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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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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.
H. Oka, M. Nishikawa, T. Takeishi, J. Yamaguchi, M. Nishi, T. Hayashi, K. Kobayashi
Fusion Science and Technology | Volume 41 | Number 3 | May 2002 | Pages 658-662
Safety and Safety System | Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 | doi.org/10.13182/FST02-A22669
Articles are hosted by Taylor and Francis Online.
The system effect of tritium arises from the interaction of tritium in the gas phase with water on the surface of piping materials. It has been reported that the system effect can be quantified by applying the serial reactor model to the piping system, connection of perfect mixed flow type reactors and plug flow type reactors, and that adsorption and isotope exchange reactions play the main roles in the trapping of tritium. In this study we made a calculation code of the system effect using the serial reactor model where 304SS, aluminum, copper or graphite is used for the piping material. Comparison of the calculated value using this code gives the good agreement with the experimental data taken at the cooperative experiment using a box made of stainless steel type 304 in Tritium Processing Laboratory in JAERI and that is called as the Caisson. It is observed that the isotope exchange reaction between tritiated water in the air and surface water on the 304SS surface controls the tritium trapping performance at the room temperature although HTO/HT ratio is around 0.1 in this experiment.
