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

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

研究成果: Article

抄録

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.

元の言語English
ページ(範囲)9-16
ページ数8
ジャーナルJournal of Loss Prevention in the Process Industries
60
DOI
出版物ステータスPublished - 2019 7 1

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nuclear power
power plants
Nuclear power plants
hydrogen
Explosions
Hydrogen
bags
explosions
air
Air
Steam
Gas mixtures
Water vapor
gases
Condensation
Quenching
Gases
Wire
wire
water vapor

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

これを引用

Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants. / Saito, Hiroyasu; Otsuka, Teruhito; Yoshikawa, Norihiko; Kanno, Nozomu; Takanashi, Seiji; Oozawa, Yousuke; Hirata, Masahiro; Takeshita, Masayuki; Sakuragi, Kenji; Kurihara, Sayuri; Tsunashima, Yuichiro; Aoki, Naohito; Tanaka, Kento.

:: Journal of Loss Prevention in the Process Industries, 巻 60, 01.07.2019, p. 9-16.

研究成果: Article

Saito, 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, 巻. 60, pp. 9-16. https://doi.org/10.1016/j.jlp.2019.03.011
Saito, Hiroyasu ; Otsuka, Teruhito ; Yoshikawa, Norihiko ; Kanno, Nozomu ; Takanashi, Seiji ; Oozawa, Yousuke ; Hirata, Masahiro ; Takeshita, Masayuki ; Sakuragi, Kenji ; Kurihara, Sayuri ; Tsunashima, Yuichiro ; Aoki, Naohito ; Tanaka, Kento. / Development of a mitigation system against hydrogen-air deflagrations in nuclear power plants. :: Journal of Loss Prevention in the Process Industries. 2019 ; 巻 60. pp. 9-16.
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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

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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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