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The basic job of a nuclear engineer is to design and test nuclear reactors. Because there are numerous methods for reactor construction, however, specialization results. Nuclear engineers who design power plants for naval submarines must be familiar with marine architecture; those who design land-based power plants have to be environmentally conscious while trying to maximize power output. Nuclear engineers have developed and are perennially perfecting the two basic types of reactors, the high-pressure water and boiling water reactors. Another responsibility of engineers is to test reactor designs and to improve old reactor models. For example, the fast neutron reactor has undergone several test runs to determine the practicality and safety of the design.