Patent Number: 062401548
Section: claims

1. A cooling system for a CEDM contained in a head lift rig of a nuclear reactor comprising: at least one pipe through which cooled air is forced under pressure into the head lift rig; and  means for regulating air flow;  wherein, when said cooled air is circulating, said means is held closed by pressure created by said circulating air, but when said cooled air is not circulated, said means automatically fall open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig.  at least one pipe through which cooled air is, forced into the head lift rig; and  a louver;  wherein, when said cooled air is circulating, said louver is held closed by pressure created by said circulating air, but when said cooled air is not circulated, said louver automatically falls open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig.  forcing cooled air through at least one pipe into the head lift rig; and  regulating a vent opening in either of said at least one pipe or said head lift rig with a louver;  wherein, when said cooled air is circulating, said louver is held closed by pressure created by said circulating air, but when said cooled air is not circulated, said louver automatically falls open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig. 2. The system of claim 1, wherein said means for regulating air flow is self-actuating means for regulating air flow through a vent opening in either of said at least one pipe or said head lift rig. 3. The system of claim 2, wherein said means are disposed over a vent opening in said at least one pipe. 4. The system of claim 2, wherein said means are disposed over a vent opening in said head lift rig. 5. The system of claim 2, wherein said means are disposed over a first vent opening in said at least one pipe and over a second vent opening in said head lift rig. 6. The system of claim 1, wherein said means for regulating air flow is a flap valve louver means for regulating a vent opening in each pipe. 7. The system of claim 6, wherein said at least one pipe comprises two pipes connected to said head lift rig. 8. The system of claim 6, further comprising a flow regulating means over a vent opening in said head lift rig, wherein, when said cooled air is circulating, said flow regulating means are held closed by pressure created by said circulating air, but when said cooled air is not circulated, said flow regulating means automatically fall open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig. 9. A cooling-system for a CEDM contained in a head lift rig of a nuclear reactor comprising: 10. The system of claim 9, wherein said louver is at least one self-actuating louver over a vent opening in either of said at least one pipe or said head lift rig. 11. The system of claim 10, further comprising a chamber within said head lift rig with exhaust openings for said forced cooled air, said chamber further comprising at least one louver which opens to admit cooler ambient air to said chamber when said cooled air is not circulated. 12. The system of claim 10, wherein said at least one louver is disposed over a vent opening in said at least one pipe. 13. The system of claim 10, wherein said at least one louver is disposed over a vent opening in said head lift rig. 14. The system of claim 10, wherein said at least one louver comprises at least two self-actuating louvers, one of which is disposed over a vent opening in said at least one pipe and one of which is disposed over a vent opening in said head lift rig. 15. The system of claim 9, wherein said louver is a flap valve louver regulating a vent opening in each pipe. 16. The system of claim 15, further comprising a chamber within said head lift rig with exhaust openings for said forced cooled air, said chamber further comprising at least one louver which opens to admit cooler ambient air to said chamber when said cooled air is not circulated. 17. The system of claim 15, wherein said at least one pipe comprises two pipes connected to said head lift rig. 18. The system of claim 15, further comprising a louver over a vent opening in said head lift rig, wherein, when said cooled air is circulating, said louver is held closed by pressure created by said circulating air, but when said cooled air is not circulated, said louver automatically falls open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig. 19. A method of cooling a CEDM contained in a head lift-rig of a nuclear reactor comprising: 20. The method of claim 19 wherein said louver is a self-actuating louver. 21. The method of claim 20, further comprising admitting cooler ambient air to a chamber within said head lift rig through at least one louver which opens when said cooled air is not circulated, said chamber having exhaust openings for said forced cooled air. 22. The method of claim 20, wherein said regulating comprises disposing said louver over a vent opening in said at least one pipe. 23. The method of claim 20, wherein said regulating comprises disposing said louver over a vent opening in said head lift rig. 24. The method of claim 20, wherein said regulating comprises using two self-actuating louvers, one of which is disposed over a vent opening in said at least one pipe and one of which is disposed over a vent opening in said head lift rig. 25. The method of claim 19 wherein said louver is a flap valve louver. 26. The method of claim 25, further comprising admitting cooler ambient air to a chamber within said head lift rig through at least one louver which opens when said cooled air is not circulated, said chamber having exhaust openings for said forced cooled air. 27. The method of claim 25, further comprising regulating a vent opening in said head lift rig with a self-actuating louver, wherein, when said cooled air is circulating, said louver is held closed by pressure created by said circulating air, but when said cooled air is not circulated, said louver automatically falls open to allow hot air from said head lift rig to exhaust and cooler ambient air to enter said head lift rig.