A gas-cooled reactor (GCR) is a nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant.Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor.. The coolant is set aside at a low pressure to boil the water. The boilers are of the once-through type. Although there are many other types of reactor cooled by gas, the terms GCR and to a lesser extent gas cooled reactor are particularly used to refer to this type of reactor. The rods are in turn attached to restraint beams that form sixteen-sided polygons around the core at each inter-layer position, the beam ends being loosely connected as a secondary restraint feature. As shown by Figure 12 the lower 3 layers of the core are connected to the vertical restraint columns. The restraint structure also exhibits a high degree of redundancy to cater for the possibility of local component failure. Core Restraint Structure5. Nuclear reactors use uranium that will process into tiny ceramic pellets & stacked jointly into fuel rods. Evaluate cycle efficiency and performance of a gas cooled reactor … The gases are less prone to react che… There are a total of 37 black control rods. The slightly enriched (2 – 3%) uranium used as fuel in AGRs is made up in the form of cylindrical pellets. Fuel Assemblies9. So that it can act like a coolant as well as mediator to assist while reducing the speed of the neutrons. at an AGR power station this is nuclear energy and at a conventional power station is the energy of combustion). Gas circulates from Bottom to Top and gets heated. The components of an AGR reactor core are discussed in further detail below. On the inside of the vessel there is a steel liner that is gas-tight – the main purpose of which is to provide a leak-tight membrane to prevent the release of hot carbon dioxide gas through the concrete and penetrations, therefore minimizing the risk of release of radioactivity from the plant, as well as serving as a foundation for the cooling and insulation systems that protect the concrete from excessive temperatures and temperature gradients. Brick shapes and loose keys are optimized for strength and keying is designed to accommodate core movement and seismic loading. The material that is used to transfer the heat from fuel to a turbine through the core like water, liquid sodium, heavy-water, helium, or something else is known as coolant. These turbine-generator units are exactly the same as those to be found at a coal or oil-fired power station of equivalent electrical output (the only difference being the source of heat i.e. All the tendon strand anchorage loads can be checked individually and tendons re-tensioned or replaced if need be. So to give safety from them, concrete or lead thick layers are used around the reactor. At the top of the fuel stringer is the fuel plug unit. The nuclear reactor diagram is shown below. to regulate the power output of the reactor core. So that electricity can be generated. Even though the basic working principle is same for every fission power plants, thermal reactors can be classified in several categories based on the moderator and coolant fluid, namely, Boiling Water Reactor (BWR), Pressurized Water Reactor (PWR), Pressurized Heavy-Water Reactor (PHWR), Advanced Gas Cooled Reactor (AGCR), etc. The circular bricks are interconnected by loose graphite keys, while the connection between circular and interstitial bricks is through a key that is an integral part of the interstitial brick. The boron bead device consists of a store loaded with boron glass beads of 3mm diameter which are injected into 32 of the secondary shutdown channels in the reactor core. This article discusses an overview of a nuclear reactor, components, and types. The alpha & beta particles can be stopped by using thick layers of plastics or metals. The cost of developing the reactors was also a reason that countries have stopped working on the technology. 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