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THE PRESIDENT, introducing Mr. Bullen and inviting him to present his paper, said he really needed no introduction to anyone present. He had founded his firm of Consulting Engineers in 1938 and had been concerned especially with foundation work. To many structural engineers he was well known as having been responsible recently for the structure of the Grosvenor House Hotel extension and as the Author of a paper he had presented in 1952 which had earned the Institution's Silver Medal. Also he had played a major part in the work of the Literature Committee over the last nine or ten years, being Chairman of that Committee for two periods; thus he had helped in the production
of the Institution's Journal and in obtaining suitable lecturers, and now he was to take the part of lecturer himself.
BRITAIN’S first full scale Experimental Fast Breeder Reactor is nearing completion, and this paper describes the unusual problems presented to the structural engineer in providing a housing for the reactor plant. Structural considerations played a part in
determining the shape of container to be used and that spherical form chosen dictated the shape of the biological shield, the novel construction of which is described. The design and construction of the sphere and its air-lock are described and some conclusions drawn on the design adopted and on the need of the engineer for further information i n designing large spheres for vacuum conditions and on the treatment of point loads.