6. Glossary
Minor actinides
Isotopes formed in a reactor by successive neutron capture from fuel nuclei. These isotopes are mainly neptunium ( 237 Np), americium ( 241 Am, 243 Am) and curium ( 243 Cm, 244 Cm, 245 Cm).
Assembly
In the core of a water-cooled reactor, the fuel rods are grouped together in bundles, a structure comprising 264 rods (in the case of French PWRs) and loaded as a single unit into the reactor.
Cigéo
Industrial geological storage center
Nuclear fuel
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