ML20066E427

Interim Deficiency Rept Scd 37 Re corrosion-generated Error in RCS T-cold Signal.Initially Reported on 820401.Final Rept Will Be Delayed Until 830527 Due to Impact of NUREG-0660 & Reg Guide 1.97 on Corrective Action

ML20066E427
Person / Time
Site:	Waterford
Issue date:	11/05/1982
From:	Maurin L LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, SCD-37, W3I82-0094, W3I82-94, NUDOCS 8211150169
Download: ML20066E427 (2)

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• NEW ORLEANS. LOUISIANA 70174 * (504) 366-2345 NONdysNU L V. MAURIN Vice President November 5, 1982 Nuclear Operations W3182-0094 Q-3-A35.07.37 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission -f

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SUBJECT:

Waterford SES Unit No. 3 . ,g Docket No. 50-382  %

Significant Construction Deficiency Report No. 37  %

" Temperature Detectors (RTD's) Failure" Fifth Interim Report

REFERENCES:

1) LP&L letter W3K82-0193 dated April 1, 1982

2) LP&L letter W3K82-0282 dated August 5, 1982

Dear Mr. Collins:

The original SCD #37 involved a corrosion-generated error in the RCS T-cold signal. The C-E recommended corrective action involved silver-soldering the RTD leads at the terminal strip. Ebasco Design Engineers studied the problem along with the engineers preparing responses to NUREG 0660 "NRC Action Plan Developed As A Result of the TMI-2 Accident" and USNRC Regulatory Guide 1.97

" Instrumentation for Light Water Cooled Nuclear Power Plants to Assess Plant and Environ-Conditions During and Following An Accident." The latter document (1) required a restudy of the original design as to require dual RTD sensors to fit the original C-E built signal RTD sensor thermowelds, (2) required an industry review to find and QA-qualify a vendor of dual RTD sensors. (3) rey-uired purchasing of dual RTD sensors. At the present time, there is a promised delivery date in April, 1983 on the dual RTD sensors.

As a result of the impact of NUREG-0660 and Regulatory Guide 1.97 on the corrective action, submittal of a final report will be delayed until May 27, 1983.

Very truly yours, NH4 cat L. V. Maurin LVM/ MAL:keh /f lEh*iB8!?agssgg, PDR Y

d Mr. John T. Collins W3I82-0094 Page 2 cc: 1) Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

2) Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555

3) E. Blake

4) W. Stevenson

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