塑料挤出机机筒壁厚设计的线性回归模型

基于力学理论和热平衡原理,建立了塑料挤出机机筒壁厚设计的线性回归模型,并从理论上论证了模型的合理性。利用一些成熟产品的设计给出了模型的解,且据此求得的产品设计参数与经验值高度吻合,明显改进了文献提供的参考值,表明模型在实践中是有效的。     

Two types of a passive safety containment for a near future BWR with active and passive safety systems

The paper presents two types of a passive safety containment for a near future BWR. They are named Mark S and Mark X containment. One of their common merits is very low peak pressure at severe accidents without venting the containment atmosphere to the environment. The PCV pressure can be moderated within the design pressure. Another merit is the capability to submerge the PCV and the RPV above the core level. The third merit is robustness against external events such as a large commercial airplane crash. Both the containments have a passive cooling core catcher that has radial cooling channels. The Mark S containment is made of reinforced concrete and applicable to a large power BWR up to 1830 MWe. The Mark X containment has the steel secondary containment and can be cooled by natural circulation of outside air. It can accommodate a medium power BWR up to 1380 MWe. In both cases the plants have active and passive safety systems constituting in-depth hybrid safety (IDHS). The IDHS provides not only hardware diversity between active and passive safety systems but also more importantly diversity of the ultimate heat sinks between the atmosphere and the sea water. Although the plant concept discussed in the paper uses well-established technology, plant performance including economy is innovatively and evolutionally improved. Nothing is new in the hardware but everything is new in the performance.     

秦山核电厂大修期间辐射源项分析

本文介绍了秦山核电厂大修期间主要系统设备辐射源项的特点,分析了辐射源项的主要核素及影响因素,提出了降低大修作业现场辐射源项的措施。     

浅议秦山核电厂技术改造项目管理之优化

秦山核电厂将技术改造按阶段划分成项目立项阶段、设计和物项采购阶段、施工准备和施工阶段、验收和评价阶段进行管理控制。通过严格控制项目立项,制订技术改造一级网络计划并密切跟踪,定期汇报技改的进展,及时召开技术改造协调会等手段,优化了技术改造的过程。     

槽式太阳能集热发电系统发展状况

本文简要介绍了槽式太阳能集热发电系统的组成、关键技术、国外应用现状及国内研发状况。基于包括槽式太阳能系统在内的太阳能光热发电技术今后必然会在中国得到大力发展这样一个预期,本文作者根据自身的实际工程经验对未来中国的商业化规模的槽式太阳能热发电系统的工程设计提出了自己的建议。     

内陆核电厂冷却塔的环境影响预测计算

内陆核电厂通常采用自然通风冷却塔作为散热系统,电厂余热主要通过冷却水释放到大气环境中,由此带来的环境影响包括雾羽、荫屏、盐沉积、噪声等。本文基于美国核管会(NRC)推荐的SACTI计算程序,给出了评价冷却塔造成上述环境影响的计算模式和方法;采用此程序,对我国湖南、湖北和安徽三个拟选内陆核电厂厂址的冷却塔环境影响进行了预测计算,并与美国GGNS电厂的相关计算结果进行了类比分析。     

Monte Carlo有限元射线追迹法计算圆柱形闪烁体与光纤的耦合功率

本文建立了基于计算机模拟的蒙特卡罗有限元射线追迹法,应用该方法对不同结构尺寸的圆柱型LSO晶体和大芯径光纤耦合输出进行了模拟研究.模拟结果表明:闪烁体半径一定情况下,耦合功率增加的幅度随闪烁体厚度增加呈递减趋势,在闪烁体的厚度达到10 cm时增加闪烁体厚度,耦合功率增加趋于平缓;闪烁体厚度一定的情况下,在闪烁体的半径达到光纤立体角对应的半径后,继续增加半径,耦合功率增加幅度逐渐减少;在闪烁体的入射端面包95%的反射材料后,其耦合功率增加了90%.     

Assessment of thermal aging embrittlement in a cast stainless steel valve and its effect on the structural integrity

This paper analyzes the thermal aging embrittlement occurred in a cast stainless steel valve, which is part of the reactor water clean-up (RWCU) system of a Spanish boiling water reactor (BWR) nuclear power plant. The aim is to estimate the current and future state of the material and the corresponding structural integrity of the valve. Given that there is no data available for the experimental characterization of the material, the evolution of the mechanical properties (fracture toughness, yield stress, flow stress and Ramberg-Osgood parameters) has been estimated using the ANL procedure.With the obtained estimations, the critical crack size has been calculated using the European procedure FITNET FFS and the ASME Code.This analysis considers not only the evolution of the mechanical properties up to now but also its future evolution in case there is a life extension of the plant until year 2029.     

秦山一期核电厂反应堆棒控棒位系统的数字化设计及其可靠性

秦山一期核电厂300 MW反应堆功率棒控棒位系统为模拟仪表控制系统,由于设备老化、维护困难和可靠性下降等原因需要改造.系统改造采用基于CPU冗余、电源冗余和ControlNet现场总线冗余的控制方案.利用PLC控制技术,对其棒控棒位模拟仪表控制系统进行数字化改造设计,克服了系统参数不能实时调整、抗干扰能力差等缺陷,增强了系统的通信能力、集中监控能力及系统可维护性,提高了系统的可靠性和安全性.模块化的程序设计,增强了程序的可读性和实用性,减少了程序扫描时间,保证了系统响应速度.实际反应堆的运行效果验证了设计的合理性.     

华能玉环电厂1000MW机组汽轮发电机基座镜面混凝土施工

从"人、机、料、法、环"5个要素介绍玉环电厂1000MW机组汽轮发电机基座钢筋混凝土的施工工艺.由于科学选择混凝土配合比,改变基础箍筋形式,采用新型模板和建模方式,运用成品塑料垫块和PVC倒角线条以及浇筑方式合理,实现了镜面混凝土效果.