05000366/LER-1980-128-03, /03L-0:on 800905,reactor High Pressure Instruments 2B21-N023C & D Actuated Above Tech Specs.Caused by Setpoint Drift.Switches Recalibr & Tested Successfully

/03L-0:on 800905,reactor High Pressure Instruments 2B21-N023C & D Actuated Above Tech Specs.Caused by Setpoint Drift.Switches Recalibr & Tested Successfully

ML19347A916
Person / Time
Site:	Hatch
Issue date:	09/23/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347A909	List: 05000366/LER-1980-128-03, /03L-0:on 800905,reactor High Pressure Instruments 2B21-N023C & D Actuated Above Tech Specs.Caused by Setpoint Drift.Switches Recalibr & Tested Successfully
References
LER-80-128-03L, LER-80-128-3L, NUDOCS 8009300526
Download: ML19347A916 (2)

LER-1980-128, /03L-0:on 800905,reactor High Pressure Instruments 2B21-N023C & D Actuated Above Tech Specs.Caused by Setpoint Drift.Switches Recalibr & Tested Successfully

Event date:
Report date:
3661980128R03 - NRC Website

text

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QL2_j l With the plant in steady state operation at 2410 felt, 2B21-f4023 C and D, l

Reactor liigh Pressure Instruments, were found to actuate.at 1065 psig.

[o ;31 l gl Tech Specs Section 2, Table 2.2.1-1 requires actuation at 1045 +15.36 l

I psig head correction. Redundant switches 2B21-N023A and B were within

- o s I tolerances. This is a repetitive event as last reported on Reportable l

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Occurrence 50-366/1980-122. Plant operation was not affected as a result l

of this event nor was public health and safety affected by this event.

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i _J LER #: 50-366/1980-128 Licensee: Georgia Power Company Facility flame: Edwin I. Hatch Docket #: 50-366 flarrative Report for LER 50-366/1980-128.

During steady state operation at 2410 int and performing HNP-2-3001, Reactor High Pressure Instrument Test, pressure switche 2021-fl023C and 2B21-fl023D were found to actuate at 1065 psig inc. The Tech Spec limit per Section 2, Table 2.2.1-1 is 1045 +15.36 psig head correction.

The cause of this event has been attributed to setpoint drift.

The switches, Darksdale flodel B2T-fil2SS, were immediately recalibrated per HflP-2-5279, Barksdale Pressure Switch Calibration, and functionally tested successfully per liflP-2-3001.

Plant operation was not affected as a result of this event.

This is a re-petitive occurrence as last reported on Reportable Occurrence Report fio. 50-366/

1980-122. A generic review revealed no inherent problems.

Redt.ndant switches 2021-i1023A and 2321-N023B were operable and within tolerance.

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There were no effects upon public health and safety due t'o this event. The unit is now in full compliance with the requirements.

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