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徐启国 《中国原子能科学研究院年报》2005,(1):22-23
正在建设中的CARR是为了满足21世纪科学技术发展需要而设计建造的。CARR是一座安全可靠、高技术性能、多用途的先进研究堆,它将为中国核科研进一步发展提供一个重要的平台。CARR仪控系统由反应堆保护系统、ATWS系统、核测量系统、反应堆监控系统等组成。这些系统,除了核测量系统基本上还是采用传统的模拟技术外,均采用了计算机技术。 相似文献
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辐射防护监测系统是中国先进研究堆(CARR)的一个重要辅助系统,对系统中燃料破损辐射监测、主控室可居留性辐射监测和烟囱排风辐射监测三方面进行了设计优化。设计优化后的结果是在满足系统功能,把握"安全可靠,经济适用"的原则下,使优化后设计更加符合CARR运行的实际需要。 相似文献
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热工过程测量系统是CARR的一个重要组成部分,是运行人员获取反应堆运行信息、采取适当的安全相关行动、保证反应堆安全运行的重要条件。热工测量系统的安全功能包括:为反应堆数字化保护系统提供热工过程监测信息、为辅助控制点提供必要的热工过程状态信息、为反应堆事故监测系统提供必要的热工过程状态信息等。 相似文献
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介绍VVER-1000型核电厂声学泄漏监测系统的设计基准和功能,给出判断泄漏过程、确定泄漏量和泄漏位置的系统算法。建立主回路声模型结构图,计算得到环路背景噪声分布,并和实际机组上的试验结果进行对比。建立管道模型的试验台架,并对管道模型进行了试验验证。根据试验数据得到用于计算泄漏量大小和泄漏位置的相关系数。通过核电厂声学泄漏监测系统的设计和验证,为开发田湾核电厂1、2号机组在线的核电厂声学泄漏监测系统奠定了基础。 相似文献
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In this paper a mathematical formulation for the air leakage rate through cracks in concrete is given. The formula works well as a good approximation for crack widths up to 1.30 mm and overpressures up to 0.80 MPa. The formula was found by means of systematic air leakage tests using unreinforced test specimens with one “defined single crack”. For thermodynamic formulation, isothermal changes in the gas state during the leakage through the crack was estimated and experimentally proved. By additional leakage tests using reinforced test specimens, practical usability of the leakage formula for reinforced panels with a “typical crack pattern” was checked. 相似文献
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本文对压水堆核电站反应堆冷却剂承压边界(RCPB)泄漏监测的重要性和常用的几种放射性监测方法进行叙述,对这几种监测方法的优缺点进行了比较。重点介绍了一种测定压水堆核电站RCPB泄漏率的~(18)F(氟-18)放射性微尘监测新方法,并对其基本监测原理进行说明。详细阐述了~(18)F微尘监测系统的结构组成、系统设计要求及计算假定条件等内容,同时还对~(18)F微尘监测系统泄漏率探测限进行计算,给出了系统的主要性能指标。 相似文献
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An area that has been identified as significantly important in the development of a High Temperature Reactor (HTR) is the prediction of leakage and bypass flows through such a reactor. It is therefore essential to understand the causes of bypass flows and to determine the effect on the predicted fuel and component temperatures.This paper discusses the identification of leakage flows that are applicable to the Pebble Bed Modular Reactor (Pty) Ltd. (PBMR) design and the ranking of these leakage flows. The modeling methodology and results are also discussed.Similar to previous HTR's, it was found that leakage and bypass flows are important parameters to consider for safe and efficient operation of the PBMR. Through a focused approach, it is shown that PBMR is able to improve the understanding of this phenomenon and quantify the flows and subsequent influence on the operation of the system. This has resulted in a reduction of leakage and bypass from approximately 46% to 20%. The improved understanding of leakage and bypass flows allows PBMR to address this issue during the design phase of the project, which subsequently results in a vast improvement over historical HTR designs. This gives PBMR a distinct advantage over previous High Temperature Reactors. 相似文献
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介绍了核工业西南物理研究院聚变实验增殖堆工程概要设计(FEB-E)中的氚系统设计研究。第一部分介绍包层氚增殖区的划分、几何尺寸、装料特征和用蒙特卡罗程序计算得到的液态锂中的氚浓度分布;第二部分描述根据聚变堆氚物理基础构造的氚循环系统,共分成 10 个子系统及它们之间氚的流程图。运用研制的程序SWITRIM 计算了各个子系统中的氚投料量随时间的变化,满功率运行一年后各个子系统中的氚投料量。研究结果表明起动 143 MW 聚变功率 FEB-E 堆所需要的初始氚投料量大约为 319 g。第三部分对不同的运行状态下的氚泄漏问题进行了分析。潜在的氚泄漏危险可能来自于偏滤器系统从等离子体中抽出的气体。得到的结论是提高FEB-E 堆芯等离子体的燃耗份额从而减少氚的通过量对降低氚的泄漏危险是重要的。 相似文献
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Sliding connections can be used at such positions where gas compartments with different pressures and temperatures must be seperated from each other. These connections should be able to compensate different temperatures during operation and to accommodate axial and angular offsets and vibrations with connecting pipes. Determination of the leakage behaviour and the reliability of the system necessitates design work, computations and experimentation. The functional reliability and approval qualification capability of the system have already been demonstrated with the THTR. The permissible leakage values can be guaranteed for every diameter, based on tested sliding connections up to 3000 mm diameter. The design-determinant influencing parameters have been located. 相似文献
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非放射性气体示踪技术是一种常用的泄漏检测技术,SF6是常用的气体示踪剂。对一些特殊检测场所,如贮存放射性和有毒有害气体的容器的泄漏监测,建立示踪剂在线采样和分析系统十分必要。本文阐述了SF6示踪剂多监测点在线监测系统的设计思路和主要功能模块流程。该系统的样品消耗量小,可通过压力控制减小样品消耗。实验证实,系统运行对色谱基线无影响,同一样品通过不同监测通道在不同时刻的分析结果的相对标准偏差小于1%,不同监测通道样品无交叉污染,采样点的温度、压力监测结果与就地仪表监测精度相当。 相似文献
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Hiroyuki Kogawa Takashi Wakui Takashi Naoe Katsuhiro Haga Hiroshi Takada Masatoshi Futakawa 《Journal of Nuclear Science and Technology》2020,57(5):487-494
ABSTRACTNeutron flux per pulse reached world record at neutron source in Japan Proton Accelerator Research Complex (J-PARC). In the J-PARC, mercury target system is used as a spallation neutron source. A target vessel has a multi-walled protection system that comprises a mercury vessel enclosed with a double-walled water shroud. This is to prevent the leakage of the mercury outside the target vessel. The multi-walled structure needed to be complicated with a lot of welding lines. However, during the operation, we faced an unscheduled shutdown due to water leakage to the intermediate layer between the mercury vessel and water shroud. An investigation on the cause of the leakage was carried out. It is deduced that the leakage path was formed due to the crack propagation from welding defects that are caused by the complicated multi-walled structure. The crack propagation is attributed to the repeated stress by pressure waves generated in the mercury target. Based on the investigation results, the design was improved to remove the welding line on the complicated structure and to realize the stable operation with 1 MW proton beam, which is the final design value of the neutron source in J-PARC. 相似文献