ML20087L155

Interim Significant Const Deficiency Rept,Item 100 Re Terminations to Knox Fuse Blocks,Ge 4,160 Kv Switchgear.All Knox Fuse Block Terminations Reinspected.Next Rept Will Be Submitted by 840406.Also Reported Per Part 21

ML20087L155
Person / Time
Site:	Waterford
Issue date:	03/12/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-84 100, W3K84-0532, W3K84-532, NUDOCS 8403270059
Download: ML20087L155 (3)

Text

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I OUISIANA 24a ouinosoe SrnEc1 POWER & LIGHT P O BOX 6008 . NEW ORLEANS. LOUISIANA 70174 . (5041 366-2345 UTEi?$ ESSE March 12, 1984

$bbb 5.07.100 I

hl MAR I 91984 Hr. John T. Collins l Regional Administrator, Region 3 U. S. Nuclear Regulatory Co:mnis"4 =

611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

REFERENCE:

LP&L Letter W3K84-0242 dated February 3, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 100

" Terminations to Knox Fuse Blocks, G.E. 4160KV Switchgear" First Interim Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Interim Report for Significant Construction Deficiency No.

100, " Terminations to Knox Fuse Blocks, G.E. 4160KV Switchgear".

This item was previously reported as PRD No. 141 and evaluated as not reportable by the referenced letter. However, on January 26, 1984, General Electric reported the subject as a Part 21. This item is now Significant Construction Deficiency No. 100.

Very truly yours,

\7 T. F. Gerrets Corporate Quality Assurance Manager TFG:CNH:SSTC cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies)

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.9-Mr.~ John T. Collins March.12, 1984 W3K84-0532 Page 2 cc: Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. E. L. Blake Shaw, Pittman, Potts & Trowbr'idge 1800 M Street, N.W.

Washington, D.C. 20036 i Mr. W. M. Stevenson

~ Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130 Records. Center

. Institute of Nuclear Power Operations

.1100 Circle 75 Parkway, Suite 1500

. Atlanta, Georgia 30339

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INTERIM REPORT OF SIGNIFICANT CONSTRUCTION DEVICIENCY NO.100 1" TERMINATIONS TO KNOX FUSE BLOCKS, G.E. 4160KV SWITCHGEAR"

-INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes electrical terminations made to Knox 600V, 60 AMP fuse blocks (Cat. No. 525696) mounted in Genera 1' Electric (GE) metalciad 4.16KV safety switchgear.

This item has been reported to the USNRC pursuant to 10CFR21, by GE of

~Burlington, Iowa.

E DESCRIPTION

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Because of circuit requirements, Knox fuse blocks (as described above) were

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used by GE. The terminal lug of these fuse blocks was designed for solid wire, however, stranded wire was specified with ring tongue type terminations.

GE's use'and modifications of the ring tongue, spade tongue and tab type lugs allowed terminating standard #8AWG and #14AWG control cable into the Knox fuse block clamp type connectors.- This type of connection was thought to be deficient.

SAFETY IMPLICATIONS A total loss of connection to the fuse could render the 4.16 KV breakers

. inoperable and unable'to perform its intended safety function.  !

CORRECTIVE ACTION TAKEN' Contact with GE and preliminary visual inspection concluded .that terminations appeared to be functional and that the as-installed terminations were electrically suitableoto carry the circuit' currents and qualified to withstand a seismic event. Based upon the above and in light of no related field failures, no corrective action was deemed necessary by CE. However, LP&L will inspect _all Knox fuse block'terminacions per GE's recommendation and i relocate /retighten any single #14AWG connections that are in the fuse lower clamp -connector area to the more' desirable upper clamp area.

'An. Update / Final Report will be submitted on April 6, 1984.

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