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95159 FOXBORO CORP 29033 07-07-95 OTH LICENSEE: NORTHEAST UTILITES SITE: .FOXBORO CORP . EN NUMBER:29033 DOCKET: EVENT DATE: 07-07-95 RX TYPE: EVENT TIME: 00:00 VENDORS: NOTIFY DATE: 07-07-95 EMERGENCY CLASS: N/A REGION: 1 STATE: CT TIME: 13:16 OPS OFFICER: RUDY KARSCH 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH THE FOXBORO COMPANY, FOXBORO, MA., REPORTED HIGH FAILURE RATES TO DC/DC CONVERTER MODULES PROVIDED TO HADDAM NECK. FAILURES TO MODEL N-2AO-V2H OUTPUT CONVERTER MODULES CHARACTERIZED BY AN ABNORMAL POWER DRAW WERE REPORTED TO THE LICENSEE ON 7/6/95. D.C. COOK REPORTED TWO FAILURES TO THESE MODULES. THE FAILURE CAN CAUSE HIGHER LEVEL POWER SUPPLIES TO TRIP RESULTING IN LOSS OF POWER TO NUMEROUS MODULES. THE FOXBORO COMPANY IS REDESIGNING THE MODULE TO CURE THE PROBLEM. REPLACEMENT MODULES SHOULD BE AVAILABLE IN APPROXIMATELY 12 WEEKS.