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本文叙述了反应堆保护系统停棒与汽轮机降功率子系统的系统功能、保护参数和秦山核电站控制棒组插入监测器的设计与参数选择,确定了控制棒提升上极限值和在不同工况下棒插入低位、低-低位整定值,并在热态零功率条件下加以验证。试验证明参数选择是合理的,为功率运行阶段提供了数据。 相似文献
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为提高200MW低温核供热堆经济性,对控制棒结构进行优化设计。在新的控制棒方案中,将控制棒驱动缸移到堆芯活化区以上,控制棒由浮动式活塞带动上下移动。由于驱动缸移出堆芯,燃料组件排布不再缺角,减小了堆的水铀比和堆内的中子吸收,增加了堆的运行时间。适当地加大驱动缸的直径和壁厚,有效降低了制造难度,提高了控制棒运行的可靠性。通过数值计算,分析了上置式水力驱动控制棒的落棒时间。 相似文献
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本文介绍了秦山一期棒控棒位系统数字化设计,包括系统主要功能、系统结构、软件设计流程,以及触摸屏的设计等.详细论述了软件设计调试过程中碰到的一些问题,分析问题并给出相应的解决方法. 相似文献
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动力堆的年非计划停堆次数是衡量其运行性能的一个重要指标。控制棒水力驱动系统是核供热堆的关键系统之一 ,其运行失效将直接导致供热堆的非计划停堆。运用故障树分析的方法 ,建立以“控制棒非计划下落”为顶事件的故障树 ,分析计算系统各组成单元失效造成控制棒下落、引起非计划停堆顶事件的发生概率 ,并从提高系统运行可靠性的角度出发 ,根据故障树分析的结果 ,提出设计改进意见。 相似文献
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The dropping time and profile of control rods are important parameters during the safety evaluation of nuclear power plants. CFD method and dynamic mesh were used to study the dropping profile of the control rod and flow evolution. The changes of displacement, velocity and acceleration versus time during the dropping of the control rod are obtained. Meanwhile, the effect of the deformation of the control rod and channel on the control rod dropping is evaluated. The results of the work are of help to the design and optimization of the structure of control rods. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(11):1143-1150
A cell calculation method has been developed for accurately treating neutron transport and heterogeneity effects of control rods (CRs) within the bounds of homogeneous neutron diffusion theory. In this method, CR cell-averaged homogeneous neutron cross sections are calculated by a heterogeneous neutron transport calculation with an annular supercell model, in which a CR assembly is surrounded by a homogeneous fuel region. Then, a neutron diffusion calculation is carried out using the homogeneous neutron cross sections in the same supercell, and the CR cell-averaged radial neutron diffusion coefficients are modified in an iterative manner such that the CR cell-interface neutron current which is obtained by the heterogeneous transport calculation can be reproduced by the homogeneous diffusion calculation. In the case of a 1,000-MWeclass FBR, the center CR worth, which was calculated by an RZ diffusion calculation using the cross sections obtained by the above method, agreed within 1% with that obtained by a heterogeneous transport calculation, proving the validity of the method. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(10):516-528
A new method of calculating the worth of cruciform control rods arranged in the D-lattice is presented. The lattice is divided into two regions: a transport region near the control rods, and a diffusion region removed from the rods. The neutron behavior in the former region is treated by collision probability method and in the latter by diffusion approximation. The prompt decay constants calculated by the present method are in very good agreement with experimental data, which evidences the accuracy of the present method for evaluating cruciform control rod worth. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(8):745-751
In a High Conversion PWR (HCPWR), the neutron spectrum is hardened in comparison with the conventional PWR and the nuclear characteristics of the control rod is much different. We have calculated the control rod worth in a HCPWR for several materials of strong neutron absorbers and selected B4C for the control rod material. For the B4C control rod, we have investigated the various nuclear characteristics such as the spatial and energy dependency of neutron absorption, the dependency of the control rod worth on moderator to fuel volume ratio and Pu enrichment etc., and obtained the useful data for the nulear design of control rods in a HCPWR. 相似文献
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秦山核电二期工程棒控棒位系统设计 总被引:4,自引:0,他引:4
介绍了秦山核电二期工程国产化棒控、棒位系统的主要功能、设计过程,设备制造以及设备的安装与调试等过程,取得的经验和解决的问题或需要完善的地方.通过现场调试和试验运行表明,系统和设备都达到了设计要求和指标.功能正确,电流波形好,满足了秦山核电二期工程的要求.同时为将来新电站国产化棒控、棒位系统的设计和设备提供了宝贵的经验和可鉴之处. 相似文献
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西安脉冲堆控制棒驱动机构采用步进电机作为执行部件,与其相适应的控制棒控制系统采用了单片机芯片电路和大功率VMOS管,控制棒位置探测器显示系统采用接近开关和数字显示。经综合试验和堆上运行考验证明,该系统设计合理、性能良好、精确度高,具有很好的推广价值。 相似文献
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压水堆控制棒价值误差分析 总被引:1,自引:0,他引:1
压水堆启动物理试验时,控制棒价值是比较容易超限的一个参数.本文系统分析了影响控制棒价值计算值与测量值偏差的主要因素以及各因素的影响特点、大小,并给出了部分实例分析,以期降低控制棒价值的误差,减少因控制棒价值超差对启动物理试验带来的不利影响,并在控制棒价值超差原因分析时提供帮助.分析表明,为降低控制棒价值误差,需要建立精确、合理的反射层模型,尽可能采用燃料组件的制造参数,控制棒的计算方法要考虑试验方法与工况;将注量率图试验结果、硼浓度和其他堆芯参数与控制棒价值误差分布特点相结合,进行原因查找. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(12):1289-1293
A simplified mathematical model was developed for the Hydraulic Control Rod Driving System (HCRDS) of a 200 MW nuclear heating reactor, which incorporated the design of its chamfer-hole step cylinder, to analyze its seismic response characteristics. The control rod motion was analyzed for different sine-wave vibration loadings on platform vibrator. The vibration frequency domain and the minimum acceleration amplitude of the control rod needed to cause the control rod to step to its next setting were compared with the design acceleration amplitude spectrum. The system design was found to be safety within the calculated limits. The safety margin increased with increasing frequency. 相似文献