ML20215M718

Interim Deficiency Rept (CDR 86-00-04) Re Improper Cable Lug Connections in 25 Kva Inverter.Initially Reported on 860401. Cable Lugs for Dc & Ac Power Supply Connections Will Be Determinated & Properly Reterminated

ML20215M718
Person / Time
Site:	Seabrook
Issue date:	05/09/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CDR-86--4), (CDR-86-00-04), SBN-1041, NUDOCS 8611030194
Download: ML20215M718 (3)

Text

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May 9, 1986 SBN- 1041 Pubuc Service of New Hampshire T.F. Q2.2.2 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programs

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket

No's.J50-4431'and 50-444 (b) Telecon of April 8, 1986, D. R. Jaquette (YAEC) to J. Schumacher (NRC Region I)

Subj ect : Interim 10CFR50.55(e) Report: Improper Cable Lug Connections in 25 KVA Inverter (CDR 86-00-04)

Dear Sir:

On April 1,1986, we reported a 10CFR50.55(e) deficiency, Reference (b),

regarding potential malfunction of a 25 KVA inverter manufactured by Elgar Corporation due to improper stacking of cable lugs. This deficiency has been evaluated and determined to be reportable under the provisions of 10CFR50.55(e).

Description of Deficiency l

The deficiency is associated with the improper stacking of cable lugs on l the back of the battery input breaker assembly. The electrical connection to the 600A fuse block is incorrectly made via nuts and studs instead of direct connection of the cable lug to the bus which connects to the fuse block. We also found that cable lugs are stacked similarly for AC input power supply connection. Two safety-related inverters are identified as having the improper connections.

Safety Implications The potential ef fect would be abnormal heating at the connections due to high resistance. This could lead to a fault or circuit failure that would render the equipment inoperable.

8611030194 860509 PDR ADOCK 05000443 S PDR

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T L.f ! Fi I' s Seabrook Station Construction Field Office . P.O. Box 700 Seabrook. NH O3874 -

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J-United States Nuclear Regulatory Commission

' Attention: Mr. Richard W. Starostecki Page 2 Corrective Action The cable lugs for DC and AC power supply connections in the af fected 25 KVA inverters will be determinated and properly reterminated in a manner to preclude abnormal heating due to high resistance.

We will inform Region I when the corrective action has been completed.

This letter is being filed pursuant to the interim reporting provisions of 10CFR50.55(e).

Very truly yours, A

John DeVincentis Director of Engineering cc: Atomic Safety and Licensing Board Service List

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