A nuclear reactor containment system comprising: a nuclear reactor; a container enclosing the nuclear reactor, the container including: a number of heat removal systems having an active state and an inactive state, wherein each of the number of heat removal systems dissipates heat from the container more efficiently in the active state than in the inactive state, wherein each of the number of heat removal systems is structured to switch from the inactive state to the active state based on a temperature of the container, and wherein the number of heat removal systems includes a first heat removal system including: fins disposed in an outer portion of the container and forming a plurality of cooling channels; and a plurality of air regulating mechanisms (70;80) structured to block air from flowing through the cooling channels when the first heat removal system is in the inactive state and to allow air to flow through the cooling channels when the first heat removal system is in the active state, characterized in that at least one of the air regulating mechanisms includes: a plate structured to be disposed over the one of the cooling channels to block airflow through the cooling channel; a pivot structured to support a first side of the plate; an electromagnetic element structured to support a second side of the plate via an electromagnetic force and being structured to its ability to support the second side of the plate via the electromagnetic force at a predetermined temperature, wherein when the first heat removal system is in the inactive state, the electromagnetic element supports the second side of the plate and the plate blocks airflow through the cooling channel, and wherein when the first heat removal system is in the active state, the electromagnetic element melts and allows the second side of the plate to fall into the cooling channel and allow airflow through the cooling channel. a nuclear reactor; a container enclosing the nuclear reactor, the container including: a number of heat removal systems having an active state and an inactive state, wherein each of the number of heat removal systems dissipates heat from the container more efficiently in the active state than in the inactive state, wherein each of the number of heat removal systems is structured to switch from the inactive state to the active state based on a temperature of the container, a number of heat removal systems having an active state and an inactive state, wherein each of the number of heat removal systems dissipates heat from the container more efficiently in the active state than in the inactive state, wherein each of the number of heat removal systems is structured to switch from the inactive state to the active state based on a temperature of the container, and wherein the number of heat removal systems includes a first heat removal system including: fins disposed in an outer portion of the container and forming a plurality of cooling channels; and a plurality of air regulating mechanisms (70;80) structured to block air from flowing through the cooling channels when the first heat removal system is in the inactive state and to allow air to flow through the cooling channels when the first heat removal system is in the active state, fins disposed in an outer portion of the container and forming a plurality of cooling channels; and a plurality of air regulating mechanisms (70;80) structured to block air from flowing through the cooling channels when the first heat removal system is in the inactive state and to allow air to flow through the cooling channels when the first heat removal system is in the active state, characterized in that at least one of the air regulating mechanisms includes: a plate structured to be disposed over the one of the cooling channels to block airflow through the cooling channel; a pivot structured to support a first side of the plate; an electromagnetic element structured to support a second side of the plate via an electromagnetic force and being structured to its ability to support the second side of the plate via the electromagnetic force at a predetermined temperature, wherein when the first heat removal system is in the inactive state, the electromagnetic element supports the second side of the plate and the plate blocks airflow through the cooling channel, and wherein when the first heat removal system is in the active state, the electromagnetic element melts and allows the second side of the plate to fall into the cooling channel and allow airflow through the cooling channel. a plate structured to be disposed over the one of the cooling channels to block airflow through the cooling channel; a pivot structured to support a first side of the plate; an electromagnetic element structured to support a second side of the plate via an electromagnetic force and being structured to its ability to support the second side of the plate via the electromagnetic force at a predetermined temperature, wherein when the first heat removal system is in the inactive state, the electromagnetic element supports the second side of the plate and the plate blocks airflow through the cooling channel, and wherein when the first heat removal system is in the active state, the electromagnetic element melts and allows the second side of the plate to fall into the cooling channel and allow airflow through the cooling channel.