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Passive nuclear safety is a design approach for safety features, implemented in a nuclear reactor, that does not require any active intervention on the part of the operator or electrical/electronic feedback in order to bring the reactor to a safe shutdown state, in the event of a particular type of emergency (usually overheating resulting from a loss of coolant or loss of coolant flow).
Under normal conditions, nuclear power plants receive power from generator. However, during an accident a plant may lose access to this power supply and thus may be required to generate its own power to supply its emergency systems. These electrical systems usually consist of diesel generators and batteries.
High air temperature and radiation from the core limit the time, measured in minutes, people can spend inside containment while the plant is operating at full power. In the event of a worst-case emergency, called a "design basis accident" in NRC regulations, the containment is designed to seal off and contain a meltdown .
If an operator recognizes a deteriorating condition, and knows an automatic safety system will activate, they are trained to pre-emptively activate the safety system. If the reactor is at power or ascending to power (i.e. if the reactor is supercritical; the control rods are withdrawn to the point where the reactor generates more neutrons than ...
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Amtrak said Tuesday afternoon a brush fire close to its tracks in the Bronx left trains in the area without power, forcing the agency to suspend the heavily used service connecting New York Penn ...
The category one hurricane, which made a direct hit on the city of Houston in Texas with 80 miles per hour winds at landfall, left more than two million people without power in the Houston area ...
One application of a specially shaped heating element is to increase the surface area of the heating element. A large surface area means the element can operate at a lower temperature and still deliver a large amount of heat. The lower temperature may make a heater safer. However, other safety measures can assure the safety of conventional heaters.