The nuclear island of a new nuclear power plant is designed according to the standard of a foreign country. The material used in equipments

components and structures of the nuclear island shall conform to ASTM

ASME or other codes and standards. During the construction of the subject project

in order to lower the construction cost and shorten the procurement period

some metal materials procured from domestic manufacturer brought material substitution into being

for example

in some cases

some American standard materials were substituted by Chinese standard materials

or other American ones. This paper outlines the material substit-ution issue during the construction of the new nuclear power project. It describes the causes

purposes and requested principles for material substitution

including performance equivalence

code and specification permission

and additional design coordination measures in detail. It also describes the classification

enumeration and analysis of typical cases in regards to material substitution. Besides

based on the method and sharing pointed in this paper

the standardized material substitution process can be formed in nuclear power project construction which can provide reference for material substitution in the acquisition of similar technology or the export of projects.