共查询到19条相似文献,搜索用时 343 毫秒
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黄礼渊 《核电子学与探测技术》2011,31(10):1171-1174
反应堆启堆用智能化外推临界装置用于反应堆临界试验过程中进行自动计数和自动外推临界.该装置在用于外推临界试验之前必须在零功率反应堆或其它反应堆上进行考验试验.论文叙述了研制的反应堆启堆用智能化外推临界装置在零功率堆上考验试验的情况及试验结果.试验结果表明:智能化外推临界装置具有自动计数和自动外推临界的功能,且外推结果偏差... 相似文献
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概述了5MW THR 的装料,首次临界和控制棒调平试验的特点和结果。介绍了为保证安全所采用的外推方法和实际步骤。为了减小空间效应,在装料和外推临界过程中采用了特别的测量手段。实验证明,这些方法是有效的。 相似文献
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本文介绍5MW 低功率堆(5MW LPR)首次装料及首次临界试验。由于本堆使用有燃耗的燃料元件,铍作反射层,光激中子成为强的内中子源,其强度随着燃料元件装量的增加而增加。因此,装料时元件法外堆结果有较大的涨落,但整个装料过程是安全的。在次临界下,做了控制棒相对效率曲线,然后,提升控制棒,进行计数外推,达到首次临界。 相似文献
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本文根据反应堆外推临界的一般原理,用Visual Basic6.0开发了脉冲堆提棒外推临界辅助系统(ECAS).ECAS界面友好,操作简单,并有一定的容错功能;ECAS在脉冲堆首次临界试验中使用,给出结果与实际相符. 相似文献
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HWZPR original fuel is natural U metal fuel but other kinds of fuel can also be utilized. In a research work on UO2 fuel, reactor fuel was partially replaced by natural UO2 fuel and physical parameters of the new core were compared with original core. Thirty six natural U metal fuel rods were substituted by natural UO2 fuel assemblies. Prior to the first criticality operation with the new core, it was simulated by stochastic and deterministic calculation methods i.e. MCNP-4C and WIMS-CITATON codes, respectively. In order to investigate criticality and safety of the mixed core, important reactor physics parameters such as effective multiplication factor (Keff) at different water levels, critical water level, reactivity worth of D2O and reactivity worth of safety and control rods were calculated.The calculated results ensured reactor criticality and satisfied reactor safety criteria. Therefore, with the permission of the reactor safety committee, the first criticality operation was performed successfully. Later, during a series of reactor operations important physical parameters were measured experimentally. There is good consistency between the theoretical and experimental results. 相似文献
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首次临界试验是压水堆核电厂调试启动过程的关键环节,旨在确认核反应堆堆芯能按照设计要求达到预期的临界运行状态。本文利用西安交通大学自主研发的NECP-Bamboo程序系统对AP1000机组堆芯的首次临界试验的设计结果进行了验证计算,并与AP1000堆芯的核设计结果进行了比较。计算结果表明:预估临界状态下的硼浓度的偏差为-15 ppm,控制棒积分价值的最大偏差为-52 pcm,硼微分价值的偏差不超过0.2 pcm/ppm,反应性温度系数的偏差不超过1 pcm/K。本文计算结果的精度与高保真计算程序KENO(概率论方法)和VERA(确定论方法)的计算精度相当,为确保AP1000堆芯调试启动阶段的核安全提供了进一步的数据支撑。 相似文献
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对我国核临界安全工作的思考 总被引:1,自引:0,他引:1
对我国的核临界安全工作进行全面思考,肯定了40多年来我国核燃料循环生产系统的安全业绩,指出可能导致核临界事故的着急环节及存在问题,对于如何进一步加强核临界安全工作,从多角度提出对策。 相似文献
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核反应堆电源具有寿命长、可全天候工作等特点,可作为星球表面及其他深空探测任务的电源。针对星球表面用核反应堆电源在发射过程中重返地面的临界安全问题,提出了星球表面用核反应堆的临界安全分析要求、分析假设与模型,并对反应堆临界安全特性及采取的临界安全措施进行了计算分析。计算结果表明,不同假设掉落环境下的星球表面用核反应堆的有效增殖因数均小于0.98,满足临界安全要求。反应堆通过采用Mo-14%Re合金结构材料、设置相对较厚的堆芯反射层以及在反射层包壳和堆芯外围涂覆Gd2O3涂层等措施有利于确保反应堆在事故时处于次临界状态。 相似文献
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Hark Rho Kim Choong Sung Lee Byung Chul Lee Ji Bok Lee 《Nuclear Engineering and Design》1998,179(3):281-286
The HANARO (High-flux Advanced Neutron Application Research reactOr) is a newly created research reactor. Its initial criticality was achieved on February 8, 1995. In its design stage, the HANAFMS, which is the nuclear analysis and fuel management code system for the HANARO, was verified using the results from the MCNP4A full core model because there was no similar research reactor in the world. It was needed to verify the HANAFMS with reactor physics experiments, which were performed during the reactor commissioning and power operation. The calculated results for the criticality, power distribution and control absorber rod (CAR) worth were compared with the measured ones. In the criticality calculation, the clean and depleted cores were applied and in the comparison of power distribution, the gamma scanning data of the fuel assemblies were used. The CAR worth was calculated following the measurement positions and then compared with the measurements. The calculated results for verifying the HANAFMS are in good agreement with the measured ones. 相似文献
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在新燃料组件运输过程中,临界安全是重点。使用MCNP程序对中国先进研究堆新燃料组件的运输进行临界安全计算分析,通过选取最不利临界安全的次临界限值、组件模型参数、事故工况来保证计算结果的保守性。结果表明,运输货包的临界安全指数可确定为0。该结果可为中国先进研究堆(CARR)的新燃料组件运输容器的研发提供参考依据。 相似文献
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用蒙特卡罗方法进行核临界安全计算 总被引:1,自引:1,他引:0
本文介绍了蒙特卡罗程序AMPX-KENO系统的铀富集厂核临界安全计算机中的应用,并为此作了大量临实验数据的验证计算和可用于实际生产的临界安全参数计算。 相似文献