ML20096C283

Final Significant Const Deficiency Rept Re Capstan Springs in Shock Arrestors Supplied by Itt Grinnell.Initially Reported on 831024.Arrestors Returned to Vendor for Rework

ML20096C283
Person / Time
Site:	Hope Creek
Issue date:	08/16/1984
From:	Martin T Public Service Enterprise Group
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8409050194
Download: ML20096C283 (2)

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'd Thomas J. Martin Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 201/4304316 -

Vice President Engineering and Construction

• August 16, 1984 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 DEFECTIVE CAPSTAN SPRINGS IN SIIOCK ARRESTORS HOPE CREEK GENERATING STATION On October 24, 1983, a verbal report was made to Region I, Of fice of- Inspection and Enforcement representative, Mr. E.

M. Kelly, advising of a potentially significant construction deficiency concerning defective capstan springs in mechanical shock arrestors supplied by ITT Grinnell. Interim reports were sent to your office on November 23, 1983, February 29, May 4, and July 25, 1984. The following final report is provided in accordance 'with 10CFR50. 55 (e) .

Description of the Deficiency ITT Grinnell advised our Architect / Engineer and Constructor, Bechtel, of a potential problem with defective capstan springs in sizes 1 and 3 mechanical shock arrestors supplied by Pacific Scientific, a sub-supplier of ITT Grinnell. Several PSA-1 mechanical shock arrestors under test at Union Electric >

Callaway Station revealed broken capstan spring tangs. Metal-lurgical testing indicates that stresses induced during spring forming resulted in hydrogen cracking during subsequent silver plating. Based on information supplied by ITT Grinnell, Bechtel identified eighty-seven (87) suspect arrestors supplied to !! ope Creek.

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~0: o Dr. T. E. Murley 2 8/16/84 Corrective Action Taken Eighty-six (86) mechanical shock arrestors were returned to Pacific Scientific for inspection and rework, as required.

Pacific Scientific replaced the capstan springs in twenty-five (25) shock arrestors.- All of the mechanical shock arrestors have been returned to the Hope Creek site. The one shock arrestor identified as missing has been added to the checklist to be used during N-5 data package review.

This administrative control will ensure that it is not inadvertently installed in any ASME Section III system.

Safety Analysis The twenty-five (25) affected shock arrestors were included in, but not limited to, essential safety _ related and Nuclear Class 1 piping systems. Failure of the shock arrestor to perform properly could lead to piping overstress, equipment nozzle overload and load increases on pipe supports. Since' these conditions could adversely affect safe shutdown of the plant, the defective capstan springs are considered to be a reportable deficiency in accordance with 10CFR50.55 (e) .

Completion of corrective action was documented on Nonconform-ance Report No. 2701 on August 3, 1984.

Very truly yours, l .

l l

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