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The designer had been given the date at which the plant must begin operation. This was the one immutable figure in all his planning; nothing might be allowed to alter it. From his experience he could estimate the tune required for each major stage in building the plant—design, construction, operating trials. By relating these periods of time to the target date, he could draw up a programme show ing the dates on which each phase must begin for each section of the plant. This analysis is presented in the form of a diagram in which the time span for each phase is shown as a thick horizontal line; each line ends at a vertical line corre sponding to the target date.

After the lower dome the first cylindrical section was put in, to rest exactly on the edge of the inverted dome. The two units were then welded together. The second cylindrical section followed and after it had been welded in place the diagrid was lowered into the cylinder and placed on its brackets on the inside of the lower dome. Finally came the upper dome, the pin-cushion. This was the most complicated part of the structure because of the stub tubes. These tubes had to register with the channels in the graphite core inside the pressure vessel and with holes through the concrete roof (yet to be built) that would cover the octagonal shields.

He needs what he calls high-grade steam, that is steam at high tempera ture and therefore high pressure, produced by boiling water in closed vessels. The higher the temperature the more 34 CALDER HALL ATOMIC POWER STATION , efficiently the engine will work. The designer therefore aims i at a boiler which produces the greatest quantity of steam at the highest possible temperature. In a reactor like Pippa the maximum boiler temperature is fixed by the temperature of the gas as it comes from the core.

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