核电站基础知识（Basic knowledge of nuclear power plants）.docVIP

核电站基础知识（Basic knowledge of nuclear power plants） This article is contributed by wangming710048 Ppt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Introduction to basic knowledge of nuclear power plants 1. nuclear fuel Natural or man-made some heavy nuclei (such as U - 235, Pu - 239) under the impact and release of fission neutron content less than 1% U - 235 of the amount of energy of natural uranium, it should be concentrated into ceramic UO U 235 content of more than 3% general PWR nuclear fuel the nuclear power plant using U 235 enrichment of 3% 2 as the fuel of nuclear fuel is made into pellets into the cladding 2011-3-17 2 2011-3-17 Three 2. fission reaction Fission reactions are reactions in which fission nuclei split into two intermediate masses and emit energy, including fission and spontaneous fission caused by neutron bombardment. What is significant is the reaction of a heavy nucleus to fission when bombarding some fissionable nuclei with neutrons. During fission, a large amount of energy is released, accompanied by the release of a number of secondary neutrons, which is the most important nuclear reaction. 2011-3-17 4 Reaction to the nuclear fission reaction type, generally available to describe: U+n, X1+X2+, n+E in U V nuclear, n said X1 and X2 neutron, representing two fission fragments of nuclear fission, V said average number of secondary neutrons emitted by each time, E said the release of energy per fission. 2011-3-17 Five Three Chain fission reaction chain fission reaction 2011-3-17 Six 4. reactor A nuclear reactor is a device for realizing nuclear controlled chain fission reactions. The reactor was first built in the United States in 1942. In the early 50s, the United States and the Soviet Union successively built nuclear power plants. Since then, reactors have been widely developed and applied in many countries and regions. 2011-3-17 Seven 2011-3