Electric actuators for use in nuclear power plants（电动执行机构用于核电站）.pdfVIP

In December 2003, the Finnish electricity supplier TVO placed an order for the construction of the first EPR (European Pressure Reactor or European Pressurized Water Reactor) at Olkiluoto with the Framatome ANP/Siemens AG consortium. Framatome ANP, an AREVA and Siemens company, will supply the nuclear engineering (reactor), and Siemens AG the conventional engi- neering. In this report, Mr. Michael Herbstritt looks at the background of the development of the EPR and the role of AUMA actuators in this next generation nuclear power plant. Electric actuators for use in nuclear power plants By Michael Herbstritt, AUMA Riester GmbH Co. KG, Germany In a brochure entitled ‘The EPR, Actuators are geared motors which accordance with EN ISO 5210. Committed to the Future of Nuclear have been specially designed for the • The control unit includes two inde- Energy’, AREVA - one of two partners requirements in valve automation. pendent measuring units for meas- involved in the development of this • Due to its design, the electric uring the travel and the torque new and advanced type of pres- motor, usually a three-phase asyn- present at the valve. When reaching surised water reactor details the tech- chronous motor, has a high start- one of the valve end positions or nological advances of the EPR’s evo- ing torque to unseat valves from exceeding the set torque limit, the lutionary, safe and innovative design. their end position. respective electromechanical The improved safety concept com- • A worm gearing reduces the motor switch is operated. Depending on pared to that of the currently operat- speed to the output speed