1. There is no problem of cladding the metallic fuel No control rods are required, therefore, control is much easier than other types. helium or carbon dioxide, is used as the coolant. It is also called as Gas Cooled Graphite Moderated (GCGM) reactor. The processing of fuel is simple. The Gas Cooled Reactor was one of the original designs. The only gas cooled-reactor that ever existed in the United States was at Fort St. Vrain Nuclear Station, which has been shut down. The evolution of gas-cooled reactors is described and the advantages of helium as a reactor coolant stemming from its inertness and the fact that it is a single-phase coolant are discussed. A typical gas phase polymerization of olefins takes place at 80 to 100 °C and 30 - 35 bar reactor pressure. The High-Temperature Gas-Cooled Reactor (HTGR) forms the basis for the current design of a Gas-Cooled Fast Breeder Reactor (GCFR). Water cooled reactors, in contrast, were already operating fairly close to their maximum temperature based on the triple point of water. The basic diagram of gas cooled reactor power plant is shown in figure, Gas Cooled Reactor Power plant | enggarena.net Gas Cooled Reactor Power Plant It uses natural Uranium as fuel. The major advantage of this reactor is that the fuel need not be enriched. 14 AGR reactors have been built, located at 6 different sites and seven stations, Figure 1.1. and Table 1.1. Advantages and disadvantages of HWR (or) CANDU type Reactor . 3. Each station is supplied with twin-reactors, the site of Heysham has two Inert gas, e.g. The advantage of the design is that the coolant can be heated to higher temperatures than water. This potential advantage may have helped to convince planners to provide ongoing support for gas reactor cooled research and development, but it did nothing to encourage actual sales. At the top of the reactor gas is removed, compressed and cooled and fed back into the reactor to control the temperature. In the Gas Cooled Reactor (GCR), the moderator is graphite. Gas-cooled reactors have been developed for the most part in the United Kingdom and have been used in several other countries. The present report comprises a technical description of the Advanced Gas cooled Reactor (AGR), a reactor type which has only been built in Great Britain. The very-high-temperature reactor (VHTR) (see Fig. The reactor vessel may be built to withstand low pressure, therefore, the cost of the vessel is less. A gas cooled reactor was first developed in U.K. which uses C02 as coolant instead of water and graphite as moderator. 4.30) is a further step in the evolutionary development of high-temperature reactors (HTRs).The VHTR is a helium-gas-cooled, graphite-moderated, thermal-neutron-spectrum reactor with a core outlet temperature > 900°C, and a goal of 1000°C, sufficient to support high-temperature processes such as production of hydrogen … Advantages . The very-high-temperature reactor (VHTR), or high-temperature gas-cooled reactor (HTGR), is a Generation IV reactor concept that uses a graphite-moderated nuclear reactor with a once-through uranium fuel cycle. The VHTR is a type of high-temperature reactor (HTR) that can conceptually have an outlet temperature of 1000 °C. 2. Gas-Cooled Reactors in the USA and the Federal Republic of Germany and the commissioning of the THTR-300 have proven that this technology is available for electricity generation and process steam production. 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