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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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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.
C J Caldwell-Nichols
Fusion Science and Technology | Volume 28 | Number 3 | October 1995 | Pages 827-832
Tritium Safety | Proceedings of the Fifth Topical Meeting on Tritium Technology in Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 | doi.org/10.13182/FST95-A30507
Articles are hosted by Taylor and Francis Online.
The dispersion of gases released to the environment at significant distances from the release point can be predicted using propriety computer codes. However during and after the Preliminary Tritium Experiment1,2 (PTE) at JET in 1991 comparatively high levels of tritium were measured around the buildings and also there was measurable uptake of tritium in the site cooling water. Better assessment of likely tritium concentrations resulting from discharges is required to determine if tritium would tend to concentrate close to the buildings due to the complex air flow patterns around them. Three methods have been considered, namely computational studies, wind tunnel testing and tracer release experiments. A graduated approach has been adopted as each method has its limitations, tracer experiments being particularly expensive. Computational studies indicate that under worst case conditions the maximum ground level concentrations (Bq/m·) per unit stack release rate (Bq/s) is 1.0E-4 but more generally less. The results are presented noting the limitations of this approach. To aid understanding and verify some of the results, wind tunnel tests on a model of the JET site have been undertaken and the results discussed. The need for tracer release studies is considered.