agr reactor safety

Posted by on Dec 29, 2020 in Uncategorized

Design development of lifting, supporting and handling components and the development of handling techniques. Physical Integrity of AGR Graphite Cores. 2. An Advanced Gas-cooled Reactor (AGR) is a type of nuclear reactor designed and operated in the United Kingdom. 12 Jan 2012. The graphite core of the AGR design has the potential to be the life-limiting component. Failure of a man-access penetration. The structures mentioned above are key components to the reactor coolant circuit, the purpose being to determine the flow path of the coolant through the moderator and fuel channels. The CoreStats code is designed to complement process-based approaches by focussing on what information on future behaviour can be obtained from historical data. HOW AGR CORE MODELLING SUPPORTS REACTOR SAFETY CASES Tom Bush 1 1 Senior Structural Analyst, AMEC Foster Wheeler, UK ABSTRACT EDF Energy can only operate an Advanced Gas-cooled Reactor (AGR) if the safety of operation is demonstrated by a safety case. The main safety features of most reactors are inherent – negative temperature coefficient and negative void coefficient. The Quintessa Supports EDF Energy in Nuclear Reactor Safety. AGRs were developed from the Magnox type reactor.These are the second generation of British gas-cooled reactors. These cores consist of about 3,100 graphite barrels stacked ~10 m high by ~10 m wide and ~10 m long. Potential failure modes are listed in the table below, together with brief comments on the design and operational features provided to afford protection against them. Continuing design development of fuel components. The integrity of the restraint cylinder connections to the core restraint system and the gas baffle will ensure that significant disturbance of the fuel and control rod channel alignment will not occur. Serious breach of the structure could cause a reduction in coolant flow over the fuel, which in turn, could lead to fuel failures. Credible failures of weld or parent material must not exceed sub-critical defects. The software employs some novel concepts, including a genetic algorithm for optimising channel selections, and allows every stage of the process to be documented, providing a clear and transparent audit trail. Low stress levels and in-service inspection facilities ensure that defects in weld or parent metal will not grow undetected during reactor life to critical lengths. Pressure induced loads in graphite columns, keys and the restraint system; Instability loading generated by brick bowing resulting from irradiation induced distortion; Vibration loading, including seismic loading; Self weights and dropped channel components; Any other interacting loads from in-channel components; Transient loads arising from differential response to power changes or faults; Irradiation induced stresses in the graphite; Thermal stresses in restraint and support structures. Provision of adequate cooling under normal and fault conditions. Other custom tools developed for EDF Energy include ASPECT, used to visualise and interpret information collected from eddy current scanning of the graphite core, and LoTAS, a web-based application used for managing and analysing data recorded as fuel is moved in the reactor. Quintessa has developed a custom software tool, CHANSELA, which is used to visualise information on the reactor cores and to support decisions on which fuel channels should be inspected to support continued safe operation. The fundamental nuclear safety requirements of the AGR cores are to allow unimpeded movement of control rods and fuel, and to secure adequate cooling of the fuel and core structure, both in normal and fault /hazard conditions. Please enable java script and try again to get complete user experience. “I commend this report and encourage councillors and those interested in the future of the remaining AGR reactors to read it. The graphite brick and key geometry is optimized to give the best possible component and interconnecting strength, which is derived from tests conducted on slices of graphite bricks. Design of the dome to prevent brick-to-brick jamming and to reduce cumulative core moments 's in... 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Name suggests, it is an advance on the earlier UK Magnox design of your browser is.!

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