05000272/LER-1979-060-03, /03L-0:on 790907,several Safeguard Sys Could Not Be Reset Due to 28-volt Dc Control Power Breakers Being Tripped.Caused by 28-volt Dc Breaker Being 1-amp Breaker While Circuit Load Is Approx Two Amps

/03L-0:on 790907,several Safeguard Sys Could Not Be Reset Due to 28-volt Dc Control Power Breakers Being Tripped.Caused by 28-volt Dc Breaker Being 1-amp Breaker While Circuit Load Is Approx Two Amps

ML18079B095
Person / Time
Site:	Salem
Issue date:	10/05/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18079B094	List: 05000272/LER-1979-060, Forwards LER 79-060/03L-0 05000272/LER-1979-060-03, /03L-0:on 790907,several Safeguard Sys Could Not Be Reset Due to 28-volt Dc Control Power Breakers Being Tripped.Caused by 28-volt Dc Breaker Being 1-amp Breaker While Circuit Load Is Approx Two Amps
References
LER-79-060-03L, LER-79-60-3L, NUDOCS 7910110345
Download: ML18079B095 (1)

LER-1979-060, /03L-0:on 790907,several Safeguard Sys Could Not Be Reset Due to 28-volt Dc Control Power Breakers Being Tripped.Caused by 28-volt Dc Breaker Being 1-amp Breaker While Circuit Load Is Approx Two Amps

Event date:
Report date:
2721979060R03 - NRC Website

text

NRC FORM 366 t1-n1, e

U. -CLEAR REGULATURY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK:.___..._....__~_._ _ _.____,I 8 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

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[]JI] I During performance of 18 month surveillance of safeguards systems and RMS con-C£:liJ IIITJ [ill]

tainment isolation functional test, several safeguard systems could not be reset due to the 28 volt DC control power breakers being tripped.

Performance Department investigated the problem and initiated corrective action.

Functional tests of the safeguard system during normal operation have been performed satisfactorily to verify system operability.

This is the first occurrence of this type.

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LEA RO ['.VENT YE.A.A

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20 l::=l 31 PRIME C.OMP.

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43 I The cause of this occurrence was the 28 volt DC breaker is a 1 amp load breaker while possible circuit load is approximately 2 amps.

The breakers are being [JJ1J I replaced under DCR lPD-0153 with 2 amp breakers.

The DCR will be implemented prior to entry into Mode 4.

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