Design, Eval of Heat Utiliz Systems - High-Temp Engineering

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FIG. 1. HTTR steam reforming hydrogen production system diagram. 27 JAERI has been studying application of the HTTR for this process in order to demonstrate industrial capabilities for the use of nuclear heat. The current schedule for testing of the steam reforming hydrogen production process coupled to the HTTR is 2007. Key development achievements include the design of a new concept of steam reformer using a bayonet type catalyst tube, a natural convection type of steam generator integrated with a natural ventilated air cooler and basic safety design criteria for accidents involving fire and explosion originating at the steam reforming plant.

Based on a parametric analysis of the IHX hot header and reducer structural integrity, the maximum allowable reactor coolant temperature change rate is limited to 15°C/h at a temperature of 650°C or above as the safety consideration. 4. HEAT UTILIZATION SYSTEM The HTTR has three major research and development goals as follows. · Establishment and upgrading of the technology associated with the high temperature gas cooled reactor · · Establishment of HTGR heat utilization technologies, and Innovative and basic technologies.

A heat utilization ratio (defined as the ratio of output hydrogen energy to total input thermal energy) of 73% is expected. This value is competitive to the conventional system where the heat utilization ratio is ~80%. 2 Engineering design (key components and operation procedure) The HTTR steam reforming system will be the first nuclear process heat application system in the world. The requirements of this system are for safe operation and high hydrogen production efficiency. To meet these requirements, JAERI has carried out design work and achieved the following improvements.

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