Nuclear Engineering and Technology最新文献

Robust dosimetric evaluation of FLASH proton beams using plane-parallel ionization chambers and EBT-XD films for pre-clinical studies 使用平面平行电离室和EBT-XD薄膜进行临床前研究的FLASH质子束的稳健剂量学评估

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-07-01 DOI: 10.1016/j.net.2025.103749

Heesoon Sheen , Sunghwan Ahn , Chanil Jeon , Youngyih Han , Changhoon Choi , Hee Chul Park , Daizo Amano , Nagaaki Kamiguchi , Sungkoo Cho

{"title":"Robust dosimetric evaluation of FLASH proton beams using plane-parallel ionization chambers and EBT-XD films for pre-clinical studies","authors":"Heesoon Sheen , Sunghwan Ahn , Chanil Jeon , Youngyih Han , Changhoon Choi , Hee Chul Park , Daizo Amano , Nagaaki Kamiguchi , Sungkoo Cho","doi":"10.1016/j.net.2025.103749","DOIUrl":"10.1016/j.net.2025.103749","url":null,"abstract":"<div><div>This study established a robust methodology to evaluate the beam quality and dosimetric characteristics of FLASH-Proton beams. Dose plans were formulated for delivery of 3, 6, and 9 Gy at rates of 40 Gy/s and 70 Gy/s. The dosimetric evaluation employed two plane-parallel ionization chambers (ICs)—PPC-05 and Advanced Markus chamber—alongside EBT-XD film. Key parameters such as recombination and polarity effects of the ICs were measured, and the determined dose was quantified at predefined depths. Beam characteristics were further investigated using the EBT-XD film to corroborate IC findings. Polarity correction factors calculated for PPC-05 were 0.997 and 0.996 at 40 Gy/s and 70 Gy/s, respectively, with corresponding values for the Advanced Markus chamber of 1.0 and 0.999. The mean dose rates, derived from log files, were 52.3 Gy/s and 72.8 Gy/s for nominal rates of 40 Gy/s and 70 Gy/s, respectively. Depth dose profiles from the EBT-XD were analyzed at seven points and compared with measurements from PPC-05, revealing relative dose differences within ±5 % upon application of linear energy transfer correction. The established methodology is validated for routine clinical quality assurance.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103749"},"PeriodicalIF":2.6,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Radiological hazards and environmental impact of natural radioactivity and heavy metals in by-product and topsoil around a Malaysian coal-fired thermal power plant 马来西亚燃煤火力发电厂周围副产品和表土中天然放射性和重金属的辐射危害和环境影响

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-30 DOI: 10.1016/j.net.2025.103770

Eli Syafiqah Aziman , Mohd-Syukri Yahya , Shamsul Amri Sulaiman , Muhammad Asyraf Redzuan , Kamalia Rasyidah Sufyan , Rogemah Ramli , Mohd Idzat Idris , Aznan Fazli Ismail , Alif Imran Mohd Shuhaimi , Rully Hidayatullah

{"title":"Radiological hazards and environmental impact of natural radioactivity and heavy metals in by-product and topsoil around a Malaysian coal-fired thermal power plant","authors":"Eli Syafiqah Aziman , Mohd-Syukri Yahya , Shamsul Amri Sulaiman , Muhammad Asyraf Redzuan , Kamalia Rasyidah Sufyan , Rogemah Ramli , Mohd Idzat Idris , Aznan Fazli Ismail , Alif Imran Mohd Shuhaimi , Rully Hidayatullah","doi":"10.1016/j.net.2025.103770","DOIUrl":"10.1016/j.net.2025.103770","url":null,"abstract":"<div><div>This study assessed radiological and heavy metal (HM) contamination in coal, bottom ash (BA), fly ash (FA), and topsoil within a 5 km radius of a coal-fired power plant (CFPP) in Malaysia. The <sup>226</sup>Ra(<sup>238</sup>U), <sup>232</sup>Th, and <sup>40</sup>K levels in coal, BA, and FA were within regulatory limits, though the FA sample's average <sup>40</sup>K concentration (632.4 Bq/kg) exceeded typical Malaysian soil levels. Some topsoil samples outside the plant showed <sup>232</sup>Th and <sup>40</sup>K levels higher than usual but remained compliant. Most HM levels in coal were below Dutch/Malaysian standards, except for Cd. BA samples had Cr and Cd above target levels by factors of 1 and 4. FA showed As, Cu, Zn, and Cd concentrations 2–10 times higher than targets. Topsoil exhibited As levels 1–4 times over target values, with Cr, Cu, and Zn also exceeding standards. ANOVA results showed no <sup>226</sup>Ra(<sup>238</sup>U), <sup>232</sup>Th, <sup>40</sup>K, or HM accumulation in topsoil due to FA or BA from the CFPP. Elevated radionuclide and HM levels in topsoil beyond the plant were likely linked to other industries. Annual effective dose (AEDE) was slightly over 1 mSv/y. Pollution indices indicated significant contamination in FA and some topsoil, with As as a major contributor.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103770"},"PeriodicalIF":2.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Fast prediction of the flow induced vibration of wire-wrapped fuel rod in a lead-bismuth reactor based on improved DMD and LSTM network 基于改进DMD和LSTM网络的铅铋堆线包燃料棒流动诱导振动快速预测

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-28 DOI: 10.1016/j.net.2025.103780

Yu Zhang, Pengzhou Li, Hongwei Qiao

{"title":"Fast prediction of the flow induced vibration of wire-wrapped fuel rod in a lead-bismuth reactor based on improved DMD and LSTM network","authors":"Yu Zhang, Pengzhou Li, Hongwei Qiao","doi":"10.1016/j.net.2025.103780","DOIUrl":"10.1016/j.net.2025.103780","url":null,"abstract":"<div><div>Flow induced vibration of wire-wrapped fuel rod in lead-bismuth reactor has become an increasing concern due to its significant influence on cladding fretting wear and reactor operation. In this study, we proposed a reduced order model to expedite the prediction of wire-wrapped fuel rod vibration. Firstly, the predefined structural motion is implemented in the fluid solver using a user defined function, while the fluid forces are computed. Subsequently, both the motion and fluid forces are decomposed into mode functions and time coefficients by dynamic mode decomposition. A long short-term memory network is then trained to bridge the time coefficients of motion and fluid forces. Finally, the vibration response of wire-wrapped fuel rod under different conditions is efficiently calculated using the Newmark integration scheme. The results demonstrate that 18 modes are sufficient to reconstruct the fluid forces, significantly reducing computation complexity, while the long short-term memory network provides reasonable fit to the original data. In addition, the study reveals that the motion of wire-wrapped fuel rod can be chaotic when the axial flow velocity exceeds 2.0 m/s. The mechanism of chaos is attributed to period-doubling bifurcation, a phenomenon not observed in prior simulations. Moreover, the asymmetric geometry of wire-wrapped fuel rod consistently leads to ‘elliptic’ trajectory, and the root mean square values of vibration amplitude can be fitted by the power function with respect to axial flow velocity. The proposed method offers a valuable and convenient tool to study the flow induced vibration of wire-wrapped fuel rod with significant efficiency improvement.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103780"},"PeriodicalIF":2.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The role of small modular reactors (SMRs) in achieving Net-Zero emissions by an approach to climate actions 小型模块化反应堆（smr）在通过气候行动方法实现净零排放中的作用

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-27 DOI: 10.1016/j.net.2025.103774

Yun Il Kim , Tae Ho Woo

{"title":"The role of small modular reactors (SMRs) in achieving Net-Zero emissions by an approach to climate actions","authors":"Yun Il Kim , Tae Ho Woo","doi":"10.1016/j.net.2025.103774","DOIUrl":"10.1016/j.net.2025.103774","url":null,"abstract":"<div><div>As the energy sector is a major driver of atmospheric change, the solution to reduce CO<sub>2</sub> emissions from the combustion of fossil fuels, including oil and coal, is sought in nuclear energy. In this study, we apply the inherent low-carbon emission characteristics of small modular reactors (SMRs) to climate change mitigation. Modeling using the system dynamics (SD) method, a complexity analysis algorithm, shows that the climate mitigation effect in the context of SMR deployment shows a gradual and progressive trajectory over time, which is in contrast to other technologies where the benefits appear particularly abruptly after a certain operational threshold (e.g., 90 months of operation).</div><div>The inherent uncertainty associated with carbon-related variables in the Net-Zero World scenario increases variability, as evidenced by the higher standard deviation, where the standard deviation for the Net-Zero World is over 5.0, while that for SMRs is below 1.0. As a result, a society with net-zero carbon emissions must consider significant uncertainties arising from a variety of factors. Small nuclear reactors have the potential to provide a stable and consistent energy supply even under adverse weather conditions, thereby enhancing energy security and grid resilience.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103774"},"PeriodicalIF":2.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 high intensity radio frequency quadrupole accelerator for Suzhou neutron source 苏州中子源高强度射频四极加速器设计

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-27 DOI: 10.1016/j.net.2025.103773

X.W. Liu , Z.M. Zhang , L.S. Long , Z.Y. Zhang , G.X. Chen , L.P. Zou , Z. Yang , B.W. Zhou , J.D. Long , L. Lu , W. Ma

{"title":"Design of high intensity radio frequency quadrupole accelerator for Suzhou neutron source","authors":"X.W. Liu , Z.M. Zhang , L.S. Long , Z.Y. Zhang , G.X. Chen , L.P. Zou , Z. Yang , B.W. Zhou , J.D. Long , L. Lu , W. Ma","doi":"10.1016/j.net.2025.103773","DOIUrl":"10.1016/j.net.2025.103773","url":null,"abstract":"<div><div>Neutrons are essential for material structure analysis and scientific research. The neutron source at Suzhou Laboratory employs a proton linear accelerator, with its low-energy section comprising two pulsed RFQ accelerators. In the beam dynamics design, operating at 324 MHz, two RFQs accelerate proton and negative hydrogen beams from 50 keV to 3 MeV, achieving a 98.3 % transmission efficiency over a 3.385 m electrode length. In the radio frequency (RF) design, a four-vane structure with Dipole Stabilizer Rods (DSRs) was adopted to mitigate mode mixing. Thirty-six tuners provide a ±2 MHz frequency tuning range, while optimized undercuts ensure field uniformity. Simulation of the entire cavity shows an eigenmode frequency of 323.95 MHz and a peak power loss of 203 kW. Multi-physics analysis indicates a cavity frequency shift of 20 kHz due to thermal deformation. This study presents the beam dynamics, RF structure, and multi-physics analysis, confirming that the RFQ design meets operational requirements.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103773"},"PeriodicalIF":2.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Harnessing zirconia and boron synergy: A novel pathway to superior radiation shielding materials 利用氧化锆和硼的协同作用：一种优越的辐射屏蔽材料的新途径

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-26 DOI: 10.1016/j.net.2025.103764

Hanan Akhdar , Ahmed S. Haidyrah , Mohammad W. Marashdeh , K.A. Mahmoud , Islam G. Alhindawy

{"title":"Harnessing zirconia and boron synergy: A novel pathway to superior radiation shielding materials","authors":"Hanan Akhdar , Ahmed S. Haidyrah , Mohammad W. Marashdeh , K.A. Mahmoud , Islam G. Alhindawy","doi":"10.1016/j.net.2025.103764","DOIUrl":"10.1016/j.net.2025.103764","url":null,"abstract":"<div><div>This pioneering work presents a novel approach for manufacturing B-doped ZrO<sub>2</sub>, creating in-situ ZrB<sub>2</sub>O<sub>5</sub> within the ZrO<sub>2</sub> matrix. A cost-effective hydrothermal synthesis using zircon mineral yields a material with exceptional radiation shielding properties. Incorporating B into the ZrO<sub>2</sub> lattice combines ZrO<sub>2</sub>'s gamma attenuation with B's neutron shielding against ionizing radiation. XRD, SEM, and EDX characterization revealed structural properties, phase compositions, and elemental distributions. Monte Carlo simulation and XCOM theoretical modeling investigated B atoms' role in shielding parameters across 0.0332–2.506 MeV γ-ray energies. Results show increased B concentration slightly decreases shielding properties while enhancing mechanical properties including crystallite size, lattice distortions, and dislocation density. B concentration increases from 2.1 to 5.4 wt% decrease LAC values to 65.959–58.613 cm-1 (0.0332 MeV), 0.464–0.461 cm-1 (0.511 MeV), and 0.208–0.270 cm-1 (2.506 MeV). B concentration up to 5.4 wt% enhances mechanical properties without significantly affecting radiation shielding, especially at intermediate energies.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103764"},"PeriodicalIF":2.6,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Radiological risk and mineralogical analysis of radionuclides in granitic rocks: Environmental insights 花岗岩中放射性核素的放射风险和矿物学分析：环境见解

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-26 DOI: 10.1016/j.net.2025.103759

Sherif A. Taalab , Diaa A. Saadawi , Turki Kh Faraj , Mayeen Uddin Khandaker , Mahmoud R. Khattab , Mohamed Y. Hanfi

{"title":"Radiological risk and mineralogical analysis of radionuclides in granitic rocks: Environmental insights","authors":"Sherif A. Taalab , Diaa A. Saadawi , Turki Kh Faraj , Mayeen Uddin Khandaker , Mahmoud R. Khattab , Mohamed Y. Hanfi","doi":"10.1016/j.net.2025.103759","DOIUrl":"10.1016/j.net.2025.103759","url":null,"abstract":"<div><div>This study investigates the activity concentrations of naturally occurring radionuclides, particularly <sup>238</sup>U, <sup>232</sup>Th, and <sup>40</sup>K, in granitic rocks from the Gabal Abu Garadi region in Central-Eastern Egypt. Using high-purity germanium gamma-ray spectrometry, these radionuclides were quantified and evaluated their spatial distribution and mineralogical associations. The mean concentrations of <sup>232</sup>Th and <sup>238</sup>U were found to be 3944 Bq kg<sup>−1</sup> and 6554 Bq kg<sup>−1</sup>, respectively—significantly exceeding global average values reported by UNSCEAR. Radiological hazard indices, including absorbed dose rate (D<sub>air</sub>), annual effective dose (AED), radium equivalent activity (Ra<sub>eq</sub>), annual gonadal dose equivalent (AGDE), and excess lifetime cancer risk (ELCR) were subsequently calculated to assess the potential health risks posed by these elevated levels. Principal Component Analysis (PCA) and correlation analyses revealed <sup>238</sup>U as the primary contributor to radiological risk in the region. The integration of petrographic and mineralogical studies confirmed the presence of uranium- and thorium-bearing minerals such as uranothorite, thorite, zircon, monazite, and samarskite. The findings highlight the necessity for regulatory oversight and radiation protection measures in areas with similarly enriched geological settings.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103759"},"PeriodicalIF":2.6,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thiol unit-functionalized ultrastable two-dimensional polymer for adsorption of palladium ions in a nitric acid medium 巯基单元功能化超稳定二维聚合物在硝酸介质中吸附钯离子

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-25 DOI: 10.1016/j.net.2025.103771

Hao Wu , Mai Tanaka , Naoki Osawa , Seong-Yun Kim

{"title":"Thiol unit-functionalized ultrastable two-dimensional polymer for adsorption of palladium ions in a nitric acid medium","authors":"Hao Wu , Mai Tanaka , Naoki Osawa , Seong-Yun Kim","doi":"10.1016/j.net.2025.103771","DOIUrl":"10.1016/j.net.2025.103771","url":null,"abstract":"<div><div>In contrast to the conventional postsynthetic oxidation process for constructing amide linkages, a two-dimensional (2D) polymer (DPA) platform with abundant amide-linkages was directly constructed in this study via a single step using the condensation reaction of trimesyl chloride and melamine. The subsequent postfunctionalization of the as-prepared platform was performed by further reacting it with cysteamine to form thiol units around the DPA platform. Next, the amide-linked thiol unit–functionalized 2D polymer (DPA-BGA) was applied in the selective adsorption of Pd(II) in a nitric acid medium. DPA-BGA exhibited high chemical stability when immersed in 3 M nitric acid for 24 h and high selectivity for Pd(II) over other 13 types of representative metal ions coexisting in the system. Furthermore, using X-ray photoelectron spectroscopy and density functional theory analyses, a plausible adsorption mechanism that involved the interactions between the thiol unit and Pd(II) was identified. Moreover, recycling experiments were performed to demonstrate the reusability of DPA-BGA, which could be used for at least four consecutive adsorption–desorption cycles without a considerable decrease in performance. This study provides a strategy for constructing a stable amide-linked 2D polymer platform and offers a method for its versatile functionalization for application in the field of nuclear research.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103771"},"PeriodicalIF":2.6,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144492133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Experimental analysis of jet expansion geometry and the influence of pressure waves on the behavior of air discharge processes in subcooled stagnant water 过冷滞水中射流膨胀几何形状及压力波对排气过程影响的实验分析

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-25 DOI: 10.1016/j.net.2025.103768

D. Blanco , J.L. Muñoz-Cobo , C. Berna

{"title":"Experimental analysis of jet expansion geometry and the influence of pressure waves on the behavior of air discharge processes in subcooled stagnant water","authors":"D. Blanco , J.L. Muñoz-Cobo , C. Berna","doi":"10.1016/j.net.2025.103768","DOIUrl":"10.1016/j.net.2025.103768","url":null,"abstract":"<div><div>Gas jet discharges into liquid media are extensively studied due to their relevance in several industrial processes. They are fundamental in nuclear reactor safety and venting systems, where they play roles in overpressure relief, fission product retention, and aerosol scavenging. The presence of pressure waves in these discharges significantly influences the behavior of the process, determining certain aspects of the jet dynamics. This study focuses on understanding the distribution and propagation of pressure waves within the jet, as they can generate shock waves that alter the geometry, trajectory, and conditions of the jet, introducing additional instabilities and complexities. To conduct this analysis, the JEBEA experimental facility was utilized, performing overexpanded and underexpanded discharges through nozzles with inner diameters ranging from 2 to 6 mm. Direct visualization techniques were employed using a high-speed camera to capture image sequences. Subsequently, image processing methods provided detailed information on the jet dynamics and the influence of pressure waves. Results indicate that shock waves generated near the nozzle significantly impact the intensity and frequency of instabilities in the discharges, varying notably between overexpanded and underexpanded conditions, with frequencies ranging from 5 to 40 Hz in overexpanded jets and 1–11 Hz in underexpanded jets.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103768"},"PeriodicalIF":2.6,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Investigations of density wave oscillation in helical tubes with different configurations sharing the same inlet and outlet headers 具有相同进出口集箱的不同结构螺旋管的密度波振荡研究

IF 2.6 3区工程技术

Nuclear Engineering and Technology Pub Date : 2025-06-24 DOI: 10.1016/j.net.2025.103769

Seunghwan Oh, Jun Ha Hwang, Doh Hyeon Kim, Taeyeon Min, Jeong Ik Lee

{"title":"Investigations of density wave oscillation in helical tubes with different configurations sharing the same inlet and outlet headers","authors":"Seunghwan Oh, Jun Ha Hwang, Doh Hyeon Kim, Taeyeon Min, Jeong Ik Lee","doi":"10.1016/j.net.2025.103769","DOIUrl":"10.1016/j.net.2025.103769","url":null,"abstract":"<div><div>Helical steam generators (HSGs) are crucial in the design of small modular reactors, offering excellent heat transfer performance and compact design characteristics. These features make HSGs viable for both light water and non-light water reactors. However, they pose significant design and operational challenges, particularly with respect to two-phase flow instabilities such as density wave oscillation (DWO). DWO arises from complex thermal-hydraulic interactions within the helical tubes, and failure to clearly define stability boundaries can adversely impact the safety and performance of steam generators and reactor operations. This study provides an in-depth experimental and computational analysis of DWO in HSGs to deepen the understanding of thermal-hydraulic characteristics and DWO mechanisms. The analysis focuses on DWO characteristics observed in two configurations: two identical helical tubes and three helical tubes with differing geometries. An experimental facility utilizing R245fa as the working fluid was designed and constructed to provide detailed insights into two-phase pressure drop and DWO characteristics. The data were further used for the validation and improvement of the MARS-KS code, contributing to the establishment of stability boundaries that can represent complex HSGs. This study aims to serve as foundational data for the design and safety assessment of HSGs in the future.</div></div>","PeriodicalId":19272,"journal":{"name":"Nuclear Engineering and Technology","volume":"57 11","pages":"Article 103769"},"PeriodicalIF":2.6,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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