Patent Number: 
Section: claims

1. A condensation chamber cooling system, comprising: a condensation chamber for a boiling water reactor, said condensation chamber having a maximum fill line and a minimum fill line; at least one heat exchanger disposed outside said condensation chamber; an elongated cooling module being disposed in said condensation chamber, said condensation chamber having an upper region with an evaporation space; said cooing module being disposed in said condensation chamber with said evaporation space being located above said maximum filling level of said condensation chamber; at least one riser pipe and one downpipe, each of said riser pipe and said downpipe having an upper end and a lower end and, each of said respective upper ends issuing into said evaporation space, and each of said respective lower ends extending in said condensation chamber below said minimum filling level; a first pressure line connecting said evaporation space to said heat exchanger; and a second pressure line connecting said heat exchanger to said condensation chamber; said condensation chamber; said pressure lines, said cooling module, and said heat exchanger forming a passive closed cooling circuit. 2. The condensation chamber cooling system according to claim 1, wherein said downpipe is nested within said riser pipe. 3. The condensation chamber cooling system according to claim 1, wherein said heat exchanger includes an evaporation condenser. 4. The condensation chamber cooling system according to claim 1, further comprising a blow-off line issuing below said minimum filling level in said condensation chamber. 5. The condensation chamber cooling system according to claim 1, further comprising a vacuum pump acting upon said cooling circuit. 6. The condensation chamber cooling system according to claim 1, wherein said at least one heat exchanger is disposed geodetically above said condensation chamber. 7. The condensation chamber cooling system according to claim 1, wherein said minimum filling level corresponds at least approximately to said maximum filling level. 8. The condensation chamber cooling system according to claim 1, further comprising an additional active cooling circuit connected to said condensation chamber, said additional active cooling circuit being provided for discharging waste heat from said condensation chamber. 9. The condensation chamber cooling system according to claim 1, further comprising a pumping system connected to said condensation chamber, said pumping system providing return of water located in said condensation chamber into the boiling water reactor. 10. The condensation chamber cooling system according to claim 1, wherein said heat exchanger is provided for discharging waste heat into a surrounding.