05000250/LER-1980-018-03, /03L-0:on 800926,during Recovery from Unit Trip, Auxiliary Feedwater Pump a Failed to Completely Deliver Required Flow to Feed Steam Generator B.Caused by Water in Pneumatic Controls from Instrument Air Sys

/03L-0:on 800926,during Recovery from Unit Trip, Auxiliary Feedwater Pump a Failed to Completely Deliver Required Flow to Feed Steam Generator B.Caused by Water in Pneumatic Controls from Instrument Air Sys

ML17340A322
Person / Time
Site:	Turkey Point
Issue date:	10/22/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17340A321	List: 05000250/LER-1980-018, Forwards LER 80-018/03L-0 05000250/LER-1980-018-03, /03L-0:on 800926,during Recovery from Unit Trip, Auxiliary Feedwater Pump a Failed to Completely Deliver Required Flow to Feed Steam Generator B.Caused by Water in Pneumatic Controls from Instrument Air Sys
References
LER-80-018-03L-01, LER-80-18-3L-1, NUDOCS 8010310433
Download: ML17340A322 (3)

LER-1980-018, /03L-0:on 800926,during Recovery from Unit Trip, Auxiliary Feedwater Pump a Failed to Completely Deliver Required Flow to Feed Steam Generator B.Caused by Water in Pneumatic Controls from Instrument Air Sys

Event date:
Report date:
2501980018R03 - NRC Website

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'AFW pump was started to feed the "8" steam generator, but the pump failed to corn letel deliver the re uired flow.

The "8" and "C" AFW pumps were available.

Subse uent to an evaluation of the problem, the pump was tested satisfactorily.

Reference similar occurrences:

LER 250-79-19 and LER 250-79-28.

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um was due to water which had been introduced into the pneumatic controls from the instrument air (IA) system while the IA dryers were out of service for maintenance.

Corrective actions are discussed in the attachment.

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Additional Cause Descri tion and Corrective Actions:

The root cause of the inoperability of the 'A'FW pump was water introduced into the instrument air (IA) system when the IA dryers were out of service for maintenance.

Corrective action included draining low points of the IA system and calibrating the AFW pneumatic controls.

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.

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

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