ML20210F474

Part 21 Rept Re Possible Sticking in Closed or Partially Open Position on Dresser 3050 Diaphragm Valves.Initially Reported on 850118.Disc Caps,Including Chamfers on Outside Diameter,Will Be Modified

ML20210F474
Person / Time
Site:	Millstone, Oconee, Perry, Oyster Creek, Columbia, Seabrook, Vogtle, Cook, 05000000
Issue date:	09/16/1986
From:	Schaus R DRESSER INDUSTRIES, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-86, REF-PT21-86-313-000 PT21-86-313, PT21-86-313-000, NUDOCS 8609250228
Download: ML20210F474 (3)

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S AL (oggSSgg DRESSER VALVE AND CONTROLS DMSION Deesser indusMes,Inc.

Industrior voNe North American Operations P.o. Box 1430

• Alexandna. Louisiana 71301 September 16, 1985 We Director, Office of Inspection & Enforcement U.S. Nuclear Regulatory Comnission Washington, D.C. 20555

Reference:

Dresser 10CFR21 File 85-01 3050 Diaphragm Valves Gentlenen:

This letter is to report the deficiency determined to be in Dresser's 3050 Diaphragm valves. The deficiency was first reported by Cleveland Electric Illuminating Company to the NRC on January 18, 1985, with copy to Dresser Industries. Dresser opened file 10CFR21 85-01, performed an investigation and evaluation. This deficiency has been determined to be reportable. Report is as follows:

Dresser's 3050 Diaphragm valves, sizes 1/4 inch through 2 inch were determined to contain a deficiency that, under certain circumstances, might cause the valve travel to stick in a closed or partially open position. The following was reported by Cleveland Electric Illuminating in their January 18, 1985, letter to the NRC.

"During leak rate testing activities, Dresser diaphragm seal globe valves, Figure 3050, were found to be sticking closed or partially open. It was determined that an erroneous leak rate could be obtained if the valve is thought to be open while, in fact, it is closed. Several of the Dresser diaphragm seal globe valves furnished under CEI Purchase Order P1690 have failed in this manner.

It has now been determined that this problem is apparently caused by .

insufficient inside diameter clearance between the disc cap and valve body along with sharp edges on the disc cap. Any uneven force applied by the spring or the diaphragm causes the disc cap to become tilted and bind. h is also resulted in increased friction of the disc cap on the disc guide which is thought to have caused the chipping of the " Glide-Aloy" plating on these components noted in the November 28, 1984, report."

Dresser's investigation confirmed the possibility of the above.

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The Director, Office of Inspection & Enforcement September 16, 1986 U.S. Nuclear Regulatory Comnission Page 2 of 3 The following utilities were determined to have purchased Diaphragm valves for use in safety related service:

Public Service of New Hampshire Seabrook Nuclear Power Station Seabrook, M1 General Public Utilities (Jersey Central Power & Light Co.)

Oyster Creek Nuclear Power Station Unit 1 Forked River, NJ Duke Power Oconee Nuclear Power Station Seneca, SC Northeast Utilities Millstone Nuclear Power Station Units 2 & 3 Waterford, CT Washington Public Power Supply System WPPSS Nuclear Projects No.1 and 4 Richland, NA Georgia Power Company Vogtle Nuclear Power Plant Waynesboro, GA Cleveland Electric Illtzninating Perry Nuclear Power Plant Perry, OH American Electric Power Service Corporation Indiana & Michigan Power Company D.C. Cook Nuclear Plant Units 1 & 2 Bfidgman, MI Dresser cannot determine whether the deficiency could result in a decrease in plant safety. Each utility must determine whether a safety hazard would exist in each valve application.

The corrective action which has been, will be or is being taken is as follows:

Modification of the disc caps to include diamfers on the outside dianeter will prevent the determined mode of failure.

./

e The Director, Office of Inspection & Enforcement September 16, 1986 U.S. Nuclear Regulatory Comnission Page 3 of 3 All identified utilities were notified to contact Dresser for nodification to be performed. Modifications can be done by Dresser or the utility involved.

Date of conpletion varies with the utility's determination of need and/or method of modification arrl scheduling.

Sincer 7, Yhlbk Schaus Executive Vice President & General Manager

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