ML19331D620

RO 80-3:with Reactor on Mode 4,both Centrifugal Charging Pumps Automatically Started Injecting 535 Gallons of 20,000 Ppm Borated Water at 193 F Into Rcs.Caused by Incorrect Switch Manipulation During Test Performance

ML19331D620
Person / Time
Site:	Sequoyah
Issue date:	08/27/1980
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19331D616	List: ML19331D615 ML19331D620
References
NUDOCS 8009030373
Download: ML19331D620 (1)

Text

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• a O Special Report 80-3 Sequoyah Nuclear Plant Unit 1 ECCS Injection To Reactor Coolant System Plant Status Mode 4 Reactor Pressure 350 psig Reactor Temperature 220 F Event Description and Probable Consequences Both Centrifugal Charging pumps automatically started injecting approximately 535 gallons of 20,000 ppm borated water at 1930F into the reactor coolant system.

This is the first safety injection system actuation for Unit 1.

This event occurred at moderate reactor temperatures and, there-fore, requires no fatigue cycle damage evaluation.

Cause Description and Corrective Action The automatic initiation was caused by iacorrect switch manipula-tion during the performance of pressurizer pressure channel III functional test, IMI-99-iT 4.3. A contributing factor to the cause was that the procedure was temporarily altered (in accordance with approved plcnt instructions) to meet the plant conditions at the time of the test.

The safety injection was terminated, one minute af ter the SI signal was actuated, and the reactor coolant system was restored to pre-initiation conditions. The procedure in question has been permanently revised to minimize any auch future occurrences. Maintenance personnel have been cautioned to more closely observe written procedures, espe-cially when new or different methods are being employed.

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