ML20083E688

Interim Significant Deficiency Rept 94 Re Inability of Chemical Vol Control Sys Heat Tracing Controllers to Hold Calibr.Raychem Provided Mod to Prevent Drift.Final Rept to Be Submitted by 840301

ML20083E688
Person / Time
Site:	Waterford
Issue date:	12/16/1983
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, 94, W3K83-1975, NUDOCS 8312290350
Download: ML20083E688 (3)

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$00$Us4IU LOUISIANA 242 mAnoNoe swa P O W E R & L 1 G H T! p o sox 6008 . NEW ORLEANS. LoutSIANA 70174 * (504) 366-2345 December 16, 1983 W3K83-1975 Q-3-A35.07.94 l

Mr. John T. Collins Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 t

REFERENCE:

Telecon between C. N. Hooper (LP&L) and R. Stewart (NRC IV) of l November 18, 1983 l

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 94

" Chemical Volume Control System (CVCS)

Heat Trace Temperature Drift" 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.

j 94, " Chemical Volume Control System (CVCS) Heat Trace Temperature Drift".

This item was previously identified as PRD No. 131.

Very truly yours,

\Y A8 T. F. Gerrets Quality Assurance Manager TFC:CNH:VBR Attachments cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) 8312290350 831216 PDR ADOCK 05000382 S PDR N

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Mr. John T. Collins-December 16, 1983 W3KS3-1975 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, & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036 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

INTERIM REPORT FOR SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 94

" CHEMICAL VOLUME CONTROL SYSTEM (CVCS) HEAT TRACE TEMPERATURE DRIFT" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a deficiency with the safety related heat tracing controllers.

This problem is considered reportable under the requirements of 10CFR50.55(e).

To the best of our knowledge, this problem has not been identified to the Nuclear Regulatory Commission pursuant to 10CFR21.

DESCRIPTION The safety related heat tracing controllers were exhibiting the inability to remain in calibration over a period of time. This is a result of the controllers sensitivity to changing ambient conditions.

SAFETY IMPLICATIONS The safety related heat tracing controllers' failure to hold its' calibration could result in deviations from the Technical Specification requirements to maintain minimum boration line temperatures, if left uncorrected.

CORRECTIVE ACTIONS CIWA No. 83DS92 was initiated to track and document this deficiency.

The vendor (Raychem) has provided a modification to prevent the safety related controllers from " drifting" out of calibration. In light of the above facts, it is necessary to thermally connect the terminal block to the sensor. This will be accomplished by turning the Temperature Control Module (TCM) sensor to the opposing circuit board face. (The High Temperature Module (HTM) are already installed in this manner.) Also, required is installation of a heat sink to the terminal block and insulation about the sensor. The heat sink will allow changes in ambient to be transmitted to the terminal block. This will ensure the sensor reading terminal block temperature. The insulation will provide a stable environment for the sensor and guard against sensing rapid ambient temperature changes. This work will be performed by LP&L under andor supervision using vendor provided parts. The vendor is also issuing a

. w drawing showing this modification.

An update or final report will be submitted to the USNRC on er before March 1, 1984.

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