ML19270F375

LER 79-002/03L-0 on 790108:flow Biased Portion of Average Power Range Monitor B Inoperable.Caused by Operational Amplifier Failure.Circuit Board Replaced

ML19270F375
Person / Time
Site:	FitzPatrick
Issue date:	01/31/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19270F371	List: ML19270F370 ML19270F375
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902060321
Download: ML19270F375 (2)

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gTTACilMENT TO LER 79-002/03L-0 During normal operation, while performing Operations Surveillance Test, F-ST-5Q titled Flow Bias Functional Test, Average Power Range Monitor (APRM)

"B" was found with the flow biased portion of the instrument inoperable. Re-gardless of the flow signal present, the scram trip setpoint remained clamped at 1174. The instrument was bypassed and the other APRM channels were verified operabic in accordance with F-ST-5Q. The minimum number of operable instruments specified in Technical Specification, App :ndix A, Table 3.1-1 was always met.

Investigation revealed that an operational amplifier in the flow bias portion

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. _ the instrument had failed. The printed circuit board containing this circuit was replaced and the instrument was verified operational by performing instrument maintenance procedure, F-IMP-7.6 titled Neutron Monitoring System LPRM and APRM Instrument Maintenance. The instrument was returned to service.

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