Safety Analysis of the Fourth Unit of Balakovo NPP under the Design Extension Conditions
DOI:
https://doi.org/10.24160/1993-6982-2024-4-143-151Keywords:
safety analysis, acceptance criteria, critical safety functions, beyond design basic accidents management guideline, severe state, control state, operational personnelAbstract
As a part of the safety analysis of the fourth unit of Balokovo nuclear power plant thermohydraulic calculations are performed which demonstrate that thermohydraulic acceptance criteria are not exceeded in the considering modes. During some of these calculations violation of critical safety functions are used as acceptance criteria. These violations are accepted according to beyond design basic accidents management guideline at the stage of preventing severe accidents and also during accident transfer conditions into the severe state. In case of violation of the acceptance criteria in the considering mode the operational personal should take actions according to the beyond design basic accidents management guideline in order to restore critical safety functions and transfer nuclear power plant into the control state.
In this paper the mode “Loss off site power supply with emergency diesel generator failure (total blackout) and with failure of the emergency protection system (ATWS)” is considered for the analysis. The analysis of this mode is performed in two stages. First, we perform a calculation of this mode without actions of operational personnel in order to evaluate how much time they have before this accident will be transferred into the severe state. Secondly, we perform calculations with actions of operational personal to prevent transfer of this accident into the severe state and restore critical safety functions. The results of this analysis shows that in order to successfully transfer this accidents into the safety state the additional system which is used for remote control of plot operated relief valves should be integrated into the safety systems and additional actions for opening of plot operated relief valves should be added into the beyond design basic accidents management guideline.
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Для цитирования: Полевой М.А. Анализ безопасности четвертого блока Балаковской атомной электростанции в условиях запроектных аварий с учетом действий оперативного персонала // Вестник МЭИ. 2024. № 4. С. 143—151. DOI: 10.24160/1993-6982-2024-4-143-151.
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For citation: Polevoi M.A. Safety Analysis of the Fourth Unit of Balakovo NPP under the Design Extension Conditions. Bulletin of MPEI. 2024;4:143—151. (in Russian). DOI: 10.24160/1993-6982-2024-4-143-151.
