Preliminary tritium safety analysis and problems with obtaining public consent to deuterium plasma experiments in the LHD
Preliminary tritium safety analysis and problems with obtaining public consent to deuterium plasma experiments in the LHD
复制标题
初步氚安全性分析以及 LHD 中氘等离子体实验获得公众同意的问题
DOI：
10.13182/fst02-a22668
复制
发表时间：
2002
影响因子：
0.9
通讯作者：
O. Motojima
中科院分区：
文献类型：
--
作者：
T. Uda;S. Tanahashi;K. Nishimura;K. Shinotsuka;O. Motojima
大型螺旋装置（LHD）是目前世界上最大的超导日光管型装置，它有两个连续的螺旋线圈。1998年3月，在LHD中进行了第一次等离子体发射，此后，进行了等离子体约束实验。作为未来的计划，研究人员已经提出了一个DD等离子体实验，这是一个实验的氘（D）束注入到D等离子体。开展这样的实验对于磁聚变研究的进展至关重要。在DD等离子体实验中，由于核聚变反应而产生氚和中子。氚的年最大量约为370 GBq。我们计划以99%以上的效率去除氚。我们进行了氚安全分析，发现对于LHD设施周围的居民来说，氚的年暴露剂量低于1×10−7 mSv，这是废气和废液释放到环境中的结果。然而，要进行DD实验，我们需要获得公众的同意，这并不容易。国家核聚变科学研究所向公众开放，我们在核聚变科学研究所尽一切努力向公众和市政府传播关于辐射安全的信息。本报告显示了初步安全分析的结果和在获得公众同意进行今后的LHD试验方面存在的问题。
ABSTRACT The Large Helical Device (LHD) is the largest super-conducting heliotron type device with two continuous helical winding coils. The first plasma shot in the LHD was carried out in March, 1998, and since then, plasma confinement experiments have been performed. As a future plan, a DD plasma experiment, which is an experiment with deuterium (D) beam injection into D plasma, has been proposed by researchers. Conducting such an experiment is essential for the progress in magnetic fusion research. In DD plasma experiments, tritium and neutrons are generated as a result of nuclear fusion reaction. The maximum annual amount of tritium is about 370 GBq. We are planning to remove tritium with an efficiency greater than 99 %. We conducted a tritium safety analysis and found that for inhabitants around the LHD facility, the annual dose of exposure to tritium is less than 1×10−7 mSv, which is a result of off gases and effluent liquid being released into the environment. However, to perform DD experiments, we need to obtain public consent, which is not easy. The National Research Institute for Fusion Science (NIFS) is open to the public, and we at the NIFS make every effort to communicate to the public and the municipal governments information on radiation safety. The present report shows results of preliminary safety analysis and problems with obtaining public consent to future experiments of the LHD.