ML20091M486
| ML20091M486 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/31/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 413-414-83-11, NUDOCS 8406110318 | |
| Download: ML20091M486 (2) | |
Text
.
DUKE POWER GOMPANY P.O. BOX 33180 CHARLOTTE. N.C. 28242
!!AL D. TUCKr.H rer.ernoxe g jg 5 Pl?
- iSy 31,1984 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414
Dear Mr. O'Reilly:
Significant Deficiency Report No. 413-414/83-11, transmitted on September 27, 1983, stated that a resolution to correct the deficiency would be reached prior to fuel load for Unit 1.
That resolution is described in the corrective action section of the attached Revised Significant Deficiency Report No.
413-414/83-11.
Very truly yours,
///ftf Hal B. Tucker LTP/php Attachment cc: Director INP0 Records Center Office of Inspection & Enforcement Suite 1500 U. S. Nuclear Regulatory Commission 1100 Circle 75 Parkway Washirs ton, D. C. 20555 Atlanta, Georgia 30339 NRC Resident Inspector Mr. Robert Guild, Esq.
Catawba Nuclear Station Attorney-at-Law P. O. Box 12097 Palmetto Alliance Charleston, South Carolina 29412 21351 Devine Street Columbia, South Carolina 29205
% dlNbD 8406110310 840531 PDR ADOCK 05000 g
gg S
/
f Il 4
".~
CATAWBA NUCLEAR STATION REVISED REPORT REPORT NUMBER:
SD 413-414/83-11 REPORT DATE:
May 31, 1984 FACILTIY:
Catawba Nuclear Station Units 1 and 2 f
IDENTIFICATION OF DEFICIENCY:
The Westinghouse NSSS Process Instrumentation and Control System NTC (Temperature Channel Test) cards utilize a mercury relay on the card which has experienced contact bounce during seismic testing.
The deficiency was identified by I. E. Notice 83-38 dated June 13, 1983.
INITIAL REPORT:
On August 29, 1983 Virgil Brownlee of the NRC was notified of the deficiency by L. Coggins, J. Thomas, J. Smith, and C. Rolfe of Duke Power Company.
COMPONENT AND/0R SUPPLIER:
The NTC printed circuit cards were supplied by Westinghouse's Industry Electronics Division.
DESCRIPTION OF DEFICIENCY:
The NTC Temperature Channel test cards utilize a mercury relay on the card that may experience contact bounce during a seismic event. This intermittant contact bounce will result in signal saturation of the down stream NRA (RTD Amplifier) card in the T hot and T cold circuits of the 7300 Process Protection System.
The saturation of the NRA card in plants utilizing non-filtered signals (which is applicable to Catawba) could delay initiation of over temperature-delta T and overpower-delta T trips.
ANALYSIS OF SAFETY DUPLICATIONS:
A possible delay could occur in the initiation of over temperature-delta T and overpower-delta T trips if required during a seismic event.
Such a delay could affect the safety of the plant.
CORRECTIVE ACTION:
There are sixteen (16) cards in each unit that have-the deficient relay installed. The contacts on each deficient relay are being jumpered per NCI 16997 and Nuclear Production NSM CN-1-0072.
This is a permanent fix and resolves this deficiency.
.