The analysis of outdated and obsolete equipment of power units in the South-Ukrainian Nuclear Power Plant
Students Name: Ustychenko Kyrylo Viktorovych
Qualification Level: magister
Speciality: Nuclear Рower Еngineering
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: ABSTRACT Ustychenko K.V. Mysak S.I. (supervisor). The analysis of outdated and obsolete equipment of power units in the South-Ukrainian Nuclear Power Plant. Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract In accordance with IAEA safety standards SSR-2/1, "The design of NPPs must take due account of the effects of aging and wear in all operating modes for which the element is intended, including testing, maintenance, downtime due to maintenance" [1 ]. In addition, in accordance with IAEA safety standards SSR-2/2, "The operating organization must ensure the implementation of an effective aging management program to ensure that the facilities, systems and components of the station perform the necessary safety functions throughout the life of the station" [2]. Operating experience data can be collected and stored for later use in managing aspects of plant aging. Systematic aging management ensures the performance of safety functions throughout the life of the station and its decommissioning, taking into account changes that occur during use over time. This involves addressing both the aging of structures, systems and elements (KSE), which leads to a decrease in their performance, and issues of wear and tear of KSE, ie their aging compared to modern knowledge, standards and requirements, and technology [3] . In recent decades, the number of IAEA member states has been steadily increasing, for whom the priority is to extend the service life of the stations in the period after the original design life (which is usually 30-40 years). Recognizing the need to assist its member states in addressing specific problems arising from long-term operation (DSE), in 2003-2006 the IAEA launched an extrabudgetary program to assess the safety of long-term operation of water-water nuclear reactors [4]. The results of the program were presented in the safety report on long-term operation of nuclear power plants [5]. The administration of the separate subdivision of the South Ukrainian NPP (SE SUN NPP) considers its priority to carry out activities in the field of aging management, which is a key element for safe and reliable operation of SU NPP power units, which is relevant today. To achieve this goal, aging management programs for power units № 1, 2, 3 have been developed and are being implemented, and a number of organizational, technical and operational measures have been identified to keep degradation due to aging and wear within acceptable limits. The object of research is the aging processes of the equipment of power units of the South-Ukrainian NPP. The subject of research is the impact of aging processes of equipment on its safe operation. The purpose of the study is to manage the aging processes of equipment for safe and reliable operation of power units for a long period. Effective aging management (US) of elements and structures (EC) is one of the key elements of safe and reliable operation of nuclear power plants, the role of which grows in the operation of the NPP unit in excess of the design life or long-term operation (DSE). In this case, the reassigned service life is the service life established as a result of periodic safety reassessment, which means that during the TSE the service life of a NPP facility may be reassigned repeatedly. Aging management programs for individual elements and structures are designed to maintain within acceptable limits the degradation of EC, important for safety (due to aging, wear, corrosion, erosion, fatigue and other mechanisms), as well as the necessary actions to maintain their efficiency and reliability during operation . To achieve this goal, the following was performed: - The second section describes the mechanisms of degradation of equipment elements, measures and methods aimed at mitigating degradation, the main methods of control and monitoring, which allow to extend the service life; - in the third section, the cyclic strength and control of the mechanical properties of the vessels are calculated, based on these data, the decision is made to continue or know the operation of the equipment under inspection; - in the fourth section of automation the classification and systems of automatic regulation are specified; - in the fifth section the technical and economic indicators of the project are calculated. Keywords - aging management, structures, systems, elements, safe operation, South Ukrainian NPP. References. 1. INTERNATIONAL ATOMIC ENERGY AGENCY, (2012). Safety of Nuclear Power Plants: Design, IAEA Safety Standards Series No. SSR-2/1, IAEA, Vienna. 2. INTERNATIONAL ATOMIC ENERGY AGENCYЮ, (2011). Safety of Nuclear Power Plants: Commissioning and Operation, IAEA Safety Standards Series No. SSR-2/2, IAEA, Vienna. 3. INTERNATIONAL ATOMIC ENERGY AGENCY, (2009). Ageing Management for Nuclear Power Plants, IAEA Safety Standards Series No. NS-G-2.12, IAEA, Vienna. 4. INTERNATIONAL ATOMIC ENERGY AGENCY, (2002). Maintenance, Surveillance and In-service Inspection in Nuclear Power Plants, IAEA Safety Standards Series No. NS-G-2.6, IAEA, Vienna. 5. INTERNATIONAL ATOMIC ENERGY AGENCY, (2013). Periodic Safety Review of Nuclear Power Plants, IAEA Safety Standards Series No. SSG-25, IAEA, Vienna.