Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants
The containment system (CS) is the last barrier to the release of radioactive substances into the environment in the event of a nuclear accident. After each overload, this system is tested for its ability to perform its functions by determining the integral leakage, which should not exceed a certai...
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| Format: | Article |
| Language: | English |
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Warsaw University of Life Sciences
2024-11-01
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| Series: | Przegląd Naukowy Inżynieria i Kształtowanie Środowiska |
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| Online Access: | https://srees.sggw.edu.pl/article/view/9956 |
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| author | Sergii Surkov Volodymyr Kravchenko Iryna Korduba Andrii Golovchenko Oleksandr Butenko Serhii Tsybytovskyi Yuliia Trach |
| author_facet | Sergii Surkov Volodymyr Kravchenko Iryna Korduba Andrii Golovchenko Oleksandr Butenko Serhii Tsybytovskyi Yuliia Trach |
| author_sort | Sergii Surkov |
| collection | DOAJ |
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The containment system (CS) is the last barrier to the release of radioactive substances into the environment in the event of a nuclear accident. After each overload, this system is tested for its ability to perform its functions by determining the integral leakage, which should not exceed a certain value. The tests are performed at an overpressure in the CS of 0.72 kgcm–2, which is achieved by injecting air with a compressor. The paper considers the use of an ejector to accelerate the injection process, which has a positive effect on the technical and economic performance of a nuclear power plant (NPP) power unit by increasing the amount of electricity generated, which is very important today, when the NPPs provide the maximum share of electricity generated in the country. Previous studies have evaluated the use of an ejector for this purpose, but they did not consider the need to install filters on the intake air stream. In addition, they used numerical methods that generate an error. The present work uses a mathematical apparatus that provides a more accurate result. The obtained calculated compressor injection time coincides with the actual injection time for the Rivne NPP power units. The design of the ejector ensures the minimum injection time is determined. The optimal ejector module is equal to 8.6 (the ratio of the cross-sectional area of the cylindrical mixing chamber to the critical cross-sectional area of the working air nozzle). This reduces the injection time by 38.8%. The suction air must be free of dust and moisture. Suitable filters have a total aerodynamic resistance of 0.2 bar. Taking these air filters into account slightly reduces the efficiency of the ejector. The final time of air injection using the ejector is 2.56 h, which reduces the time of air injection for testing by 35.5%.
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| format | Article |
| id | doaj-art-362e5c4cae434796b0be5da02b5e45ce |
| institution | DOAJ |
| issn | 1732-9353 2543-7496 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Warsaw University of Life Sciences |
| record_format | Article |
| series | Przegląd Naukowy Inżynieria i Kształtowanie Środowiska |
| spelling | doaj-art-362e5c4cae434796b0be5da02b5e45ce2025-08-20T02:52:56ZengWarsaw University of Life SciencesPrzegląd Naukowy Inżynieria i Kształtowanie Środowiska1732-93532543-74962024-11-0133410.22630/srees.9956Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plantsSergii Surkov0Volodymyr Kravchenko1Iryna Korduba2Andrii Golovchenko3Oleksandr Butenko4Serhii Tsybytovskyi5Yuliia Trach6Odesa Polytechnic National University, Institute of Distance and Correspondence Education, UkraineOdesa Polytechnic National University, Nuclear Power Plants Department, UkraineKyiv National University of Construction and Architecture, Department of Environmental Protection Technologies and Labor Protection, UkraineOdesa Polytechnic National University, Nuclear Power Plants Department, UkraineOdesa Polytechnic National University, Institute of Distance and Correspondence Education, UkraineKyiv National University of Construction and Architecture, Department of Environmental Protection Technologies and Labor Protection, UkraineWarsaw University of Life Sciences – SGGW, Institute of Civil Engineering, Poland National University of Water and Environmental Engineering, Institute of Agroecology and Land Management, Ukraine The containment system (CS) is the last barrier to the release of radioactive substances into the environment in the event of a nuclear accident. After each overload, this system is tested for its ability to perform its functions by determining the integral leakage, which should not exceed a certain value. The tests are performed at an overpressure in the CS of 0.72 kgcm–2, which is achieved by injecting air with a compressor. The paper considers the use of an ejector to accelerate the injection process, which has a positive effect on the technical and economic performance of a nuclear power plant (NPP) power unit by increasing the amount of electricity generated, which is very important today, when the NPPs provide the maximum share of electricity generated in the country. Previous studies have evaluated the use of an ejector for this purpose, but they did not consider the need to install filters on the intake air stream. In addition, they used numerical methods that generate an error. The present work uses a mathematical apparatus that provides a more accurate result. The obtained calculated compressor injection time coincides with the actual injection time for the Rivne NPP power units. The design of the ejector ensures the minimum injection time is determined. The optimal ejector module is equal to 8.6 (the ratio of the cross-sectional area of the cylindrical mixing chamber to the critical cross-sectional area of the working air nozzle). This reduces the injection time by 38.8%. The suction air must be free of dust and moisture. Suitable filters have a total aerodynamic resistance of 0.2 bar. Taking these air filters into account slightly reduces the efficiency of the ejector. The final time of air injection using the ejector is 2.56 h, which reduces the time of air injection for testing by 35.5%. https://srees.sggw.edu.pl/article/view/9956airtight enclosure systemair injection timeoptimal ejector design |
| spellingShingle | Sergii Surkov Volodymyr Kravchenko Iryna Korduba Andrii Golovchenko Oleksandr Butenko Serhii Tsybytovskyi Yuliia Trach Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants Przegląd Naukowy Inżynieria i Kształtowanie Środowiska airtight enclosure system air injection time optimal ejector design |
| title | Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| title_full | Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| title_fullStr | Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| title_full_unstemmed | Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| title_short | Use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| title_sort | use of an ejector to reduce the time of air injection during testing of the containment system at nuclear power plants |
| topic | airtight enclosure system air injection time optimal ejector design |
| url | https://srees.sggw.edu.pl/article/view/9956 |
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