05000250/LER-1979-028-03, /03L-0:on 791001,auxiliary Feedwater Pump a Failed to Start.Caused by Inoperability of Auxiliary Feedwater Steam Turbine Pressure Control Valve CV-3705.Low Points of Instrument Air Sys Drained

/03L-0:on 791001,auxiliary Feedwater Pump a Failed to Start.Caused by Inoperability of Auxiliary Feedwater Steam Turbine Pressure Control Valve CV-3705.Low Points of Instrument Air Sys Drained

ML17338B235
Person / Time
Site:	Turkey Point
Issue date:	10/22/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17338B234	List: 05000250/LER-1979-028, Forwards LER 79-028/03L-0 05000250/LER-1979-028-03, /03L-0:on 791001,auxiliary Feedwater Pump a Failed to Start.Caused by Inoperability of Auxiliary Feedwater Steam Turbine Pressure Control Valve CV-3705.Low Points of Instrument Air Sys Drained
References
LER-79-028-03L, LER-79-28-3L, NUDOCS 7911060389
Download: ML17338B235 (4)

LER-1979-028, /03L-0:on 791001,auxiliary Feedwater Pump a Failed to Start.Caused by Inoperability of Auxiliary Feedwater Steam Turbine Pressure Control Valve CV-3705.Low Points of Instrument Air Sys Drained

Event date:
Report date:
2501979028R03 - NRC Website

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The "A" AFW pump fai 1ed to s tart ~

The "B" and "C" AFW were operable and available.

The problem was corrected, and the "A" AFM pump was tested and returned to service within 16 minutes.

Reference similar occurrence:

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REPORTABLE OCCURRENCE 250-79-28 LICENSEE EVENT REPORT PAGE TWO Additional Cause Descri tion and Corrective Action:

The failure of the "A" AFW pump to start resulted from inoperability of CV-3705 (A AFW steam turbine pressure control valve).

The root cause of the inoperability was water introduced into the instrument air system when temporarily connected to the Unit Nos.

1 and 2 service air system.

This temporary connection was established to. provide the required air capacity while one of the IA system compressors was out of service for maintenance.

~ II The pneumatic controller was returned to operable status.

The A

AFW pump was successfully tested and returned to service within 16 minutes.

J Corrective action included draining low points of the IA system.

Additionally, administrative controls are being established to increase the surveillance frequency on the IA system to detect the presence of water.

Long term corrective action will include upgrading both the IA and AFW systems.

The IA upgrade includes enhancements to the filters, desiccant

dryers, and monitoring and control systems.

This modification is currently scheduled to be completed during the first quarter of 1981.

The AFW upgrade includes both the replacement of the existing turbine casings with casings rated for full steam pressure and the elimination of the pressure reduction controls associated with the AFW steam turbines.

This modification is currently scheduled to be completed during the second quarter of 1981.

We believe that the interim and long term corrective action should preclude future occurrences of this type.

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