ML20137X505

Interim Deficiency Rept (CDR 85-00-18) Re Possible Malfunction of Figure 3050 Diaphragm Valves by Dresser Industries.Initially Reported on 851023.Rept Will Be Submitted After Mods to Disc Guide Completed

ML20137X505
Person / Time
Site:	Seabrook
Issue date:	11/26/1985
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CDR-85--18), (CDR-85-00-18), SBN-901, NUDOCS 8512100536
Download: ML20137X505 (3)

Text

______ _ __ - _ ____ __ __

. p' SEABROOK STATION

- Engineering Offica gggg November 26, 1985 New Hampshire Yankee Division United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programs

Reference:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) Telecon of October 23, 1985, D. E. Groves (YAEC)/

P. H. Hannes (YAEC) to Clifford Anderson (Region I Duty Officer)

Subject:

Interim 10CFR50.55(e): Possible Malfunction of Figure 3050 Diaphram Valves Supplied by Dresser Industries (CDR 85-00-18)

Dear Sir:

On October 23, 1985, we reported a potential 10CFR50.55(e) deficiency, Reference (b), regarding Figure 3050 Diaphram Valves supplied by Dresser Industries. We have completed our evaluation and have determined that the deficiency is reportable.

Description of Deficiency Dresser Industries reported a possible malfunction in their Figure 3050 Diaphram Valves. The valve disc cap is capable of cocking in the disc guide and wedging, thereby not allowing the disc to move. In this instance, the upper stem may be raised with the disc remaining in a closed or part partially closed position.

Safety Implication The safety related systems these valves are installed in are the Combustible Gas Control and Nitrogen Gas Systems.

In the Combustible Gas Control System, this valve is used in the con-tainment hydrogen analyzer lines. There are two independent and redundant hydrogen analyzer systems located outside the containment to continuously monitor the containment hydrogen concentration following a design basis loss of coolant accident. Failure of the valve (s) to open would render the hydrogen analyzers inoperative and prevent containment hydrogen sampling capabililty.

8512100536 851126 )#

PDR ADOCK 05000443 S PDR Seabrook Station Construction Field Office P.O. Box 700

• Seabrook, NH 03874

.e.. ,. ' ' P:ga 2 Attsnticns, Mr. Richard Starostacki  ;

The Nitrogen Gas System valves are normally closed and are not required to operate during or _ following an accident.

Corrective Action We intend to implement the modifications to the disc guide as recommended by Dresser and will inform Region I when these modifications are complete.

Very truly yours, L dA John DeVincentis, Director Engineering and Licensing ec: Atomic Safety and Licensing Board Service List Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555

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William S.' Jordan, III Donald E. Chick-Diane Curran Town Manager Ha rmon, Weiss & Jordan Town of Exeter 20001.S. Street, N.W. 10 Front Street Suite 430- Exeter.,NH 03833 Washington, D.C. 20009 Brentwood Board of Selectmen Robert G. Perlis RED Dalton Road

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, City Hall Robert A. - Backus, Esquire Newburyport, MA 01950

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Tom Burack)

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