Sometimes other signs and symptoms precede sudden cardiac arrest. These may include fatigue, fainting, blackouts, dizziness, chest pain, shortness of breath, weakness, palpitations or vomiting. But sudden cardiac arrest often occurs with no warning.
In the core of nuclear reactors, the fission of uranium atoms releases energy that heats water to about 520 degrees Farenheit. This hot water is then used to spin turbines that are connected to generators, producing electricity.
Nuclear power plants use nuclear fission to generate power. The nuclei of uranium atoms, as well as the nuclei of other large atoms, can undergo nuclear fission naturally. The first nuclear fission reaction discovered involved uranium-235. Nuclear power plants use uranium-235 nucleus to undergo fission by hitting them with neutrons, as shown by the model in the following diagram. The figure represents the process of nuclear fission when a neutron strikes a uranium-235 nucleus.