05000325/LER-1980-041, Updated LER 80-041/01T-1:on 800525,during Review of Environ Qualification of Electrical Equipment,Nylon Insulating Sleeve Portions of compression-type Terminator Lugs Did Not Pass Qualification Test.Caused by Sleeve Deteriorati

Updated LER 80-041/01T-1:on 800525,during Review of Environ Qualification of Electrical Equipment,Nylon Insulating Sleeve Portions of compression-type Terminator Lugs Did Not Pass Qualification Test.Caused by Sleeve Deterioration

ML19318C516
Person / Time
Site:	Brunswick
Issue date:	06/20/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318C512	List: 05000325/LER-1980-041, Updated LER 80-041/01T-1:on 800525,during Review of Environ Qualification of Electrical Equipment,Nylon Insulating Sleeve Portions of compression-type Terminator Lugs Did Not Pass Qualification Test.Caused by Sleeve Deteriorati
References
LER-80-041-01T, LER-80-41-1T, NUDOCS 8007010564
Download: ML19318C516 (2)

LER-1980-041, Updated LER 80-041/01T-1:on 800525,during Review of Environ Qualification of Electrical Equipment,Nylon Insulating Sleeve Portions of compression-type Terminator Lugs Did Not Pass Qualification Test.Caused by Sleeve Deterioration

Event date:
Report date:
3251980041R00 - NRC Website

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8 60 61 DOCKET NUM8ER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h 0 2 lDuring the review of environmental cualification of electrical eauipment for Unit Nos. I l o l 31 l 1 and 2 as required by IE Bulletin 7"-01, it was found that certain nylon insulating i

l sleeve portions of the compression-type termination lugs, manufactured by AMP Special l o 4 l Industries, did not pass the environmental qualification test.

The lug in question is t o s 10 Is l l AMP Type PIDG for use with sizes 10 through 12 wiring.

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LER ATTACHMENT - RO# 1-79-41 Facility: BSEP Unit'No. 1 Event Date: May 25, 1979' An evaluation has been made of the possible' problems which could result from the failure of the. insulating sleeve.

It was assumed that a total deterioration of the sleeve had taken place. 'Therefore, the termination lugs were considered to be completely uninsulated,'

which defines the worst condition.

Even in an uninsulated condition, problems can only occur if the lugs were free to rotate underneath the terminal screws far enough to cause contact,between adjacen; lugs.

Rotation is not expected in the seismically qualified terminations used at Brunswick.

i As an interim measure, each of the terminations found using the AMP.

sleeve will be inspected to ensure that-the wire is properly aligned to the terminal block and that'the termination screw is tight.

These.

. actions provide ampurance for the nearteen that plant operation may continue without undue risk to the public health and safety.

4 At the next outage of sufficient length following the discovery for each unit, we will implement.a permanent solution to the problem.

There are several possible permanent insulation devices, one oc a combination of which, will be used to effect a permanent, fully qual-4 ified solution.

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