ML20003H290

Interim Rept of Significant Const Deficiency 26 Re Main Feedwater Isolation Valves Temp Maint of Actuators.Heating Elements & Shrouds Will Be Provided for Actuators & Control Thermostats Provided for Heaters.Final Rept by 810930

ML20003H290
Person / Time
Site:	Waterford
Issue date:	04/30/1981
From:	Aswell D LOUISIANA POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, Q-3-A35.07.26, W3K81-0162, W3K81-162, NUDOCS 8105050492
Download: ML20003H290 (3)

Text

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I l.OUISIANA 442 osanaNes staea P O W E R & L i G H T[ p o. sox 60C8

• New ORLEANS. LOUISIANA 70174. (5041 386-2345 U SYS

o. L. ASWELL Ves preensers-power princton April 30, 1981 W3K81-0162 Q-3-A35.07.26

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[f . W Mr. K. V. Seyfrit, Director, Region IV

,yg6 Z :.D 4j;g p3 U. S. Nuclear Regulatory Commission Q ,' [ -

5 Office of Inspection and Enforcement "V A

. h 611 Ryan Plaza Drive, Suite 1000 ' /7 D.

Arlington, Texas 76012

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SUBJECT:

Waterford SES Unit No. 3 .D I.C3' Docket No. 50-382 Interim Report of Significant Construction Daficiency No. 26

" Main Feedwater Isolation Valves - Temperature Maintenance of Ac tua tors"

Dear Mr. Seyfrit:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Interim Report of Significant Construction Deficiency No. 26, " Main Feedwater Isolation Valves - Temperature Maintenance of Actuators."

If you have any questions, please advise.

27ery truly yours, 1

D. L. Aswell DLA/LL3/grf-cc: l V Director Off'-- of Inspection & Enforcement U. m 21 ear Regulatory Commission /f Washington, D. C. 20555 (with 15 copies of report) 3

2) Director f Office of Management //

Information and Program Control U. S. Nuclear Regulatory Cot:: mission Washington, D. C. 20555 (with I copy of report) b 8105050 D

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LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT NO. 3 1

Interim Report of .

Significant Construction Deficiency No. 26 4

" Main Feedwater Isolation Valves - Temperature Maintenance of Actuators" Reviewed by - -

2.3. [!

R. J. Milhis4.w GSite Manager ' Date Reviewed by J. L/ Wills - Project Superintendent Date Reviewed by - - .

J. Hart - Project Licensing Engineer Date Reviewed by a M d[M/

~ Date R.A.garenstt1 Q. A. p te supervisor 1 April 22, 1981 i

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e INTERLH REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 26

" MAIN FEEDWATER ISOLATION VALVES - TEMPERATURE MAINTENANCE OF ACTUATORS" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e) . It describes deficiencies in the Main Feedwater Isolation Valve Actuators relative to the closure of the Main Feedvater Isolation Valves within a specified time from receipt of the Main Steam Isolation Signal.

DESCRIPTION The Ebasco Assistant Chief Mechanical Nuclear Engineer was informed of this de-ficiency by Anchor Darling Valve Company via telex dated February 24, 1981, at which time it was indicated that the Feedwater Isolation Valves will not meet o the specification closing speed requirement in ambient temperatures below 65 F and aay not close at all in extremely cold temperatures. It was further identified that this poses a serious design deficiency that may jeopardize the safe opera-tion of the plant and must be corrected. The valves affected are 2FW-V8243 and .

2FW-V823A which are 20-inch motor-operated gate valves, Nuclear Safety Class 2.

SAFETY IMPLICATIONS The Waterford 3 Main Feedwater Isolation Valves are externally located and there-fore exposed to the ambient environment. The Main Steam Line 3reak analyses, as described in FSAR Sections 6.2.1.1.3 and 15.1.3 assume closure of the Main Feed-water Isolation Valves in a specified time from receipt of the Main Steam Isola-tion Signal. Failure of these valves to close due to cold ambient temperature in the specified time period could invalidate the results of these analyses.

CORRECTIVE ACTION Corrective action will entail providing heating elements and shrouds for the actua-tors taorder to maintain the temperature above 65 F. In addition, control ther=o-stats will be provided to turn the heater on and off and indicate when the temp-erature drops belew an acceptable limit. Corrective action will be accomplished and a final report submitted on or before September 30, 1981.

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