Transactions of the Atomic Energy Society of Japan最新文献_第4页

Comparison of Photonuclear Data Files Used in Shielding Calculation of a Medical Linac Room 医用直线室屏蔽计算中光核数据文件的比较

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/TAESJ.J20.005

K. Kosako, Takashi Nakamura

引用次数: 2

Radiation monitoring and evaluation of exposure doses to lift the evacuation orders for the zones designated for reconstruction and recovery 对辐射进行监测和评估，以解除重建和恢复指定地区的疏散令

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/TAESJ.J20.021

Y. Sanada, H. Kurikami, H. Funaki, K. Yoshimura, Tomohisa Abe, Mutsushi Ishida, S. Tanimori, R. Sato

{"title":"Radiation monitoring and evaluation of exposure doses to lift the evacuation orders for the zones designated for reconstruction and recovery","authors":"Y. Sanada, H. Kurikami, H. Funaki, K. Yoshimura, Tomohisa Abe, Mutsushi Ishida, S. Tanimori, R. Sato","doi":"10.3327/TAESJ.J20.021","DOIUrl":"https://doi.org/10.3327/TAESJ.J20.021","url":null,"abstract":"The Japanese government is beginning to consider radiation protection in the “ speciﬁc reconstruc tion reproduction base area” of the Fukushima nuclear power plant, the evacuation order of which will be lifted by 2023. It is essential to grasp the present situation of radiation contamination and evaluate exposure dose in the area to realize the lifting of this evacuation order zone. Many surveys on the evaluation of the distributions of air dose rate have been carried out, and exposure dose has been esti-mated using the results since the Fukushima Daiichi Nuclear Power Plant accident. Nevertheless, more detailed information on exposure is needed for the area because the radiation level is relatively high. This will also be helpful in preparing a prudent evaluation plan. This study is aimed at evaluat-ing the detailed contamination situation in the area and estimating exposure dose with consideration of areal circumstances. Work was carried out for （ 1 ） an airborne survey of the air dose rate using an unmanned helicopter and ground-based measurement （ walk-survey ） , （ 2 ） the evaluation of airborne radiocesium and （ 3 ） the estimation of external / internal effective doses for the typical life patterns as-sumed. Our study resulted in a detailed map of the air dose rate and clariﬁed the distribution pattern in the area. Moreover, the exposure dose of residents was evaluated by considering some life patterns based on this map.","PeriodicalId":55893,"journal":{"name":"Transactions of the Atomic Energy Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69437572","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}

引用次数: 2

Applicability of Equivalent Linear Analysis to Reinforced Concrete Shear Walls: 3D FEM Simulation of Experiment Results of Seismic Wall Ultimate Behavior 钢筋混凝土剪力墙等效线性分析的适用性:抗震墙极限性能试验结果的三维有限元模拟

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.038

Yoshitaka Ichihara, N. Nakamura, H. Moritani, Tomohiro Horiguchi, Byunghyun Choi

{"title":"Applicability of Equivalent Linear Analysis to Reinforced Concrete Shear Walls: 3D FEM Simulation of Experiment Results of Seismic Wall Ultimate Behavior","authors":"Yoshitaka Ichihara, N. Nakamura, H. Moritani, Tomohiro Horiguchi, Byunghyun Choi","doi":"10.3327/taesj.j20.038","DOIUrl":"https://doi.org/10.3327/taesj.j20.038","url":null,"abstract":"In this study, we aim to approximately evaluate the effect of nonlinearity of reinforced concrete structures through seismic response analysis using the equivalent linear analysis method. A simulation analysis was performed for the ultimate response test of the shear wall of the reactor building used in an international competition by OECD / NEA in 1996. The equivalent stiffness and damping of the shear wall were obtained from the trilinear skeleton curves proposed by the Japan Electric Association and the hysteresis curves proposed by Cheng et al. The dominant frequency, maximum acceleration response, maximum displacement response, inertia force-displacement relationship, and acceleration response spectra of the top slab could be simulated well up to a shear strain of approximately γ ＝ 2.0 × 10 － 3 . The equivalent linear analysis used herein underestimates the maximum displacement response at the time of ultimate fracture of approximately γ ＝ 4.0 × 10 － 3 . Moreover, the maximum shear strain of the shear wall could not capture the locally occurring shear strain compared with that of the nonlinear analysis. Therefore, when employing this method to evaluate the maximum shear strain and test results, including those during the sudden increase in displacement immediately before the fracture, sufﬁcient attention must be paid to its applicability.","PeriodicalId":55893,"journal":{"name":"Transactions of the Atomic Energy Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69437708","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}

引用次数: 0

Sorption Behavior of Cesium on Calcium Silicate Hydrate Gel Formed as Secondary Mineral under the Coexistence Condition of Sulfate Ions 硫酸盐离子共存条件下作为次生矿物形成的水合硅酸钙凝胶对铯的吸附行为

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.017

N. Tamura, Taiji Chida, Seong Yun Kim, Y. Niibori

引用次数: 0

Qualitative Data Analysis of Testimony on the Safety Measures Prior to the Fukushima Daiichi Accident 福岛第一核电站事故前安全措施证言的定性数据分析

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.013

R. Matsui

引用次数: 0

Evaluation of Hydrogen Accumulation Suppression and Measurement Performance for Pressure Transmitter Using Palladium 钯压力变送器抑氢性能及测量性能评价

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.020

R. Kuwana, Daisuke Shinma, Atsushi Fushimi, Hideki Hanami, I. Hara, Hideyuki Henmi

引用次数: 0

True cause of Fukushima Meltdown Accident New Analysis about Loss of Core Cooling Based on Latest Data 福岛熔毁事故的真正原因基于最新数据的堆芯冷却损失新分析

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/TAESJ.J20.029

Tsuyoshi Matsuoka

{"title":"True cause of Fukushima Meltdown Accident New Analysis about Loss of Core Cooling Based on Latest Data","authors":"Tsuyoshi Matsuoka","doi":"10.3327/TAESJ.J20.029","DOIUrl":"https://doi.org/10.3327/TAESJ.J20.029","url":null,"abstract":"The purpose of this paper is to clarify the true cause of the Fukushima meltdown accident from the viewpoint of reactor design. There are only two factors. One is that a total loss of battery power was not considered in the basic design, and the other is that the fail-close design was selected in longterm core cooling systems, as the confine function was preferred over the cool function in the three safety functions of stop (nuclear reaction), cool (decay heat) and confine (radioactivity) in the basic criteria. After the loss of all power (battery and station power) in Unit 1, the IC system failed because of the fail-close design. After the loss of all power in Unit 2, the core-cooling function of the RCIC system failed because of the instability of two-phase flow in the turbine steam line, since the core decay heat was confined in the reactor and containment vessel owing to the fail-close design of the vent valves. As loss of station power occurred but battery power was available in Unit 3, operators were able to activate the RCIC system, which was tripped by the trip signal after one day. Then, the HPCI system was started automatically but stopped after about 10 hours because of the loss of battery power. After the loss of core cooling, core meltdown occurred in Units 1 to 3. The lessons learned from this accident are that the core-cooling system should be designed to withstand the loss of all power in its basic design and that the cool function should be preferred over the confine function.","PeriodicalId":55893,"journal":{"name":"Transactions of the Atomic Energy Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69437641","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}

引用次数: 2

Determination of Parameters for an Equation to Obtain Natural Background Radiation Using KURAMA-II Loaded with C12137-01 CsI(Tl) Detector 装载C12137-01 CsI(Tl)探测器的KURAMA-II获取自然本底辐射方程参数的确定

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/TAESJ.J20.007

M. Andoh, N. Matsuda, Kimiaki Saito

引用次数: 1

In situ spectrometry of terrestrial gamma rays using portable germanium detectors in area of 80 km radius around the Fukushima Daiichi nuclear power plant 在福岛第一核电站周围80公里半径范围内使用便携式锗探测器对地面伽马射线进行现场光谱分析

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.010

S. Mikami, Hiroyuki Tanaka, Naotoshi Okuda, R. Sakamoto, Kotaro Ochi, Kiichiro Uno, N. Matsuda, Kimiaki Saito

{"title":"In situ spectrometry of terrestrial gamma rays using portable germanium detectors in area of 80 km radius around the Fukushima Daiichi nuclear power plant","authors":"S. Mikami, Hiroyuki Tanaka, Naotoshi Okuda, R. Sakamoto, Kotaro Ochi, Kiichiro Uno, N. Matsuda, Kimiaki Saito","doi":"10.3327/taesj.j20.010","DOIUrl":"https://doi.org/10.3327/taesj.j20.010","url":null,"abstract":"To determine the background radiation level in an area affected by the Fukushima Daiichi nuclear power plant accident in 2011, natural terrestrial gamma rays had been measured using portable germanium detectors repeatedly from 2013 through 2019, at 370 locations within an area of 80 km radius around the Fukushima Daiichi nuclear power plant. At these locations, radioactive 238 U, 232 Th, and 40 K concentrations in soil and air kerma rates at a height of 1 m above the ground due to terrestrial gamma rays were obtained by the method indicated in ICRU report 53. The average 238 U, 232 Th, and 40 K concentrations were 18.8 （ standard deviation, SD: 6.37 ） , 22.7 （ SD: 11.7 ） , and 428 （ SD: 163 ） Bq / kg, respectively, and the average air kerma rate over the area was found to be 0.0402 （ SD: 0.0146 ） μ Gy / h. The obtained air kerma rates were compared with those reported in the literature. It was conﬁrmed that the measured data positively correlated with each other with a regression coefﬁ cient close to one and agreed within a factor of two. A trend similar to that in previous ﬁndings was observed, that is, the air kerma rates at locations geologically classiﬁed as granite and rhyolite zones were statistically signiﬁcantly higher than those at other locations.","PeriodicalId":55893,"journal":{"name":"Transactions of the Atomic Energy Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69437544","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}

引用次数: 0

A Study of Knowledge Management on Enhancing the Effectiveness of Plant Life Management for Nuclear Power Plants 提高核电厂生命管理有效性的知识管理研究

Transactions of the Atomic Energy Society of Japan Pub Date : 2021-01-01 DOI: 10.3327/taesj.j20.024

Hideo Tanaka, N. Sekimura

{"title":"A Study of Knowledge Management on Enhancing the Effectiveness of Plant Life Management for Nuclear Power Plants","authors":"Hideo Tanaka, N. Sekimura","doi":"10.3327/taesj.j20.024","DOIUrl":"https://doi.org/10.3327/taesj.j20.024","url":null,"abstract":"In the long-term energy supply and demand outlook, the energy mix has become a global trend, and nuclear power plants （ NPPs ） are required to maintain a certain power ratio over a long period in Japan. Under such circumstances and with the energy mix, the long-term operation （ LTO ） of existing NPPs is attracting attention. LTO requires proper management during the operation period of the NPP, including decommissioning; this is plant life management （ PLM ） . In this study, we will take up PLM, which is an activity performed to realize LTO, give an overview of the current situation in Japan, and present performance indicators to measure its effectiveness. As a result, it becomes clear that a continuous improvement can be observed by adding a time axis to the form of knowledge that has been considered thus far. Furthermore, regarding the reduction in the number of accidental fail-ures, which is the remaining issue related to physical deterioration, technical and organizational as-pects will be discussed as countermeasures, and solutions will be presented along with a systematic diagram of knowledge management.","PeriodicalId":55893,"journal":{"name":"Transactions of the Atomic Energy Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69437582","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}

引用次数: 0