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It says that the minimum amount of pure uranium(U-235) needed to cause a chain reaction is about 50 kg. It is called the Super Critical Mass. But because pure uranium is rare or dificult to make, usually the scientists will need more then 50 kg.

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15y ago
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12y ago

The site at the link below says it will take 74kg of Uranium per day to power a 1000 MW power station.

Using m = E/c2, only 0.00096 kg is completely converted to energy.

m = 1000e6 * 24 * 3600 / (3e8)2

The new Chinese nuclear breakthrough should use about 60 times less Uranium to generate the same amount of energy.

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15y ago

To figure out how much uranium is needed, we will use the popular equation e = mc2. First, we need to convert 1 kWh into joules for use in the equation. It turns out that 1kWh is the equivalent of 3,600,000 joules! We also need the speed of light, which is exactly 299,792,458 m/s. We can now substitute these values into the equation:

# e = mc2 # 3,600,000 = m * 299,792,4582 # 3,600,000 = m * 89875517873681764 # 3,600,000 / 89875517873681764 = m # m ≈ 4.0055402 * 10-11 kg That means that 4.0055402 * 10-11 kg of uranium are required to create 1 kWh of electricity.

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14y ago

Roughly 75 tonnes (75,000 kg)

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Q: How much uranium is needed to produced 1kw electricity?
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Is thorium better than uranium?

Yes, we can get more electricity from thorium, if you are asking about the supply. When 232Th is used in a nuclear reactor, it is bred to become 233U. This isotope of uranium has about as much energy available as 235U, so the amount of energy per fission event is about the same for thorium as it is for uranium. Aside from that, however, there are important differences. Thorium does not need to be enriched, so all of it can be used. The amount of thorium we have is a multiple of the amount of uranium. The combination means that, where we only have a few decades supply of uranium, we have enough thorium to last thousands of years.


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Its really hard to say, the only nuclear bomb that might contain that much uranium (probably as depleted uranium) would be a hydrogen fusion bomb with a uranium tamper.Depending on many design features, it would probably weigh a bit under 2 tons and have a yield somewhere between 2 megatons and 20 megatons, most of that produced by fission of the uranium tamper.NO nuclear bomb could ever contain that much weapons grade uranium, as it would be so far beyond critical that it would simply melt in the factory as it was being assembled and kill anyone nearby with neutron and gamma radiation.

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