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 stations use the heat released by nuclear reactions to boil water to make steam. The type of nuclear reaction used is called nuclear fission. In nuclear fission: 1  A neutron collides with a uranium nucleus. 2  A uranium nucleus is large and unstable. 3  The uranium nucleus splits into two similar-sized smaller nuclei. 4  More neutrons are released. 5  These neutrons can then collide with more uranium nuclei.