ML20083J695

Final Rept of Significant Const Deficiency 77 Re Inadequate Containment Purge Valve Closure Time & Flow Rates.Initially Reported on 831013.Second Solenoid Valve Added to Each Containment Purge & Vent Valve

ML20083J695
Person / Time
Site:	Waterford
Issue date:	12/21/1983
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, 77, W3K83-1977, NUDOCS 8401100266
Download: ML20083J695 (3)

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I OUISIANA 242 ouanaNoE srnn1 POWE R & L1G HT P O BOX 6008

• NEW OnLEANS LOUISTANA 70174 * (504) 366 2345 *

[$?00SsTIO December 21, 1983 W3K83-1977 Q-3-A35.07.77 Mr. John T. Collins .i Regional Administrator, Region IV ' i j-_.911 3 l ;' \ ' , dl t 3) j U. S. Nuclear Regulatory Commission .h

't I 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

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REFERENCE:

LP&L Letter U3K83-1553 dated October 13, 1983

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 77

" Inadequate Containment Purge Valves Closure Time and Flow Rates" Final Report In accordance with the requirements of 10 CFR 50.55(e), we are hereby providing twe copies of the Final Report of Significant Construction Deficiency No. 77, " Inadequate Containment Purge Valves Closure Time and Flow Rates".

If you have any questions, please advise.

Very truly yours, T. F. Gerrets Quality Assurance Manager TFG:CNH:SSTG Attachment cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) 8401100266 831221 .

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Mr. John T. Collins December 21, 1983 W3K83-1977 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 l

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. . ,o FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 77

" INADEQUATE CONTAINMENT PURGE VALVES CLOSURE TIME AND FLOW RATE" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a problem with the closure time of the Containment Purge and Vent Valves encountered during the prerequisite phase of testing. The Containment Purge and Vent Valves exceeded the maximum closure time required by design. This problem is considered reportable under the requirements of 10CFR50.55(e).

The first interim report also described the failure of the valves to meet the design flow rate. It has since been determined that this condition does not represent a safety concern and it has therefore been deleted from this response.

To the best of our knowledge this problem has not been reported pursuant to 10CFR21.

DESCRIPTION During prerequisite testing of the 48 inch Containment Purge and Vent Valves (Tag Numbers 2HV-B150 through 2HV-B155), it was noted that the valve closure time had varied between 11 and 18 seconds. This exceeds the design closure time of 5 seconds maximum. This deviation is attributed to the installation of one (1) solenoid valve instead of two (2) as originally required per the vendor's design.

SAFETY IMPLICATIONS The post accident offsite radiological dose calculations and the 10CFR50, Appendix K ECCS analysis were based on the Containment Purge Valves closing within their design closure time. Failure to do so could therefore invalidate l these results and require reanalysis.

CORRFCTIVE ACTION TAKEN l

Nonconformance Report W3-5923 and W3-6059 were initiated to track and document corrective action, and the following corrective action has been performed:

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1) A second solenoid valve was added to each containment purge and vent valve.

l l 2) The air connections to the solenoid valves were enlarged.

l With the above modifications, a valve closure time of lees than or equal to 5 l seconds was achieved on each of the subject valves.

This report is submitted as the Final Report.

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