ML20137N849

Final Significant Const Deficiency Rept Re Oxidized Jumper Clips in Type Rz Push Button Modules.Initially Reported 850612.Jumper Clips Replaced W/Soldered Connections Using Bare Solid Wire

ML20137N849
Person / Time
Site:	Hope Creek
Issue date:	08/28/1985
From:	Martin T Public Service Enterprise Group
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8509190331
Download: ML20137N849 (2)

Text

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y '4EL Thomas J. Martin Public Service E!ectric and Gas Company 80 Park Plaza Newark, N.J. 07101 201/430 8316 Vice Presa3ent Eng.neering and Construction August 28, 1985 1,

go" Dr. Thomas E. Murley, Administrator U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Pegion I 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Dr. Murley:

SIGNIFICANT CONSTRUCTION DEFICIENCY BAILEY CONTROLS - RZ MODULES HOPE CREEK GENERATING STATION On June 12, 1985, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. E.

Kelly, advising of a significant construction deficiency concerning oxidized jumper clips in type RZ push button modules supplied by Bailey Controls. On July 17, 1985, an interim report was sent to your office. The following final report is provided in accordance with 10CFR50.55(e).

Description of the Deficiency During contact resistance testing of twelve (12) RZ modules, two (2) of the 72 push button switch units showed high resistance values (ll2K ohms and 125K ohms). These values are high enough to prevent the 862 digital and 7000 analog systems from performing as required by the depression of the RZ push button. Inspection of the push button switch units revealed oxidation of the spring steel jumper clip used to connect the normally open contacts in series.

The cause of the high contact resistance in the push button switch unit was determined to be oxidation between the jumper clip and the push button switch unit wiring terminal. The voltage and current levels used to interrogate the push button switch units are too low to prevent this oxidation.

8509190331 850828 PDR S ADOCK 05000354 pyg

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a 'Ik Dr. T. E. Murley 2 8/28/85 638 RZ modules are affected, including twelve (12) spares.

There are six (6) switches per module with one (1) jumper clip in each switch.

Safety Analysis The RZ modules are installed in the main Control Room Vertical Board, Operator's Console and the Remote Shutdown Panel to provide manual operation of various safety related pumps, motors, valves, breakers, etc. via the 862 digital and 7000 analog systems. Functional failure of the RZ modules could adversely impact safe shutdown of the plant. We therefore consider the subject deficiency to be reportable in accordance with 10CFR50.55(e).

Corrective Action Bechtel has issued Design Change Package No. 463 to replace the jumper clips with soldered connections using #22 AWG bare solid wire. As of August 25, 1985, this work has been completed on 513 of the affected RZ modules (80.4%). We anticipate completion of this work by September 15, 1985.

Very truly yours,

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

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