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Some nuclear power reactors work with low enriched uranium; CANDU reactors work with natural uranium.

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โˆ™ 2011-08-21 17:05:46
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Nuclear fission reactions involve the

Groups are organized by the number of electrons that are found in their outer shell

Nitrogen has an atomic mass of 14 and an atomic number of 7 so the number of neutrons must be

When one element changes into another the number of changes and the process is called

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Q: Does uranium need to be enriched in order to be used in a nuclear reactor?
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A radioactive fuel which can be used in power stations?

Usually, Uranium-235. Sometimes, in special applications, Plutonium-239. Note that naturally occurring Uranium is more than 99% Uranium-238, and less than 1% Uranium-235. In order to build an effective reactor, the Uranium is enriched, typically to around 5% Uranium-235.


What type of nuclear reaction takes place in a nuclear power plant?

The purpose of a nuclear reactor is to create and sustain a fission chain reaction in order to produce heat to make steam to drive turbines and produce electrical power (extremely simplified explanation). A fission chain reaction is the interaction of neutrons with fissile materials (elements that can be fissioned). Some enriched fuel (such as uranium-238) is introduced into the reactor core. It produces neutrons as radiation. If more fissile material is present ("fuel" such as uranium-235), that interaction repeats to make more neutrons, and so on. A nuclear reactor is designed to sustain a fission chain reaction and control the rate at which that reaction occurs.


What part of a nuclear reactor is designed to absorb neutrons?

The control rods are used as a variable absorber, otherwise the reactor is designed not to absorb more neutrons than can be helped, in order to reduce the amount of enriched fuel needed. Around the outside of the reactor will be a concrete shield to protect operating staff.


What material is needed in nuclear power stations?

Most nuclear power stations run on enriched uranium in one form or another, either as uranium compounds, or as uranium metal. Some use other fuels, but all plants based on nuclear fission use fuels based either thorium or uranium, which are the only fertile element found in any abundance in nature. Fusion plants are envisioned, but none has been designed so far; these would use isotopes of hydrogen for fuel. To get enriched uranium, ore has to be mined, and the uranium in it extracted and refined. The resulting uranium is usually about 99.28% made up of 238U, and 0.71% of 235U. In order to be used in most conventional nuclear plants the 235U has to be increased to 3% to 5% of the total. There are various ways of doing this, but the commonest seems to be to react the uranium, making UFl6, uranium hexafluoride, which is a gas, and concentrate the lighter portions in a centrifuge at very high speeds. The enriched UFl6 is then reacted to form the form of uranium needed for the particular design of the power plant. In most plants, the uranium is packaged in rods, enclosed in sheathing of some special material such as zirconium. These are assembled in bundles that can be put into and taken out of the reactor relatively easily. There are other ways of fueling nuclear reactors. But this is the most common.


Does uranium need to be changed in order to be used?

Yes, the nuclear fuel from a nuclear reactor must be replaced at some intervals, because the fuel can be poisoned with neutron absorbers and the clad can become fragile and unsure; the "burned" fuel is recycled.


What does uranium bond with?

Uranium is a metal, and it will bond with a number of different other elements to create compounds just like many (most) other metals. It has oxidation states of +3, +4, +5 and +6. Just one example of a uranium compound is uranium fluoride (UF6), which is the compound of uranium which is made in preparation for centrifuging in order to effect some isotopic separation to enrich the uranium. Then the enriched product can be used as nuclear fuel, or in making a nuclear weapon, perhaps. Wikipedia has more information, and a link to their post can be found below.


What does uranium bond?

Uranium is a metal, and it will bond with a number of different other elements to create compounds just like many (most) other metals. It has oxidation states of +3, +4, +5 and +6. Just one example of a uranium compound is uranium fluoride (UF6), which is the compound of uranium which is made in preparation for centrifuging in order to effect some isotopic separation to enrich the uranium. Then the enriched product can be used as nuclear fuel, or in making a nuclear weapon, perhaps. Wikipedia has more information, and a link to their post can be found below.


What is the amount of uranium used to run a nuclear reaction?

A typical PWR has fuel assemblies of 200-300 rods each, and a large reactor would have about 150-250 such assemblies with 80-100 tonnes of uranium in all. It produces electric power in the order of 900 to 1500 MW.


How much kg of uranium is required to become critical mass?

There is no single quantity, it depends on many factors some are:enrichment levelpresence/absence of moderatortype of moderatorpresence/absence of reflectorthickness of reflectortype of reflectorpresence/absence of absorbertype of absorberhas the uranium been compressed beyond standard densityetc.For some general order of magnitude values:in a typical water moderated reactor, the critical mass of the 3% enriched uranium is usually several tonsin a typical atomic bomb with a depleted uranium tamper/reflector, the critical mass of the 93.5% enriched uranium is 15 to 20 kg depending mostly on the thickness of the tamper/reflector


If you wanted to slow down the chain reaction in a nuclear reactor would you remove or insert the control rods?

In order to slow down the chain reaction in a nuclear reactor, i.e. to reduce KEff, you would insert the control rods.


What reaction must uranium undergo in order to release energy?

Nuclear fission with thermal neutrons


What is the function of a nuclear reactor?

Usually to provide thermal power in order to produce electricity, sometimes to produce radioisotopes

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