Part 21 Report - 1996-360

LICENSEE: AMETEK/DIXSON SITE: AMETEK/DIXSON EN NUMBER:30312 DOCKET: EVENT DATE: 04-16-96 RX TYPE: EVENT TIME: 17:30 VENDORS: NOTIFY DATE: 04-18-96 EMERGENCY CLASS: N/A REGION: 4 STATE: CO TIME: 18:28 OPS OFFICER: JOHN MacKINNON 10 CFR SECTION: CDEG 21.21(c)(3)(i) DEFECTS/NONCOMPLIANCE AMETEK/DIXSON PROSERIES BARGRAPH MODELS SA101A, SA202P, SN101P, AND SN202P UNITS CAN POTENTIALLY INDICATE AN ERRONEOUS UNDER RANGE CONDITION AT A VERY SPECIFIC INPUT POINT. THE FOLLOWING PORTION OF THIS TEXT IS TAKEN FROM A FACSIMILE RECEIVED FROM AMETEK/DIXSON, LOCATED IN GRAND JUNCTION, CO. " ... AN APPARENT ANOMALY HAS BEEN IDENTIFIED IN THE AMETEK/DIXSON PROSERIES BARGRAPH MODELS SA101P, SA202P, SN101P, AND SN202P. THE INDICATION CAUSED BY THE ANOMALY IS AS FOLLOWS: DEPENDING ON THE CONFIGURATION OF THE SPECIFIC BARGRAPH, i.e. CURRENT OR VOLTAGE, THE UNIT CAN POTENTIALLY INDICATE AN ERRONEOUS UNDER RANGE CONDITION AT A VERY SPECIFIC INPUT POINT. EXAMPLE, IF THE UNIT IS CONFIGURED FOR 4/20mA RANGE, THE ANOMALY CAN OCCUR AT APPROXIMATELY 91% OF SPAN. "WHEN THE CONDITION OCCURS, THE BARGRAPH WILL INDICATE A ZERO READING ON THE BARGRAPH PORTION, INDICATE DASHES ON THE DIGITAL DISPLAY PORTION, AND THE RELAYS (IF USED) WILL TRACK THIS INDICATION. THIS IS TYPICALLY A MOMENTARY CONDITION, AND THE UNIT IMMEDIATELY RETURNS TO NORMAL OPERATION AFTER THE ANOMALOUS CONDITION STOPS. THIS IS A VERY UNCOMMON CONDITION, AND IF THE CONDITION OCCURS, THE RESPONSE BY THE OPERATOR IS UNKNOWN TO AMETEK/DIXSON SINCE THE BARGRAPHS ARE USED IN VARYING APPLICATIONS. IT IS BELIEVED THAT AN INCORRECT RESPONSE WOULD BE THE WORST CASE CONDITION, HOWEVER, ITS LOW PROBABILITY OF OCCURRENCE AND VERY SHORT TERM DURATION WOULD TEND TO LIMIT THIS LIKELIHOOD." AMETEK/DIXSON IS CURRENTLY NOTIFYING THE AFFECTED USERS (EXPECTED COMPLETION DATE IS 4/22/96). THE FOLLOWING IS A LIST OF POWER PLANTS THAT HAVE RECEIVED THE CLASS 1E "PRO" SERIES INDICATORS: ENTERGY OPERATIONS: ARKANSAS NUCLEAR ONE FLORIDA POWER AND LIGHT: ST. LUCIE NPP FLORIDA POWER AND LIGHT: CRYSTAL RIVER UNIT 3 NORTHEAST UTILITY: MILESTONE SITE OMAHA PUBLIC POWER DISTRICT: FORT CALHOUN STATION GEORGIA POWER COMPANY: PLANT HATCH

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