cient capacity to serve as a standby, although the 118 kw unit could still carry the load. As a result it was necessary to arrange the water distillation schedule in such a manner that it could be shut down while the 118 kw unit was being overhauled. Figures 5.15-3 and 5.15-4 show the power and water distillation plant, equipment and piping plan for Japtan Island. Runit Island, The Aomon Group, andEngebiIsiand. At the time of the Reconnaissance Report, the total maximum demand including camp load, utility, and instrumentation demands for scientific structures was estimated at 200 kw each for Runit, Aomon, and Engebi, On this basis each power plant was designed to accommodate three 118 kw units of which two were to be installed,with space for the third unit. During the middle of 1950, the loads required for the experimental islands were considerably increased due to additional experiments to be incorporated in the tests. The indicated increase in power demands made the installation of a third unit on each of the experimental islands necessary, and three units of 195 kw capacity each were requisitioned July 3, 1950. As the electrical demands of the new experiments became firm, it developed that the increase on Runit would not be as great as on Aomon and Engebi and that for Runit the addi- tion of a 118 kw unit would be adequate. One unit of this size was available because it had been procured for an experiment on Bogallua and by this time the Bogallua experiment had been abandoned. Therefore a 118 kw unit was added to the power plant on Runit; a 195 kw unit on Aomon; and a 195 kw unit on Engebi. The third 195 kw unit was used in the power plant on Eniwetcok as previously described, Figure 5,.15-5 shows the power and water distillation plants and equipment plans for Runit, Aomon, and Engebi; Figure 5.15-6 shows diesel engine pipe for these power plants. The power houses on Runit, Aomon, and Engebi were designed to withstand the pressures resulting from the experiments in order to insure the proper operation of the equipment installed. All were built of reinforced concrete. The buildings were 42 feet wide by 51 feet deep with a ceiling height of 15 feet. A small mezzanine platform 14 feet by 17 feet was provided in one corner for auxiliary equipment. The walls and roof slabs on Runit and Aomon were 17 inches thick, and at Engebi 18 inches thick. The roof slabs were designed as beamless flat slabs supported on four reinforced concrete columns having flared capital heads and on the exterior walls. The walls were designed to span from the floor slab to the roof slab and special framing was provided around the door openings. The structures were set partially below grade level and mounded over with earth on three sides to a depth of two feet over the roof slabs, Wing walls were provided at the rear to retain the earth mound ing on the side away from zero so that access could be gained to the doors in the rear wall before and after the experiments. Steel blast doors were provided for two openings, one six feet wide by seven feet high for passing equipment and one two feet, two 5-210