Thorium Reactors May Dispose of Enormous Amounts of Weapons-Grade Plutonium While Yielding Power, Thermal Energy and Desalinated Water
Scientists from the School of Nuclear Science & Engineering of Tomsk Polytechnic University are developing a technology enabling the creation of high-temperature gas-cool low-power reactors with thorium fuel. TPU scientists propose to burn weapons-grade plutonium in these units, converting it into power and thermal energy. Thermal energy generated at thorium reactors may be used in hydrogen industrial production. The technology also makes it possible to desalinate water.
The results of the study were published in Annals of Nuclear Energy.
Thorium reactors provide for their application in areas where there are no large water bodies and rivers, the presence of which is an obligatory condition to build a classical reactor. For example, they can be used in arid areas, as well as in remote areas of Siberia and the Arctic.
Associate Professor Sergey Bedenko from the School of Nuclear Science & Engineering tells: ‘As a rule, a nuclear power plant is constructed on the riverside. Water is taken from the river and used in the active zone of the reactor for cooling. In thorium reactors, helium is applied, as well as carbon dioxide (CO2) or hydrogen, instead of water. Thus, water is not required.’
The mixture of thorium and weapons-grade plutonium is the fuel for the new kind of reactors.
Sergey Bedenko continues: ‘Large amounts of weapons-grade plutonium were accumulated in the Soviet era. The cost for storing this fuel is enormous, and it needs to be disposed of. In the US, it is chemically processed and burned, and in Russia, it is burned in the reactors. However, some amount of plutonium still remains, and it needs to be disposed of in radioactive waste landfills. Our technology improves this drawback since it allows burning 97% of weapons-grade plutonium. When all weapons-grade plutonium is disposed of, it will be possible to use uranium-235 or uranium-233 in thorium reactors.’Ass. Prof. Sergey Bedenko demonstrates a simulation model of high-temperature gas-cooled reactors with thorium fuel.
Credit : Tomsk Polytechnic University
Sergey Bedenko summarizes: ‘The main advantage of such plants will be their multi-functionality. Firstly, we efficiently dispose of one of the most dangerous radioactive fuels in thorium reactors, secondly, we generate power and heat, thirdly, with its help, it will be possible to develop industrial hydrogen production.’
The authors of the study inform that the advantage of such reactors is their higher level of security in comparison with traditional designs, enhanced efficiency (up to 40-50%), absence of phase transitions of the coolant, increased corrosion resistance of working surfaces, possibility of using different fuels and their overload in operation, and simplified management of spent nuclear fuel.
Thorium fuel can be used both in thorium reactors and widely spread VVER-1000 reactors. The scientists expect these reactors to function at least 10-20 years, and when this fuel is spent, the core reactor may either be reloaded or disposed of.
In addition, water can be desalinated at thorium reactors.Contacts and sources:
Kristina Nabokova
Tomsk Polytechnic University
Source: http://www.ineffableisland.com/2018/01/thorium-reactors-may-dispose-of.html
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BS again, what is the temperature of the nuclear arc? How many more spent nuclear fuel rods are going to pollute. They have cold fusion and they had better use it. We don’t need more hidden accidents because they can’t contain heat like the surface of the sun.