FRA020056.3 VOLETS N4 GB - AREVA

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The reactor containment (1) The reactor building sits on a concrete foundation basemat and features a double containment. The internal containment is constructed of prestressed concrete while the external containment is of reinforced concrete. Inside the containment, a cylindrical structure supports the reactor coolant system, and blockhouses ensure protection and separation of the equipment and systems. The 4-loop reactor coolant system (2) Each loop, to extract the heat produced by the reactor core, contains a reactor coolant pump and a steam generator. A pressurizer controls the pressure of the primary system. 1 The core configuration (3) The reactor core is composed of 205 fuel assemblies of the 17x17 type and 73 control rod assemblies with silver-indium-cadmium and boron carbide as neutron absorbers. The core active height is 4.27m. 2 3 More compact and efficient primary coolant pumps The core protection system The safety classified Digital Integrated Protection System (DIPS) of the core automatically shuts the reactor down whenever conditions reach operational limits, and it actuates the engineering safety features to mitigate the consequences of that situation. The DIPS is an example of the N4’s advanced Instrumentation and Control, the latest in digital technology. VERY HIGH EFFICIENCY IMPELLER Fully computerized control room HYDROSTATIC BEARING Suction pressure Discharge pressure • higher hydraulic efficiency due to a new impeller-diffuser design; • hydrostatic bearing surrounding the impeller to reduce shaft vibrations; • more effective thermal barrier to protect the seals and providing easier access for inspection and maintenance. • two operator work-stations, connected to a redundant computer system; • one supervision workstation used by the shift supervisor and the safety engineer. An auxiliary panel, with conventional individual controls provides the back up to the computerized control systems. Special attention has been paid to design an ergonomic and operator-friendly N4 Man-Machine Interface.
Competitiveness Due to its lower base-load production cost* in the range of € 30 per MWh, the N4 holds a competitive advantage over the other existing nuclear and fossil electricity generating plants. * Production cost includes the overnight construction cost, financial costs during construction, operation and maintenance costs, and fuel cycle costs. Evolutionary design The N4 is the result in terms of design, construction and operation, of an uninterrupted evolutionary and innovative process. It is the most modern reactor currently operating. It benefits from the experience feedback and continuous improvement of the previous series of 900 and 1,300 MW NPPs. It features significant technical innovations, based on extensive industrial R&D, supporting its enhanced performance and competitiveness level such as: advanced Steam Generators and Primary Coolant Pumps, plus technologically unmatched digital Instrumentation & Control and Man–Machine Interface. Engineering, manufacturing and construction can be performed relying on existing nuclear industry capabilities. CONTINUOUS IMPROVEMENT PROCESS OF THE FRENCH NUCLEAR FLEET INDUSTRIAL R&D EXPERIENCE FEEDBACK DECENNIAL SAFETY RE-EVALUATION 900/1,000 MW 1,300 MW N4 FA: fuel assembly 34 units +11 exported 3 loops 157 FA* 17x17 type Steam pressure: 58 bar Efficiency: 33% 20 units 4 loops 193 FA* 17x17 type Steam pressure: 64,8 bar Efficiency: 34% • Core Digital Integrated Protection System (DIPS) • Double containment 4 units 4 loops 205 FA* 17x17 type Steam pressure: 72,3 bar Efficiency: 35% • Steam generators with axial economizer • Primary pumps with new hydraulic design and hydrostatic bearing • Computerized control room and man-machine interface
Page 1 and 2: N4 The most advanced reactor in ope
Page 3: Successful implementation at Chooz

FRA020056.3 VOLETS N4 GB - AREVA

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