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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.
Sergey V. Shchepetov, Aleksandr B. Kuznetsov, Dmitrii Yu. Sychugov
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 455-458
Magnetohydrodynamic Equilibrium And Stability | doi.org/10.13182/FST95-A11947127
Articles are hosted by Taylor and Francis Online.
Here we present the principle of operation of fast algorithm based on the selection of few toroidal harmonics which visibly affect the plasma boundary and discuss the influence of the plasma induced magnetic fields on the shape and sizes of plasma boundary. The existing moderate pressure profile dependence increases as one passes from the shearless system to the system with large shear. Traditional methods for combating plasma induced changes in magnetic configurations by external axisymmetric magnetic fields are analyzed. It is shown that the quadrupole field can not only restore the rotational transform profile but usually visibly destroys external magnetic surfaces. An ill-posed problem of MHD stellarator equilibria identification from the external measurements is investigated and the possibility to restore the plasma profiles in the frame of a two-parametric set of functions using the system of local probes is discussed.
In the second part of the work we generalize the well-known method of flux coordinates for investigation of plasmas with nested magnetic surfaces to compute large-scale magnetic islands. The method for computing structures with several magnetic axes using non-single valued flux coordinates is discussed.