A relatively warm interior is possible when the pressure hull is used 

 for heat transfer. However, humidity would be high because of the water and 

 steam systems. The upper level would be thermally insulated from the rest of 

 the plant to maintain a reasonable temperature and humidity for the electronic 

 and control equipment. An air conditioning unit that uses a forced convection 

 cooler with water circulating against the hull could be used for the upper level 

 area. 



A pressure-compensated battery supply located outside the pressure 

 hull would supply power for plant start-up, monitoring and standby, deploy- 

 ment and recovery operations, and emergency power. Batteries would provide 

 power for navigational lights and signalling devices during deployment and 

 recovery. The total battery power requirement was estimated not to exceed 

 15 kw-hr, with about 5 kw-hr allowed for plant start-up. A battery charging 

 system was included to automatically maintain the batteries at full charge. 



The turbine generator plant would deliver 100-kw, 480-volt, 3-phase, 

 60-Hertz power for the 600- and 6,000-foot depths. The transmission cable 

 between the power module and the load module of the in-situ system would 

 be a three-conductor, shielded, grounded, neutral, armored cable. Conductor 

 size would be 4 AWG. Duplicate monitoring and control of the power plant 

 would be provided in both the power module and in the load module. A 

 multiconductor control cable would be provided between the two modules. 



The protective system for the in-situ power system would include 

 standard differential relay circuitry for the generator, a differential zone for 

 the cable transmission between modules, and circuit protection for the control 

 power as well as the generator exciter circuits. The philosophy of operation 

 would be to keep the system in operation until loss of equipment is inevitable, 

 at which time it will shut down. Loss of control power would also shut the 

 plant down. 



A forced descent-ascent concept was selected for emplacement of the 

 in-situ power system. The anchor would be located on the bottom by using 

 soundings in conjunction with a leveling device or by the more elaborate 

 method of using a remote television camera mounted on the anchor cable. 

 The camera method would probably be used at the 600-foot depth; the 

 bottom leveling device and surface soundings at the 6,000-foot depth. 



Once the anchor has been set on the bottom site, deployment of the 

 in-situ plant would begin by placing the plant's primary and secondary systems 

 in a remotely actuated start-up mode. Final ballast and trim adjustment 

 would be made, and descent stabilizers would be rigged for descent. The 

 descent may be initiated by flooding the main ballast tanks, but the winch- 

 down method would be used for the actual descent. A bottom-sensing 

 weight would begin to decelerate the descent velocity 150 to 200 feet above 

 the bottom. When the plant is on the bottom, a triggering device would trip 

 the winch switch to stop the winch operation. 



103 



