Study on the Localization of Instrumentation Installation Materials for AP1000

Abstract

This paper analyzed the standards of instrumentation installation components for the nuclear island of AP1000 NPP, made a comparison with Chinese standards, studied the localization of the instrumentation tube and fittings, and proposed the material substitution principles during construction. To decrease the quantity of changes, materials of original design will be used for priority. If original materials cannot be bought in China, they can be substituted by materials of national standards. If the substitution is needed the American standards, national standards should be compared carefully. The chemical composition of two materials should be similar. The composition that is beneficial to the performance of the material should not be lower than the original material, while composition that is harmful should not be higher than the original. And the mechanical performance of the material should not be lower than the original material.