The nuclear reactor does not require forced cooling in principle, but employs a radiation cooling system. As a new type of nuclear reactor, we propose a 2-dimensional nuclear reactor, in which conversion elements are assembled in layers, forming the reactor structure by sandwiching layers with the heat source in the center, as schematically shown in figure 3. In this case, the nuclear reactor is formed with the structure having no moving parts. Each reactor plant is about 100 m x 100m in size, and generates one-million kilowatts of power. By installing a large number of these reactors on the Moon, the required power can be obtained. With regard to the direct nuclear pumping laser system[2], nuclear reactors on the Moon can be replaced by this system when its technology attains full development. Supply of Fuels As of 1990, worldwide energy consumption is said to amount to about 0.36Q per year (IQ = lO^J = 3 x 10^ kWh). To reduce the risk of heavy dependence on a single source of energy supply, some 25% of global energy requirement will be generated at the LEP.
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