05000272/LER-1979-037-03, /03L on 790416:source Range Nuclear Instrumentation Channel N-32 Indication Became Erratic. Caused by Disconnected Shield on Source Range High Voltage Drawer Connector.Drawer Connection Reworked

/03L on 790416:source Range Nuclear Instrumentation Channel N-32 Indication Became Erratic. Caused by Disconnected Shield on Source Range High Voltage Drawer Connector.Drawer Connection Reworked

ML18079A300
Person / Time
Site:	Salem
Issue date:	05/11/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18079A299	List: 05000272/LER-1979-037, Forwards LER 79-037/03L-0 05000272/LER-1979-037-03, /03L on 790416:source Range Nuclear Instrumentation Channel N-32 Indication Became Erratic. Caused by Disconnected Shield on Source Range High Voltage Drawer Connector.Drawer Connection Reworked
References
LER-79-037-03L, LER-79-37-3L, NUDOCS 7905150464
Download: ML18079A300 (3)

LER-1979-037, /03L on 790416:source Range Nuclear Instrumentation Channel N-32 Indication Became Erratic. Caused by Disconnected Shield on Source Range High Voltage Drawer Connector.Drawer Connection Reworked

Event date:
Report date:
2721979037R03 - NRC Website

text

. Report Number:

Report Date:

Occurrence Date:

Facility:

e 79-37/03L 5/11/79 4/16/79 Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Source Range Nuclear. Instrumentation Channel N~'32 Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 6 Reactor Vessel Head Bolts Removed Reactor Vessel Head In Place DESCRIPTION OF OCCURRENCE:

While in Mode 6, prior to reactor vessel head removal, source range nuclear instrumentation channel N-32 indication started becoming erratic.

The channel was declared inoperable and the Action Statement for Techni-cal Specification 3.9.2 was implemented.

The erratic indication became an intermittent problem while Performance Department personnel were troubleshooting the channel components and the channel was returned to service and removed from service on 4-16, 4-17, 4-19 and 4-21-79.

At 1421 hours0.0164 days <br />0.395 hours <br />0.00235 weeks <br />5.406905e-4 months <br /> on 4-21-79, the channel was repaired and tested satisfactorily.

The Action Statement for T/S 3.9.2 was terminated at this time.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Two coaxial cable shield connections were the cause of this occurrence.

A connector on the high voltage cable of the source range drawer was found on 4/16/79 to have a broken shield connection.

This seemed to cure the problem but when intermittent erratic operation again occurred, further troubleshooting was done.

After replacement of. the detector and pre-amp assemblies on 4-21-79, a connector on the signal cable at the outboard*containrnent electrical penetration was found to have a broken solder connection on the shield sleeve, resulting in*an intermittent open circ~it.

ANALYSIS OF OCCURRENCE:

Technical*Specification 3.9.2 requires that if two source range neutron flux monitors, each with continuous visual indication in the Control Room and one with.audible indication in the containment and Control Room, are not in operation, immediately suspend all operations involving core

~lte~iticins or positive reactivity changes.

The reactor vessel head was in place throughout this occurrence.

Source range channel N-31 operated properly to provide shutdown neutron flux monitoring.

The reactor plant parameters were stable and remained stable to minimize reactivity changes.

79 05 150 S<6'y

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LER 79-37/03L CORRECTIVE ACTION:

The coaxial connector on the channel drawer was cleaned and reworked to provide a good shield connection.

The connector at the containment penetration was replaced with a spare connector.

FAILURE DATA°:

Not.Applicable Prepared By A. W. Kapple Manager Station SORC Meeting No.

34-79

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[§))]I While *in Mode 6, prior to.reactor vessel head removal, source range N.I. Channel

@II] I N-32 indication became erratic.

T/S 3.9.2 Action Statement was implemented.

After [Q:W ). initial repair, intermittent erratic operation required N-32 removal from service on I 4-16, 4-17, 4-:-19 and 4-21-79.

The channel was repaired and tested satisfactory on 4-21-79 and the Action Statement was terminated.

Source range N.I. Channel N-31 was I

((ill I operational and plant parameters were stable throughout this occurrence.

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