05000272/LER-1979-005, Supplemental LER 79-05L/03X-1:on 790104,during Normal Operation,Individual Rod Position Indication for Rod 2D5 Began Oscillating.Cause Could Not Be Identified.Connectors Checked & RPI Coil Stack Replaced

Supplemental LER 79-05L/03X-1:on 790104,during Normal Operation,Individual Rod Position Indication for Rod 2D5 Began Oscillating.Cause Could Not Be Identified.Connectors Checked & RPI Coil Stack Replaced

ML18081A852
Person / Time
Site:	Salem
Issue date:	01/02/1980
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A851	List: 05000272/LER-1979-005, Supplemental LER 79-05L/03X-1:on 790104,during Normal Operation,Individual Rod Position Indication for Rod 2D5 Began Oscillating.Cause Could Not Be Identified.Connectors Checked & RPI Coil Stack Replaced
References
LER-79-05L-03X, LER-79-5L-3X, NUDOCS 8001080420
Download: ML18081A852 (1)

LER-1979-005, Supplemental LER 79-05L/03X-1:on 790104,during Normal Operation,Individual Rod Position Indication for Rod 2D5 Began Oscillating.Cause Could Not Be Identified.Connectors Checked & RPI Coil Stack Replaced

Event date:
Report date:
2721979005R00 - NRC Website

text

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.ENSEE EVENT REPORT U.S. NUCLEAR REGULATURY COMMISSION CONTROLBLOCK: ~'~..._.-...~...__._~..__-tl(i) 1 6

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DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

[]JI] I During normal operation, individual rod position indication for rod 2D5 began lTIIJ [ill]

[ill]

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oscillating.

A flux map verified rod position within 12 steps of Bank D.

Troubleshooting of rod position circuitry confirmed that indication for rod 205 was inoperable.

The Action Statement for T/S 3.1.3.2.a was implemented.

The required flux mapping was initiated to be run every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

This is the-second

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The cause for this occurrence could not be identified.

All connectors were.

checked for cleanliness and tightness with no abnormalities found.

The RPI coil I stack for rod 205 was replaced, even though no apparent problems were detected.

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