ML20064E725

/03L-0 on 781016:the a Train Undervoltage Relay 27-1 on RCP 1A Failed to Trip at Required Setpoint During Test Procedure FNP-1-612.0 Due to Setpoint Drift

ML20064E725
Person / Time
Site:	Farley
Issue date:	11/13/1978
From:	Hairston W ALABAMA POWER CO.
To:
Shared Package
ML20064E723	List: ML20064E720 ML20064E725
References
LER-78-078-03L, LER-78-78-3L, NUDOCS 7811210358
Download: ML20064E725 (1)

Text

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EVENT DESCR6PTION AND PROBABLE CONSEQUENCES h I o i 2 I l While performing surveillance test procedure FNP-1-STP-612.0, RCP Bus Undervoltage  !

o l3 j g Reactor Trip Undervoltage Relay Functional Test, on RCP 1A the A train undervoltage I l o l 4 I i relay (27-1) failed to trip at the required setpoint. The relay dropout voltage was l lo Isl I found to be 76.06V (acceptable range 76.6V to 77.8V, T/S req't. is 77.43V). T/S 3.3.111 l o is 1 I requires a mini =u

2 of 2 of 3 RCP bus undervoltage channels to be operable. The channel

[TTT] l was declared inoperable at 1645 on 10/16/78 and wac returned to an operable status at I g, j g 1720 on 10/16/73. T/S 3.3.1.1 action statement requirements were met. The health andt W

i e e sarety or gagualig,ere noggfiected by this occurrence.

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34 36 3J 40 44 44 47 CAUSE CESCRIPTION AND CCRRECTIVE ACTIONS h li1olISetpoint drift. The relay drocout voltage was reset to 77.62V and FNP-1-STP-612.0 l li li l l was satisf actorily comoleted. I a EI I l i l 31 l 1 Ii t 4 I I I

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