ML20129G348

Final Significant Const Deficiency Rept Re Corrosion Damage to Tapered Pins Securing Valve Stem to Butterfly Valves Supplied by BIF Industries.Initially Reported on 840831. Item Not Reportable Per 10CFR50.55(e)

ML20129G348
Person / Time
Site:	Hope Creek
Issue date:	05/20/1985
From:	Martin T Public Service Enterprise Group
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8506070231
Download: ML20129G348 (3)

Text

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e *n* Public Service Electric and Gas Cornpany Thomas J. Martin 80 Park Plaza, Newark, NJ 07101 201-430-8316 Mailing Address: P.O. Box 570, Newark, NJ 07101 Vic2 President Engineering and Construction ,

May 20, 1985 f

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Dr. Thomas E. Murley, Administrator U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I

• 631 Park Avenue King of Prussia,. Pennsylvania 19406

Dear Dr. Murley:

SIGNIFICANT CONSTRUCTION DEFICIENCY BIF BUTTERFLY VALVES HOPE CREEK GENERATING STATION On August 31, 1984, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. E.

Kelly, advising of a potentially significant construction deficiency concerning butterfly valves supplied by BIF Industries. On September 28 and November 2, 1984, interim reports were sent to your office. The following final report is provided in accordance with 10CFR50.55 (e) .

Description of the Deficiency Our Architect / Engineer and Constructor, Bechtel has informed us that a cleanliness inspection of two (2) thirty-six inch butterfly valves supplied by BIF Industries revealed exten-sive corrosion damage to the tapered pins securing the valve stem to the disc. A review of the BIF fabrication drawing determined that the pins were to be made of Monel (ASME SB 164, C1.B). However, chemical analysis of one of the corroded pins indicated that the material was apparently 400 series stain-less steel. Such a stainless steel would be galvanically dissimilar to the aluminum bronze disc material and susceptible to corrosion.

A review of purchase order P-305 (Q) identified a total of sixty-nine (69) valves of various sizes having aluminum bronze discs. Bechtel documented and controlled the discrepant hard-ware by means of Nonconformance Reports (NCR) Nos. 3711 and f.

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Dr. T. E. Murley. 2 5/20/85 5360. Utilizing a simple nitric acid test to verify disc pin material, Bechtel has determined that the deficient condition is limited to the four (4) thirty-six inch valves (Requisition Item Nos. 5.15 and 5.16).  ;

Corrective Action

-Bechtel has replaced the disc pins on the two (2) thirty-six inch valves that are installed in Unit.No. 1. Public Service Quality Assurance has issued Deficiency Report No. HQA-85-001 to document and control the two (2) stored thirty-six inch valves from Unit No. 2.

Safety Analysis An analysis of the safety implications determined that failure of either or both of the thirty-six inch butterfly valves would not adversely impact safe operation / shutdown of :lus plant. Per the Hope Creek design, these two valves are just inside the Q boundary on the A and B discharge lines to the cooling tower basin. The valves are designed to operate in the normally open position and can be closed to isolate either the A or B leg for maintenance purposes. Postulated failure in the closed position or the partially closed position is provided for through dis-charge of service water into the yard either through a rupture disc or through two (2) pressure activated twenty inch valves.

Failure .n i the full open position presents no additional con-sequences in this application. We therefore conclude that the noted condition of the subject valves is not reportable in accordance with 10CFR50.55(e).

Very truly yours,

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C Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C. 20555

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Dr. T. E. Murley. 3 5/20/85 C NRC Resident Inspector - Hope Creek P. O. Box 241 Hancocks Bridge, NJ 08038 Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, GA.30339 I