共查询到17条相似文献,搜索用时 62 毫秒
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数值反应堆是基于先进耦合建模技术、大规模并行计算技术、先进的验证与确认(V&V)等技术,建立在超级计算机上,可实现实际反应堆各种物理过程高精细模拟预测的复杂软件系统。它是实际反应堆“外在”和“内在”的镜像,是先进的核反应堆设计优化、高效运行、事故预测和应急以及新材料研发等的试验验证平台。本文在简略综述国内外典型数值反应堆研究成果的基础上,描述了本课题组近期开发的数值反应堆核心软件组成体系,分析了数值反应堆对计算资源和存储资源的需求,并介绍了目前正在开展的中国数值反应堆原型系统(CVR1.0)的研究进展。进展主要包括:两相子通道热工水力模拟软件、单相CFD热工水力模拟软件、多尺度材料辐照损伤模拟软件、直接3D中子输运特征线法模拟软件,以及这些软件与欧美CASL、NEAMS、RPV等相关软件的对比和在神威、曙光等超级计算机上的测试结果。 相似文献
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CAP1400为我国自行研发的装机容量为140万kW的先进非能动三代核电机组。本文以高斯烟羽模型为基础,介绍了我国自行设计的CAP1400核电站正常运行工况下气载排出物的弥散模式。针对实际情况,计算中对模型进行了相关修正,如有效源高、干湿沉积、放射性衰减等,结合示范电厂石岛湾厂址的气象数据,采用C-AIRDOS程序对气载放射性核素的大气弥散因子、年均浓度分布和部分核素的地面沉积浓度进行了模拟计算。为了解CAP1400示范核电厂运行后对周边地区的辐射环境影响提供了参考信息。 相似文献
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As the basis and fundamentals of nuclear technology, reactor physics has an important role to play; recent requirements for reliability and accountability to realize a higher level of safety have been encouraging researchers and engineers to study and develop more advanced and sophisticated numerical methods and calculation codes. Many of the outstanding research and developments are presented in scientific journals, including the Journal of Nuclear Science and Technology. Some topics have been covered in this summary from the latest activities in the field of reactor physics. 相似文献
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新能源中的核电发展 总被引:3,自引:0,他引:3
对近年世界核电发展作了概述,指出核电发展远落后于期望值,核电发展任重道远。论述了发展核电对我国环境保护和经济发展的重要意义,对核能发展规划进行了讨论。通过世界核电强国发展核电的战略,阐述了我国的核电发展战略和技术主线,指出AP1000、CAP1000、CAP1400和CAP1700作为大型先进压水堆,在相当长一段时间内将是我国的主力机型,同时CAP1400和CAP1700将成为世界上极具竞争力的机型。对于第四代反应堆,超临界水冷堆在我国有较深厚的工业基础,较适合在我国发展。此外还要继续加强对快堆的投入,以实现先进的燃料闭式循环,同时也应关注目前的\"行波堆\"和中小型模块式反应堆。最后对目前的核电大发展提出了建议。 相似文献
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VSOP程序广泛用于球床高温气冷堆的工程设计。对于被布置在堆芯侧反射层孔道中、用于反应性控制的吸收体,由于物理计算方法的限制,VSOP程序不具备计算其价值的功能,必须借助其他确定论程序进行外部耦合计算,涉及到几何的近似处理、截面的归并和转换,可能引入额外的误差。为此,本文采用蒙特卡罗程序建立了精细的堆芯模型,真实描述了堆芯活性区的球床结构、侧反射层的孔道结构、吸收体的形状和位置,在同样的堆芯状态下,比较了确定论耦合程序和MCNP程序计算得到的吸收体价值。结果表明:确定论耦合程序的计算结果是准确的,从设计角度上是偏保守的。 相似文献
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数值反应堆是基于大规模并行计算平台,利用先进的物理模型和数值模拟算法,采用精细化建模,从而精确模拟反应堆在正常运行与事故工况中发生的各类物理现象的模拟技术。西安交通大学NECP团队基于自研的多群和连续能量数据库,提出了全局 局部耦合输运计算方法、大规模并行的2D/1D耦合输运方法等,开发了基于确定论方法的数值反应堆物理程序NECP X,并在此基础上实现了物理 热工 燃料性能分析的多物理耦合模拟计算。基于该程序及其耦合系统,在商用大型压水堆、研究堆和实验堆中进行了验证应用。数值结果表明,NECP X程序及其耦合系统可准确预测反应堆在运行过程中的关键安全参数随时间的演变情况,如有效增殖因数、功率、温度、应力、间隙宽度等,可为商用大型压水堆、研究堆和研究堆的设计及安全分析提供可靠的工具。 相似文献
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《Fusion Engineering and Design》2014,89(9-10):1875-1879
Three mesh adaptivity algorithms were developed to facilitate and expedite the use of the CADIS and FW-CADIS hybrid Monte Carlo/deterministic techniques in accurate full-scale neutronics simulations of fusion energy systems with immense sizes and complicated geometries. First, a macromaterial approach enhances the fidelity of the deterministic models without changing the mesh. Second, a deterministic mesh refinement algorithm generates meshes that capture as much geometric detail as possible without exceeding a specified maximum number of mesh elements. Finally, a weight window coarsening algorithm decouples the weight window mesh and energy bins from the mesh and energy group structure of the deterministic calculations in order to remove the memory constraint of the weight window map from the deterministic mesh resolution. The three algorithms were used to enhance an FW-CADIS calculation of the prompt dose rate throughout the ITER experimental facility and resulted in a 23.3% increase in the number of mesh tally elements in which the dose rates were calculated in a 10-day Monte Carlo calculation. Additionally, because of the significant increase in the efficiency of FW-CADIS simulations, the three algorithms enabled this difficult calculation to be accurately solved on a regular computer cluster, eliminating the need for a world-class super computer. 相似文献
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《Fusion Engineering and Design》2014,89(9-10):1933-1938
The rigorous 2-step (R2S) computational system uses three-dimensional Monte Carlo transport simulations to calculate the shutdown dose rate (SDDR) in fusion reactors. Accurate full-scale R2S calculations are impractical in fusion reactors because they require calculating space- and energy-dependent neutron fluxes everywhere inside the reactor. The use of global Monte Carlo variance reduction techniques was suggested for accelerating the R2S neutron transport calculation. However, the prohibitive computational costs of these approaches, which increase with the problem size and amount of shielding materials, inhibit their ability to accurately predict the SDDR in fusion energy systems using full-scale modeling of an entire fusion plant. This paper describes a novel hybrid Monte Carlo/deterministic methodology that uses the Consistent Adjoint Driven Importance Sampling (CADIS) method but focuses on multi-step shielding calculations. The Multi-Step CADIS (MS-CADIS) methodology speeds up the R2S neutron Monte Carlo calculation using an importance function that represents the neutron importance to the final SDDR. Using a simplified example, preliminary results showed that the use of MS-CADIS enhanced the efficiency of the neutron Monte Carlo simulation of an SDDR calculation by a factor of 550 compared to standard global variance reduction techniques, and that the efficiency enhancement compared to analog Monte Carlo is higher than a factor of 10,000. 相似文献
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Michal Košťál František Cvachovec Jiří Cvachovec Bohumil Ošmera Wolfgang Hansen 《Annals of Nuclear Energy》2011
In this paper computational procedures and the experimental determination of the AKR-2 (Technical University Dresden) beam parameters are described. The calculations were performed using the MCNPX code (Pelowitz, 2002) and the nuclear data libraries ENDF/B VI.2., ENDF/B VII.0., JEFF 3.1., JENDL 3.3 and BROND 3. The nuclear data were processed using the NJOY code (MacFarlane and Muir, 1994). The measurements were performed with a two-parameter stilbene spectrometer (Bures et al., 2002). 相似文献