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Download Rod Control System Load Resistor Kits Nuclear Automation Background
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Nuclear Automation Rod Control System Load Resistor Kits Background In 1969, the first solid state rod control system was installed in a U.S. nuclear power plant. Over the years, some sites have reported issues with the power supplies used in these systems. Specifically, the Lambda power supplies in the rod control systems have failed internally without causing enough of a drop in output voltage to initiate the built-in power supply non-urgent alarm. Since each power supply in the system is redundant and auctioneered, the internal failure of a power supply remains undetected until the companion power supply malfunctions or loses its source of AC power. When this happens, the failed power supply is called upon to support the load. At this point, its output voltage drops and triggers the nonurgent alarm; however, the power cabinet printed circuit (PC) boards have lost their DC voltage, causing the control rods to drop and trip the plant. Description Failures of Lambda power supplies are described in Westinghouse Technical Bulletin NSIDTB-87-10. A similar failure can occur with other rod control system power supplies. Westinghouse is committed to maintaining and improving reliability of the operating rod control systems. Therefore, in response to this issue, Westinghouse has developed load resistor kits to negate the effects of internal failures of power supplies in solid state rod control systems. Power Cabinet Load Resistor Kit 2A10018G01 June 2013 NA-0130 ©2014 Westinghouse Electric Company LLC. All Rights Reserved Benefits Part Number Description The load resistor kits draw small amounts of current from the power supplies. If an internal failure occurs in a power supply, the load resistor kit will cause output voltage of the power supply to drop low enough to activate the non-urgent alarm while the other power supply is supporting system load. The load resistor kit will improve plant reliability by preventing plant trips due to failures of the power supplies. Load resistor kits are available for each cabinet in the rod control system. Part number 2A10018G01 is for use in the power cabinet (one kit per power cabinet). One 4A49324G01 and one 4A49324G02 are required for the logic cabinet. 2A10018G01 Power cabinet load 1 kit needed for each resistor kit power cabinet 4A49324G01 Logic cabinet load 1 kit needed for logic resistor kit for PS1, cabinet PS2, PS3 4A49324G02 Logic cabinet load 1 kit needed for logic resistor kit for PS4, cabinet PS5, PS6 Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, PA 16066 www.westinghousenuclear.com Notes