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 operators for unusual mechanical noises, over- heating, or smoky exhausts. A check of the fuel and lube oil consumption and operating logs usually indicated need for adjustments, replacements or repair. 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. program, did not permit proper servicing, adjusting, or on-site repair of generators. Gasoline operated prime movers gave the most trouble, primarily from fouled plugs, and salt spray deposits on spark plug porcelains. It was often necessary to exchange units. A particular case was the exchange of two 75 KW generators at site Dog Scientific Power Plant DO-500 just prior to the Yankee event. Due to radiation exposure conditions existing at the site, this job had to be accomplished hurriedly. In general, preventive and corrective maintenance was accomplished on the 1000KW generators after 600-1000 operating hours; other units after about 300 operating hours. At these Overhead electrical distribution systems were subject to accelerated deterioration due to removal of carbon accumulation, check and ad- justment of all operating parts, cleaning of windings, and adjustment of brushes. wires will be done with copperweld wires. Salt incrustation of insulators, a severe problem in similar Pacific areas, was avoided by the type As the dividing line between operation and maintenance was sometimes thinly defined, it was ure washing routine. The continuous and necessary operation of elevated mobile equipment IV, Section 2, certain major items of non-routine a number of breaks in the overhead lines. This suggests the need for overhead clearances great- times the units were secured and opened for necessary to cover under “Operation” in Chapter maintenance. Briefly reviewed, these were as follows: (a) Relining of three General Motor 1000 KWgenerators due to deterioration of liner plating which was caused by use of a lube oil not properly compounded to neutralize the high sulphur content of the diesel oil furnished. (b) Repairs to Engine No. 2 of CMR power plant necessitated by a crank- case explosion caused by the seizure of #15 piston to its liner. (c) Repairs to Cummins engines in the Tare base power plant were required since, shortly after their installation, the action of the salt-laden atmosphere, and mes- senger and guy wires and galvanized hardware corroded. In the future, all replacements of guy of insulator used and by a periodic high press- such as cranes or trucks with A-frames caused er than is normal in construction camps. All submarine cables were tested periodically and repaired as necessary. On 9 March 1953, tele- phone cable number 105 between Elmer and Yvonne was found punctured; this required 700 feet of replacement cable. Breaks in sub- marine cables, usually attributable to chafing with the surge of the sea on sharp coral format- ions, 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 or replacement of fixtures and outlets, the fuel pump drive shafts and the bulb replacements, minor line repairs, and repiacement or repair of the various types of electrical apparatus and appliances. belts which drove the shafts, and the performed in two general categories: maintenance of equipment installed in buildings (i.e. they developed mechanical difficulties which resulted in the breaking of gear pump drive shaft pins. This was rectified by slackening the fan use of high temperature grease in the gear pumpdrive. resistant (d) Frequent cleaning of screens in the CMRpowerplant was due to excessive accumulation of marine growth and trash. In certain instances, radioactive contamination, combined with the exigency of the test Maintenance of communication systems was telephone switchboards, instruments, radio transmitters and receivers) consisting of normal checking, repairs, and parts replacement; maintenance of portions of the system installed outdoors (i. e. telephone aerial and submarine cables, antennae, transmitters and_ receivers mounted in boats and vehicles) required an unusual amount of maintenance due to deterioration caused by climatic factors. Page 5-3