ML20073T320

Significant Const Deficiency Rept Re Weld Defects in Class IE Cabinets.Initially Reported on 830125.Bailey Controls Co Reworked All Affected Cabinets

ML20073T320
Person / Time
Site:	Hope Creek
Issue date:	05/02/1983
From:	Martin T Public Service Enterprise Group
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8305110255
Download: ML20073T320 (2)

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Pubhc Service Electric and Gas Cornpany Thomas J. Martin 80 Park Plaza. Newark, NJ 07101 201430-8316 Mailing Address: P.O. Box 570, Newark, NJ 07101 Vice President Engineering and Construction

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Mr. James M. Allen, Acting Administrator U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 j

Dear Mr. Allen:

1 SIGNIFICANT CONSTRUCTION DEFICIENCY WELD DEFECTS IN CLASS lE CABINETS HOPE CREEK GENERATING STATION On January 25, 1983, a verbal report was made to Region I, Office of Inspection and Enforcement representative , Mr. L.

Tripp, advising of a potentially significant construction i deficiency concerning defective spot welds in four Class lE l cabinet assemblies. On February 28, 1983, an interim report was sent to your office. The following additional info rma-tion is provided in accordance with the requirements of 10CFR50.55(e).

Description of Deficiency Bailey Controls Company has determined that the ef fective areas of the cabinet spot welds in question measured .

approximately 54% of that designed (i.e., 0.19 inches in diameter rather than 0.28 inches specified). The scope of the problem was limited to the four termination cabinet assemblies delivered to the Hope Creek jobsite and an addi-tional eight digital cabinets so identified during fabrication.

Corrective Action Bailey Controls Company has reworked all of the affected cabinets. Bechtel Power Corporation, our Architect / Engineer j and Constructor, has performed shop inspection of the rework at the Bailey facility. The repaired cabinets have also been seismically requalified.

Since no additional cabinets remain to be f abricated by

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Systems Control Company of Iron Mountain, Mich ig a n , for the l Bailey purchase order, Bechtel has reviewed all other pur-

! chase orders for Class lE enclosures to ensure that the O k

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F Mr. James M. Allen 5/2/83 enclosure had been inspected at either the prime or the sub-supplier's location. These reviews indicated that adequate quality surveillance had been pe r f ormed and documented in each instance.

Safety Analysis Bechtel Project Engi neering has evaluated the spo t weld con-dition and concluded that there is sufficient design margin to preclude failure over the life of the plant. Howeve r , to provide conclusive evidence to that end would require either detailed model analysis simula ting a SSE or extensive shaker table testing of prototype cabinets with and without defec-tive spot welds. Given the criticality of the Class lE circuits routed through the subject cabinets, the safety im-plications of a postulated failure of the enclosure include the f ailure of any of these circuits which would adversely affect safe operation / shutdown of the plant. We therefore consider this condition to be reportable in accordance with 10CFR50.55(e).

Very truly yours, d

CC: Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C.

NRC Res ide nt Inspector - Hope Creek P. O. Box 241 Hancocks Bridge, NJ 08038