML18348A637

Unusual Event Report No. 75-9 Covering High Cylinder and Exhaust Temperatures Associated with the Operation of a Diesel Generator

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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• PDWJr company General Offices: 212 West Michigan Avenue, .Jackson, Michigan 49201

• 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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• 1. Report Number:

UNUSUAL EVENT REPORI' Palisades Nuclear Plant 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 *