Spectral shift operated smAHTR to improve cycle length and discharge burnup simultaneously
Mehta, Vedant Kiritkumar
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Fluoride High Temperature Reactors (FHRs) are envisioned to be next generation reactors due to their inherent safety design characteristics and high efficiency from their use of salt-based coolants. FHRs use TRistructural-Isotropic (TRISO) fuel for its benefits of encapturing fission gases and fission products in its layers. One of the main disadvantages of using TRISO fuel is that its fabrication costs are a lot higher (in range of $5,000-$30,000 per 𝑘𝑔 Uranium) compared to current pellet-based fuel ($300 per 𝑘𝑔 Uranium). In this study, we propose and develop a spectral shift method to operate this type of reactors. This spectral shift method is based on varying neutron energy spectrum. As a result, both cycle length and discharge burnup are improved simultaneously while eliminating the need of burnable poison.