ML20087F892
| ML20087F892 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 03/02/1984 |
| From: | Gerrets T LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 83, W3K84-0469, W3K84-469, NUDOCS 8403190262 | |
| Download: ML20087F892 (3) | |
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LOUISIANA P O W E R & L I G H T! R o BOX 6008
- NEW ORLEANS, LoulSIANA 70174 242 ouanoNos sineer
. (504) 366-2345 UTIUTIES SYSTEM March 2, 1984 W3K84 0469 3 @ 3 0 7 0' ^^i'07'83
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Mr. John T. Collins MAR - 9124 Regional Administrator, Region IV y
U. S. Nuclear Regulatory Commission 611 T.yan Plaza Drive, Suite 1000 Arlfagton, Texas 76012
REFERENCE:
LP&L Letter W3K84-0052 dated January 9, 1984
Dear Mr. Collins:
SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 83
" Heat Tracing Design Deficiencies Identified During Hot Functional Testing" Final Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 83,
" Heat Tracing Design Deficiencies Identified During Hot Functional Testing."
If you have any questions, please advise.
Very truly yours, Ara b T. F. Cerrets Corporate Quality Assurance Manager TFG:CNH:VER Attachment cc: -Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 (15 copies)
PDP ADOCK8403190262 840302 05000382
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.Mr.' John T.-Collins March 2, 1984 W3K84-0469 Page 2-cc: Director-
. 0ffice of Management
'" Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C.-
20555 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 L:
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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 83
" HEAT TRACING DESIGN DEFICIENCIES IDENTIFIED DURING HOT FUNCTIONAL TESTING" INTRODUCTION This. report is submitted pursuant to 10CFR50.55(e). The report describes
" electrical noise" deficiencies with the safety related heat trace "A" and "B" panels. This problem is considered reportable pursuant to the requirements of 10CFR50.55(e). To the best of our knowledge this problem has not been reported to the USNRC pursuant to 10CFR21.
DESCRIPTION During prerequisite testing of the boric acid system heat tracing, electrical noise on-temperature sensing thermocouple extension cables was found to cause premature operation of over-temperature cutouts and alarms. These circuits are utilized to control the temperature of the boric acid system and prevent precipitation during normal operation.
SAFETY IMPLICATION Failure or misoperation of the boric acid heat tracing circuits, if left uncorrected, could cause precipitation of boric acid and prevent proper operation of the boron injection system thereby impairing safe shutdown.
CORRECTIVE ACTION
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NCR-W3-6134 has been initiated to track and document this deficiency.
Evaluation by Chemelex has determined that " electrical noise" will be suppressed by adding capacitors and revising the termination scheme. The capacitors were added to the high temperature cutout modules to prevent spurious or false tripping of this device. The termination scheme was revised to attach the shield wire directly'to the thermocouple head in lieu of the negative thermocouple lead. This new termination scheme allows the common mode noise rejection circuitry to function as designed. Implementation of Chemelex's corrective action has been completed under NCR-W3-6134.
Corrective action and supporting documentation has been reviewed and the NCR has been closed.
This report is submitted as the final report.