TUBULAR SHELL OF WATER REACTOR FUEL ELEMENT

摘要

FIELD: power engineering. ^ SUBSTANCE: tubular shell comprises an outer layer from the first zirconium-based alloy and has an inner layer metallurgically attached to it from the second zirconium-based alloy. The inner layer protects the tubular shell against corrosion cracking under stress. The second zirconium-based alloy contains tin as an alloying material, and each zirconium-based alloy contains at least 96 wt percent of zirconium. The first zirconium-based alloy contains at least 0.1 wt percent of niobium. The second alloy contains 0.02-0.03 wt percent of iron. The inner layer thickness makes 5-40% of the tubular shell thickness. The method to manufacture the tubular shell includes a stage of joint extrusion of two tubes from different zirconium-based alloys to produce a tubular shell. ^ EFFECT: invention makes it possible to develop a corrosion-resistant tubular shell of a water reactor fuel element. ^ 24 cl, 3 dwg