Article Dans Une Revue
Annals of Nuclear Energy
Année : 2024
Résumé
The present work is concerned with the problem of determining the reactivity of an assembly from which an unknown number of fuel pins are removed at random locations. Because it is usually designed to be under-moderated, the reactivity of an incomplete assembly will pass by an optimum when the number and position of the missing rods vary. Estimating this maximal reactivity is paramount for criticality safety but is difficult to achieve in practice, because of a prohibitive combinatorial factor, that forbids any direct approach of the problem. It is shown that the maximum reactivity of an isolated PWR assembly with missing fuel rods can be estimated with very few calls on time expensive computer simulations. Drawing a parallel with the field of neutron transport in random geometries, it is indeed shown that the problem can be reduced to an optimum search in an appropriate bounded, bi-dimensional space.
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https://irsn.hal.science/irsn-04346500
Soumis le : vendredi 15 décembre 2023-10:25:04
Dernière modification le : vendredi 1 mars 2024-19:29:51
Dates et versions
Licence
- HAL Id : irsn-04346500 , version 1
- DOI : 10.1016/j.anucene.2023.110273
Citer
Benjamin Dechenaux, Thomas Delcambre, Fausto Malvagi. Criticality safety of fuel assemblies with missing fuel rods. Annals of Nuclear Energy, 2024, 198, pp.110273. ⟨10.1016/j.anucene.2023.110273⟩. ⟨irsn-04346500⟩
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