ML20214E197

Annotated Part 21 Rept Re Cracked D34 Springs in Alco Spring Industries,Inc Type 3727WA Safety Valves.All Springs Being Examined.Springs Displaying Relevant Indications Will Be Replaced

ML20214E197
Person / Time
Site:	Catawba
Issue date:	02/03/1987
From:	Schaus R DRESSER INDUSTRIES, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-87, REF-PT21-87-066-000 PT21-87-066-000, PT21-87-66, NUDOCS 8705220002
Download: ML20214E197 (2)

Text

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l"O #L y @RESSEh ci DRESSER VALVE AND CONTROLS DMSION

~ Deesser industries,4th industrial VoNe North Amencon Cporations P o. Box 1430 = Alexoncio. Loursiano 71301 February 3,1987

'~2. H Y 2 e Director, Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 -

Subject:

Dresser:INO Alexandria, LA 10 CFR Part 21 File. #85-03 Cracked D34 SpringsTiri' consolidated

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Re result of our 10 CFR Part 21 F le #85-03 investigation is that a reportable defect does exist. .refore, this notification is being ky~

forwarded to you. \

%e subject investigation regards indications and fracture formation of the end coils of helical coil sprirus. These springs are used to supoly the closing force on safety valves at Duke Power's Catawba Nuclear Station.

We spring identification ntaber is #D34. The first fracture formation was found to propagate frm pre-service flaws in the ground eM surface. The second identified indications were fouM during subsequent magnetic particle examination. These were found to propagate fran the internally stamped spring identification number 4. -

As of this date, all subject springs have either undergone magnetic particle examination, or will, at the valve's next service cycle.

Any springs that display relevant indications will be replaced.

As an additional precaution, it has been reconmended that all valve spring end coils undergo re-magnetic particle examination to re-verify their suitability.

This event has been limited to the D34 springs supplied by ALCO Spring Industries,'Inc., of Chicago Heights, Illinois. Their examination will preclude any recurrence. All D34 AICO springs are installed at Duke Power's Catawba Nuclear Power Station.' '

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The Director, _ Office of Inspection & Enforcement U.S. Nuclear Regulatory Comnission February 3, 1987 Page 2 of 2 Please do not hesitate to call upon us if you should have any questions.

Sincerel A

R. . Schaus Executive Vice President - General Manager 6

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