05000339/LER-1980-080-03, /03L-0:on 801025,temp Indicator TI-2412B Associated W/Loop a Failed Low.Caused by Leads from Recorder Connected Upstream of Isolation Amplifier.Procedure Changed to Connect Recorder Leads to Isolated Points of Circuit

/03L-0:on 801025,temp Indicator TI-2412B Associated W/Loop a Failed Low.Caused by Leads from Recorder Connected Upstream of Isolation Amplifier.Procedure Changed to Connect Recorder Leads to Isolated Points of Circuit

ML19343A961
Person / Time
Site:	North Anna
Issue date:	11/19/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343A958	List: 05000339/LER-1980-080, Forwards LER 80-080/03L-0 05000339/LER-1980-080-03, /03L-0:on 801025,temp Indicator TI-2412B Associated W/Loop a Failed Low.Caused by Leads from Recorder Connected Upstream of Isolation Amplifier.Procedure Changed to Connect Recorder Leads to Isolated Points of Circuit
References
LER-80-080-03L-01, LER-80-80-3L-1, NUDOCS 8011240352
Download: ML19343A961 (2)

LER-1980-080, /03L-0:on 801025,temp Indicator TI-2412B Associated W/Loop a Failed Low.Caused by Leads from Recorder Connected Upstream of Isolation Amplifier.Procedure Changed to Connect Recorder Leads to Isolated Points of Circuit

Event date:
Report date:
3391980080R03 - NRC Website

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UR DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On October 25, 1980 while operating in Mode 1 at 100% power, the temperature

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indicator (TI-2412B) associated w.th the overpower AT setpoint for Loop A

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failed low.

Since the affected channel was placed in the trip condition within/

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one hour, as required by T.S. 3.3.1.1, the health and safety of the public

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were not affected. The event is reportable pursuant to T.S. 6.9.1.9.c.

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SYSTEM

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The temperature indicator failed low when leads from a recorder were connected /

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upstream of an isolation amplifier. The recorder was usc 1 to monitor the

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overpower AT setpoint during a load swing test.

The corrective action was to /

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change the procedure so as to connect the recorder leads to isolated points of /

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of the appropriate circuit.

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FACILITY METHOD OF STATUS

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NRC USE ONLY

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NAML OF PREPARER W. R. CARTWRIGHT PHONE (703) E94-5151

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. Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of I Docket'No. 50-339 Report No. LER 80-080/03L-0

Description of Event

On October 25, 1980 while operating in Mode I at-100% power, the temperature indicator (TI-2412B) associated with the overpower AT setpoint for Loop A failed low.

The applicable Technical Specification is 3.3.1.1,

- and the event is reportable pursuant to T.S. 6.9.1.9.c.

Probable Consequences of Occurrence Since the affected channel was placed in the trip condition within one hour, as required by T.S. 3.3.1.1, the health and safety of the public were not affected.

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Cause of Event

The temperature setpoint failed low when leads from a recorder were connected to unisolated points of the circuit. The corrective action was to change the procedure of the load swing test so that the recorder i

leads are connected to isolated points of the circuit.

Immediate Corrective Action

The immediate action was to place the overpower AT channel in the trip condition. The channel was checked to verify it was not affected by the recorder leads.

Scheduled Corrective Action

~There are no scheduled corrective actions.

Actions Taken to Prevent Recurrence A change was made in the procedure of the load swing test such that leads from the. recorder are connected ~at isolated points of the appropriate circuits.

Generic Implications 4

There are no generic implications.

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