共查询到18条相似文献,搜索用时 171 毫秒
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秦山一期反应堆的中子计数率监测 总被引:1,自引:0,他引:1
应用高效涂硼计数管,结合改变次级中子源在堆芯的位置,解决了由于堆内中子源衰减过多而导致堆外源量程对中子计数率的监测出现盲区的问题,并以秦山核电厂第五循环装料的实际情况为实例作了阐述。 相似文献
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对中国实验快堆新燃料组件进行非破坏性分析测量,分别采用了有源中子符合法和γ射线测量法。利用改装设计的有源中子符合环(UNCC)对2组燃料组件中^235U含量分布进行了测量检验。测量曲线的分布趋势与实际丰度分布一致。组件中子符合计数率与位置对应示意图如图1所示。 相似文献
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为查明AREVA NP GmbH供货的在线式硼表(BCMS)测量准确度超标原因,研究提高BCMS测量准确度的方案。根据BCMS工作原理,从中子测量和总硼浓度计算环节对影响BCMS测量准确度的因素进行了分析,并统计分析了BCMS的测量数据;选择测量准确度高于BCMS的离线式硼表(OFBM)为对标对象,在同等统计误差分析条件下对二者的测量准确度进行了对比;以中国核动力研究设计院研制的在线式硼表(ONBM)为参考,量化分析了被测管道尺寸对BCMS中子计数率的影响。结果表明:BCMS在制造厂测试和在核电厂运行期间均存在测量准确度超标问题;BCMS测量准确度超标是由其中子测量装置在固定计数时长内测得的累积中子计数率过低所致;BCMS中子源与中子探测器之间有聚乙烯损耗中子的缺陷。提出了通过切削聚乙烯屏蔽层,同时更换高热中子灵敏度探测器提高BCMS测量准确度的改造方案。 相似文献
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本文介绍了秦山核电厂核测系统在装料前后、零功率和功率试验阶段的调试过程、方法和主要数据以及源量程、中间量程和功率量程之间的复盖情况。最后对将来核测系统的设计提出了几点建议。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(7):707-713
A novel method of γ-ray compensation in a neutron ionization chamber (CIC) is developed as an ex-core nuclear instrumentation in a pressurized water reactor. To minimize the dependence of the compensation efficiency on γ-ray dose and dose rate, the improved CIC has the signal electrode with small holes to induce leakage or fringing electric fields. Change in compensation characteristics could be controlled by adjusting the field strength. It has been shown that the compensation margin for adjustment can be extended to 5-8%. 相似文献
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压水堆核电厂启动过程中,次级中子源为堆外源量程探测器提供本底计数率,避免测量盲区,确保反应堆安全启动。但次级中子源的引入会为核电厂带来较大的经济和环境负担,同时也需承受次级中子源破损等带来的风险。为此,可使用受辐照燃料组件的自发裂变中子源进行替代,即无源启动方式。通过研究堆外源量程探测器计数率的理论计算方法,并基于运行电厂测量数据进行分析验证,为源量程探测器计数率的理论预估提供了较为完善的理论方法流程。本文结果可为无源启动源量程探测器计数率分析提供支持,同时也可用于次级中子源装载量或布置位置的优化分析等。 相似文献
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《Annals of Nuclear Energy》1999,26(12):1113-1130
A coupled thermohydraulics and neutron model is used to simulate signals of thermocouples, ex-core and in-core neutron detectors of nuclear power plants (NPP). Noise sources are generated as time functions and the dynamic behavior of the reactor core is modeled by one-dimensional two-group diffusion equations coupled with an axial thermohydraulics model. These equations are solved by numerical methods and the resulting time series are considered as virtual measurements. We show that one can model only a finite set of noise sources with high accuracy by this approach because of the finite nature of numerical methods. The selection of length of space segments is presented and the effect of space aliasing is briefly discussed. An automatic stepsize selection algortihm is introduced which was applied successfully in the simulator. Simulation results are analyzed and compared with real measurements by studying disturbance propagation in the coolant. 相似文献