scholarly journals Strengthening the Capabilities of the State Nuclear Regulatory Inspectorate of Ukraine through Interaction of Ukrainian and International Technical Safety Organizations under Licensing of Long-Term Operation of South Ukraine-1

2015 ◽  
pp. 27-30
Author(s):  
O-i Shugailo ◽  
O-r Shugailo ◽  
D. Ryzhov
Keyword(s):  
Technical Support ◽  
The State ◽  
Energy Strategy ◽  
Term Operation ◽  
Support Organizations ◽  
Technical Safety ◽  
Made In

The Energy Strategy of Ukraine for the period until 2030 foresees that about half of the Ukrainian NPP units will constitute those with extended lifetime (long term operation) over the next 10 years. The first “pilot” plants for long-term operation were Rivne units 1 and 2 (VVER-440/213) in 2010. South Ukraine NPP unit 1 (VVER-1000/V-302) is the next step in gaining long-term operation experience in Ukraine (appropriate decision was made in 2012). In both cases, the decision was preceded by many-year comprehensive activities performed by the operator, regulator and national and international scientific and technical support organizations, which were involved in safety justification from the operator and regulator sides.

Performance of membrane bioreactor combined with pre-coagulation/sedimentation

2004 ◽  
Vol 4 (1) ◽  
pp. 143-149 ◽  
Author(s):  
T. Itonaga ◽  
Y. Watanabe
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Extracellular Polymeric Substances ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Term Operation ◽  
Made In

This paper deals with the performance of a hybrid membrane bioreactor (MBR) combined with pre-coagulation/sedimentation. Primary clarifier effluent in a municipal wastewater treatment plant was fed into the hybrid MBR to investigate its performance during long-term operation. Pre-coagulation/sedimentation process efficiently removed the suspended solids including organic matter and phosphorus. Comparison of the hybrid MBR and conventional MBR was made in terms of the permeate quality and membrane fouling. As the organic loading to the MBR was significantly reduced by the pre-coagulation/sedimentation, production and accumulation of extracellular polymeric substances (EPS) may be limited. Therefore, the mixed liquor viscosity in the hybrid MBR was much lower than that in the conventional MBR. These effect caused by pre-coagulation/sedimentation brought a remarkable improvement in both permeate quality and membrane permeability.

scholarly journals Evaluation of Approaches for Well Abandonment and Temporary Shutdown at the "Yeniseiskiy" Site (Krasnoyarsk Territory, Nizhnekanskiy Massif)

2020 ◽  
Vol 13 (4) ◽  
pp. 30-41
Author(s):  
V. S. Gupalo ◽  
◽  
K. S. Kazakov ◽  
V. Yu. Konovalov ◽  
G. D. Neuvazhaev ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Development Project ◽  
The State ◽  
Natural Conditions ◽  
Term Operation ◽  
Entire Complex ◽  
Well Abandonment ◽  
Current Stage ◽  
Geological Research

Rock mass is considered as a natural barrier impeding the release of radioactive waste into the environment, being part of a multi-barrier system designed to ensure the safety of deep disposal facilities for radioactive waste (DDF RW). A number of regulatory documents [1] and recommendations [2, 3] states the importance of the geological medium, namely, its characteristics for the long-term safety of RW disposal. Current stage of URL development project is specifically focused on providing the opportunities for geological research covering target RW disposal horizons solely via borehole methods before the entire complex of underground excavations is formed. Due to long-term operation of wells and their initial design features, the state of some of these wells has appeared to be unsatisfactory requiring reconstruction. In addition, in accordance with certain legislative requirements, all wells shall be abandoned after relevant operations have been completed. The article discusses the reconstruction and abandonment of wells drilled at the Yeniseiskiy site. It demonstrates the feasibility of proposed designs providing the opportunities for further expansion of studies to investigate the state of rocks under natural conditions and to arrange for monitoring. The paper provides an evaluation and comparative analysis of plugging materials proposed to be applied under well abandonment operations.

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.

Exiting Fragility

2021 ◽  
pp. 600-628
Author(s):  
Enrique Gelbard ◽  
Giorgia Albertin ◽  
Lars Engstrom ◽  
Jose Gijon ◽  
Clara Mira
Keyword(s):  
Social Inclusion ◽  
Central African Republic ◽  
Technical Support ◽  
The State ◽  
Economic Stability ◽  
African Countries ◽  
Building Process ◽  
Basic Services ◽  
Sub Saharan

Finding a path out of fragility is a complex and lengthy progress. This chapter examines the experience of five sub-Saharan African countries who are at different stages in the resilience- building process—Rwanda, Uganda, Côte d’Ivoire, Guinea, and the Central African Republic. It concludes that building resilience is the outcome of a virtuous circle of good policies and political and social inclusion that foster economic stability and growth, improve security, and enable the state to deliver basic services. For this to happen, a leadership capable of implementing a strategy with enough internal consensus and a mechanism to mobilize support is necessary. In addition, coordination among stakeholders on early and well-tailored financial and technical support and long-term engagement is key in supporting fragile countries. However, an uneven evolution of the above factors including weak capacity and governance easily lead to reversals and continued fragility.

scholarly journals Application of Interval Analysis Methods for NPP Power Units Safety and Reliability Assessment

2018 ◽  
pp. 23-29
Author(s):  
T. Potanina ◽  
O. Yefimov ◽  
T. Harkusha ◽  
T. Yesypenko
Keyword(s):  
Initial Data ◽  
Interval Analysis ◽  
Reliability Assessment ◽  
The State ◽  
Data Uncertainty ◽  
Unit Operation ◽  
Term Operation ◽  
State Program ◽  
Safety And Reliability

The study analizes the requirements for instrumentation and control systems of NPP units, which are currently under modernization in accordance with the state program for long-term operation of Ukrainian NPP units. The requirements established in the documents that regulate reliability and quality of performing functions by these systems emphasize the importance of developing methods to improve the accuracy of parameter measurements, methods to increase reliability of assessing safety and reliability indexes of NPP unit operation, as well as the accuracy of personnel decisions in the presence of many uncertainties and inaccuracies in the description of initial data that affect implementing necessary management actions by personnel. The paper presents the examples of the impact of initial data uncertainty on solving the tasks of safety and reliability assessment for NPP units. The study analyzes existing methods to account and describe initial data uncertainty and modeling uncertainty in the tasks of safety and operational reliability assessment for NPP units. The possibility of applying mathematical methods and tools of interval analysis to improve reliability of solving the issues of assessing safety, reliability and efficiency of NPP unit operation under conditions of initial data uncertainty was justified. The study presents the basic principles of interval calculations, which allow considering inaccuracies when specifying the initial data, parameter uncertainties and multi-mode nature of functioning of such complex technical systems as NPP units. The prospects of applying the main theoretical provisions of interval analysis and their implementation in the form of numerical methods and models to solve current issues of assessing safety, reliability and efficiency of accident-free operation of NPP units in compliance with the state program for long-term operation were specified.

Power Projects and Covid-19: A Practical Analysis of the Relevance of Force Majeure Clauses under the Standardised Power Purchase and Implementation Agreements of Uganda

2020 ◽  
Vol 1 (2) ◽  
pp. 189-193
Author(s):  
Aisha Naiga ◽  
Loyola Rwabose Karobwa
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
The State ◽  
Energy Sources ◽  
Policy Goals ◽  
Force Majeure ◽  
Practical Analysis ◽  
Energy Justice

Over 90% of Uganda's power is generated from renewable sources. Standardised Implementation Agreements and Power Purchase Agreements create a long-term relationship between Generating Companies and the state-owned off-taker guaranteed by Government. The COVID-19 pandemic and measures to curb the spread of the virus have triggered the scrutiny and application of force majeure (FM) clauses in these agreements. This article reviews the FM clauses and considers their relevance. The authors submit that FM clauses are a useful commercial tool for achieving energy justice by ensuring the continuity of the project, despite the dire effects of the pandemic. Proposals are made for practical considerations for a post-COVID-19 future which provides the continued pursuit of policy goals of promoting renewable energy sources and increasing access to clean energy, thus accelerating just energy transitions.

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