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Fuel loading process begins at Palisades
The Palisades nuclear power plant has drawn closer to restart, as plant staff began the process of loading fuel into the reactor vessel on Sunday morning.
The commencement of fuel loading places the Covert, Mich., facility in Mode 6—or the refueling stage—under the plant’s technical specifications, plant owner and operator Holtec International said in a news release. The Palisades reactor core consists of 204 fuel assemblies that include new fuel and partially used fuel from the plant’s most recent operating cycles. According to Holtec, the fuel loading is being conducted in accordance with plant procedures and technical specifications.
P. Pfahl, A. Chambon, J. Groth-Jensen, B. Lauritzen
Nuclear Science and Engineering | Volume 200 | Number 1 | March 2026 | Pages S39-S51
Review Article | doi.org/10.1080/00295639.2025.2494182
Articles are hosted by Taylor and Francis Online.
This paper presents Squirrel, a point-kinetics (PK) solver for calculating transients in a liquid-fueled nuclear reactor. Squirrel is developed within the Multiphysics Object Oriented Simulation Environment (MOOSE) framework. The modified PK solver accounts for reactivity changes due to changes in the spatial delayed neutron precursor (DNP) distribution by weighting the importance of the position of the delayed neutrons with the adjoint shape function of the reactor, expanding MOOSE PK capabilities to account for the spatial change in the DNP. Squirrel approximates the temperature feedback by weighting the impact of a local variation in temperature with the shape function to estimate the global effect on reactivity. In combination with the MOOSE internal Navier-Stokes module, Squirrel is tested on the National Center for Scientific Research benchmark. The results show that the solver can accurately calculate the change in reactivity induced by the movement of DNPs and the dynamic power change due to the temperature feedback. Squirrel is validated on a simple model of the Molten Salt Reactor Experiment. The results agree with the existing literature, showing that the chosen approach can capture the key aspects of reactor dynamics in a molten salt reactor under the assumption of a time-independent shape function.