Juan Luis García MartínezCarmen Gª-Calvo LópezEnrique Gª-Tenorio Corcuera2ºC-D
Nuclear energy Nuclear energy is the energy released in nuclear reactions. However, we also refer to nuclear energy as the use of that energy for other purposes such as providing electrical, mechanical and thermal energy from nuclear reactions.
What is nuclear energy? Nuclear energy is a physical-chemical process in which a lot of energy is released(called nuclear energy). We will explain the process caused in nuclear reactions in which this nuclear energy is obtained.
We analyze the two main methodsof obtaining nuclear energy: Nuclear fission Nuclear fusion
Nuclear fission Nuclear fission is one of the two possible reactions that take place when we work with nuclear energy. We called nuclear fission the division of the nucleus of an atom. The nucleus becomes many fragments with a mass almost equal to half the original mass plus two or three neutrons.
Nuclear fusion A clear example is seen in Nuclear fusion is a nuclear the solar energy that reaction in which two nuclei comes from the fusion of of light atoms combine to hydrogen form one heavier nuclei, generating helium nucleus, releasing a and releasing a large large amount of amount of energy. energy.
Advantage Distribution of nuclear energy in Europe A third of the energy Findlandia generated in Europe Bulgaria comes from nuclear Suiza Distribution energy, this implies that Armenia of nuclear Ucrania energy in emit 700 million tons of Europe Eslovaquia CO2 and other Francia contaminants generated 0 50 100 from burning fossil fuels.
Advantage Fossil fuels will be exhausted in a not too distant future. One of the great advantages of using nuclear energy is the relationship between the amount of fuel used and the energy obtained. Years Here is a graphic which shows how Petrol much time Coal will non-renewable Uranium Years last. Coal 0 100 200 300
Advantage As an alternative to fossil fuels as carbon or oil, we would avoid the problem of so-called global warming. It will improve the quality of air we breathe.
Disadvantages The main disadvantage is that the responsibility falls on people. Irresponsible decisions can lead to accidents at nuclear plants. One of the main problems is the generation of nuclear waste and the difficulty to manage as it takes many years to lose its radioactivity and dangerous. Let’s see a real example of how irresponsible decisions can cause a disaster.
The nuclear accident of Chernobyl. On the 26th April 1986, the reactor number four of the nuclear plant of Chernobyl suffer the most nuclear accident of the history. The consequences of the disaster affecting an area of nearly 5 million inhabitants, contaminating 23% of the surface of neighboring Belarus, parts of Russia and Ukraine and parts of Poland, Czech Republic and Germany.
Disadvantages Nuclear fusion is unfeasible because of the difficulty of heating the gas to such high temperatures and to maintain a sufficient number of cores for a time sufficient to obtain energy and retaining the gas is highly expensive.
Important nuclear plants in Spain. The most important are: Sta. Mª de Garoña, Trillo, José Cabrera, Cofrentes, Ascó I-II, Almaraz I- II, Vandellós II.
How does a nuclear plant works? First, in the nuclear reactor, nuclear fission occurs. This reaction generates a lot of heat used to heat water. The water transformed into high-temperature steam, reaches the turbine which rotates. It transforms heat into kinetic energy. The turbine is connected to an electric generator which can transform kinetic energy into electric energy. The steam exits the turbine and, as it is still hot, it must be cool. Whe it leaves the turbine, it reaches a condensation tank and becomes liquid, so that we can put it back in the circuit.
Bibliography energia-nuclear.net/ es.wikipedia.org/wiki/Energía_nuclear http://www.inza.com/ainoa/nuclear2.swf http://energia- nuclear.net/es/como_funciona_la_energia_nuclear.ht ml