ML20024A426

Final Deficiency & Part 21 Repts U-53 Re Defective Plastic Molding Utilized in Circuit Boards Supplied by Foxboro Co. Initially Reported on 830511.Components Returned to Vendor for Rework/Replacement

ML20024A426
Person / Time
Site:	Callaway
Issue date:	06/01/1983
From:	Schnell D UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-83-996-000 10CFR-50.55E, PT21-83-996, PT21-83-996-000, U-53, ULNRC-632, NUDOCS 8306170279
Download: ML20024A426 (1)

Text

r v UNION ELECTRIC COM PANY 1901 GRATIOT STREET ST. Louis, MISSOURI June 1, 1983 .., L. No .oo. . . ..

DON ALD F. .CHN.LL P. O. MOX .49

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Mr. James G. Keppler, Director U. S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 ULNRC- 632

Dear Mr. Keppler:

Final 10 CFR 50.55(e)/Part 21 Report No. U-53 Callaway Plant Unit 1 On May 11, 1983 Union Electric advised you of a deficiency reportable under the requirements of 10 CFR 50.55(e)/Part 21 regarding the possibility of defective plastic molding utilized in circuit boards supplied to Union Electric by the Foxboro Company. The suspect moldings were utilized during the period May, 1981, (date code 2B8118) to July, 1982, (date code 2B8226). Foxboro's advisory stated that the damage, which cannot be detected by visual examination, would demonstrate itself in an identical manner to a blown fuse (loss of power). Fuse replacement, should the fault occur, would reveal a fracture or separation of the upper portion of the female jack pin.

Union Electric has determined that five circuit boards have been issued to the field for use in the Callaway Control Board with the suspect date codes. A search of the Union Electric warehouse yielded four-of the boards which also contain the suspect date codes.

! At the vendor's request Union Electric has removed the suspect components from the Control Boards and is returning them to l

the vendor's facilities for rework / replacement. The suspect components have been placed in the Union Electric warehouse and tagged l for return to the vendor. Union Electric is reporting this item l because these circuit boards are interchangeable and could be employed in safety-related applications in a variety of locations. Rather than performing a detailed analysis for reportability in all possible applications, we have decided to replace the boards because of their potential impact on components in the Callaway control board.

Very truly yours, Donald F. Schnell MHH/msc cc: H. M. Wescott, Region III Richard DeYoung, Director I &E NRC Resident Inspector, Callaway Plant (fg Missouri Public Service Commission 7 r306170279 830601 I.

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