Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment)
Sodium fire is one of risk factors for containment failure in a sodium-cooled fast reactor in case of sodium spray from the top of a reactor vessel due to a power excursion during a severe accident. Modifications of multi-dimensional sodium fire analysis code AQUA-SF have been carried out so as to i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2018-03-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/84/859/84_17-00374/_pdf/-char/en |
| _version_ | 1798015160473878528 |
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| author | Mitsuhiro AOYAGI Takashi TAKATA Shuji OHNO Masayoshi UNO |
| author_facet | Mitsuhiro AOYAGI Takashi TAKATA Shuji OHNO Masayoshi UNO |
| author_sort | Mitsuhiro AOYAGI |
| collection | DOAJ |
| description | Sodium fire is one of risk factors for containment failure in a sodium-cooled fast reactor in case of sodium spray from the top of a reactor vessel due to a power excursion during a severe accident. Modifications of multi-dimensional sodium fire analysis code AQUA-SF have been carried out so as to investigate the sodium fire under the severe accident condition inside a reactor containment. The GGDH (Generalized Gradient Diffusion Hypothesis) turbulence model and a radiation model for sodium droplets were newly implemented to the AQUA-SF code. A validation study has been conducted through a benchmark analysis of an upward spray combustion experiment. This paper describes detailed influencing factors in the benchmark analysis. Reasonable temperature distribution is obtained in turbulence analyses although a laminar analysis shows an upward high temperature jet which was not observed in the experiment. The temperature distributions are almost the same between the analyses with the previous and GGDH turbulence models because there is no significant difference in the balance of production and dissipation of turbulence energy between them. The radiation model for sodium droplet increases heat transfer to structure and hence gas temperature and pressure decrease. Consequently, it has been confirmed that the experimental results is simulated reasonably by the newly introduced models in the AQUA-SF code. This means the improved AQUA-SF code is applicable for investigation of sodium fire under the severe accident condition. In addition, because the improved models on turbulence and radiation are applicable for various sodium fire events, general validity for various cases would be confirmed by additional validation activities. |
| first_indexed | 2024-04-11T15:29:06Z |
| format | Article |
| id | doaj.art-646f6f88b34a4f819f16cd415405a01a |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:29:06Z |
| publishDate | 2018-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-646f6f88b34a4f819f16cd415405a01a2022-12-22T04:16:10ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612018-03-018485917-0037417-0037410.1299/transjsme.17-00374transjsmeApplication of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment)Mitsuhiro AOYAGI0Takashi TAKATA1Shuji OHNO2Masayoshi UNO3Japan Atomic Energy AgencyJapan Atomic Energy AgencyJapan Atomic Energy AgencyResearch Institute of Nuclear Engineering, University of FukuiSodium fire is one of risk factors for containment failure in a sodium-cooled fast reactor in case of sodium spray from the top of a reactor vessel due to a power excursion during a severe accident. Modifications of multi-dimensional sodium fire analysis code AQUA-SF have been carried out so as to investigate the sodium fire under the severe accident condition inside a reactor containment. The GGDH (Generalized Gradient Diffusion Hypothesis) turbulence model and a radiation model for sodium droplets were newly implemented to the AQUA-SF code. A validation study has been conducted through a benchmark analysis of an upward spray combustion experiment. This paper describes detailed influencing factors in the benchmark analysis. Reasonable temperature distribution is obtained in turbulence analyses although a laminar analysis shows an upward high temperature jet which was not observed in the experiment. The temperature distributions are almost the same between the analyses with the previous and GGDH turbulence models because there is no significant difference in the balance of production and dissipation of turbulence energy between them. The radiation model for sodium droplet increases heat transfer to structure and hence gas temperature and pressure decrease. Consequently, it has been confirmed that the experimental results is simulated reasonably by the newly introduced models in the AQUA-SF code. This means the improved AQUA-SF code is applicable for investigation of sodium fire under the severe accident condition. In addition, because the improved models on turbulence and radiation are applicable for various sodium fire events, general validity for various cases would be confirmed by additional validation activities.https://www.jstage.jst.go.jp/article/transjsme/84/859/84_17-00374/_pdf/-char/ensodium cooled fast reactorsodium firespray combustionmulti dimensional analysisv&v |
| spellingShingle | Mitsuhiro AOYAGI Takashi TAKATA Shuji OHNO Masayoshi UNO Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) Nihon Kikai Gakkai ronbunshu sodium cooled fast reactor sodium fire spray combustion multi dimensional analysis v&v |
| title | Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) |
| title_full | Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) |
| title_fullStr | Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) |
| title_full_unstemmed | Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) |
| title_short | Application of multi-dimensional sodium fire analysis code AQUA-SF to severe accident (Benchmark analysis of upward spray combustion experiment) |
| title_sort | application of multi dimensional sodium fire analysis code aqua sf to severe accident benchmark analysis of upward spray combustion experiment |
| topic | sodium cooled fast reactor sodium fire spray combustion multi dimensional analysis v&v |
| url | https://www.jstage.jst.go.jp/article/transjsme/84/859/84_17-00374/_pdf/-char/en |
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