Code development for advanced non-LWRs based on the system based code concept

Asayama, Tai 

This paper presents a future vision for safety and structural code development for advanced non-light water reactors. The most important feature that these codes and standards should have is that they ensure that safety goals are met in the way most appropriate and practical to the characters of new reactors which could be significantly different from those of light water ones. For this purpose, the author proposes a universal structure which consists of goals, codes and standards and knowledge base. The goals will be defined in terms of safety, reliability and economy. Codes and standards will form a seamless structure which provides multiple pathways with intermediary targets that correlate the goals and candidate technical options for structure and component design. Margins will be allocated in a plant lifecycle utilizing the System Based Code Concept. Knowledge bases will support codes and standards and allows for timely technical updates. As a future vision, a concept of digitalized autonomous code in which autonomous technical updates of provisions are realized is presented.