Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants

Hiroyasu Saitoh; Teruhito Otsuka; Norihiko Yoshikawa; Nozomu Kanno; Seiji Takanashi; Yousuke Oozawa; Masahiro Hirata; Masayuki Takeshita; Kenji Sakuragi; Sayuri Kurihara; Yuichiro Tsunashima; Naohito Aoki; Kento Tanaka

doi:10.1016/j.jlp.2019.03.011

Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants

Hiroyasu Saitoh, Teruhito Otsuka, Norihiko Yoshikawa, Nozomu Kanno, Seiji Takanashi, Yousuke Oozawa, Masahiro Hirata, Masayuki Takeshita, Kenji Sakuragi, Sayuri Kurihara, Yuichiro Tsunashima, Naohito Aoki, Kento Tanaka

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

A novel mitigation system against hydrogen-air deflagrations in nuclear power plant buildings is proposed and developed through a series of field experiments using explosion vessels of different volume sizes. The mitigation system is installed on the outer surface of the vessels, and it comprises flame arrester and explosion air bag. The flame arrester is made by stacking 10–20 sheets of fine-mesh wire screens, and the air bag is connected for holding explosion gas. The successful mitigation mechanism is the sequence of pressure-rise reduction by the air bag expansion, flame quenching by the flame arrester, and the slow burning of the gas mixture sucked from the air bag back into the vessel due to the negative pressure caused by the rapid condensation of water vapor inside the vessel. Necessary conditions for the successful mitigation system are discussed, and the practical unit size of flame arrester sheet is recommended.

Original language	English
Pages (from-to)	9-16
Number of pages	8
Journal	Journal of Loss Prevention in the Process Industries
Volume	60
DOIs	https://doi.org/10.1016/j.jlp.2019.03.011
Publication status	Published - 2019 Jul

Keywords

Deflagration
Flame arrester
Hydrogen explosion
Mitigation
Nuclear power plant
Severe accident

ASJC Scopus subject areas

Control and Systems Engineering
Food Science
Chemical Engineering(all)
Safety, Risk, Reliability and Quality
Energy Engineering and Power Technology
Management Science and Operations Research
Industrial and Manufacturing Engineering

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10.1016/j.jlp.2019.03.011

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Saitoh, H., Otsuka, T., Yoshikawa, N., Kanno, N., Takanashi, S., Oozawa, Y., Hirata, M., Takeshita, M., Sakuragi, K., Kurihara, S., Tsunashima, Y., Aoki, N., & Tanaka, K. (2019). Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants. Journal of Loss Prevention in the Process Industries, 60, 9-16. https://doi.org/10.1016/j.jlp.2019.03.011

Saitoh, H, Otsuka, T, Yoshikawa, N, Kanno, N, Takanashi, S, Oozawa, Y, Hirata, M, Takeshita, M, Sakuragi, K, Kurihara, S, Tsunashima, Y, Aoki, N & Tanaka, K 2019, 'Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants', Journal of Loss Prevention in the Process Industries, vol. 60, pp. 9-16. https://doi.org/10.1016/j.jlp.2019.03.011

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abstract = "A novel mitigation system against hydrogen-air deflagrations in nuclear power plant buildings is proposed and developed through a series of field experiments using explosion vessels of different volume sizes. The mitigation system is installed on the outer surface of the vessels, and it comprises flame arrester and explosion air bag. The flame arrester is made by stacking 10–20 sheets of fine-mesh wire screens, and the air bag is connected for holding explosion gas. The successful mitigation mechanism is the sequence of pressure-rise reduction by the air bag expansion, flame quenching by the flame arrester, and the slow burning of the gas mixture sucked from the air bag back into the vessel due to the negative pressure caused by the rapid condensation of water vapor inside the vessel. Necessary conditions for the successful mitigation system are discussed, and the practical unit size of flame arrester sheet is recommended.",

keywords = "Deflagration, Flame arrester, Hydrogen explosion, Mitigation, Nuclear power plant, Severe accident",

author = "Hiroyasu Saitoh and Teruhito Otsuka and Norihiko Yoshikawa and Nozomu Kanno and Seiji Takanashi and Yousuke Oozawa and Masahiro Hirata and Masayuki Takeshita and Kenji Sakuragi and Sayuri Kurihara and Yuichiro Tsunashima and Naohito Aoki and Kento Tanaka",

note = "Funding Information: The present experimental study was conducted as one of the light water reactor hydrogen safety programs of the Japan Atomic Energy Agency, under the financial support of the Ministry of Economy, Trade and Industry of Japan (METI) , during the period of 2012–2016. Publisher Copyright: {\textcopyright} 2019 The Authors",

year = "2019",

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doi = "10.1016/j.jlp.2019.03.011",

language = "English",

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T1 - Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants

AU - Saitoh, Hiroyasu

AU - Otsuka, Teruhito

AU - Yoshikawa, Norihiko

AU - Kanno, Nozomu

AU - Takanashi, Seiji

AU - Oozawa, Yousuke

AU - Hirata, Masahiro

AU - Takeshita, Masayuki

AU - Sakuragi, Kenji

AU - Kurihara, Sayuri

AU - Tsunashima, Yuichiro

AU - Aoki, Naohito

AU - Tanaka, Kento

N1 - Funding Information: The present experimental study was conducted as one of the light water reactor hydrogen safety programs of the Japan Atomic Energy Agency, under the financial support of the Ministry of Economy, Trade and Industry of Japan (METI) , during the period of 2012–2016. Publisher Copyright: © 2019 The Authors

PY - 2019/7

Y1 - 2019/7

N2 - A novel mitigation system against hydrogen-air deflagrations in nuclear power plant buildings is proposed and developed through a series of field experiments using explosion vessels of different volume sizes. The mitigation system is installed on the outer surface of the vessels, and it comprises flame arrester and explosion air bag. The flame arrester is made by stacking 10–20 sheets of fine-mesh wire screens, and the air bag is connected for holding explosion gas. The successful mitigation mechanism is the sequence of pressure-rise reduction by the air bag expansion, flame quenching by the flame arrester, and the slow burning of the gas mixture sucked from the air bag back into the vessel due to the negative pressure caused by the rapid condensation of water vapor inside the vessel. Necessary conditions for the successful mitigation system are discussed, and the practical unit size of flame arrester sheet is recommended.

AB - A novel mitigation system against hydrogen-air deflagrations in nuclear power plant buildings is proposed and developed through a series of field experiments using explosion vessels of different volume sizes. The mitigation system is installed on the outer surface of the vessels, and it comprises flame arrester and explosion air bag. The flame arrester is made by stacking 10–20 sheets of fine-mesh wire screens, and the air bag is connected for holding explosion gas. The successful mitigation mechanism is the sequence of pressure-rise reduction by the air bag expansion, flame quenching by the flame arrester, and the slow burning of the gas mixture sucked from the air bag back into the vessel due to the negative pressure caused by the rapid condensation of water vapor inside the vessel. Necessary conditions for the successful mitigation system are discussed, and the practical unit size of flame arrester sheet is recommended.

KW - Deflagration

KW - Flame arrester

KW - Hydrogen explosion

KW - Mitigation

KW - Nuclear power plant

KW - Severe accident

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Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants

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Keywords

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