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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.
Robert C. Axtmann, John, Bridgwater
Nuclear Science and Engineering | Volume 15 | Number 1 | January 1963 | Pages 81-89
Technical Paper | doi.org/10.13182/NSE63-A26266
Articles are hosted by Taylor and Francis Online.
Fast neutrons deposit energy in chemical systems by means of elastic scattering, inelastic scattering, and various charged particle reactions. For the particular case of 14.6 Mev neutrons and 1:1 solutions of liquid N2 and O2, the proportions by which the three classes of reactions contribute are, respectively, about 1:1:4. The initial linear energy transfer (ILET) in the same system is of the order of 20 ev/Å. Dosimetry in fast neutron radiation chemistry experiments may combine a quantitative consideration of each nuclear reaction with a measurement of the neutron flux. This method of dosimetry has been applied to experiments on the production of NO2 in 1:1 liquid N2 and O2 with the result that GNO2, the number of NO2 molecules formed per 100 ev deposited in the sample, was found equal to 0.5 ±0.1. This result is surprisingly close to that observed for irradiations by Co50 gamma rays and by electrons whose ILET is three orders of magnitude less than that for 14.6 Mev neutrons.
