Patent Number: 
Section: claims

1. A passive main control room habitability system in a nuclear reactor power plant having a generation system for converting stored energy of compressed air into electrical power when the main control room habitability system is activated during a loss of all AC power scenario comprising:at least one tank for storing the compressed air;a pressure regulator located downstream of the at least one tank and connected thereto to receive and to reduce pressure of the compressed air to produce lower pressure compressed air;an air-driven mechanism located downstream of the pressure regulator and connected thereto to receive and expand the lower pressure compressed air;an eductor located downstream of the air-driven mechanism; andpiping to connect the tank, pressure regulator, air-driven mechanism and eductor,wherein, the lower pressure compressed air corresponds to an inlet pressure of the air-driven mechanism and wherein, the air-driven mechanism is structured to provide at least one function selected from converting said lower pressure compressed air into the electrical power and providing the lower pressure compressed air to the eductor to receive and distribute air into a control room of the nuclear reactor power plant. 2. The passive main control room habitability system of claim 1 wherein the mechanism comprises an air-driven turbine and a generator. 3. The passive main control room habitability system of claim 1 wherein the mechanism comprises an air-driven pump. 4. The passive main control room habitability system of claim 1 wherein the mechanism compresses an air-driven turbine, generator, and air-driven pump. 5. The passive main control room habitability system of claim 1 wherein the maximum pressure of the compressed air in the at least one tank is about 4000 psi. 6. The passive main control room habitability system of claim 1 wherein the minimum pressure in the at least one tank is about 3333 psi. 7. The passive main control room habitability system of claim 1 wherein the stream of lower pressure compressed air is about 120 psi. 8. The passive main control room habitability system of claim 3 wherein a pressure differential of 25 psi between the stream of lower pressure compressed air and design pressure of the eductor is used to operate the pneumatic pump. 9. A method of generating electrical power by converting stored energy of compressed air in an activated, passive main control room habitability system in a nuclear reactor power plant during a loss of all AC power scenario, comprising:pressurizing the compressed air in at least one storage tank;passing the compressed air through a pressure regulator located downstream of the at least one tank and connected thereto for receiving and for reducing the pressure of the compressed air, and for producing lower pressure compressed air;delivering the lower pressure compressed air to an air-driven mechanism located downstream of the pressure regulator and connected thereto for receiving and expanding the lower pressure compressed air, which corresponds to an inlet pressure of the air-driven mechanism, and for providing at least one function selected from converting said lower pressure compressed air into the electrical power and providing the lower pressure compressed air to an eductor for receiving and distributing air into a control room of the nuclear reactor power plant. 10. The method of claim 9 wherein the mechanism comprises a turbine and a generator. 11. The method of claim 9 wherein the mechanism comprises an air-driven pump. 12. The method of claim 9, wherein the mechanism comprises a turbine, a generator, and an air-driven pump.