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Congress receives NRC report on unusual events
The Nuclear Regulatory Commission has published its annual report to Congress for fiscal year 2023 on abnormal occurrences involving medical and industrial uses of radioactive material.
The report, which was announced by the NRC on May 3, is available on the NRC website.
K. Hirata, A. Matsumoto, T. Yamanishi, K. Okuno, Y. Naruse, I. Yamamoto
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 937-941
Material; Storage and Processing | doi.org/10.13182/FST92-A29871
Articles are hosted by Taylor and Francis Online.
Experimental study for separation of hydrogen isotopes has been performed by using a ‘cryogenic-wall’ thermal diffusion column refrigerated by liquid nitrogen. The column separated H-D system at total reflux and total recycle operational modes. The dependences of the separation factor on the column pressure and hot wire temperature were examined for the total reflux experiments. The optimum pressure observed was 30 kPa at 1273 K. The maximum separation factor at 473 K was larger than that at 1273 K since HD molecules were not produced on the hot wire by the isotope exchange reaction. The separation factor was exponentially proportional to the hot wire temperature. In the total recycle experiments, the separation factor was measured under a variety of flow rates, positions and compositions of the feed stream. The increase in the feed flow rate deteriorated the separation factor appreciably. The position and composition of the feed stream were also major parameters affecting the separation factor.