PNO-II-87-015A, on 870305,two High Temp Bearing Trips Occurred.Caused by Failure of California Controls Eutectic Type Temp Sensors.No Damage,Unusual Wear or Excessive Temps Revealed.Diesel Generator 1-B Journal Bearing Refurbished

PNO-II-87-015A:on 870305,two High Temp Bearing Trips Occurred.Caused by Failure of California Controls Eutectic Type Temp Sensors.No Damage,Unusual Wear or Excessive Temps Revealed.Diesel Generator 1-B Journal Bearing Refurbished

ML20207T523
Person / Time
Site:	Catawba
Issue date:	03/11/1987
From:	Crlenjak J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-87-015A, PNO-II-87-15A, NUDOCS 8703240096
Download: ML20207T523 (1)

-. .

March 11, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-87-15A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this date.

FACILITY: Duke Power Company Licensee Emergency. Classification:

Catawba Unit 1 Notification of Unusual Event Alert Docket No. 50-413 Rock Hill, South Carolina Site Area Emergency General Emergency X Not Applicable

SUBJECT:

UPDATE ON SHUTDOWN DJE TO DAMAGED DIESEL GENERATOR BEARING This PN updates PN0-II-87-15, issued March 6, h M7 Tha licensee reports that inspection of the journal bearing on the 1-B diesel generator, which led to an unscheduled shutdown of Unit 1, revealed no damage, unusual wear, or indications of excessive temperatures. The inspection was conducted by the licensee and th3 vendor, Transamerica Delaval. The bearing was refurbished anyway.

The cause of two high bearing temperature trips has been attributed to the failure of California Controls (CALCON) eutectic type temperature sensors in which solder, designed to melt at 228 degrees (F), melted prematurely due to the metallurgic composition of the solder.

The high bearing temperature trip function would be bypassed during emergency operation of the engine.

The diesel generator was successfully tested on March 9, and the Unit is being prepared for return to service.

Unit 2 was unaffected.

The State of South Carolina has been informed.

This PN is being issued for information purposes only.

Contact:

J. Crlenjak DISTRIBUTION:

H. Street MNBB Phillips E/W Willste MAIL:

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