Currently, it is 60 years
Approx. 1-2 years, depending on the type of reactor and fuel.
The main disadvantage of fusion is that no scientists have been able to contain a fusion reaction long enough for there to be a net energy gain, but nuclear fission is already producing 11% of the worlds energy needs.The atomic bomb.
A steady state chain fission reaction is set up in the reactor, when just enough of the neutrons released in each fission is captured by other fissionable nuclei to keep the number of fissions occurring every second at a constant level. Thus the reactor power is held at a steady level. The reactor in terms of nuclear properties is then said to be "critical". As operation proceeds the U-235 gets used up, but this is counteracted to some extent by the production of plutonium from U-238, the plutonium also being fissionable. Eventually the reactor runs out of fissionable material and has to be refuelled, but this can be only at intervals of two years or so, between these refuelling outages the power output can be maintained continously.
The main consequence is the production of quantities of highly active fission products which would not occur naturally, and which will have to be carefully stored for thousands of years.
About 3 billion years ago, when U235 was much more common, it did. Look up the Oklo natural reactors in Africa for an example. There were probably other sites too.Manmade nuclear power reactors.Manmade nuclear weapons.
Nuclear fuel remains dangerously radioactive for thousands of years after it is no longer useful in a commercial reactor.
all reactor waste products with lifetimes over a few hundred years make excellent reactor fuel, they should all be recycled and reused in reactors. these are all transuranics, not fission products.
Oklo in Africa when the natural concentration of Uranium-235 was near 5% instead of the current 0.7%. This was about 3 billion years ago.
my cousin became a nuclear reactor engineer and he said it was about 12 years
Yes, all natural radiation (in the rocks) is a result of fission (but this fission is not part of a chain reaction like in a fission bomb). However, it is theoretically possible for natural processes to concentrate radioactive elements (uranium) to the extent where a natural nuclear fission reactor (a chain reaction like in a nuclear power plant) will form. Oklo in in Gabon is the only known location for this to have happened and consists of 16 sites at which self-sustaining nuclear fission reactions took place approximately 1.7 billion years ago.
About seventy years.
40 to 50 years
No. For 2 main reasons: 1) In a fission reaction the atoms split. Consequently, radioactive waste will be produced ( which is very expensive to store and keep them). 2) It will take billions of years for it to decay.
Approx. 1-2 years, depending on the type of reactor and fuel.
nuclear reactor on ship
Nuclear fission produces nuclear waste which has to be desposed off and because of the nuclear waste's long half-life it takes thousands of years before the waste becomes safe. Mining for U-238 is expensive and an enrichment process is required to turn U-238 to U-235 before it can be used in a nuclear reactor, this takes time and money and is another disadvantage.
You would probably be talking about nuclear fusion, but it is not available for use and probably won't be for another 50 years, so it's an academic matter. For useful power, fission reactors are the only technology we have, and they all use uranium and produce similar amounts of fission products