RIA技术在学生宿舍管理系统中的应用研究

文章研究了Flex开发中常用的Remoting通信技术及Flash流媒体服务器技术,Java EE开发中常用的Spring与Hibernate框架,在此基础上,以RIA开发技术为基础,结合学生宿舍管理的实际需求,应用Flex、Spring及Hibernate开发技术,结合远程对象、数据库和Flash流媒体服务器等技术,采用B/S架构设计并实现一个功能完善、灵活性强、实用性强及界面美观的学生宿舍管理系统。该系统的上线,可减轻高校后勤人员、宿舍管理人员的工作负担,提高他们的工作效率。     

基于Flex与ArcGIS Server的全景地质信息系统的设计与实现

针对目前网络地质研究局限于2维的现状,基于Flex、ArcGIS Server等关键技术设计并实现了REST式的兴城全景野外地质信息系统。应用结果表明:系统能够为地质研究人员提供露头-手标本尺度的地质构造、岩石组成和结构构造方面的信息,提高了研究效率;基于Flex的富客户端的应用程序执行速度快、功能丰富、交互性强。     

Thresholds for failure of high-burnup LWR fuels by Pellet Cladding mechanical interaction under reactivity-initiated accident conditions

ABSTRACT

To contribute to the future updating on the Japanese safety criteria for pellet/cladding mechanical interaction (PCMI) failure of light water reactor fuels under reactivity-initiated accident (RIA) conditions, this paper summarizes the recent important outcomes from research programs with the Nuclear Safety Research Reactor (NSRR). Applicability of current criteria, which are defined as a function of fuel burnup and possibility of introducing another parameter for new criteria were evaluated based on the results of the RIA-simulated pulse irradiation tests, post-test examinations, and supporting analytical work, such as the reevaluation of fuel enthalpies in earlier NSRR experiments. Failure-threshold curves based on cladding hydrogen content as a primary measure of fuel degradation have been proposed as a possible alternative that can be used to judge the occurrence of PCMI failure to ensure conservativeness in a more pertinent manner.     

Zircaloy-U02 and -Water Reactions and Cladding Temperature Estimation for Rapidly-Heated Fuel Rods under an RIA Condition

Zircaloy cladding chemical reactions with coolant water and UO₂ fuel at elevated temperatures under a reactivity initiated accident (RIA) condition were studied from a metallurgical point of view on the basis of the nuclear safety research reactor (NSRR) experiments. The cladding-fuel chemical reaction was extensively analyzed and found to be explainable from equilibrium phase diagrams. The systematic estimation methods of maximum cladding temperature were proposed and examined from metallographies. Maximum cladding temperature can be estimated from measured oxidation thicknesses in the temperature range of 1,000~1,600°C, from melting microstructures in the range of 1,600~1,950°C and also from the volume fraction of the precipitates, (U, Zr)0_2-x, in once-molten oxygen-stabilized α-zircaloy in 1,950~2,400°C. The estimation by the method proposed in the paper is more valid than thermocouple indications at high temperatures, since thermocouples perturb the temperatures they are measuring or fail at the extremely high temperatures. The results are thought to be applicable also to understand general fuel rod behavior under hypothetical accident conditions which cause severe fuel damage.     

Influence of Cladding-Peripheral Hydride on Mechanical Fuel Failure under Reactivity-Initiated Accident Conditions

In order to investigate the influence of hydrogen embrittlement on fuel failure under reactivity-initiated accident (RIA) conditions, pulse irradiation experiments were performed with unirradiated fuel rods at the Nuclear Safety Research Reactor (NSRR). Fresh cladding was pre-hydrided so that the other factors of cladding degradation, such as irradiation damage and oxidation, were excluded. Hydride clusters are circumferentially oriented and localized in the cladding periphery in order to simulate ‘hydride rim’ which is formed in high burnup PWR cladding. The present study demonstrated hydride-assisted pellet-cladding mechanical interaction (PCMI) failure which has been observed in high burnup fuel experiments. The fuel enthalpy at failure was lower when the cladding had a thicker hydride rim where surface cracks were easily generated. It indicates that the failure limit is highly correlated with the stress intensity factor assuming that the crack depth is equivalent to the hydride rim thickness. Hence, we conclude that hydride rim formation is the primary factor of decreasing the failure limit for high burnup fuels. Based on the experimental results together with an analysis on cladding mechanical state during PCMI, the present study suggests a process of through-wall crack generation which is originated with brittle cracking within the hydride rim.     

A review on the clad failure studies

In this paper, an attempt has been made to systematically organize the research investigations conducted on clad tube failure, so far. Before presenting the review on the clad failure studies, an introduction to different clad materials has been added, in which the effect of alloying elements on the material properties have been presented. The literature on clad failure has been broadly categorized under the headings LOCA and RIA. The failure mechanisms like creep, corrosion and pellet-clad interaction have been discussed in details. Each subsection of the review has been provided with summary table, in which the studies are arranged in the chronological order. A small section on acceptance criteria for ECCS has also been included. The last section of the review has been dedicated to the core-degradation phenomena.     

Enhancing TRU burning and Am transmutation in Advanced Recycling Reactor

This paper presents about conceptual designs of Advanced Recycling Reactor (ARR) focusing on enhancement in transuranics (TRU) burning and americium (Am) transmutation. The design has been conducted in the context of the Global Nuclear Energy Partnership (GNEP) seeking to close nuclear fuel cycle in ways that reduce proliferation risks, reduce the nuclear waste in the US and further improve global energy security. This study strives to enhance the TRU burning and the Am transmutation, assuming the development of related technologies in this study, while the ARR based on mature technologies was designed in the previous study. It has followed that the provided TRU burning core is designed to burn TRU at 28 kg/TW_thh, by adding moderator pins of B₄C (Enriched B-11) and the Am transmutation core will be able to transmute Am at 34 kg/TW_thh, by locating Am blanket of AmN around the TRU burning core. It indicates that these concepts improve TRU burning by 40-50% than the previous core and can transmute Am effectively, keeping the void reactivity acceptable.     

基于RIA技术的WebGIS应用开发

由于传统Web技术在构建WebGIS系统时的局限性,文中提出基于RIA技术构建WebGIS的可行性和优越性。进而介绍RIA、Silverlight及REST架构等技术背景,分析RIA环境下地理信息组织结构、存储方式及缓存池等关键技术。并且实现一个WebGIS应用——全国民用机场天气状况查询系统,阐述了该系统的实现思路及重要细节。试验表明,RIA技术是构建富体验WebGIS的有效方式。     

基于RIA技术的WebGIS应用开发

由于传统Web技术在构建WebGIS系统时的局限性,文中提出基于RIA技术构建WebGIS的可行性和优越性。进而介绍RIA、Silverlight及REST架构等技术背景,分析RIA环境下地理信息组织结构、存储方式及缓存池等关键技术。并且实现一个WebGIS应用——全国民用机场天气状况查询系统,阐述了该系统的实现思路及重要细节。试验表明,RIA技术是构建富体验WebGIS的有效方式。     

一种创新型的校企合作模式

文章针对计算机专业被亮为红牌专业的问题,提出一种创新型课程教学模式的理念,并结合最新的RIA应用特点,分别从教学内容、教学模式、考核方式3个方面,对如何具体实施创新型课程教学模式进行详细论述。