ML20090M581
| 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) | |
Text
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l' LOUISIANA
,,,,,,,, P O W E R & L I G H T! P O Box 0000
- NEW ORM ANS. LOUISLANA 70174. (S 142 DRAHONDE STHW UiluTIES SYSTEM May 11, 1984 W3K84-1140 Q-3-A35.07.109
[fb Mr. John T. Collins l
Regional Administrator, Region IV
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? I $dd U.S.NuclearRegulatoryCommission{h\\
611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 U W
REFERENCE:
Telecon C. Itooper (LP&L) and W. Sidele (NRC Region IV) on April 11, 1984
Dear Mr. Collins:
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 16 'A7\\\\
8405290079 840511 PDR ADOCK 05000302 0
PDit
j-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 Records Center
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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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