ML19207B444

LER 79-069/03L-0 on 790724:emergency Diesel Generator Had Excessive Exhaust Manifold Temps & Fire Exiting Exhaust Muffler.Caused by Air Leak on Turbocharger Discharge.Air Leak Repaired & Generator Returned to Svc

ML19207B444
Person / Time
Site:	Crystal River
Issue date:	08/16/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19207B440	List: ML19207B439 ML19207B444
References
LER-79-069-03L, LER-79-69-3L, NUDOCS 7908290457
Download: ML19207B444 (3)

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, 2 l At 0700 in Mode 4, it was reported that "B" Emergency Diesel Generator had l

,g, excessive exhaust manifold temperatures and fire exiting the exhaust muffler [

, ,, i during the performance of Surveillance Procedure SP-354 This created an  !

event contrary to Technical Specification 3.8.1.1. Redundancy NA. Na  !

,g , effect upon the plant or general public as the plant remained in a safe j

, , shutdown condition. This is the first occurrence of this type reported. l 344  !

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leak on the turbocharger discharge. The air leak was repaired and "B"  !

,,, ; 'Mesel Generator was returned to service at 2330 on 25 Julv 1979 followine !

, , , satisfactory completion of CP-354. ,

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(SEE ATTACED SUPPLEMENTARY INFORMATION SEET) 790829 y p

SUPPLEMENTARY INFORMATION Report No.: 50-302/79-069/03L-0 Facility: Crystal River Unit #3 Report Date: 16 August 1979 Cccurrence Date: 24 July 1979 Identification of Occurrence:

"B" Emergency Diesel Generator inoperable contrary to Technical Specification 3.8.1.1.

Conditions Prior to Occurrence:

Mode 4 hot shutdown.

Description of Occurrence:

At 0700 during the performance of SP-354, it was reported that "B" Emergency Diesel Generator had excessive exhaust manifold temperatures and fire exiting the exhaust muffler. The Diesel Generator was rendered inoperable. Trouble-shooting and testing revealed the following:

1) Engina operation appeared " rich"

2) Air leak noted on turbocharger discharge

3) Exhaust manifold leakage

4) Higher than expected cylinder and exhaust manifold temperatures.

Maintenance actions were initiated and "B" Emergency Diesel was returned t- service at 2330, 25 July 1979 following satisfactory completion of SP-354.

Designation of Ap,arent Cause:

The cause of this event, is attributed to fuel accumulation in the exhaust manifold resulting from a " rich" fuel mixture caused by an air leak in the turbocharger discharge.

Analysis of Occurrence:

No effect upon the plant or general public as the plant remained in a safe shutdown condition.

853 330

Corrective Action:

Repairs were initiated to prevent leakage on the exhaust manifold and turbocharger discharge. As a result of these repairs, diesel exhaust temperatures and engine cylinder temperatures were corrected.

Further testing displayed satisfactory operation of the diesel and the diesel generator was returned to service.

Subsequent preventive maintenance and inspection activities will be performed as soon as possible upon receipt of repair parts.

Failure Data:

This is the first occurrence of this type reported.

853 331