{"title":"Development and application of the neutron standards","authors":"Tetsuro Matsumoto","doi":"10.3327/JAESJB.63.6_480","DOIUrl":"https://doi.org/10.3327/JAESJB.63.6_480","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"212 1","pages":"480-484"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83345307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Statement of the AESJ Ethics Committee on the incident of receipt of cash-and-gifts committed by KEPCO","authors":"Shin-etsu Sugawara","doi":"10.3327/jaesjb.63.1_82","DOIUrl":"https://doi.org/10.3327/jaesjb.63.1_82","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82864163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Research and Development of Processing and Disposal of Solid Radioactive Waste","authors":"H. Yoshikawa","doi":"10.3327/JAESJB.63.6_471","DOIUrl":"https://doi.org/10.3327/JAESJB.63.6_471","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87044536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"R&D Activities on Decommissioning of Fukushima Daiichi Nuclear Power Station","authors":"Masaaki Matsumoto","doi":"10.3327/JAESJB.63.6_468","DOIUrl":"https://doi.org/10.3327/JAESJB.63.6_468","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89650290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A dry method is one of practical methods for decommissioning the TEPCO's Fukushima Daiichi nuclear power station. Japan Atomic Energy Agency (JAEA) has been evaluating the air cooling performance of the fuel debris by using the JUPITER code based on an incompressible fluid model and the CityLBM code based on the lattice Boltzmann method (LBM). However, these codes were based on a uniform Cartesian grid system, and required large computational time and cost to capture complicated debris structures and multi-scale flows at the actual reactor scale. The adaptive mesh refinement (AMR) method is one of the key techniques to accelerate multiscale simulations. We develop an AMR version of the CityLBM code on GPU based supercomputers and apply it to thermal-hydrodynamics problems. The proposed method is validated against free convective heat transfer experiments at JAEA. Thanks to the AMR method, grid resolution is optimized near the walls where velocity and temperature gradients are large, and the temperature distribution agrees with the experimental data using half the number of grid points. It is also shown that the AMR based CityLBM code on 4 NVIDIA TESLA V100 GPUs gives 6.7x speedup of the time to solution compared with the JUPITER code on 36 Intel Xeon E5-2680v3 CPUs. The results show that the AMR based LBM is promising for accelerating extreme scale thermal convective simulations.
干法是东京电力公司福岛第一核电站退役的实用方法之一。日本原子能机构(JAEA)一直在使用基于不可压缩流体模型的JUPITER代码和基于晶格玻尔兹曼方法(LBM)的CityLBM代码来评估燃料碎片的空气冷却性能。然而，这些代码基于均匀的笛卡尔网格系统，需要大量的计算时间和成本来捕获复杂的碎屑结构和实际反应堆尺度下的多尺度流动。自适应网格细化(AMR)方法是加速多尺度仿真的关键技术之一。我们在基于GPU的超级计算机上开发了一个AMR版本的CityLBM代码，并将其应用于热流体力学问题。通过JAEA自由对流换热实验验证了该方法的有效性。利用AMR方法，优化了速度梯度和温度梯度较大的壁面附近的网格分辨率，用一半的网格点计算得到的温度分布与实验数据一致。结果还表明，在4个NVIDIA TESLA V100 gpu上基于AMR的CityLBM代码与36个Intel Xeon E5-2680v3 cpu上的JUPITER代码相比，解决方案的速度提高了6.7倍。结果表明，基于AMR的LBM在加速极端尺度热对流模拟方面具有广阔的应用前景。
{"title":"Locally mesh-refined lattice Boltzmann method for fuel debris air cooling analysis on GPU supercomputer","authors":"Naoyuki Onodera","doi":"10.1299/mej.19-00531","DOIUrl":"https://doi.org/10.1299/mej.19-00531","url":null,"abstract":"A dry method is one of practical methods for decommissioning the TEPCO's Fukushima Daiichi nuclear power station. Japan Atomic Energy Agency (JAEA) has been evaluating the air cooling performance of the fuel debris by using the JUPITER code based on an incompressible fluid model and the CityLBM code based on the lattice Boltzmann method (LBM). However, these codes were based on a uniform Cartesian grid system, and required large computational time and cost to capture complicated debris structures and multi-scale flows at the actual reactor scale. The adaptive mesh refinement (AMR) method is one of the key techniques to accelerate multiscale simulations. We develop an AMR version of the CityLBM code on GPU based supercomputers and apply it to thermal-hydrodynamics problems. The proposed method is validated against free convective heat transfer experiments at JAEA. Thanks to the AMR method, grid resolution is optimized near the walls where velocity and temperature gradients are large, and the temperature distribution agrees with the experimental data using half the number of grid points. It is also shown that the AMR based CityLBM code on 4 NVIDIA TESLA V100 GPUs gives 6.7x speedup of the time to solution compared with the JUPITER code on 36 Intel Xeon E5-2680v3 CPUs. The results show that the AMR based LBM is promising for accelerating extreme scale thermal convective simulations.","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72567057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effective Teaching Model for Learning Today's Fukushima after 3.11","authors":"Takashi Hara","doi":"10.3327/JAESJB.62.8_428","DOIUrl":"https://doi.org/10.3327/JAESJB.62.8_428","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"9 1","pages":"428-429"},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85939907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Issues on the spread and continuity of radiation education","authors":"K. Yamaguchi","doi":"10.3327/JAESJB.62.8_426","DOIUrl":"https://doi.org/10.3327/JAESJB.62.8_426","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"24 1","pages":"426-427"},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72750508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the area of Hama-Dori of Fukushima prefecture, the return of displaced people who are expected to be responsible in regional revival is only slight because they fear an influence of the radiation exposure even at low level during longtime of their children. In this paper, risk of gradual exposure likely received in severe nuclear power plant accident has been evaluated to provide a guide to think about how to act, by considering that the process of cancer progression after the damage of DNA due to active oxygen is the same between a natural and radiation induced cancers. The evaluated risk of radiation exposure by 100 msV/y in a lifetime is 2.7 x10 -6 /year and one order magnitude lower than a recent traffic accident.
{"title":"Risk of Gradual Exposure Likely Received in Severe Nuclear Power Plant Accident","authors":"M. Kawai","doi":"10.7566/jpscp.28.051001","DOIUrl":"https://doi.org/10.7566/jpscp.28.051001","url":null,"abstract":"In the area of Hama-Dori of Fukushima prefecture, the return of displaced people who are expected to be responsible in regional revival is only slight because they fear an influence of the radiation exposure even at low level during longtime of their children. In this paper, risk of gradual exposure likely received in severe nuclear power plant accident has been evaluated to provide a guide to think about how to act, by considering that the process of cancer progression after the damage of DNA due to active oxygen is the same between a natural and radiation induced cancers. The evaluated risk of radiation exposure by 100 msV/y in a lifetime is 2.7 x10 -6 /year and one order magnitude lower than a recent traffic accident.","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83939039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Future perspective of restoration policy in Fukushima after 10 years From the Great East Japan Earthquake and nuclear disaster","authors":"K. Tachibana","doi":"10.3327/JAESJB.62.9_494","DOIUrl":"https://doi.org/10.3327/JAESJB.62.9_494","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"154 3 1","pages":"494-498"},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83137896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-22DOI: 10.11484/JAEA-CONF-2020-001
Gerard Rovira Leveroni
{"title":"High-Energy Measurement of the Neutron Capture Cross-Section of 237 Np","authors":"Gerard Rovira Leveroni","doi":"10.11484/JAEA-CONF-2020-001","DOIUrl":"https://doi.org/10.11484/JAEA-CONF-2020-001","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75426591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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