05000302/LER-1979-069-03, /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

/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: 05000302/LER-1979-069, Forwards LER 79-069/03L-0 05000302/LER-1979-069-03, /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
References
LER-79-069-03L, LER-79-69-3L, NUDOCS 7908290457
Download: ML19207B444 (3)

LER-1979-069, /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

Event date:
Report date:
3021979069R03 - NRC Website

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,,, i during the performance of Surveillance Procedure SP-354 This created an event contrary to Technical Specification 3.8.1.1.

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This is the first occurrence of this type reported.

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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