Kerntechnik最新文献_第7页

Dynamics effects of tritium reduction on the energy gain of D-T fuel pellet using double cone ignition 氚还原对双锥点火D-T燃料球团能量增益的动力学影响

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-01-05 DOI: 10.1515/kern-2022-0074

Roohalah Mirzaeian, S. Hosseinimotlagh, M. Shaghaghian

引用次数: 0

Prediction of heat transfer characteristics in a microchannel with vortex generators by machine learning 基于机器学习的涡流发生器微通道传热特性预测

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-01-05 DOI: 10.1515/kern-2022-0075

Alişan Gönül, A. B. Çolak, Nurullah Kayaci, Abdulkerim Okbaz, A. S. Dalkılıç

{"title":"Prediction of heat transfer characteristics in a microchannel with vortex generators by machine learning","authors":"Alişan Gönül, A. B. Çolak, Nurullah Kayaci, Abdulkerim Okbaz, A. S. Dalkılıç","doi":"10.1515/kern-2022-0075","DOIUrl":"https://doi.org/10.1515/kern-2022-0075","url":null,"abstract":"Abstract Because of the prompt improvements in Micro-Electro-Mechanical Systems, thermal management necessities have altered paying attention to the compactness and high energy consumption of actual electronic devices in industry. In this study, 625 data sets obtained numerically according to the change of five different geometric parameters and Reynolds numbers for delta winglet type vortex generator pairs placed in a microchannel were utilized. Four dissimilar artificial neural network models were established to predict the heat transfer characteristics in a microchannel with innovatively oriented vortex generators in the literature. Friction factor, Nusselt number, and performance evaluation criteria were considered to explore the heat transfer characteristics. Different neuron numbers were determined in the hidden layer of each of the models in which the Levethenberg–Marquardt training algorithm was benefited as the training algorithm. The predicted values were checked against the target data and empirical correlations. The coefficient of determination values calculated for each machine learning model were found to be above 0.99. According to obtained results, the designed artificial neural networks can provide high prediction performance for each data set and have higher prediction accuracy compared to empirical correlations. All data predicted by machine learning models were collected within the range of ±3% deviation bands, whereas the majority of the estimated data by empirical correlations dispersed within ±20% ones. For that reason, a full evaluation of the estimation performance of artificial neural networks versus empirical correlations data is enabled to fill a gap in the literature as one of the uncommon works.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"36 1","pages":"80 - 99"},"PeriodicalIF":0.5,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81389333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Investigating the in-core 60Co production assembly for open pool type reactor 开池式反应堆芯内60Co生产装置的研究

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-23 DOI: 10.1515/kern-2022-0094

Amr Abdelhady

引用次数: 0

Effective physical protection system design and implementation at a radiological facility: an integrated and risk management approach 辐射设施的有效物理防护系统设计和实施:综合风险管理方法

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-22 DOI: 10.1515/kern-2022-0042

M. Ansah, B. Stepanov, Paul Attah Amoah, E. Agyekum

{"title":"Effective physical protection system design and implementation at a radiological facility: an integrated and risk management approach","authors":"M. Ansah, B. Stepanov, Paul Attah Amoah, E. Agyekum","doi":"10.1515/kern-2022-0042","DOIUrl":"https://doi.org/10.1515/kern-2022-0042","url":null,"abstract":"Abstract Lives are threatened whenever there is an act of theft or destruction against a nuclear and radiological facility thus, physical protection systems are effectively employed to prevent or mitigate loss of valuable assets. Health facilities that provide radiotherapy services have in their facility a temporary storage unit where disused radioactive sources 60Co, 137Cs and 192Ir are kept and this raises concerns for effective physical protection. An integrated physical protection System was considered to consolidate of all sub systems, sensors and elements related to protection system for an effectively secured environment at a radiological facility. Sequence adversary diagram (ASD) was developed to depict the paths that enemies can take to achieve sabotage or stealing objectives and analyze flews in the paths. The approach to this security system effectiveness focuses on using probabilistic statistical methods for risk evaluation considering detection, delays and response. This paper considers the basic and effective elements required for physical protection system for a radiological center and makes risk evaluation as an approach of security system effectiveness which can serve as fundamental guiding principle for decision makers in the establishment of an effective physical protection for a radiological center.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"55 1","pages":"43 - 53"},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91367964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of nanofluid flows’ optimum velocity in finned tube-in-tube heat exchangers using artificial neural network 基于人工神经网络的翅片管内换热器纳米流体最佳流速预测

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-22 DOI: 10.1515/kern-2022-0097

A. B. Çolak, H. Mercan, Özgen Açıkgöz, A. S. Dalkılıç, S. Wongwises

{"title":"Prediction of nanofluid flows’ optimum velocity in finned tube-in-tube heat exchangers using artificial neural network","authors":"A. B. Çolak, H. Mercan, Özgen Açıkgöz, A. S. Dalkılıç, S. Wongwises","doi":"10.1515/kern-2022-0097","DOIUrl":"https://doi.org/10.1515/kern-2022-0097","url":null,"abstract":"Abstract The average flow velocity in heat exchangers is considered less often and thus needs further and detailed investigation because of its crucial influence on the overall thermal performance of the application. The use of nanofluids has similar influences to finned tube designs. Considering the rise in heat transfer and pressure drop, uncertainties in cost analyses with the uses of fins and nanoparticles, evaluation of optimum operating velocity of the fluids is necessary. On the contrary, there aren’t enough experimental, parametric, or numerical investigations present on this subject. The use of machine learning techniques to heat transfer applications to make optimization becomes popular recently. In this work, important factors of the process as tube number, cleanliness factor, and overall cost as output factors have been estimated by an artificial intelligence method using 339 data points. The influence of input factors of Reynolds number, thermal conductivity, specific heat, viscosity, and total fin surface efficiency on the outputs have been studied. Total tube number, cleanliness factor, and total cost analysis have been determined with deviations of −0.66%, 0.001%, and 0.12% as a result of the solution with 6 inputs, correspondingly.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"605 1","pages":"100 - 113"},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78946603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Determination of limiter design and material composition of MT-II spherical tokamak MT-II型球形托卡马克限制器设计及材料组成的确定

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-22 DOI: 10.1515/kern-2022-0073

Shahab Ud-Din Khan, Muhammad Abdullah, Ahmad Ali, R. Khan, Sehrish Shakir, Z. Rehman, Shahzaib Zahid, R. Ali

{"title":"Determination of limiter design and material composition of MT-II spherical tokamak","authors":"Shahab Ud-Din Khan, Muhammad Abdullah, Ahmad Ali, R. Khan, Sehrish Shakir, Z. Rehman, Shahzaib Zahid, R. Ali","doi":"10.1515/kern-2022-0073","DOIUrl":"https://doi.org/10.1515/kern-2022-0073","url":null,"abstract":"Abstract MT-II is a spherical tokamak with a major radius of 0.15 m and a minor radius of 0.09 m, currently under development at the Pakistan Tokamak Plasma Research Institute. It is designed with a higher elongation of 2.67. This paper presents the design and material analysis of the limiter configuration for the MT-II tokamak, which is being carried out in two phases. In the first phase, theoretical studies and calculations are performed to estimate the plasma edge temperature, density, particle velocity, input power, heat flux, heat load and surface temperature on the limiter tile. In the second phase, computational techniques are applied to analyses the material properties, the maximum/minimum surface temperature rise (∆T °C) at stable heat load and power deposition based on theoretical calculations that will help optimize the design parameters of the limiter. The type of material and the surface temperature of the limiter as well as the general design parameters of MT-II are included in the proposed poloidal limiter. The results suggest that crystalline vein graphite is a suitable candidate for the proposed poloidal limiter. A combination of mechanical and electrical feedthrough techniques are used to improve the performance of the limiter. The proposed limiter is able to meet the requirements of MT-II.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"48 1","pages":"54 - 62"},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75725118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Application of the COCOSYS code in the safety evaluation of Czech nuclear power plants COCOSYS规范在捷克核电厂安全评价中的应用

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-22 DOI: 10.1515/kern-2022-0087

A. Kecek, Lubomír Denk, Iana Zamakhaeva

{"title":"Application of the COCOSYS code in the safety evaluation of Czech nuclear power plants","authors":"A. Kecek, Lubomír Denk, Iana Zamakhaeva","doi":"10.1515/kern-2022-0087","DOIUrl":"https://doi.org/10.1515/kern-2022-0087","url":null,"abstract":"Abstract Safety analyses of nuclear power plant accidents are a key tool in demonstration of nuclear safety and reliability. The chain of the safety analyses comprises several follow-up activities like neutronic core calculation, primary system simulation and containment response to a loss-of-coolant accident. The analyses can be done with numerous computational tools like the GRS codes ATHLET and COCOSYS. The COCOSYS and its predecessor RALOC have been used in a variety of safety analyses at UJV conducted in the framework of technical support of the Czech nuclear power plants. Application of the code in the field of nuclear power plant safety analyses is ruled by the Czech legislative, which defines a process called standardization. The standardization procedure equivalent to validation and verification process provides further independent validation on the level of user organization. In past decades, COCOSYS has been successfully used in numerous DBA and DEC-A analyses of VVER-1000/V-320 containment, evaluating both thermal hydraulic conditions as well as fission product source term. This paper summarizes independent COCOSYS validation at UJV, including setup of the iodine dry paint deposition model to Ameron Amerlock paint. Furthermore, a VVER-1000/V-320 containment model is presented and analysis of DBA and DEC-A LB LOCA at VVER-1000/V-320 is conducted. The evaluation of the results aims at confirmation of acceptance criteria related to containment and impact of containment spray system. An emphasis is given to evaluation of containment source term, where comparison of both events is conducted for release of iodine, cesium, and xenon.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"142 1","pages":"1 - 12"},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75246063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and evaluation of ecological interface for Feedwater Deaerating Tank and Gas Stripper System based on cognitive work analysis 基于认知工作分析的给水除氧池与汽提塔系统生态界面设计与评价

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-12-07 DOI: 10.1515/kern-2022-0067

Zhihui Xu, Junzhou He, Gang Wu, Huaqing Peng, Zhiyao Liu, S. Yan

引用次数: 0

Evaluation of different integrated burnable absorber materials in fuel assemblies of Bushehr WWER-1000 nuclear reactor 布什尔WWER-1000核反应堆燃料组件中不同综合可燃吸收材料的评价

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-11-30 DOI: 10.1515/kern-2022-0054

Zahra Papi, F. Khoshahval, Reza Pour-Imani

{"title":"Evaluation of different integrated burnable absorber materials in fuel assemblies of Bushehr WWER-1000 nuclear reactor","authors":"Zahra Papi, F. Khoshahval, Reza Pour-Imani","doi":"10.1515/kern-2022-0054","DOIUrl":"https://doi.org/10.1515/kern-2022-0054","url":null,"abstract":"Abstract Nowadays, reducing fuel consumption, fuel cost, and fuel waste is obtained by increasing the burnup and reactor cycle length as essential goals in nuclear power plants. Due to the scarcity of Iran’s uranium resources and the plan for using new types of fuel in the Water–Water Energetic Reactors (WWER-1000) at Bushehr Nuclear Power Plant (BNPP), utilizing Integral Burnable Absorbers (IBAs) is of great importance. In the present study, a neutronic evaluation has been conducted to investigate the variations of infinite multiplication factor versus burnup, reactivity swing, and power distribution in various IBAs, including Gd2O3-UO2, Er2O3-UO2, and Dy2O3-UO2. The results were compared with the standard burnable absorber in the BNPP reactor core (CrB2Al). It can be concluded that gadolinium IBA, with a concentration of 5%, has the greatest effect on the initial reactivity and reduces the reactivity swing by 19% compared to the CrB2Al BA. In addition, by using coaxial gadolinium-erbium IBA pins, as well as optimizing the neutronic condition, the reactor cycle length increased by 1.01 GWd/MTU compared to the standard Bushehr BA.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"35 1","pages":"33 - 42"},"PeriodicalIF":0.5,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80394073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of an unattended ore grading measurement system in a uranium mine 某铀矿无人值守分级测量系统的设计

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2022-11-22 DOI: 10.1515/kern-2022-0059

Cong Chen, Weihua Zeng, Shengli Hou, Yike Ding

引用次数: 0