CHAPTER V, SECTIONS 2 and 3 Very little maintenance work was required for the Scientific Structures. Principally, the work consisted of painting the towers as necessary and lubricating bolts, nuts, dogs and other movable parts of the various structures. Electric fixtures. wiring and plumbing facilities were repaired when required. SECTION 3 ELECTRICAL SYSTEMS During operating periods, all electrical generating units were under observation by opcrators fur unusual mechanical noises, overheating, or smoky exhausts. Ao check of the fuel and dube od consumption and operating iogs usually indicated need for adjustments, replacements or ropair, A maintenance history was kept on each unit into which all items of maintenance work were entered. Repeated or too frequent replacement of the same parts indicated the need for corrective action. In general, preventive and corrective maintenance was accomplished on the lOOOKWpenerators after 600-1000 operating hours; other units after about 300 operating hours. At these times the units were secured aad opened for removal of carbon accumulation, check and adJustment of aii operating paris, clean of windings, and adjustment of brushes. As tne dividing line between operation and maintenance was sometimes thinly defined, it was necessary to cover under “Operation” in Chapter LV, Section 2, certain major items of non-routine maintenance. Brietly reviewed, these “were as follows: (a} Pelining of three General Motor 1000 KW cenerators due to deterioration of lincr plating which was caused hv use of a lube oil not properly compe snded to neutralize the high sulphur content of the diesel oil furnished. (b) Repairs to Engine No. 2 of CMR power plant necessitated by a crankcase explosion caused by the seizure of +15 piston to its liner. (c) Repairs to Cummins engines in the Tare hase power plant were required since, shortly after thei installation, they developed mechanical! difficulties which resulted in the breaking of the fuel pump drive shafts and the gear pump drive shait pins. This was rectified by slackening the fan belts which drove the shafts, and the use of high temperature resistant grease in the gear pump drive. (d)} Frequent cleaning of screens in the CMR power plant was due to excessive accumulation of marine growth andi trash. In certain instances, radioactive contamination, combined with the exigency of the test prograia, did not permit proper servicing, ad- jU-ting, OF On-site repair of generators. Gasoline Operated prime movers gave the most trouble, primanly trom fouled plugs, and salt spray deposits on spark plug poicelains. It was often necessary to exchange units. Ao particular case Wis the exchanee of two 75 KW. generators at site Doe Srtentifie Power Plant DO-500) just prior to the Yankee event. Due to radiation cAposure conditions existing at the site, this job had to be accomplished hurriedly. Ovechead clectrical distribution systems were subyoet to accelerated deterioration due to the action of the salt-laden atmosphere, and mes- senger and say wires and galvanized hardware corroded. In the future, all replacements of guy wires will be done with copperweld wires, Salt incrustation ef insulators, a severe problem in similar Pacitic areas, was avoided by the type of insulator used and bya periodic high pressure Washing routine. “Phe continuous and necessary operation of clevated mohile equipment such as cranes or trucks with A-frames caused a number of breaks in the overhead lines. This sugyests the need lor overhead clearances greater than as normal in construction camps. All submarine cables were tested periodically and repaired as necessary. On 9 March 19453, telephone cable number 104 between Elmer and Yvonne was found punctured: this required TOO teet of replacernent cable. Breaks in) submarine cables, usually attributable to chafing with the surge of the sea on sharp coral formations. were, in several cases, caused by ships dragging anchors across them even though the “Cable Crossing” signs were conspicuous. For the post-test operating period, the painting of 149 transformers was scheduled. Routine maintenance of interior circuits covered mainly repair ar replacement of fixtures and outlets, bulb rephacements, minor line repairs, and replacement or repair ot the various types of electrical apparatus and appliances. Maintenance of communication svstems was performed in two general categories: maintenance of equipment installed in buildings (1. e. telephone switchboards. instruments, radio transmitters and reeeivers) consisting of normal checking, repairs, and parts replacement: main- tenance of portions of the system instailed outdoors (1. 6 telephone aerial end submarine cables. antennac., transmitters and reccivers mounted in boats and vehicles) required an unusual amount of maintenance due to deterioration caused hy climatic factors. Page 5-3