Quantitative resilience evaluation on recovery from emergency situations in nuclear power plants

2021 ◽  
Vol 156 ◽  
pp. 108220
Author(s):  
Ji Tae Kim ◽  
Jonghyun Kim ◽  
Poong Hyun Seong ◽  
Jooyoung Park
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Emergency Situations

The analysis of emergency situations related to fires at nuclear power plants

2021 ◽  
Vol 30 (5) ◽  
pp. 66-75
Author(s):  
S. A. Titov ◽  
N. M. Barbin ◽  
A. M. Kobelev
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Nuclear Reactor ◽  
Reactor Core ◽  
Emergency Situations ◽  
The Usa ◽  
Large Fires ◽  
Short Circuits ◽  
Nuclear Reactor Core

Introduction. The article provides a system and statistical analysis of emergency situations associated with fires at nuclear power plants (NPPs) in various countries of the world for the period from 1955 to 2019. The countries, where fires occurred at nuclear power plants, were identified (the USA, Great Britain, Switzerland, the USSR, Germany, Spain, Japan, Russia, India and France). Facilities, exposed to fires, are identified; causes of fires are indicated. The types of reactors where accidents and incidents, accompanied by large fires, have been determined.The analysis of major emergency situations at nuclear power plants accompanied by large fires. During the period from 1955 to 2019, 27 large fires were registered at nuclear power plants in 10 countries. The largest number of major fires was registered in 1984 (three fires), all of them occurred in the USSR. Most frequently, emergency situations occurred at transformers and cable channels — 40 %, nuclear reactor core — 15 %, reactor turbine — 11 %, reactor vessel — 7 %, steam pipeline systems, cooling towers — 7 %. The main causes of fires were technical malfunctions — 33 %, fires caused by the personnel — 30 %, fires due to short circuits — 18 %, due to natural disasters (natural conditions) — 15 % and unknown reasons — 4 %. A greater number of fires were registered at RBMK — 6, VVER — 5, BWR — 3, and PWR — 3 reactors.Conclusions. Having analyzed accidents, involving large fires at nuclear power plants during the period from 1955 to 2019, we come to the conclusion that the largest number of large fires was registered in the USSR. Nonetheless, to ensure safety at all stages of the life cycle of a nuclear power plant, it is necessary to apply such measures that would prevent the occurrence of severe fires and ensure the protection of personnel and the general public from the effects of a radiation accident.

Substantiation of Pressure Compensator Construction for Nuclear Power Plants in Emergency Situations

2021 ◽  
pp. 675-684
Author(s):  
Igor Kozlov ◽  
Vladimir Skalozubov ◽  
Vladislav Spinov ◽  
Dmitriy Spinov ◽  
Predrag Dasic
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Emergency Situations

scholarly journals The optimization of nuclear power plants operation modes in emergency situations

2018 ◽  
Vol 945 ◽  
pp. 012028
Author(s):  
A M Zagrebayev ◽  
A V Trifonenkov ◽  
R N Ramazanov
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Emergency Situations ◽  
Operation Modes

Problems of Population Radiation Safety Support in Case of Radiation Accidents

2018 ◽  
pp. 74-82 ◽  
Author(s):  
С. Гончаров ◽  
S. Goncharov ◽  
Г. Аветисов ◽  
G. Avetisov
Keyword(s):  
Russian Federation ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Radiation Safety ◽  
Disaster Medicine ◽  
Protective Measures ◽  
Emergency Situations ◽  
Radiation Accidents ◽  
The Russian Federation

The article presents the results of 25-old activity of the head agency of the Service for Disaster Medicine of the Ministry of Health of the Russian Federation – All Russian Centre for Disaster Medicine «Zaschita» (ARCDM «Zaschita») of the Ministry of Health of the Russian Federation in the sphere of medical support of population in case of radiation accidents. The Service is a functional subsystem of the Unified State system of prevention and liquidation of emergency situations, intended for elimination of medical and sanitary consequences of emergency situation. In Russia, it is legally established that in case of radiation accident the Federal Medical Biological Agency of Russia (the FMBA of Russia) is responsible for radiation safety of the population living in the NPP surveillance zone (approximately 25 km). Responsibility for the radiation safety of the rest of the population living outside the surveillance zone is assigned to the Service for disaster medicine. In accordance with the current document “Model content of the protection plan of the population in case of an accident at the radiation facility” developed by the Ministry of Emergency Situations, mandatory protective measures are provided in the territory that radius is 25 km around the radiation object (planning zones of preventive and emergency measures). Early planning in the restrictive planning zone is not envisaged, and protective measures outside the 100-kilometer zone are considered inappropriate. The article presents the concept developed by the specialists of ARCDM «Zaschita» for drafting protection of the subjects of the Russian Federation for the nuclear power plants operating on the territory of Russia. The concept is based on experience of consequences of the Chernobyl NPP accident. The concept argues that the outer boundary of the planning area for protective measures around nuclear power plants should have an outer radius of 1000 km. Radius of the emergency planning area is 100 km. The problems of preparedness for radiation safety of population support in case of radiation accidents are discussed. They are: the need for elaboration of regulatory and normative documents of the federal level on obligatory advance planning of protective measures against the possibility of radiation accidents on radiation-hazardous objects from the nuclear power plants on the territory of Russia for the population, not supervised by the FMBA of Russia (living both in the observation zone and abroad) and regulating the need and procedure of planning, organization and carrying out in case of necessity iodine prophylaxis for the population on territories up to 1000 km from operating NPPs of Russia. Same approaches to the solution of the considered problems are suggested.

scholarly journals A Sensor Fault-Tolerant Accident Diagnosis System

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5839
Author(s):  
Jeonghun Choi ◽  
Seung Jun Lee
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Fault Tolerant ◽  
Multivariate Time Series ◽  
Diagnosis System ◽  
Emergency Situations ◽  
Automatic Reactor ◽  
Sensor Errors ◽  
Gated Recurrent Unit

Emergency situations in nuclear power plants are accompanied by an automatic reactor shutdown, which gives a big task burden to the plant operators under highly stressful conditions. Diagnosis of the occurred accident is an essential sequence for optimum mitigations; however, it is also a critical source of error because the results of accident identification determine the task flow connected to all subsequent tasks. To support accident identification in nuclear power plants, recurrent neural network (RNN)-based approaches have recently shown outstanding performances. Despite the achievements though, the robustness of RNN models is not promising because wrong inputs have been shown to degrade the performance of RNNs to a greater extent than other methods in some applications. In this research, an accident diagnosis system that is tolerant to sensor faults is developed based on an existing RNN model and tested with anticipated sensor errors. To find the optimum strategy to mitigate sensor error, Missforest, selected from among various imputation methods, and gated recurrent unit with decay (GRUD), developed for multivariate time series imputation based on the RNN model, are compared to examine the extent that they recover the diagnosis accuracies within a given threshold.

On the Dose Coefficient of Uranium Hexafluoride

2021 ◽  
Vol 66 (5) ◽  
pp. 11-17
Author(s):  
S. Babenko ◽  
A. Bad'in
Keyword(s):  
Radiation Exposure ◽  
Nuclear Power ◽  
Power Plants ◽  
Radiation Effects ◽  
Nuclear Power Plants ◽  
Radiation Effect ◽  
Uranium Hexafluoride ◽  
The Body ◽  
Emergency Situations ◽  
Hydrolysis Products

Introduction: Uranium hexafluoride (UF6, UHF) is a gaseous product containing uranium and fluorine. Once in the air, it interacts with water vapor and produces hydrolysis products that can penetrate the human body and lead to the chemical effects of uranium and fluorine, as well as the radiation effects of uranium on the body. This action can be very strong and therefore serious attention has been paid to its study for a long time. Purpose: Quantitative calculation of the radiation effects of uranium on humans and their analysis in the conditions of daily work at nuclear power plants, as well as in emergency situations. Material and methods: We consider uranium hexafluoride that appears under certain conditions in the air of the working rooms of some enterprises and describes methods for describing the distribution of UHF hydrolysis products to objects that can sense their effects. All these methods are combined into a single integrated model. The analytical expressions obtained in the framework of this model at various stages are given, which make it possible to calculate the radiation effect of UHF. Results: The calculated values of the characteristics of the radiation exposure are given, their analysis is carried out. The conditions are formulated under which there is a danger of serious radiation exposure of uranium hexafluoride to employees of nuclear power plants during everyday work and in emergency situations. Conclusion: Based on all the material presented, it is concluded that the constructed mathematical model reliably describes the event in question and allows us to calculate the radiation effect of uranium on humans.

Work structure in nuclear power plants

1983 ◽  
Author(s):  
Marjorie B. Bauman ◽  
Richard F. Pain ◽  
Harold P. Van Cott ◽  
Margery K. Davidson
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Work Structure
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