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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.
P. H. Kier
Nuclear Science and Engineering | Volume 26 | Number 2 | October 1966 | Pages 230-236
Technical Paper | doi.org/10.13182/NSE66-A28165
Articles are hosted by Taylor and Francis Online.
A method of calculating resonance absorption in a rod in a two-region circularized cell is developed. The method uses space-and lethargy-dependent neutron sources and, thus, includes overlapping and interference effects. An energy range of interest is divided into extremely narrow intervals of equal lethargy width. For each interval, the source distribution in each region is taken to be a three-term polynomial. By using this form for the source and the assumption that neutrons enter the rod isotropically, we obtain the reaction rates and the flux distribution for the interval. The reaction rates are used to obtain resonance integrals; the flux distribution is used to get the source distribution for lower energies. Calculations of the errors introduced into the resonance integral of the two closely spaced 232Th resonances by the assumption of flat sources are given, as well as calculations of the effects of interference in UO2-ThO2 mixtures, which lie within the errors of the experimental results obtained by Foell.
