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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.
Mingfu He, Youho Lee (Univ of New Mexico)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 449-459
The critical heat flux (CHF) sets the upper limit of efficient heat removal for pool boiling. Microstructures fabricated on a heat transfer substrate can effectively increase the limit of heat removal and delay the boiling crisis. The exact physics mechanisms behind microstructure enhancement still remain ambiguous and CHF prediction on microstructured surfaces is not well resolved even if numerous related studies and experiments have been performed. In this study, the deep belief network (DBN) is proposed to predict CHF and study parametric trends of CHF by collecting relevant CHF datasets from published papers. Performance comparisons with other four common machine learning techniques and three modified Zuber models accounting for the effects of microstructures are conducted for exploring complicated and nonlinear relation between CHF and microstructures. Different from the training process of other regression modelling problems, a special model convergence, which is defined in Subsection 3.1, is required to be incorporated into the CHF model of DBN for exhibiting accurate parametric trends of CHF and improving the prediction accuracy. Numerical results demonstrate that DBN can achieve the best performance of CHF prediction in terms of prediction accuracy. The presented methodology provides new insights for CHF modelling in pool boiling enhanced by microstructures.