CHAPTER II, SECTION 5 Figure 2-202. Scientific Power Plants, at each end and parallel to the side walls. At the centerline of the building there was an inverted reinforced concreie beam al the .vef. This heam extended the full length of the building and rested on two-foot by one-foot reinforced eoncrete columns at each end. The end wall at the retaining walls extended ahove the roof slab and acted as a retaining wall for the earth on the roof slab. Adjacent to the inverted beam and spaced 15-foot on centers were three reinforced concrete boxes 3’ - 10” x 6’ - 2” x 6’ - 6” high which opened into the building through the roof. Each of these boxes had a steel shutter on the three-foot ten-inch side, and the shutters rested on the inverted beam. The inverted concrete beam was supported by steel columns which rested on spread footings below the concrete floor slab. Generator foundations were located under each of the three box openings in the roof. Figure 2-201 shows typical foundation for generator mount, ELECTRICAL. Building NA-500 was the elect- ric power generation plant that supplied the scientific power requirements at site Nen. There were two LOOKW and one 122KW, 2400 V, 3 phase diesel generator units or firm capacity of 200KW and a maximum capacity of 322KW. Fach generator had its own generator control panel in the main switchboard. In addition to this, the main switchboard contained a synchronizing panel plus three feeder sections. A pushbutton was provided in Station 70 to shat Installed Generator next to the camp power house and a “tie feeder” was provided so that a portion of the camp electrical load could be supplied from TA-300 until scientific demands required its entire output. As the critena for the Stations became firm, mower requirements were continuously increased. On 28 August 1953, it was necessary to add a 135KWporta>le generator in order to increase the KWcapacity to 366K W. Figure 2-202 shows a generator installed with wall framing in place and wall siding being installed. Building CH-560, at site Charlie, served the Stations on that island. Like TA-500, provisions were made to connect this power house to the camp power house. The characteristics of the electrical distribution system were 21400 V, 3 phase, 60 cycle, 3 wire and it was delivered by direct hirial cable to local transformer Substations. At these Sub-stations the primaryvoltage was stepped down to a nominal secondary voltage of 120.208V, 3 phase where it was delivered to each of the main switchboards of the respective Stations. Figure 2-203 shows a typical generator control panel. At Ursula an existing protected power down the entire power plant. This pushbutt on house, .Building U-108, was reactivated. A 4160 V, 3 phase distribution system was decided on so that a minimum voltage drop would occur at the Scientific Stations. To accomplish this with a minimum of new equipment, three 100 KVA, 2400-2400. 1 phase transformers were connected in delta-wye and located just outside Building TA-500, at site Tare, served the Stations on site Sugar and Tare. It was loca.ed ution system served six transformer banks, one located at cach of the following Stations: 72.02, 63, 2301, 2201, 2231.01 and 60. The scientific electric power requirements for the Scientific Stations served by this power house increased and it was found necessary to increase the capa- also controlled the detonation of the explos.ve links which caused the closing of the blast do-rs on this building. The building was lighted by standard industrial lighting fixtures. the power house. This 4160V. 3 phase distrib- Page 2-203