共查询到20条相似文献,搜索用时 62 毫秒
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反应堆物理试验中需进行反应性测量,为了测量反应性,研制了基于逆动态法原理的可消除空间效应的便携式数字反应性仪。详细叙述了数字反应性仪的物理模型、硬件设计、软件设计、动态跟踪法和可消除空间效应的落棒法测量模式以及堆上考验试验情况。 相似文献
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为了定量确定零功率物理试验功率的上限,在反应堆零功率物理试验中,利用数字反应性仪测量多普勒发热点,以确定试验功率的范围、保证试验精度。叙述了本次多普勒发热点测量试验的原理、试验仪器、试验方法、试验结果及数据处理方法等,试验结果表明:利用数字反应性仪测得的反应性经过修正后可以准确地判断多普勒发热点,可为后续物理试验提供参考。 相似文献
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相比于传统的反应堆控制棒价值测量方法,快速的动态棒价值测量方法要求反应性测量设备具有更高的精度和性能,以准确获取和处理堆外探测器的电流信号,并需通过额外的堆芯中子学计算对试验过程中的空间效应进行修正。为此本研究开发了一套包含先进物理试验测量仪(APTC)和动态棒价值测量软件包(LIGHT)的先进反应性测量系统(SMART),并对SMART开展了一系列验证试验。结果表明,SMART具备完整的物理启动试验功能,其精度和性能能够满足包括动态棒价值测量在内的物理启动试验的要求;在300 MW压水堆核电厂中的成功应用也充分验证了SMART的工程应用能力。 相似文献
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唐忠樑 《中国原子能科学研究院年报》2005,(1):15-15
CEFR在首次临界试验完成后,由净堆临界装载向运行装载冷态过渡。完成一系列物理试验后,在提升功率之前,逐渐向运行装载热备用态过渡(此时,反应堆的功率仍为零)。这时,反应堆的介质温度从250℃上升到360℃。由于堆芯材料温度和钠冷剂温度的变化引起了钠密度、燃料组件尺寸、钢反射层组件尺寸变化、Doppler效应以及栅板联箱径向膨胀导致堆芯径向尺寸改变的效应,使得堆的反应性发生改变。CEFR物理启动温度反应性系数测量试验就是测量CEFR从250℃等温加热到360℃时由于温度的变化所引起的反应性变化。 相似文献
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本文系统地介绍了秦山核电厂反应堆控制棒组价值和硼价值在首次物理启动中的测量试验。简要介绍了测量方法、仪器装置、试验经过、实测结果和误差分析。试验结果表明:测量值与理论计算值符合得很好,达到了验收准则的要求。 相似文献
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1977年完成了高通量工程试验反应堆(HFETR)第一炉活性区装载的零功率物理实验。本文介绍活性区装载的调整,活性区中子通量、γ照射量率和反应性等参数的测量结果。实验数据已供第一炉启动和运行使用,并用于校核了堆物理、屏蔽的计算方法和参数。 相似文献
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介绍了核动力反应堆压力系数测量方法。该方法利用反应堆压力变化会引起反应性变化的特性,用数字反应性仪和压力表测量多个温度测点的压力系数,拟合得到压力系数曲线,即可获得反应堆各温度点的压力系数值;还利用MCNP程序作压力系数校核计算,计算表明,校核计算结果与试验结果符合得很好。获得的反应堆压力系数值,用于指导反应堆运行及试验,对反应堆安全有重要意义。 相似文献
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《Annals of Nuclear Energy》2002,29(16):1933-1951
The possibility of using the standard conjugate gradient (CG) method to directly solve the Sn-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. 相似文献
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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. 相似文献
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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. 相似文献
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Wu Yu Wang Shouguo 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(18):3137-3139
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. 相似文献