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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.
P.A. Davis, R.J. Cornett, R.W.D. Killey, M.J. Wood, W.J.G. Workman
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 651-658
Safety and Measurement (Monitoring) | doi.org/10.13182/FST92-A29821
Articles are hosted by Taylor and Francis Online.
An accidental release of HTO to the atmosphere from a reactor at the Chalk River Laboratories was assessed in a timely and efficient manner using a combination of predictive modelling and environmental sampling. A simple Gaussian plume model performed well in predicting the concentration of HTO in air. Doses to workers and to members of the public were well below acceptable levels at all times during the incident. The release was turned to advantage to study tritium behaviour in the winter environment. HTO concentrations were measured in air, falling snow, vegetation and the snowpack at many locations during and after the release. The rate of HTO deposition to snow is greatly enhanced when snow is falling. The rate of new snow accumulation exceeded the rate of HTO diffusion in snow, so that the snowpack retained essentially all of the tritium deposited to it until spring melt occurred. Snow core data were therefore used as a surrogate for air concentrations to study the dispersion of the airborne plume, which was strongly affected by the topography of the Ottawa River Valley.