This paper introduces the inspection by Guangdong Regional Office(GRO) of the leak-tight liner of the 3
rd unit of Ling’ao Nuclear Power Plant.During the inspection,the inspectors from GRO found some problems,including the material of the liner not in accordance with PASR and RCC-G,and Non-Conformance management.The occurrence of this non-conformance and its disposal reveal that it is necessary,for the manufacture and purchase of safety important components,to strengthen the regulatory inspection and to enhance the quality assurance,during the plant construction stage.