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The heart of the plant is of course the reactor. org/access_use#pd-google with a forest of pipes sticking out, like pins in a pin-cushion, from the upper dome; stuck to the bottom dome is another drum, small by the standards of the main one (not much bigger than a railway locomotive), into which run four large gas pipes, whilst just below the pin-cushion four more gas pipes emerge to carry off the hot gas to the heat exchangers. Inside this assembly is the reactor core with over a thousand tons of graphite, just over ten thousand uranium rods, and all the paraphernalia of control and operation.

Moreover, to put cartridges into a pressure vessel they have to be passed through holes and it is clearly necessary to reduce the number of these holes or else the pressure vessel will not be strong enough to withstand the desired gas pressure. org/access_use#pd-google through the pressure vessel. In this way the number of holes required to serve something like 1700 channels was reduced to a few more than a hundred. The machine designed to pass the cartridges through these holes into the required channel will be described in Chapter 3.

This firm had ready a solution in principle based on the work they did in 1947. org/access_use#pd-google pressures, in a so-called dual-pressure cycle. The method was as follows. The hot gas from the reactor was first to go through a heat exchanger in which good-quality steam would be generated at the highest possible pressure. The gas leav ing this section of the heat exchanger would still be com paratively hot. It would then be passed through a second section of the heat exchanger in which rather low-grade steam would be generated, the steam conditions being determined by the temperature of the emergent gas, which in its turn would be determined by the desired circulator power.

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