控制棒驱动机构的电磁设计计算

步进磁力提升式控制棒驱动机构的电磁设计计算包括磁场力计算和3种电磁铁磁动势与其线圈长度的设计计算。本文以提升磁铁与提升线圈为代表,介绍了电磁设计计算的基本原理和方法。     

蒸汽发生器液压胀接保压时间及拉脱力的研究

蒸汽发生器是核电站的核心设备,若在正常工作中发生泄漏,将影响整个核动力装置的稳定性和安全性。蒸汽发生器中管板和换热管的连接主要靠液压胀接来完成,液压胀接处最容易发生泄漏,针对蒸汽发生器液压胀接的研究变得至关重要。本文进行了胀接试验及拉脱力试验,确定了合理的保压时间。对胀接过程进行有限元分析,研究了不同厚度管板的残余接触压力,并给出蒸汽发生器拉脱力的理论计算公式。结果表明,保压时间应控制在6~8s,蒸汽发生器拉脱力的计算应使用修正后的公式。     

Zr—4／1Cr18Ni9Ti爆炸焊结合层的显微组织研究

对Ｚｒ－４／１Ｃｒ１８Ｎｉ９Ｔｉ异种金属爆炸焊结合层显微组织及机械性能进行了研究。用透射电镜观察的结果表明，爆炸焊结合层是由熔化和热扩散共同作用的冶金结合，具有良好的机械性能。     

蒸汽爆炸粗混合阶段冷液中高温球传热阻力耦合特性的实验研究

采用蒸发电力模型,设计了高温颗粒同水相互作用的实验装置,进行了一系列单个,多个粒子在不同温度,不同入水初速度和不同冷液过冷度情况下的系列阻力实验,初步实验分析表明,高温颗粒在刚刚穿过冷液表面的下沉速度明显低于冷态颗粒的速度,实验值与蒸发曳力模型计算值符合较好.     

Electromagnetic and structural analyses of the vacuum vessel and plasma facing components for EAST

During plasma disruptions, time-varying eddy currents are induced in the vacuum vessel (VV) and Plasma Facing Components (PFCs) of EAST. Additionally, halo currents flow partly through these structures during the vertical displacement events (VDEs). Under the high magnetic field circumstances, the resulting electromagnetic forces (EMFs) and torques are large. In this paper, eddy currents and EMFs on EAST VV, PFCs and their supports are calculated by analytical and numerical methods. ANSYS software is employed to evaluate eddy currents on VV, PFCs and their structural responses. To learn the electromagnetic and structural response of the whole structure more accurately, a detailed finite element model is established. The two most dangerous scenarios, major disruptions and downward VDEs, are examined. It is found that distribution patterns of eddy currents for various PFCs differ greatly, therefore resulting in different EMFs and torques. It can be seen that for certain PFCs the transient reaction force are severe. Results obtained here may set up a preliminary foundation for the future dynamic response research of EAST VV and PFCs which will provide a theoretical basis for the future engineering design of tokamak devices.     

脉冲堆元件的焊接

脉冲堆用的7种元件的密封包装是通过焊接来完成的。本文以燃料元件为主,着重对焊接设备,焊接工艺及质量检验进行了介绍,同时还介绍了脉冲氩弧焊和氦弧堵孔焊的工艺。     

模拟核爆后环境放射性监测研究

本文研究了在某市模拟核爆后监测放射性污染的方法,包括采样点布设、落下灰、气溶胶、水、粮食、蔬菜样品的收集与其中总β放射性的测量方法,以及环境贯穿辐射剂量率的监测方法等。     

脉冲堆核容器两元混合气体保护焊

脉冲堆核容器选用LT_(24)特殊铝合金作为主要结构材料。由于其特殊的强化机制,可焊性差,单用氩气或氦气保护焊均不能满足焊接要求。通过试验发现,采用氩-氦两元混合气体保护焊,当氩-氦体积比例恰当时,所焊接的核容器完全达到设计要求。     

核爆次声监测技术的研究现状与技术可行性分析

介绍了次声监测技术在核爆监测系统中的作用,阐述了核爆次声监测技术的研究现状与研究进展情况,并对开展核爆次声监测技术研究的技术可行性进行了分析.     

卫星地面站环境电磁辐射的预测

本文从环境保护和电磁兼容的研究目的出发,论述了卫星地面站电磁辐射公众暴露水平的测量原理、测量方法以及理论计算。根据测量和理论计算结果,预测卫星地面站电磁辐射对环境的影响,并作出卫生学评价。     

AFA 3G燃料组件骨架导向管与格架的压力电阻焊工艺研究

骨架点焊是压水堆燃料组件制造过程中的重要工序。对AFA 3G骨架点焊焊接技术，即格架与变径导向管之间的压力电阻点焊，在我国尚属一个崭新的技术课题。在大量实验的基础上，就不同的焊接规范对焊点质量的影响进行了详细的讨论与研究，包括焊点的剪切力、焊点熔核尺寸以及焊点腐蚀性能，从而获得了比较理想的焊接规范。     

Numerical analysis of MD events and preliminary thermal calculation for KTX vacuum vessel

KTX is a new reversed field pinch (RFP) magnetic confinement device which is under design in ASIPP and USTC. Major disruption (MD) events may occur in future operating process, which is simulated with the finite element (FE) method. The results present that the peaks of eddy currents on vessel and conductor shell are respectively 11.791 kA and 68.637 kA with maximum stress 67.1 MPa due to high transient electromagnetic (EM) force. It is confirmed that the structure is still strong enough to bear the electromagnetic loads even if the worst case. Besides, as KTX vacuum vessel will take the method of natural cooling for heat dissipation during plasma discharge (0.5–1.0 MA), a preliminary thermal calculation was implemented in normal condition to decide suitable time parameters such as duration and interval. It is suggested that the discharge interval should be no less than 5 min for the complete 1 MA plasma with 100 ms duration, which can guarantee the temperature of vacuum vessel below 200 °C.     

Understanding the Mechanism of Nanoparticle Formation in a Wire Explosion Process by Adopting the Optical Emission Technique

In the present study nano-tungsten carbide particles were generated in a wire explosion process.The plasma generated during the wire explosion process was analyzed using optical emission spectroscopy(OES).The impact of ambient pressure on the plasma temperature,electron density and plasma lifetime was studied.Lifetime variations of the plasma produced under different experimental conditions were analyzed.The produced nanoparticles were characterized through wide angle X-ray diffraction(WAXD) and transmission electron microscopy(TEM) studies. Particles produced with a negative DC charging voltage had a larger mean size when compared to a positive charging voltage.Polarity dependence on the plasma duration was observed where plasma was sustained for a longer duration with a negative DC charging voltage.