Critical phenomena of a nuclear system in alternative ZM models

Alternative versions of the ZM model are xtended to asymmetric nuclear matter by including ρ meson degree of freedom in the Lagrangian ,The extended models are then used to study the thermodynamical properties of asymmetric nuclear matter at finite temperature.The critical temperature for a liquid-gas phase transition in nuclear matter and its dependence on asymmetry parameter are calculated,The liniting temperature Tlim,which reflects Coulomb instability of hot nuclei,is studied.The calculated results are compared with that given by the original ZM model.     

核动力控制系统连续仿真和离散仿真的研究

分别采用连续时间模型和离散时间模型对一个试验重水反应堆的功率控制系统进行仿真研究,并阐述了如何利用仿真工具分析和改善系统的固有缺陷,使之达到希望的控制效果。     

福清核电厂1、2号机组抗震裕量评价

地震是核电厂主要外部灾害之一,地震风险评估对于核电厂的安全评价具有重要的价值。抗震裕量评价(SMA)是开展核电厂地震灾害风险分析的重要方法之一,其目的是为了判断核电厂的抗震设计能力相对于设计基准地震的抗震裕量,找出核电厂的抗震薄弱环节,提高核电厂的抗震能力。本文针对福建福清核电厂1、2号机组进行抗震裕量评价,分析表明电力支持系统和一回路辅助管道的抗震能力相对薄弱,是导致核电厂抗震能力薄弱的主要原因,电力支持系统和一回路辅助管道需进一步提高其抗震能力,且核电厂需考虑编制地震应急规程。     

核电工程投资与进度集成控制统一编码系统

介绍了国际原子能机构和美国能源经济数据库的核电投资编码系统。在此基础上,为自行开发的核电工程投资与进度的集成控制系统设计了一套统一编码系统。在２００ＭＷ低温供热堆概算系统和投资与进度集成控制系统中的应用表明,该编码系统是可行的而且是有效的。该编码系统还可以进一步用于工程设计,设备材料和文档等方面和管理。     

Design,construction and simulation of a multipurpose system for precision movement of control rods in nuclear reactors

This article presents the design and implementation of a microcontroller-based system for the automatic movement of control rods in nuclear reactors of either power or research types. This system is controlled automatically, is linked to a personal computer system, and has manual controlling ability as well. The important features of this system are: automatic scram of the control rods, activation of alarm in emergency situations, and the ability to tune the control rod movement course both upwards and downwards. In this system, a small tank has been improvised as a coolant reservoir for pool type reactors such as Tehran Research Reactor and its water level is continuously adjusted by special sensors. Also, this system can be applied for controlling various types of control rods such as the regulating rods, safety rods and shim rods; can be connected to all reactor measurement tools and systems such as the period meter, power meter and flux meter; and can receive feedback signals from them. The devised system can be calibrated with these measurement tools by two special potentiometers in the related electronic board. The processes of this system have been simulated by the SIMULINK tool kit of MATLAB software and all responses of the system, including oscillation and transient responses, have been analyzed.     

模糊控制在核子秤系统中的应用研究

讨论了模糊控制在核子秤系统中的应用,表明它在非线性过程、弛豫时间长以及无法用数学方法精确描述的过程控制中具有很大优点,并给出了模糊变量、隶属度函数以及模糊控制规则。最后比较了模糊控制与PID控制的噪声扰动。     

Thermal—hydraulic stability of a natural circulation system with nuclear feedback

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用于核电厂数字化仪表控制系统优化设计的CATIA 2程序的改进

对压水堆核电厂瞬态仿真程序CATIA 2程序进行了改进,以满足核电厂数字化仪表控制系统优化设计工作的需要.主要的改进是在CATIA 2程序中,对ΔT保护通道引入了数字化采样模块模型及数字化处理时间步长,以及对ΔT保护通道所用的输入变量引入了采样时间步长,并针对数字化技术提出了一种新的超温ΔT定值方程模型.通过分析比较数值仿真的结果,表明所做的改进是合理和可行的.     

核电站稳压器水位控制系统数字化的实现及优化方案

根据模拟稳压器水位控制系统结构、功能以及运行原理的分析,展开对稳压器水位控制系统数字化的研究。在选择成熟商用单板机的基础上引入了数/模,模/数转换以及控制算法等实现了稳压器水位控制系统,并和稳压器水位仿真模型构成闭环运行,通过虚拟仪器监测此控制系统的运行情况,证实了本系统达到并超过了原有模拟控制系统的功能和性能。     

La2/3Ca1/3MnO3薄膜结构与输运性质

用磁控溅射方法在不同单晶衬底材料上制备了一系列含La2／3Ca1／3MnO3(LCMO)薄膜。当薄膜厚度大于200A,在我们实验条件下可观测到金属．绝缘体转变,且转变温度随厚度和衬底材料而变化。渗流电阻模型被用来解释薄膜材料的电输运特性,结合薄膜外延特性(晶格失配)和薄膜与衬底的相互作用,及薄膜表面、界面粗糙度的测量可知薄膜的剩余电阻、极化子的激活能、金属．绝缘体转变温度等密切与薄膜质量相关。     

微机核子计量系统多路信号采集/控制卡研制

介绍了最新研制的可用于微机核子计量系统的同时采集32路模拟信号和输出16号控制信号的接口板,及其基本原理和组成结构。     

Role of nuclear energy in environment, economy, and energy issues of the 21st century – Growing energy demand in Asia and role of nuclear

The economic growth of recent Asia is rapid, and the GDP and the energy consumption growth rate are about 8–10% in China and India. The energy consumption forecast of Asia in this century was estimated based on the GDP growth rate by Goldman Sachs. As a result, about twice in India and Association of South East Asian Nations (ASEAN) and about 1.5 times in China of SRES B (Special Report on Emission Scenarios) are forecasted. The simulation was done by Grape Code to analyze the impact of energy increase in Asia. As for the nuclear plant in Asia, it is expected 1500 GWe in 2050 and 2000 GWe in 2100, in the case of the environmental constrain. To achieve this nuclear utilization, there are two important aspects, technically and institutionally.

A. Development of the CANDLE core and/or the Breed and Burn core.

B. The establishment of the stable nuclear fuel supply system like “Asian nuclear fuel supply organization”.

核电站整体实验回路PMK-NVH装置模拟的小破口失水事故的分析计算

一、前言核电站的假想小破口失水事故是核电安全热工水力分析的一个重要方面,特别是在美国三里岛事故后,更加引起人们的重视。在国际原子能机构的组织下,作者根据匈牙利科学院提供的资料,使用核电安全分析     

Multiobjective optimization of the inspection intervals of a nuclear safety system: A clustering-based framework for reducing the Pareto Front

In this paper, a framework is developed for identifying a limited number of representative solutions of a multiobjective optimization problem concerning the inspection intervals of the components of a safety system of a nuclear power plant. Pareto Front solutions are first clustered into “families”, which are then synthetically represented by a “head of the family” solution. Three clustering methods are analyzed. Level Diagrams are then used to represent, analyse and interpret the Pareto Fronts reduced to their head-of-the-family solutions. Two decision situations are considered: without or with decision maker preferences, the latter implying the introduction of a scoring system to rank the solutions with respect to the different objectives: a fuzzy preference assignment is then employed to this purpose.     

基于Labwindows/CVI的氡室测控系统设计

针对目前氡室测控系统存在的问题，本文提出了基于CMOSense技术的SHT75数字式温湿度传感器和LaWindows／CVI虚拟仪器开发环境的设计思想。运用虚拟仪器本身提供的库函数、数据库技术和模块化的设计思想开发了氡室测控系统。该系统很好地完成了氡室里重要参数的实时全程控制，并且具有显示直观、反应迅速，性价比高等特点，因此具有一定的使用价值。     

Electronic excitation effects in CeO2 under irradiations with high-energy ions of typical fission products

In order to understand the formation mechanism of a crystallographic re-structuring in the periphery region of high-burnup nuclear fuel pellets, named as “rim structure”, information on the accumulation process of radiation damage and fission products (FPs), as well as high-density electronic excitation effects by FPs, are needed. In order to separate each of these processes and understand the high-density electronic excitation effects, 70–210 MeV FP ion (Xe^10–14+, I⁷⁺ and Zr⁹⁺) irradiation studies on CeO₂, as a simulation of fluorite ceramics of UO₂, have been done at a tandem accelerator of JAEA-Tokai and the microstructure changes were determined by transmission electron microscope (TEM). Measurements of the diameter of ion tracks, which are caused by high-density electronic excitation, have clarified that the effective area of electronic excitation by high-energy fission products is around 5–7 nm  and the square of the track diameter tends to follow linear function of the electronic stopping power (S_e). Prominent changes are hardly observed in the microstructure up to 400 °C. After overlapping of ion tracks, the elliptical deformation of diffraction spots is observed, but the diffraction spots are maintained at higher fluence. These results indicate that the structure of CeO₂ is still crystalline and not amorphous. Under ion tracks overlapping heavily (>1 × 10¹⁵ ions/cm²), surface roughness, with characteristic size of the roughness around 1 μm, is observed and similar surface roughness has also been observed in light-water reactor (LWR) fuels.     

Study of the deuterated titanium Ti2Hx sample by using nuclear reaction analysis and material analysis methods

Titanium is one of the best hydrogen loading material.The predicted maximum loading ratio of hydrogen in titanium may reach to 2.0.In this work.a titanium layer on molydbenum substrate was deuterated with the atomic ratio X=^2H/Ti≥1.6,The change of the surface topography and microstructure of the sample before and after lading was observed by using Scan Electron Microscopy (SEM),The surface segregation of the samples after deuteron bombardment was also observed.A fluctuatingly-incrcasing trend of the deuterium density in titanium target was detected in the deuteron implantation experiments.which indicated a suddenly explosion(segregation)or fast diffusion of deuterium in the titanium.Significant amount of nitrogen contamination was found in the Ti^2Hx sample by nuclear reaction analysis(NRA),which indicated that the Ti^2Hx structure might have the feature to trap nitrogen from air.The nitrogen contamination in Ti^2Hx significantly affects the increase of the atomic ration X=^2H/Ti.     

3Gyγ射线照射和丝裂霉素C对大鼠肝脏细胞色素P450 含量及其同工酶CYP2B1、CYP2E1活性的影响

为研究3Gyγ射线全身照射和丝裂霉素C（Mitomycin C，MMC）对雄性（Sprague-Dawley，SD）大鼠肝脏细胞色素P450含量、CYP2B1、CYP2E1活性的影响，分别给大鼠腹腔注射1mg／kgd的MMC（分1d，连续3d及6d用药三组），3mg／k的MMC 1d，3Gyγ射线全身照射，3Gyγ射线全身照射加1d3mg／kg MMC，另设空白对照和溶剂对照。各组处理结束后24h，处死大鼠取肝脏，制备微粒体，测P450含量、CYP2B1、CYP2EI活性。实验结果表明，给MMC 1mg／kgd，1d后P450含量、CYP2B1活性变化无统计学差异（p〉0．05），CYP2E1活性明显上升（P〈0．01）；连续3d或6d后，P450含量、CYP2B1、CYP2E1活性均无明显变化（P〉0．05）。给3mg／蟾的MMC 1d，对P450含量、CYP2B1活性影响无统计学差异（P〉0．05），CYP2E1活性上升明显（P〈0．01）；3Gyγ射线全身照射后，P450含量、CYP2B1活性无明显变化（P〉0．05），CYP2E1活性下降（P〈0．05）；分析发现，3mg／kgMMC与3Gyγ射线之间没有交互作用。结果提示，Y射线可以抑制雄性SD大鼠肝脏CYP2E1活性，MMC对CYP2E1活性有诱导作用，但多次刺激使其耐受，P450含量、CYP2B1活性对γ射线、MMC不敏感。     

田湾核电厂TXP/TXS系统的数据通信

介绍了田湾核电厂TXP/TXS系统数据通信软硬件设计的主要特点.对数据通信软硬件结构的详细分析表明,田湾核电厂TXP/TXS系统数据通信具有单一故障容错、高度的可靠性和可利用性等优点,满足了核电厂对数据通信高度可靠的要求.