HTR-10一回路氦气泄漏率测量方法研究

本文详细介绍了测量HTR-10一回路氦气泄漏率的两种方法--直接测量法和存量衡算法,针对HTR-10一回路参数多变的特性,讨论分析了直接测量法的实用性,并提出了在计算压力壳内氦气平均温度时使用经验公式的方法.结合实际运行参数,分别使用两种测量方法得到的氦气泄漏率的最大相对误差为5.7%,证明了用直接测量法可以准确得到HTR-10一回路氦气的泄漏率,能够以直接测量法得到的测量结果为依据连续监测一回路氦气每天的泄漏量是否小于一回路却剂系统中总氦量的1%.     

高温氦气实验回路氢气主冷却回路的概念设计

依据聚变堆包层热工水力实验段的设计要求,并借鉴国内外氦气实验回路的设计和运行经验,对国际热核聚变实验堆(ITER)氦冷固态增殖剂实验包层模块(HCSB-TBM)高温氦气实验主回路进行了概念设计.主要给出了氦气实验主回路(HTHEL)的主要设计参数、回路系统构成及主要设备特点,并对主管道设计进行了应力校核.     

核电厂蒸汽发生器传热管氦气检漏系统研究

本研究介绍了某核电厂蒸汽发生器传热管在役氦气检漏系统的原理及系统组成,并模拟了某核电厂蒸汽发生器在役大修期间传热管检漏试验。试验结果表明,最佳参数可设置为:蒸汽发生器二次侧氦气浓度份额为30%;抽气速率为 20 L/min;蒸汽发生器二次侧压力为0.6 MPa;系统漏点定位误差在0.5 m以内。本文研究的蒸汽发生器传热管在役氦气检漏系统可为国内核电厂安全、稳定地运行提供可靠的技术保障。      

中国先进研究堆冷中子源设备冷却水回路系统验收试验

正中国先进研究堆(CARR)冷中子源系统中设备冷却水回路系统为确保堆外氦制冷回路正常运行的保障系统,它是重要回路之一。冷中子源系统中氦制冷回路系统运行时,系统内压缩机和冷箱中的透平膨胀机因发热而需要冷却,其冷却源来自设备冷却水系统,以维持其机体在合适的温度范围内。设备冷却水回路系统验收试验包括:系统回路水压力试验;回路装置密封性试验;回路系统不带负荷运转试验;回路系统带负荷运转试验。系统回路水压力试验针对全冷却回路,包括压缩机、冷箱供水管路、换热器、冷却泵以及相关阀门仪表和接口,采用水为介质,打压方案为通过排水     

核电厂放射性贮存池钢覆面检漏系统关键设计参数分析与研究

检漏系统是长期放射性贮存池钢覆面的重要组成部分。为确定检漏系统的关键设计参数,采用风险分析、流体力学理论计算等方法开展分析研究,并基于某三代核电厂乏燃料水池钢覆面检漏设计开展实证分析,确定了乏燃料水池钢覆面检漏系统的检漏回路数量、最大泄漏量、检漏管道坡度和响应时间。同时,通过与乏燃料水池冷却和处理系统的设计补水能力及液位报警情况进行比对,结果表明乏燃料水池工艺设计上留有充足裕量。     

氦检漏技术在核电站蒸发器传热管密封性试验中的应用

蒸汽发生器传热管氦检漏技术,是20世纪80年代法国电力公司(EDF)开发的一种用于检测蒸汽发生器传热管密封性能的新技术,目前该技术已应用于EDF旗下核电站的蒸汽发生器。但是国内某核电站所用的60F型蒸汽发生器在结构上存在差异,本文以该型蒸汽发生器实施的氦检漏试验为例,简要介绍了蒸汽发生器氦检漏的工作原理和步骤、详细描述了该型蒸汽发生器结构上的差异,以及试验过程中出现的问题;总结提炼了相应的解决方法,为同型蒸汽发生器传热管密封性试验提供了经验。     

凝汽器检漏架频繁触发报警问题分析和处理

核电厂凝汽器发生海水泄漏会使二回路凝结水中进入不挥发性盐,高浓度杂质会增加蒸汽发生器传热管腐蚀。凝汽器检漏架用于监测凝汽器是否存在海水泄漏,当海水发生泄漏时凝汽器检漏架能够在第一时间触发报警并确定泄漏点大概位置,缩小后续人员排查漏点范围,节约排查时间,及时消缺。福建福清核电厂2号机组自商运以来1号检漏架频繁触发报警,干扰主控操纵员对机组状态的正确判断,影响机组的安全稳定运行。文章分析了1号检漏架频繁触发报警的主要原因,并给出了应对措施;且此问题普遍存在于M310型压水堆,谨以此文供其他同类型电厂参考。     

秦山核电站蒸汽发生器的氦质谱检漏技术

介绍了核电站蒸汽发生器管子-管板焊缝的氦质谱检漏及总漏率测试方法的研究及为提高检测灵敏度所采取的措施。获得了单管检漏的系统最小可检灵敏度为10~(-8).L/s;总漏率测试系统的灵敏度为10~(-7)Pa.L/s的好结果。为核电站蒸汽发生器建造质量的鉴测提供了可靠的技术保证,也为大容器压力设备的检漏提供了好的方法。     

秦山核电站蒸汽发生器的氦质谱检漏技术

介绍了核电站蒸汽发生器管子-管板焊缝的氦质谱检漏及总漏率测试方法的研究及为提高检测灵敏度所采取的措施。获得了单管检漏的系统最小可检灵敏度为10~(-3)PaL/s;总漏率测试系统的灵敏度为10~(-7)PaL/s的好结果。为核电站蒸汽发生器建造质量的鉴测提供了可靠的技术保证,也为大容器压力设备的检漏提供了好的方法。     

蒸汽发生器传热管氦检漏定量定位技术分析及验证

蒸汽发生器传热管氦检漏是核电厂蒸汽发生器重要检查项目.本文针对蒸汽发生器传热管氦检漏漏点定量定位分析提出了一套算法理论,并通过试验平台进行试验,验证了算法的准确性,为漏点分析提供了可靠的理论依据.     

Tectonic Factor in the Formation of the Radon Fields in the Atmosphere of the Tashkent Subway

Using the standard radiometers -GUARD PQ2000M and gamma-TRACER (Germany) and semiconductor spectrometers RATON (Uzbekistan), the radon fields were investigated in underground service enclosures and on the platforms of the Tashkent subway stations located on territories with different geotectonic characteristics. It is shown that the tectonic factor influences the formation of radon fields in the air in the subway station. 4 figures, 1 table, 7 references.     

氡室平衡状态对监测曲线的影响及修正

氡在氡室中是一种动态稳定状态,为了更准确的监测氡室中氡浓度的变化,文章主要对氡室首次补氡期间氡及子体的平衡状态的变化进行理论推导和平衡系数对FD125监测曲线的影响进行了探讨并进行了修正,取得了比较好的效果,为氡室氡浓度监测曲线修正提供了一种方法.     

On the use of the conjugate gradient method for the solution of the neutron transport equation

The possibility of using the standard conjugate gradient (CG) method to directly solve the S_n-equations based on the diamond difference scheme is studied for mono-energetic neutron transport problems with isotropic scattering. It is shown that such a direct use is possible for practical heterogeneous problems with a significant speed-up over the conventional source iteration (SI) method except for the problems that are prone to unphysical negative fluxes. Some recipes are suggested to make use of the CG-method even in those cases which need negative flux fix-up in the SI-method. The transport synthetic acceleration scheme, recently developed by Ramone [Nucl. Sci. Eng. 125 (1997) 257] and others, is shown to be useful in such cases. A symmetrisation scheme for the coefficient matrix has also been presented to enable the use of the CG-method. This scheme is compared with another approach of using weighted inner products.     

The research about the time-effect of the wettability on the wool surface treated by the Ar plasma jet in the atmospheric pressure

A facility which is called atmospheric pressure and normal temperature plasma jet was introduced in this paper. After the wool surface was treated by this kind of facility with Ar in different irradiating times, the time-effect of the fabric wettability has been weakened, and if the parameters of the irradiating time and the voltage of the facility are appropriate, the time-effect of wettability can be effectively inhibited. With the stable wettability, the fabric can be dressed without PVA (polyvinyl alcohol) which can cause lager pollution in the textile field, so the method without the time-effect of the textile wettability will be useful in the field of clean textile production. Undoubtedly, the stable wettability of textile surface was caused by the stable hydrophilic molecules on the textile surface. Thus, the reaction process and results on the textile surface treated by plasma needs to be studied to optimize the parameters of the irradiating time and the voltage of the plasma jet. So the initial experimental studies on the optimization of the parameters of the plasma jet were discussed in this paper, and the authors believe that the method without the time-effect also can be used in other fields of plasma application.