Abstract: A closed loop heat convection cooling system for nuclear reactors. The cooling system is formed outside the containment structure of the nuclear reactor and the structure of the cooling system prevents gas that is not in the closed circuit to approach the reactor within neutron radiation distance. The cooling systems has cooling assemblies that are housed in protective structures, which shield the cooling assemblies for projectile impact. Air inlet and outlet apertures are formed in the protective structures to cause outside air to be drawn into the protective structures to cool the cooling assemblies.

Abstract: A closed loop heat convection cooling system for nuclear reactors. The cooling system is formed outside the containment structure of the nuclear reactor and the structure of the cooling system prevents gas that is not in the closed circuit to approach the reactor within neutron radiation distance. The cooling systems has cooling assemblies that are housed in protective structures, which shield the cooling assemblies for projectile impact. Air inlet and outlet apertures are formed in the protective structures to cause outside air to be drawn into the protective structures to cool the cooling assemblies.

Abstract: A cooling system to remove decay heat removal from a nuclear core of a nuclear reactor when the nuclear reactor cesses to operate due to unforeseen conditions such as, for example, loss of electrical power to pumps circulating the primary coolant in the nuclear reactor. The cooling has a conduit structure that defines a sealed closed circuit through which a cooling fluid circulates through natural convection. In some embodiments, the cooling system of the present disclosure is always functioning. That is, the cooling system continuously extracts heat from the nuclear core. In these embodiments, the cooling system does not need to be actuated in any way when the nuclear reactor shuts down unexpectedly. In other embodiments, the cooling system can be turned on automatically upon loss of electrical power.