RESEARCH OF REGULATORY DOCUMENTS AND INDUSTRY STANDARDS FOR THE DEVELOPMENT OF SAFETY-IMPORTANT COMPUTER SYSTEMS FOR NPP CONTROL SYSTEMS

Abstract

Today, one of the main sources of electrical energy are nuclear power plants (NPP). In today's world, digital control systems with widespread use of computers and controllers are used to manage technological processes and ensure safety at nuclear power plants. The safe operation of the NPP depends on the quality and reliability of the software of such systems. In this work, a study of normative documents and standards related to the development of software for computer control systems of nuclear power plants, important for safety, was conducted. The purpose of the work is to define standards that can be used by software developers for computerized NPP control systems important for safety. The object of research is the process of developing software for computer control systems of nuclear power plants. The subject is the study of regulatory documents and industry standards for the development of software for computer control systems of nuclear power plants. As a result of the study, the safety criteria of computer control systems were determined, the IEC 61508 and IEC 61513 standards were studied, the IAEA SSG-39 safety instruction was studied, the categories of control functions and safety classes of NPP systems were determined, the standards containing software requirements were studied , user interfaces and MISRA C/C++ coding. Conclusions. In order to create highly reliable and high-quality software for computer control systems of nuclear power plants, which are important for safety, there are design standards and industry regulatory documents in the world. The result of the study of standards and industry regulatory documents relevant to the development of software for NPP computer control systems important for safety is the following: international standards and regulatory documents have different levels of specialization. The higher-level documents specify the general requirements for all stages of the life cycle of computer control systems and contain references to the documents of the next level. Documents of the next level are more specialized and relate to narrower fields of activity; each country of the world can determine its own set of standards and regulatory documents, which is required to be used during the design and implementation of computer control systems for nuclear power plants; regulatory documents contain requirements and recommendations both regarding the organization of the development process, as well as general recommendations and examples of writing program code in various programming languages; due to the fact that the requirements of the considered standards must be relevant for a long time, these standards do not contain formalized methods of writing program code; there are no formalized methods of code certification for compliance with the requirements of the considered standards; each organization that is engaged in the design, development and verification of software for computer control systems for nuclear power plants must develop its own methods for applying requirements and evaluating criteria for meeting the requirements of standards and regulations. Thus, it was concluded that the prospects for further research are a detailed analysis of the requirements of international standards and industry normative documents for the software of computer systems of NPP management and the development of a methodology for its writing and assessment of compliance with the requirements of the standards.