ML20090M581

First Interim Significant Const Deficiency Rept 109 Re Inadequate Design of Qs Pdr/Pps Circuit Interface.Pac Panels CP27 & CP28 Will Be Modified to Add Westinghouse NLP-3 Pac Cords

ML20090M581
Person / Time
Site:	Waterford
Issue date:	05/11/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
109, W3K84-1140, NUDOCS 8405290079
Download: ML20090M581 (3)

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l' LOUISIANA 142 DRAHONDE STHW

,,, ,,,,, P O W E R & L I G H T! P O Box 0000

• NEW ORM ANS. LOUISLANA 70174 . (S UiluTIES SYSTEM May 11, 1984 W3K84-1140 Q-3-A35.07.109 Mr. John T. Collins

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Regional Administrator, Region IV .

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611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 UW -

REFERENCE:

Telecon C. Itooper (LP&L) and W. Sidele (NRC Region IV) on April 11, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 109

" Inadequate Design of QSPDS/PPS Circuit Interface" First Interim Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copics of the Interim Report of Significant Construction Deficiency No.

109, " Inadequate Design of QSPDS/PPS Circuit Interface". This item was previously reported as PRD No. 164.

If you have any questions, please advise.

Very truly yours, D L 6 tad T. F. Correts Corporate Quality Assurance Manager TFG CNil:SSTG cc: Director Office of Inspection & Enforcement U. S. Nuclear

• Regulatory Commission Washington, D.C. 20555 (15 copies)

Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 8405290079 840511 PDR ADOCK 05000302 16 'A7\\

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Mr. John T. Collina.

May 11, 1984

- W3K84- 1140 Page 2 cc: Mr. E. L. Blake.

Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036

..,Mr. W. M. Stevenson Monroe & Lemann "1424 Whitney Building New Orleans, Louisiana 70130 Mr. W. A. Cross 7910 Woodmont't. venue Suite 1200 3cthesda, Maryland 20814

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Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 c

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, m; INTERIM REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 109

" INADEQUATE DESIGN OF QSPDS/PPS CIRCUIT INTERFACE" INTRODUCTION This report is submitted pursuant: to 10CFR50.55(e). It describes the electrical grounds on. signal common for channels "C" and "D" of PPS.

To the best of our knowledge, this deficiency has not been reported to the USNRC. pursuant-to 10CFR21.

DESCRIPTION With the present design, low pressurizer pressure signals.for channels "C" and "D" inputs to QSPDS system are connected from non-isolated outputs of the process analog control cabinet (PAC) CP27 and CP28, respectively. This connection has introduced ~an electrical ground on signal commons in channels "C" and "D" of the PPS.

SAFETY IMPLICATIONS If the above ground problem was lef t uncorrected, following am actual low-pressurizer pressure ~ event, channels "C" and "D" fail high and could not initiate a PPS trip.

CORRECTIVE ACTION TAKEN PAC Panels CP27 and CP28 will be modified to add Westinghouse NLP-3 PAC cards and provide associated wiring to facilitate an isolated output signal to QSPDS. DCN-1C-1935 and DCN-1C-1520, Rev. 3 were issued to cover these' changes.

An update or Final Report will be submitted to the USNRC -on or before May. 25, 1984.

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