Part 21 Report - 1995-159

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.