ML20134B003

Part 21 Rept Re Cracked Stem Assembly Detected in 3/4-inch Yarway Welbond Valve at non-nuclear Facility.Investigation Revealed Leakage Caused by Void in Bar Stock.Valves Sold to Nuclear Facilities Contained Stems.Review Continuing

ML20134B003
Person / Time
Site:	Susquehanna
Issue date:	09/26/1985
From:	Peszka F YARWAY CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-85-449-000 PT21-85-449, PT21-85-449-000, NUDOCS 8511110155
Download: ML20134B003 (4)

Text

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YaRWEY September 26, 1985 []j l Dr. Thomas E. Murley l Regional Administrator, Region 1 U.S. Nuclear Regulatory Comission 631 Park Avenue King of Prussia, PA 19406

SUBJECT:

Notification of the existence of a defect in accordance with 10CFR, Part 21.

Individuals infoming the Comunission.

Frank Peszka F Manager, Quality Systems Yarway Corporation Blue Bell, PA 19422 (215) 825-2100

[ Under direction of the Responsible Officer i J. F. Barclay

[ Vice President and General Manager

[ Yarway North America i

Same address i

Identification of the component.

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I A crackedfacility.

a non-nuclear stem usembly was detected in a 3/4" Yarway Welbond Valve at at Yarway during nydrostatic Five additional test. non-nuclear assemblies exhibited leakage We conclude from our investigation that the leakage is caused by a void in the bar stock used to manufacture the stems.

All six stems were from the same heat of bar material. Our records indicate that valves supplied to Nuclear facilities also contained stems manufactured from this heat of bar stock. No actual failures (breakage) were reported or detected.

The bar stock used to manufacture the suspected stems is 5/8" round bar, AL Tech stainless steel type 416, ASTM A-582-75 condition T. Heat Number 93876.

Stems from this ~ lot are identified by Yarway with the heat code "3876" on the outside diameter below the threads.

Identification of the fi ms supplying the material.

Valves and stems manufactured by Ya rway Corporation; no heat treatment of stems perfomed by Ya rway Corporation. Bar supplied by Peter A. Frasse Company, tion Dunkirk, Philadelphia, NY. PA and manufactured by AL Tech Specialty Steel Corpora-8511110155 850926 PDR ADOCK 05000387 S PDR lo(

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s Dr. Thomas E. Murley Page .

Nature of defect and safety hazard that could result.

Examination of a valve stem (Heat Code 3876) at a non-nuclear facility revealed a crack running the entire length of the stem. Micrographic examination at 50X by Yarway Corporation confimed the crack. Further examination revealed that the crack is extremely tight at the surface (0.D.), yet open on the inside.

(See photomicrograph. attached.) Hardness inspection determined readings at the upper limit of the specification. A review of the material test report indicates that carbon content and hardness were at the upper limits. One stem that leaked on hydrostatic testing was sectioned and a cracked face was revealed.

The conclusion reached is that the crack has resulted from an internal void in the material. Because the crack may be very tight or not open to the surface, -

the possibility exists that it would not be detectable by liquid penetrant or magnetic particle examinations.

The defect described above could result in leakage through the stem when the valve is in the open position. The detemination as to whether or not this would cause a safety hazard would have to be made by the user based on the application.

The stem assemblies found to be defective are from recent production. Stem assemblies used in valves delivered to the Nuclear sites identified later in this report were produced in 1980. It is possible that not all pieces of this Heat Code of bar stock contains the defect; and the earlier manufactured Nuclear valves may be unaffected. We have not received any reports of stem leakage from the Nuclear facilities we have identified.

Date the infomation was obtained.

The detemination that the defect could impact on , components shipped to Nuclear facilities was made on 9/25/85.

The number and location of components shipped to Muclear facilities that are suspect of having such a defect.

The stem is not a pressure boundary part and therefore does not require traceability. Yarway does record heat codes for stem assemblies, but does not maintain any traceability to tne valve serial number. It is only through a secondary system that we are able to detennine that stem assemblies made from this heat of bar were shipped to the following Nuclear facilities:

Stem Assembly Peet Nrber Quantity facility 952762 70 Consumers Power Midland, Michigan and/or Mississippi Power & Light Grand Gulf Nuclear Station Port Gibson, Mississippi 953585-01 25 Penna. Power & Light Susquehanna Station i Berwick, Pennsylvania l

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5 Dr. Thomas E. Murley Page '

954613 13 South Carolina Electric & Gas Virgil C. Suniner Nuclear Station Jenkinsville, South Carolina 958066-01 Part of 17 Illinois Power (Two heat code Clinton Station in lot of 17) Clinton, Illinois TOTAL 125

-The suspect bar stock is only used in 1/2" and 3/4" valve sizes.

Corrective action, responsible individual and completion date.

1. Bar stock, stems, stem assemblies and valves for Nuclear application in Yarway's plant will be reviewed for the heat code in question. Future ship-ments of this heat code will not be made until it is detemined that the material is free of defect. The review will comrrence on 9/26/85. Responsible individual.

R. G. Chew, Manager Quality Assurance.

2. A review of our design will be made to determine what, if any, changes are necessary. Responsible individual: G. Loos, Manager, Product Development, Power Products. Completion date: 11/25/85.

3. A further review of our secondary records will be made to detemine if specific valve serial numbers affected can be made. Notification will be made to purchasers. Responsible individual: F. W. Peszka, Manager. Quality Systems. Completion date: 10/25/85.

Confims verbal report given by telecon 9/26/85 to Mr. J. T. Wiggins, Chief, Materials & Processes by F. W. Peszka.

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Very truly yours,

_ hY. # t n F. W. Peszka ,

Manager, Quality Systems FWP:bt cc: J. F. Barclay R. G. Chew G. Loos R. A. Rose J. T. Wiggins, NRC Region 1

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