scholarly journals Results of Analysis of Aging Related Events at Ukrainian NPPs

2020 ◽  
pp. 44-51
Author(s):  
O-i Shugailo ◽  
O. Ligotskyy ◽  
O. Pecherytsia ◽  
O. Kulman ◽  
R. Moskalyshyn ◽  
...  
Keyword(s):  
Nuclear Energy ◽  
Maximum Efficiency ◽  
Operational Experience ◽  
Aging Effects ◽  
Term Operation ◽  
Operation Period ◽  
Periodic Safety ◽  
Nuclear Installation ◽  
Main Factors

The design lifetime (30 years) of Ukrainian NPPs has already been expired or will be expired soon. One of the priority areas for the development of nuclear energy is long-term operation (LTO) based on the results of periodic safety review. At present, eleven Ukrainian NPP units are operated under LTO conditions, which in turn causes certain features of operation related to wear, fatigue and general aging of components and structures. An issue of aging management is considered one of the main factors to ensure the safety of a nuclear installation, both in the design lifetime and in the long-term operation. The primary purpose of aging management is to ensure the safety and maximum efficiency of operation through the implementation of technically and economically feasible measures aimed at timely detection and keeping of degradation of NPP components caused by aging within the limits. One way to determine the efficiency of implemented measures and aging management programs is to analyze operational experience and, in particular, analyze the number of NPP operational occurrences during the design and long-term operation period and that are directly related to the aging effects. This paper presents the results of the analysis of the events at Ukrainian NPPs caused by aging processes, compares the results of national and international experience.

scholarly journals Experience Obtained and Lessons Learnt from the Transition of Ukrainian NPPs to Long-Term Operation

2020 ◽  
pp. 15-29
Author(s):  
O. Shugailo ◽  
Yu. Grebenyuk ◽  
O. Zelenyі ◽  
D. Ryzhov ◽  
Ol-r Shugaylo ◽  
...  
Keyword(s):  
The State ◽  
Highly Qualified ◽  
Safety Review ◽  
Term Operation ◽  
Lessons Learnt ◽  
Periodic Safety ◽  
Scientific Potential ◽  
Unique Experience ◽  
Review Reports

Nuclear energy is a strategic Ukrainian industry that produces more than 50% of electricity at present. Over the last decade during the operation of Ukrainian NPPs, the set of technical matters have been found and corresponding tasks shall be decided with engaging of scientific potential of the country. One of such matter is a safety justification of NPP components and structures for the period that is bigger than an initial design one and that is defined as transition from design operation to the long-term operation (LTO). From the end of 2010 to the beginning of 2020, the State Nuclear Regulatory Inspectorate of Ukraine granted 11 licenses for 11 power units based on positive results of the state assessment and review of Periodic Safety Review Reports considering mandatory safety review each ten years. These results became possible due to the coordinated, conscientious and longstanding work of thousands of highly qualified nuclear experts, which led to the fact that Ukraine now has a unique experience in preparation for a transition of various types of WWER-1000 and WWER-440 reactors to LTO. The summarized results and lessons learnt from the practice of transition to LTO are presented in this paper.

scholarly journals Social Media: useful for high-risk industries? A study of nuclear energy in Spain

2021 ◽  
Vol 34 (1) ◽  
pp. 143-154
Author(s):  
Enrique Cobos-Urbina
Keyword(s):  
Social Media ◽  
Corporate Reputation ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Energy ◽  
Nuclear Power Plants ◽  
Review Of The Literature ◽  
Communication Tools ◽  
Term Operation

Social Media has become an unquestionable communicative tool for most organizations. Companies want to participate in the conversation on the network for various purposes: attracting new customers, promoting their products, exalting their brand, searching for prescribers, etc. However, those corporations that belong to risk sectors –as is the case of nuclear power plants– show initial suspicion because they consider that new forms of communication contribute to encouraging criticism of their business model, producing a deterioration in their image. The methodology used in this research is based on three pillars: a review of the literature on CSR, corporate reputation, Social Media and Nuclear Communication; exploration of Social Media in search of official profiles of nuclear power plants; and interviews with those responsible for communicating atomic plants to know their perception in the use of these supports. Spanish nuclear power plants do not actively use Social Media. These facilities rely on monologic communication tools and tactics, although they need dialogue for acceptance and long-term operation. Social Media are essential tools for risk sectors: to disseminate the science they make, to collect feedback and respond to criticism, and to seek consensus.

scholarly journals THE MAIN GAS PIPELINES DEFECTS ANALYZING BY OPERATION PERIOD AND EXTENSION

2019 ◽  
pp. 93-99
Author(s):  
S. V. Kitaev ◽  
N. M. Darsalia ◽  
I. R. Baykov ◽  
O. V. Smorodova
Keyword(s):  
Gini Index ◽  
Gas Pipeline ◽  
Pipeline System ◽  
Gas Pipelines ◽  
Line Pipe ◽  
Term Operation ◽  
Wide Range ◽  
Operation Period ◽  
Standard Service

The gas pipeline system of PJSC «Gazprom» is at the stage of long-term operation. Most of the pipelines exceed the standard service life of 33 years, while considerable resources are required to maintain the trunk gas pipelines in an efficient state. The article analyzes the defectiveness of gas mains by the example of LLC «Gazprom transgaz Ufa». The company’s gas pipeline system consists of a wide range of diameters pipes ranging from DN 400 to DN 1400 mm. Its structure is dominated by pipelines with a diameter of DN 400, 500, 700, 1400 mm, which share exceeds 86 %. An integral Gini index is proposed for monitoring the differentiation of defects along the length of the line pipe of the main gas pipelines. By the value of the proposed indicator, it is possible to analyze and compare the sections of gas pipelines among themselves, to identify the signs that affect the development of defects along the line pipe of the main gas pipelines.

scholarly journals Weld metal irradiation embrittlement analysis in the range of over-design neutron fluences

2020 ◽  
Vol 21 (4) ◽  
pp. 323-327
Author(s):  
L.I. Chyrko ◽  
◽  
V.M. Revka ◽  
Yu.V. Chaikovskyi ◽  
M.G. Goliak ◽  
...  
Keyword(s):  
Weld Metal ◽  
Temperature Shift ◽  
Reactor Vessel ◽  
Irradiation Embrittlement ◽  
Term Operation ◽  
Neutron Fluences ◽  
Operation Period ◽  
Experimental Values ◽  
Fracture Toughness Specimen

The comparison of experimental values of the critical brittle temperature ΔTF and reference temperature ΔT0 of VVER-1000 reactor vessel weld metal with an elevated content of manganese and nickel is performed. ΔTF and ΔT0 values are defined proceeding from the standard impact bend Charpy and Charpy cracked fracture toughness specimen tests, respectively. Specimens were irradiated in industrial reactors in the frame of surveillance specimen program up to the fast (E ≥ 0.5 MeV) neutron fluences corresponding to the NPP long term operation period. The research results showed the shifts ΔTF and ΔT0 to agree with each other. Besides, it was discovered that in the range of over-design fluences the design embrittlement model has a tendency to underestimate the critical brittle temperature shift.

OECD/NEA Activities to Support Long Term Operation

2010 ◽  
Vol 5 (6) ◽  
pp. 707-711
Author(s):  
Andrei Blahoianu ◽  
◽  
Alejandro Huerta ◽  
Keyword(s):  
Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Energy ◽  
State Of The Art ◽  
Integrated Approach ◽  
Energy Agency ◽  
Term Operation ◽  
Plant Life

The Integrity and Aging of Components and Structures Working Group (IAGE) of the Organisation for Economic Cooperation and Development (OECD)/Nuclear Energy Agency (NEA) was established under the Committee on the Safety of Nuclear Installations (CSNI) for three reasons: (i) to advance the current understanding of those aspects relevant to ensuring the integrity of structures, systems, and components ; (ii) to provide for guidance in choosing the optimal ways to handle challenges to the integrity of operating as well as new nuclear power plants, and (iii) to take an integrated approach to design, safety, and nuclear power plant life management. The group operates through annual plenary meetings and technical workshops and by issuing state-of-the-art reports and topical opinion papers. This paper details some recent IAGE activities and products, focusing on those dealing with the degradationmechanisms of metal and concrete components.

scholarly journals TCAD AND SPICE MODELING OF SILICON VLSI ELEMENTS TAKING INTO ACCOUNT FOR TEMPERATURE, RADIATION AND AGING EFFECTS

2021 ◽  
Author(s):  
Konstantin Petrosyants
Keyword(s):  
Radiation Effects ◽  
Aging Effects ◽  
Term Operation ◽  
Wide Range ◽  
Temperature Radiation ◽  
Silicon Vlsi

RAD-THERM-AGING versions of TCAD and SPICE models have been developed for BiCMOS VLSI components with submicron and nanometer sizes, taking into account for various types of radiation effects, temperatures in the wide range of -260°C…+300°C and aging during long-term operation.

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