ML19259D658

LER 79-092/03L-0:on 790925,in Mode 1,Halon Recirculation Fans FSF-1 & FSF-2 Failed to Start During Functional Test. Caused by Faulty Design Which Rendered Motor Overloads Inadequate for Fan Operating Characteristics

ML19259D658
Person / Time
Site:	Crystal River
Issue date:	10/17/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19259D651	List: ML19259D650 ML19259D658
References
LER-79-092-03L, LER-79-92-3L, NUDOCS 7910250358
Download: ML19259D658 (2)

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SUPPLEMENTARY INFORMAT'.ON Report No.: 50-302/79-092/03L-0 Facility: Crystal River Unit #3 Report Date: 17 October 1979 Occurrence Date: 25 September 1979 Identification of Occurrence:

Halon Recirculation Fans, FSF-1 and FSF-2 inoperable contrary to Technical Specificatio.1 3.7.11.3.

Conditions Prior to Occurrence:

Mode 1 Power Operatio (997.)

Description of Occurrence:

At 1032, it was reported that Halon Recirculation Fans FSF-1 and FSF-2 would not start during the performance of SP-501, Halon System Functional Test. Initial investigation revealed that the motor overloads were tripped. Subsequent functional testing could find no apparent cause for this event. FSF-1 and FSF-2 were re-turned to service following satisfactory completion of SP 501.

Designation of Apparent Cause:

Subsequent investigation has revealed that the cause of this event is attributed to improper design. It was determined that the motor overloads we e not adequate for fan operating characteristics.

Analysis of Occurrence:

No effect upon the plant or general public.

Corrective Action:

An engineering evaluation is being conducted to review this occurrence and provide appropriate corrective action.

Failure Data:

This is the first occurrence of the type reported.

12i1 947