{"id":18508,"date":"2018-09-01T09:19:53","date_gmt":"2018-09-01T09:19:53","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=18508"},"modified":"2023-02-04T17:26:56","modified_gmt":"2023-02-04T17:26:56","slug":"reactor-slagging-reactor-slag","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-power\/reactor-physics\/reactor-operation\/fuel-burnup\/reactor-slagging-reactor-slag\/","title":{"rendered":"Reactor Slagging – Reactor Slag"},"content":{"rendered":"
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As was written, an isotope long-lived or even stable is known as reactor slag<\/strong>. The accumulation<\/strong> of these parasitic absorbers is known as reactor slagging<\/strong> and determines the lifetime of nuclear fuel in a reactor. Their buildup causes (together with a decrease in fissile material) a continuous decrease in core reactivity.<\/p>\n

\"Table<\/a>Samarium 149 belongs to this group of isotopes, but its importance is so high that it is usually discussed separately. As can be seen from the table, there are numerous other fission products that, due to their concentration and thermal neutron absorption cross-section, have a poisoning effect on reactor operation. Other fission products with relatively high absorption cross-sections include 83<\/sup>Kr, 95<\/sup>Mo, 143<\/sup>Nd, 147<\/sup>Pm. Individually, they are of little consequence but taken together, and they have a significant effect. These are often characterized as lumped fission product poisons.<\/p>\n

As was written, for fuel burnup of 40 GWd\/tU, approximately 3 – 4% of the heavy nuclei are fissioned. The discharged fuel (spent nuclear fuel<\/strong>) still contains about 96% reusable material<\/strong>. It must be removed due to decreasing k<\/strong>inf<\/sub><\/strong> <\/a>of an assembly or in or in other words, and it must be removed due to:<\/p>\n