EDN: TRTVVI
Authors & Affiliations
Glazkov A.S.
National Research Centre “Kurchatov Institute”, Moscow, Russia
Glazkov A.S. – Research Engineer, National Research Centre “Kurchatov Institute”.
Contacts: 1, pl. Akademika Kurchatova, Moscow, Russia, 123182. Tel.: +7 (499) 196-71-00 (add 6267); e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Abstract
This article discusses the implementation and applicability of a realistic approach in terms of nuclear safety for severe accidents. The paper discusses the use and limitations of expert assessment methods, which are currently the most common approach to nuclear safety analysis within the realistic framework. Author of the article has developed a methodology that allows reducing number of calculations for nuclear safety analyses in WWER-1000 reactor using the example of a severe accident with loss of coolant, where reactor is in stage of refueling. Suggested methodology allows carrying out a nuclear safety analysis in terms of realistic approach, which should be done due to regulations in the field of safety analysis of nuclear power plants, for reactor in state with boiling coolant. The text of this work provides comparisons of the results of keff direct calculations and calculations using the developed methodology to confirm its consistency. keff calculations of states gained due to selection-states methodology represents main changes in keff behavior during the accident. A detailed analysis of the progression of the considered beyond-design-basis accident stage is provided, with explanations of the behavior of the effective neutron multiplication factor at each of the key time intervals. The developed methodology may be particularly relevant when using codes based on the Monte Carlo method due to the significant computational time required for each keff calculation. The need in improving of selection-states methodology has also been shown. It can be reached by using elements of artificial intelligence.
Keywords
nuclear safety analysis, realistic approach, optimization of number of calculated states, Monte Carlo method, WWER, severe accident, recriticality, LOCA, refueling
Article Text (PDF, in Russian)
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UDC 621.039.51.17
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2025, no. 2, 2:12
