HAWALL, F&SNO. 17004 USER UNA LOA SCIENTIFIC AND SUPPORT TITLE Power STRUCTURE. FACILITY NO. JTF SCIENTIFIC STATION NO. None BOD None FOD FUNDING AGENCY AEC ($000) ENGR PRE-GO Prior Cost PROC CONST Included in F&S Nos. TOTAL FURN 17002 and 17005 PRIOR YEARS ENGINEERING Drawings: Completed. JS 104-069-F4 F 104-069-El JS 104-069-E7 JS 104-071-E2 JS 104-069-E9 F 104-080-El and E2 PROCUREMENT Completed. CONSTRUCTION The Hilo Electric Company's transmission line serves the Mauna Loa site with 12.4 kv power. A 120/208-12,400 volt, 75 kva, 3 phase transformer transforms the incoming power for use by the AEC facilities. A 90 kw diesel generator serves as a back up source of power in the event of commercial power failure. Generator start-up and transfer of power is manually effected.(Completed in 1967.) Experience has shown that the present generator at the Mauna Loa site is inadequate. This 90 kw generator was derated to 60 kw capacity primarily due to the great altitude of the site, but actually encounters difficulty in providing an output of 45 kw. The generator will be replaced with a larger unit capable of providing satisfactory backup capability and with less erratic fluctuations in voltage and frequency. 17-3 VOL II