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核电工程对燃料元件用的锆合金包壳管、端塞棒质量要求极高,而燃料元件用材是由铸锭经热冷加工制造的,熔炼铸锭时所添加的回收料的质量好坏对材料最终性能有一定的影响。特别是回收料中不得混有高密度夹杂物。本文介绍射线照相检测高密度夹杂的原理及影像特征,并提出改善γ射线底片像质几个关键技术。一年多现场应用结果表明,用本文优化试验结果建立的γ射线探伤方法及检测系统达到了相关技术条件规定要求,可检出厚度≤130mm锆合金返回料板坯中颗粒尺寸≥1.5mm的高密度夹杂,该系统具有经济、实用、可靠、高效的特点。
Nuclear power projects for the fuel element with zirconium alloy cladding tube, end stopper rod of the highest quality requirements, and the fuel element material is made by the ingot by hot and cold processing, ingot melting smelting add the quality of the recovered material on the material The final performance has a certain impact. In particular, the recycled material should not be mixed with high-density inclusions. This paper introduces the principles and imaging features of radiographic detection of high-density inclusions and proposes several key technologies to improve the quality of gamma-ray film. The application results of more than one year on site show that the γ ray detection method and the detection system established by the optimized test results meet the requirements of the relevant technical conditions and the height of the returned material slab with a thickness of ≤130 mm can be detected as high as ≥1.5 mm The density of mixed, the system is economical, practical, reliable and efficient features.