Fig. 3.11 Configurations of Pool- and Loop-type Primary Coolant Systems heat removal by sodium circulating through the loops could be permitted. The LMFBR characterized in this section is a loop-type plant. The primary sodium system is designed to operate at a lower pressure than the secondary system. Thus, should a leak develop in an intermediate heat exchanger between these two systems, sodium would flow from the nonradioactive secondary system into the radioactive primary system. Finally, even though such leakage would not result in a radiological problem in the secondary system, the intermediate heat exchangers are designed to facilitate removal or replacement of faulty tubes. The overall steam cycle is expected to be similar to that of modern fossil-fired, steam-electric power plants. The turbine design assumed in this study is a set of tandem compound turbines like those used in fossil-fuel plants. Barriers to release of fission products are the fuel element cladding, the boundary of the primary coolant system, and the outer reactor containment. The outer containment consists of a leak-tight cylindrical steel or steel-lined concrete building with a flat bottom and hemispherical or ellipsoidal dome. The containment building houses the reactor and entire primary coolant system, spent fuel handling and storage facilities, and sodium service systems related to the primary system. The turbine configuration consists of two half-capacity tandem, compound, four-flow machines with 0.85-m last stages designed to operate at 3600 rpm. Inlet steam conditions at the high-pressure throttle valves are
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