用气态裂变产物溶液/脱气入铅冷却剂模型对包层失效检测系统中气举探头的灵敏度进行了评价

N. Gonchar, M. Morkin
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引用次数: 0

摘要

气举探头是透视式铅冷堆包层失效检测系统的重要组成部分。它的功能是对冷却剂中气态裂变产物活性的局部测量,以及对缺陷最大的燃料组件进行定位。在离开缺陷燃料组件的冷却剂中,气态裂变产物的比活度高于一次回路中的平均活度。在气举探针的干扰通道中,气态裂变产物通过气泡界面表面扩散到气泡的体积中。气泡在分离体积中将气态裂变产物输送到界面表面。富含放射性气态裂变产物的气体进入探针的测量体积。损坏越严重,有缺陷的燃料组件离探针输入越近,就会记录到越多的气态裂变产物活动。提出了一种从包层缺陷到探头测量体积的气体活度传递模型。根据铅中惰性气体的溶解/脱气过程描述了气体活性转移。气升探针的灵敏度估计为气体进入测量体积的速度与通过燃料组件包层缺陷进入冷却剂的速度之比。以燃油暴露面气举探头灵敏度为例进行了计算。考虑了具有显著伽马辐射的气态裂变产物。文中给出了计算结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A SENSITIVITY EVALUATION OF GAS-LIFT PROBE INCLUDED INTO CLADDING FAILURE DETECTION SYSTEM BY THE MODEL OF GASEOUS FISSION PRODUCT SOLUTION/DEGASSING INTO LEAD COOLANT
Gas-lift probe is an element of cladding failure detection system of perspective lead cooled reactor. Its function is local measurement of gaseous fission product activity in the coolant and the most defected fuel assembly localization. In the coolant leaving the defected fuel assembly the specific activity of gaseous fission products is higher than the average one in the primary circuit. In the barbotage channel of gas-lift probe gaseous fission products diffuse through the bubble interface surface into the volume of the bubbles. The bubbles deliver gaseous fission product to interface surface in the separation volume. The gas enriched with radioactive gaseous fission product goes to measurement volume of the probe. The more significant the damage and the closer the defective fuel assembly is located to the probe input, the more gaseous fission product activity will be registered. The paper presents a model of gaseous activity transfer from cladding defect to probe measuring volume. The gaseous activity transfer is described on the basis of the inert gases dissolution/degassing processes in lead. The gas-lift probe sensitivity was estimated as the ratio of the entry velocity of gaseous activity into the measurement volume to the exit one into the coolant through fuel assemblies cladding defects. A gas-lift probe sensitivity for exposed fuel surface calculated as an example. Gaseous fission products with significant gamma radiation are considered. The calculation results are presented in the article.
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