Uranium-plutonium breeder systems Jan Willem Storm van Leeuwen Independent consultant member of the Nuclear Consulting Group October 2019
[email protected] Note In this document the references are coded by Q-numbers (e.g. Q6). Each reference has a unique number in this coding system, which is consistently used throughout all publications by the author. In the list at the back of the document the references are sorted by Q-number. The resulting sequence is not necessarily the same order in which the references appear in the text. m01breeders20190922 1 1 October 2019 Contents Introduction Burner reactors Breeder cycle Breeder reactor Reprocessing Fuel fabrication The breeding system Main parameters Plutonium recycling Difficulties Technical hurdles of the breeding system Breeder reactor Process losses Reprocessing Fuel fabrication Uranium recycling Feasibility of the U-Pu breeder system LMFBR as transmuter New names, no new concepts Logistic hurdles Plutonium availability Proliferation and terrorisk risks Safeguards Security issues of the breeder and P&T cycles Thorium fuel cycle Conclusions References TABLES Table 1 Desirable properties of the breeding cycle Table 2 Composition of plutonium generated in an LWR FIGURES Figure 1 Reactor types Figure 2 Distribution world power reactor types Figure 3 Outline of the breeder sytem Figure 4 Symplified outline of reprocessing Figure 5 Partitioning and transmutation (P&T) system m01breeders20190922 2 1 October 2019 Introduction The only fissile nuclide in nature is uranium-235, accounting for 0.7% of the atoms in natural uranium. The remaining 99.3% consists of uranium-238 atoms and traces of uranium-234 atoms, which are not fissile.