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Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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April 3–5, 2025
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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.
Shigeo Numata, Yasuhiko Fujii, Makoto Okamoto
Fusion Science and Technology | Volume 26 | Number 3 | November 1994 | Pages 248-254
Technical Paper | Safety/Environmental Aspect | doi.org/10.13182/FST94-A30328
Articles are hosted by Taylor and Francis Online.
The catalytic conversion of tritium gas (HT) to tritiated water (HTO) by cement materials is studied by using mortars made of ordinary Portland cement and Portland blast furnace slag cement exposed to HT at concentrations of 3 to 6 × 109 Bq/m3 in air. Within the experimental conditions, no significant difference in the conversion rate is found between the two types of cement. Extended experiments are carried out by using mortars made of ordinary Portland cement to evaluate the catalytic effect of cement materials. The experimental results are explained by a model that assumes that the conversion is dependent on the geometric surface area of the mortars. The mortar surface is found to play an important role in the conversion. The capacity coefficient in mass transfer on the mortar surface and its standard deviation are found to be (4.3 ± 1.4) × 10−11 m/s. The mechanism of the conversion reaction is uncertain in this study. The conversion rate of the catalytic effect by the cement materials is compared with the conversion rate by the radioactive decay of T2. The HTO produced by the conversion is retained in the pore water of the cement materials.
