* JOHNSTON ATOLL F &S NO. SCIENTIFIC TITLE 01106 Screen Rooms - Subtask A905 USER STRUCTURE /FACILITY NO. SCIENTIFIC STATION NO. TC 876 and 962 None BoD FOD . FUNDING AGENCY JTF MILCON ($000) ENGR PROC CONST TOTAL PRE-GO Prior Cost 16.4 294. 0 310.4 TOTAL 16.4 294.0 310.4 FURN CRO 9-64 COMPLETED DESCRIPTION These two buildings (completed in 1967) are 40 x 90-ft. concrete block structures with steel framed built-up roofs, and concrete floors. Each building consists of a 40 x 58 x 20 1/2-ft. high assembly area and a 32 x 40 x 16 1/2-ft. high area which contains a 20 x 30 x 14-ft. high RF shielded enclosure (screen room), a mechanical equipment room, a tool storage room, and a latrine. The screen room, assembly area, and equipment room have floors coated with spark-proof paint. Double sliding doors, 16-ft. 8 in. x 19-ft. 2-in. high, are provided in the south wall of the assembly area for monorail operations. The monorail has a 6-ton hoist with a minimum hook height of 15-ft. and extends the width of the assembly area plus approximately 19-ft. outside of the building. The screen room provides shielding protection in accordance with H& N-PC-38 and is the only portion of the building that is air conditioned and dehumidified. The remainder of the building is ventilated by roof mounted, gravity type explosion proof units. Wall mounted exhaust fans are also provided. Each building is provided with 480 volt, 60 cycle, 3 phase power for operating the air conditioning and dehumidifying unit, the exhaust fans, and the monorail hoists. A 45 kva, 3 phase transformer provides 120/208 volt, 3 phase power for lighting and other low-voltage requirements. All interior electrical instal lations in the assembly area, screen room, and tool storage room are explosion proof. Ground clips are provided at all exterior doors. A central compressed air system located in Building 965 will provide 250 cfm of air at 90-100 psi. Protective berms are provided on three sides of each building with the unpro- tected side facing the runway (see F&S No. 02066). DRAWINGS: VOL I 91-960-A2 91-960-Cl1 91-960-S2 91-960-M1 and M2 91-960-E1 91-960-W] 91-962-Al 91-962-S] 1-84 91-962-Ml1 91-962-E] 91-030-W6, W7 and W23 91-097-SS1 and SS2