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中国实验快堆(CEFR)是钠冷快中子反应堆,其一、二回路的运行特性对反应堆的安全运行具有重要的影响。使用JTopmeret软件建立CEFR一、二回路主冷却系统和蒸汽发生器(SG)的仿真模型,用于计算系统任意一点的流量、压力、温度等运行参数。在稳态及瞬态工况下,系统主要参数仿真值与设计值的误差均小于2%,满足系统仿真的精度要求。 相似文献
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堆芯围桶开孔是中国实验快堆(CEFR)事故余热排出系统的重要组成部分之一,是保证该系统形成自然循环排出反应堆事故后剩余发热的关键环节。本文应用通用计算流体力学软件CFX对CEFR堆芯围桶开孔对反应堆正常运行工况的影响进行了模拟,计算了在正常工况运行时,CEFR的反射组件与屏蔽组件热功率对堆芯围桶开孔附近温度场以及流场的影响,给出了堆芯围桶开孔区域的三维温度场、三维流场以及压力分布矢量图。结果表明,目前的设计在满足事故余热排出的要求同时,对反应堆正常运行工况的影响是可以接受的。 相似文献
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OASIS是一个快堆系统安全分析程序,它既可用来分析整个快中子反应堆各系统的稳态与各种瞬态特性,也可用来模拟反应堆控制与调节系统,从而可对中国实验快堆的各种运行工况和事故工况进行宏观分析和研究。OASIS程序前身是已经应用于法国超凤凰的反应堆和凤凰反应堆安全分析的DYN2B程序。 相似文献
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《中国原子能科学研究院年报(英文版)》2018,(0)
正中国实验快堆(CEFR)热功率为65 MW,试验发电功率为20 MW,首炉燃料使用UO2,采用堆本体池式结构和钠-钠-水三回路热传输系统,并首次设立独立的非能动事故余热排出系统。2018年反应堆处于冷停堆运行状态,继续进行大修遗留工作及大修调试工作,完成系统恢复与功能鉴定,完成3次开堆前检查和常规岛热态运行,对开堆强相关项进行处理和验证,实现冷停堆运行工况下的全厂安全稳定运行。 相似文献
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B. N. Laskorin V. S. Ul'yanov R. A. Sviridova A. M. Arzhatkin A. I. Yuzhin 《Atomic Energy》1961,7(2):620-625
Chromatographic methods of separating elements with very similar properties have now been developed. However, a number of these methods are difficult to use industrially as their throughput is low. The efficiency of chromatographic separation methods could be increased considerably by using appropriate complex formers, which decrease the effective concentration of the ions being separated, and,in the first approximation, this is equivalent to a decrease in the amount of elements being separated. The difference in the formation constants of the complex compounds increases the separation coefficient. By investigating chromatographic separation with the use of various complex formers, we found the optimal conditions for separating barium and radium, zirconium and hafnium, and aluminum and gallium. The throughput of these methods, with respect to the macroelement was 15–60 kg/hr per m2 of column cross section. 相似文献
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随着核与辐射技术在医学检查、诊断和治疗领域运用的增加,世界范围受照人群不断增多,医源性辐射已成为人类最主要的人工辐射来源之一。医疗机构和个人在选择利用放射手段获取诊断和治疗利益的同时,需要注意和防护伴随的辐射损伤效应。本文介绍了医源性辐射及其危害、机体组织的辐射损伤特性和类型、辐射生物效应分子及效应调节研究的进展,简要概述目前临床已经使用或最具应用潜力的辐射防护策略。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(4):284-291
The selective removal and fixation of Cs and Sr have been studied in zeolite A and chabazite. Cesium ion was preferentially distributed into chabazite with a high distribution coefficient (K Cs>103 cm3·g?1) in the presence of NaCl (10?1 mol·dm?3). The K Sr values for zeolite A attained about 103 cm3·g?1 in the pH range of 8~10, and they gradually decreased with an decrease in pH. The initial rate of Cs adsorption was fairly fast in chabazite, and the adsorption ratio reached almost 100% within a few hours. The adsorption ratio of Sr in binderless A zeolite reached almost 100% after 15 h. The adsorption of Cs and Sr on these zeolites was followed by Langmuir-type isotherm. Cesium forms of these zeolites recrystallized to pollucite (CsAlSi2O6) above 900°C for zeolite A and above 1,200°C for chabazite. As for Sr forms, these zeolites changed to SrAl2Si2O6 above 900°C. These recrystallized phases were suitable hosts for the immobilization of Cs and Sr in the nuclear waste solutions. 相似文献
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清洁解控和退役若干动向与新发展 总被引:2,自引:0,他引:2
对国际辐射防护协会第 1 0届大会 ( IRPA-1 0 )涉及的清洁解控和退役问题作了论述 ,包括排除、豁免、清洁解控和废物最少化 ;退役工程技术的发展 ,包括去污技术、切割解体技术、探测技术 ;介绍了一个研究堆退役例子和加速器退役 ;最后 ,还论及了退役中受关注的一些问题 ,如 :石墨废物、混凝土废物、重水堆退役的氚防护、退役时间和退役废物量等。 相似文献
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A. Chrysochoos O. Maisonneuve G. Martin H. Caumon J.C. Chezeaux 《Nuclear Engineering and Design》1989,114(3)
This paper depicts one theoretical and experimental method to take into account the energy phenomena, associated with the elasto—plastic deformation process, during the elaboration of behaviour laws. The energy balance definition is examined in order to relate the stored energy of cold work to the hardening state variables. Two experimental approaches are used to study the evolution of the energy balance. The first one uses microcalorimetric technique and the second infrared technique. Several industrial metallic materials are studied by both approaches. Energy data are used to control the validity domain of the classical behaviour laws and to elaborate new more appropriate ones. Therefore, the hardening parameters cannot be identified with the thermodynamical forces. The use of energy considerations allows the definition of new thermodynamical forces and state variables, in the case of isotropic or kinematical hardening. 相似文献
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Hui-Wen Huang Author Vitae Chunkuan Shih Ming-Huei Chen 《Nuclear Engineering and Design》2009,239(6):1136-1147
This work developed an advanced boiling water reactor (ABWR) feedwater pump and controller model, which was incorporated into Personal Computer Transient Analyzer (PCTran)-ABWR, a nuclear power plant simulation code. The feedwater pump model includes three turbine-driven feedwater pumps and one motor-driven feedwater pump. The feedwater controller includes a one-element/three-element water level controller and a specific feedwater speed controller for each feedwater pump. The performance tests, including step change of dome pressure, feedwater pumps transfer, inadvertent closure of all turbine control valves, and one feedwater pump trip at 100% power, demonstrate the feasibility of dynamic response of stand-alone model and incorporated model. Furthermore, a diversity and defense-in-depth analysis is performed to demonstrate the feasibility for motor-driven feedwater pump as an emergency core cooling system (ECCS) automatic diverse back-up. In Lungmen nuclear power plant (NPP), a diverse manual initiation means for the high pressure core flooder (HPCF) loop C is designed as the back-up of digitalized engineered safety features actuation system (ESFAS). If the motor-driven feedwater pump (MDFWP) can be an automatic digital diverse back-up for ESFAS, Lungmen NPP would be more robust to defend against software common-cause failure (CCF). 相似文献
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Past experience with small and medium power reactors (SMPRs) in the areas of construction and operation is examined in this paper. Current development of SMPRs focuses on passive safety features; larger design and safety margins; reduction of construction periods through simplification, modularization and increased shop fabrication. 相似文献