scholarly journals Evalulation of the Specification for Safety-Related Steel Structures for Nuclear Facilities, ANSI/AISC N690-18, for Application to Nuclear Power Plants

2019 ◽  
Author(s):  
Joseph Braverman ◽  
Charles Hofmayer ◽  
Richard Morante
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Steel Structures ◽  
Nuclear Facilities

INTERCOMPARISON ON INTERNAL DOSE ASSESSMENT FOR NUCLEAR POWER PLANTS IN KOREA

2019 ◽  
Vol 186 (4) ◽  
pp. 524-529
Author(s):  
Si Young Kim
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Evaluation Method ◽  
Dose Assessment ◽  
Assessment Procedure ◽  
Internal Dose ◽  
Nuclear Facilities ◽  
International Intercomparison ◽  
Selection Of

Abstract The intercomparison test is a quality assurance activity performed for internal dose assessment. In Korea, the intercomparison test on internal dose assessment was carried out for nuclear facilities in May 2018. The test involved four nuclear facilities in Korea, and seven exposure scenarios were applied. These scenarios cover the intake of 131I, a uranium mixture, 60Co and tritium under various conditions. This paper only reviews the participant results of three scenarios pertinent to the operation of nuclear power plants and adopts the statistical evaluation method, used in international intercomparison tests, to determine the significance values of the results. Although no outliers were established in the test, improvements in the internal dose assessment procedure were derived. These included the selection of intake time, selection of lung absorption type according to the chemical form and consideration of the contribution of previous intake.

The Regulatory Framework for Safe Decommissioning of Nuclear Power Plants in Korea

2013 ◽  
Author(s):  
Sangmyeon Ahn ◽  
Jungjoon Lee ◽  
Chanwoo Jeong ◽  
Kyungwoo Choi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Regulatory Framework ◽  
International Standards ◽  
Current Status ◽  
Nuclear Facilities ◽  
Safety Requirement ◽  
Regulatory Review ◽  
Safety Standards

We are having 23 units of nuclear power plants in operation and 5 units of nuclear power plants under construction in Korea as of September 2012. However, we don’t have any experience on shutdown permanently and decommissioning of nuclear power plants. There are only two research reactors being decommissioned since 1997. It is realized that improvement of the regulatory framework for decommissioning of nuclear facilities has been emphasized constantly from the point of view of IAEA’s safety standards. It is also known that IAEA will prepare the safety requirement on decommissioning of facilities; its title is the Safe Decommissioning of Facilities, General Safety Requirement Part 6. According to the result of IAEA’s Integrated Regulatory Review Service (IRRS) mission to Korea in 2011, it was recommended that the regulatory framework should require decommissioning plans for nuclear installations to be constructed and operated and these plans should be updated periodically. In addition, after the Fukushima nuclear disaster in Japan in March of 2011, preparedness for early decommissioning caused by an unexpected severe accident became important issues and concerns. In this respect, it is acknowledged that the regulatory framework for decommissioning of nuclear facilities in Korea need to be improved. First of all, we focus on identifying the current status and relevant issues of regulatory framework for decommissioning of nuclear power plants compared to the IAEA’s safety standards in order to achieve our goal. And then the plan is established for improvement of regulatory framework for decommissioning of nuclear power plants in Korea. It is expected that if the things will go forward as planned, the revised regulatory framework for decommissioning could enhance the safety regime on the decommissioning of nuclear power plants in Korea in light of international standards.

scholarly journals On Geological and Geophysical Safety of the New Safe Confinement for ChNPP-4

2016 ◽  
pp. 44-50
Author(s):  
V. Shestopalov ◽  
Iu. Shybetskyi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Nuclear Facilities ◽  
Traditional Methods ◽  
Local Depression ◽  
Fault Structures ◽  
Potential Impact

The paper considers evidences and mechanisms of potential impact of local depression (microgeodynamic) zones on NPP safety. The depression forms were revealed within the Chornobyl NPP site, including location of the new safe confinement. Nature of zones and character of their influence is determined by fault structures and conjugated deep degassing processes, which cannot be detected and studied by traditional methods of engineering and exploration works during NPP siting. The assumption was made that significant and still unexplored risks for nuclear facilities are related to probable release of deep hydrogen through the bottom of depressions along sub-bottom channels. The approaches were proposed to studying the system of “depression with its sub-bottom channel” within the sites of Chornobyl NPP and other nuclear power plants.

scholarly journals The Work Results of the Institute for Safety Problems of Nuclear Power Plants of the NAS of Ukraine in 2020

2021 ◽  
Vol 20 ◽  
pp. 96-105
Author(s):  
V. S. Havrylenko ◽  
◽  
I. V. Kutsyna ◽  
D. I. Кhvalin ◽  
◽  
...  
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Spent Nuclear Fuel ◽  
Scientific Work ◽  
Development Effort ◽  
Nuclear Facilities ◽  
Energy Agency ◽  
Public Authorities ◽  
Organizational Activities

The year 2020 has become a real challenge for almost all aspects of life all over the world. Under these conditions, Ukrainian science, which has been in a state of crisis for more than a year, has been forced to overcome additional difficulties. However, due to the efforts of scientists, scientific work not only did not stop, but also received a large development effort in new directions and formats. In 2020, the Institute for Safety Problems of Nuclear Power Plants was one of the scientific institutions that under the new conditions made every effort to carry out the planned scientific researches and perform works in accordance with its activities. The main results of scientific and scientific-organizational activities of the Institute for Safety Problems of Nuclear Power Plants in 2020 are presented in the article. Despite the difficult economic situation due to the epidemic, the staff of the Institute obtained important results in studies of nuclear and radiation safety of the Shelter object, and in works aimed at improving the reliability and safety of existing Ukrainian and foreign nuclear power plants. The results of works in the field of the Shelter object transformation into an ecologically safe system, safe operation of nuclear facilities, decommissioning of nuclear facilities, spent nuclear fuel and radioactive waste management are presented in the article. The results of the work performed under the International Atomic Energy Agency (IAEA) grant and the Ukrainian-Japanese Science and Technology Research Partnership for Sustainable Development (SATREPS) project are described. The implementation of the results of these studies in practice is indicated. Scientific and expert activities in the interests and at the request of public authorities, cooperation with national and foreign scientific organizations as well as scientific and organizational activities in 2020 are described. Information on internal certification of employees, participation in international and national events, publishing and etc. is presented.

scholarly journals Cancer Incidence in the Population Residing Near Nuclear Power Plants in India, - A Study From Tata Memorial Centre, Mumbai

2021 ◽  
Author(s):  
B Ganesh ◽  
Mahadev Bhise ◽  
Rajesh Dixit ◽  
Pankaj Chaturvedi ◽  
Rajendra Badwe ◽  
...  
Keyword(s):  
Cancer Incidence ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Cumulative Risk ◽  
Cancer Registries ◽  
Nuclear Facilities ◽  
Multiple Cancer ◽  
Cancer Data ◽  
Risk Of Cancer

Abstract Background: The very few research studies done on risk of cancer among population living vicinity of Nuclear Power Plants (NPPs) locations in India. This is first study to examine cancer incidence, Mortality and Tobacco related cancers in population living near to nuclear power plants (NPPs). Methods: All sites of cancer data collected during 2011-15 period from six population-based cancer registries established near to nuclear power plant locations in India. The statistical tools such as age-standardized rate (ASRs), age-standardized mortality rate (ASMRs), Cumulative risk, mortality to incidence ratio, and probability of developing cancer is used to examine cancer burden among population near nuclear facilities. Results: The cancer incidence in population near NPPs are lower than the other non-NPP registries in India, and even national average. In males, mouth, tongue, oesophagus, larynx and lung are most common cancers; and breast, cervix and ovary are more predominate among females in all six NPP registries. Nearly, 50% of cancer are related to tobacco consummation in all registries. This study does not found any excess risk of cancer incidence in population living near to the nuclear facilities. Conclusion: Overall, our study findings are consistent with other well document studies on the risk of cancer among population near nuclear facilities. The main strength of this study is that this is first large study on cancer risk in population living near to NPPs areas. Also, this highlighted the need for the ecological study of multiple cancer types in the population living near nuclear facilities; and record linkage-based case-control study of cancer in children and adults near nuclear facilities.

scholarly journals The Code Builders

2014 ◽  
Vol 136 (05) ◽  
pp. 36-41
Author(s):  
Sidney Bernsen ◽  
Bryan Erler ◽  
Dana K. Morton ◽  
Owen Hedden
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Pressure Vessels ◽  
Reactor Vessel ◽  
National Standards ◽  
Nuclear Facilities ◽  
Consensus Process ◽  
Internal Structures ◽  
Design Construction

This article elaborates the evolution of code and standards for nuclear power plants. In the 1950s, need was felt for a revised set of design and fabrication rules to facilitate the development of safe, economically competitive water-cooled reactors contained in pressure vessels. These rules were codified in the first edition of the ASME Boiler and Pressure Vessel Code Section III, which was completed in 1963 and published in 1964. From the outset, both regulators and industry realized that the best way to develop many of the needed rules for the design, construction, and operation of nuclear facilities was the national standards consensus process. This process, followed by the American National Standards Institute and other recognized standards-issuing bodies such as ASME, brings together the expertise of individuals from government, industry, academia, and other stakeholders. In the years following the first publication of Section III, the coverage of the Code expanded to incorporate piping requirements, pressure-retaining components for pumps and valves, equipment and piping supports, reactor vessel internal structures, and other features of nuclear power plants.

scholarly journals Nuclear terrorism: Assessment of the danger of Nuclear Power Plant air strikes

2021 ◽  
Vol 2021 (3) ◽  
pp. 39-46
Author(s):  
A. Metelkov
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Energy Use ◽  
Security Measures ◽  
Nuclear Facilities ◽  
Nuclear Terrorism ◽  
Extreme Loads ◽  
Urgent Task ◽  
Nuclear Security

The article analyzes the problem of possible threats with the use of aircraft captured by terrorists or controlled unmanned aerial vehicles in relation to nuclear energy use facilities. In the context of preventing acts of nuclear terrorism, the urgent task is to protect nuclear facilities from deliberate attacks by civilian airliners operated by terrorists. On the basis of the materials of publications, the influence of external extreme loads acting on the design of nuclear power plants, their features during the fall of aircraft of different types is studied. As a conclusion, the author notes that improving the safety of nuclear power plants and other radiation-hazardous facilities, minimizing possible consequences from aircraft strikes are important areas in risk management and their protection from acts of nuclear terrorism by combining organizational measures to combat terrorism and nuclear security measures.

Using Probabilistic Criteria in an Assessment of the Potential Radiological Consequences of the Decommissioning of a Nuclear Research Reactor

2013 ◽  
Author(s):  
Christian Wallner ◽  
Anna-Maria Rall ◽  
Severin Thummerer
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Research Reactor ◽  
Nuclear Research ◽  
Exposure Dose ◽  
Occurrence Frequency ◽  
Normal Operation ◽  
Nuclear Facilities ◽  
Nuclear Research Reactor

In order to assess the risk of radiological consequences of incidents and accidents in nuclear facilities it is important to contemplate their frequency of occurrence. It has to be shown that incidents and accidents occur sufficiently seldom according to their radiological consequences i. e. the occurrence frequency of radiological doses has to be limited. This is even demanded by the German radiation protection ordinance (StrlSchV), which says that in nuclear facilities other than nuclear power plants (NPP) in operation and for decommissioning, the occurrence frequency of incidents and accidents shall be contemplated in order to prove the design of safety measures and safety installations. Based on the ideas of the ICRP64, we developed a risk based assessment concept for nuclear facilities, which fulfils the requirements of the German regulations concerning dose limits in normal operation and design basis accidents. The general use of the concept is dedicated to nuclear facilities other than nuclear power plants (NPP) in operation and for decommissioning, where the regulation of risk assessment is less sophisticated. The concept specifies occurrence frequency limits for radiation exposure dose ranges, i. e. the occurrence frequency of incidents and accidents has to be limited according to their radiological effects. To apply this concept, scenarios of incidents and accidents are grouped in exposition classes according to their resulting potential effective dose to members of the general public. The occurrence frequencies of the incidents and accidents are summarized in each exposition class whereas the sum must not exceed the frequency limits mentioned above. In the following we introduce the application of this concept in the assessment of the potential radiological consequences of the decommissioning of a nuclear research reactor. We carried out this assessment for the licensing process of the decommissioning on behalf of German authorities.

Tellurium radionuclides produced by major accidental events in nuclear power plants

2019 ◽  
Vol 16 (4) ◽  
pp. 296 ◽  
Author(s):  
Teba Gil-Díaz
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Future Research ◽  
Critical Element ◽  
Nuclear Facilities ◽  
Environmental Persistence ◽  
Risk Assessment And Management ◽  
Environmental Compartments

Environmental contextHistorical accidents in nuclear power plants have released radionuclides of several elements, including tellurium, to the environment. Although tellurium radionuclides are significant radioactive emission products, and show medium-term persistence in the environment, the mechanisms behind their widespread dispersion are unknown. Future research into the biogeochemical behaviour of stable tellurium is proposed as an appropriate approach to develop tellurium dispersion scenarios fundamental for post-accident management. AbstractTellurium (Te) is a technology critical element (TCE) and a non-negligible fission product in nuclear facilities. This work compiles the environmental releases of Te radionuclides registered after two nuclear power plant (NPP) major accidental events in human history (Chernobyl and Fukushima Daiichi). Despite the registered non-negligible activities and environmental persistence, Te radionuclides are scarcely monitored, which limits the current understanding of their biogeochemical behaviour, dispersion and fate in all environmental compartments. This lack of knowledge implies an underestimation of the role of Te radionuclides during and after accidents and its consideration in dispersion scenarios, which are fundamental for post-accidental risk assessment and management.

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