Reliability assessment of emergency auxiliaries of an NPP using an additional steam turbine under various modes of its utilization

Under complete blackout of a station, it is possible to cool-down the VVER-1000 type reactors using the energy of residual heat release of the reactors. The calculations from past works showed in the context of Balakovo nuclear power plant, that a single low-power steam-turbine unit by utilizing the...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 1652; no. 1; pp. 12042 - 12050
Main Authors Aminov, R Z, Yurin, V E
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.10.2020
Subjects
Blackout
Circuits
Diesel generators
Electrical loads
Emergency power systems
Investigations
Nuclear power plants
Nuclear reactors
Nuclear safety
Physics
Redundancy
Reliability analysis
Steam electric power generation
Steam turbines
System effectiveness
Turbines
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Summary:Under complete blackout of a station, it is possible to cool-down the VVER-1000 type reactors using the energy of residual heat release of the reactors. The calculations from past works showed in the context of Balakovo nuclear power plant, that a single low-power steam-turbine unit by utilizing the energy of residual heat release from one reactor is capable to provide electricity for two VVER-1000 power units, including the cases when the first circuit in one of the units is depressurized. This work is a continuation of the investigation of the general-station reserve systems for nuclear power plants own needs. The effectiveness of the joint installation of an additional multifunctional steam turbine and a mobile general-station diesel generator was investigated taking into account the results of a large research of the causes for not starting diesel generators at nuclear power plants, conducted by scientists from the USA and Canada, according to which the interval of the percentage of their non-start ranges from 1 to 3%. It is shown that the reliability of such concurrent redundancy of the NPP's own needs meets the IAEA requirements. Also in the work, the reliability of the developed emergency power supply system was investigated in the conditions of the additional steam turbine stop during the night off-peak hours of the electrical load. Research has shown that this is not acceptable for the accepted conditions from a safety point of view.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1652/1/012042