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Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
A. Y. Ying, H. Huang, M. A. Abdou, L. Zi
Fusion Science and Technology | Volume 39 | Number 2 | March 2001 | Pages 617-623
Fusion Materials | doi.org/10.13182/FST01-A11963306
Articles are hosted by Taylor and Francis Online.
In this paper, a thermomechanical interaction of a ceramic breeder pebble bed and structural plate is studied based on a recently developed discrete numerical simulation code. The calculations take into account the coupling effect between structural wall deformation and pebble bed deformation, which greatly increases the computing time and complicates the computational procedures in determining the particle-wall contact characteristics. Specifically, the model is applied to a lithium orthosilicate packed bed for the evaluation of the deformation of a circular plate due to bed thermal expansion, while the results are compared with SCATOLA's experimental data. Numerical results using a fixed boundary condition show reasonable agreement with the experimental data. In addition, numerical simulations confirm an irreversible plate deformation after a thermal cycle run as observed in the experiments, although these experimentally observed deformations are larger than that of the numerical estimations. Moreover, numerical results of contact forces at contact points provide information concerning the mechanical integrity of the bed at a moderately high temperature.