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Innovative reactor cavity cooling system using passive radiative cooling to prevent meltdowns

Research Project

Project/Area Number 18K05000
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Takamatsu Kuniyoshi  国立研究開発法人日本原子力研究開発機構, 高速炉・新型炉研究開発部門 大洗研究所 高温ガス炉研究開発センター, 研究副主幹 (70414547)

Co-Investigator(Kenkyū-buntansha) 守田 幸路  九州大学, 工学研究院, 教授 (40311849)
劉 維  九州大学, 工学研究院, 准教授 (70446417)
松元 達也  九州大学, 工学研究院, 助教 (90325514)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords格納容器 / 冷却設備 / 受動的安全性 / 輻射 / 自然対流 / 高温ガス炉 / HTGR / 新型炉 / 原子力工学 / 熱工学 / 伝熱 / ふく射 / 対流
Outline of Final Research Achievements

In this study, we quantitatively clarified the cooling capability of a reactor cavity cooling system (RCCS) using passive radiative cooling with a completely new geometry through analyses and experiments. When the air in the heat transfer test apparatus (scale model) cannot be pressurized, which is equally scaled down from the actual RCCS, it was also determined that the scale model can reproduce the heat flux of the actual RCCS. This is true even when the Rayleigh or Grashof numbers are not the same between the actual RCCS and the scale model. Results of this basic research showed that the sufficient heat removal performance of the RCCS can be demonstrated. In addition, when a strong wind (typhoon) occurs under the design basis, it was determined that a second RCCS, which uses the chimney effect to promote natural circulation of ambient air, cannot reliably guarantee the passive safety of the reactor.

Academic Significance and Societal Importance of the Research Achievements

【学術的意義】全く新しい形状を採用したRPV冷却設備について、放射冷却でどこまで受動的に冷却できるのかを、解析及び実験で定量的に明らかにし、除熱性能が十分あることを実証した。また、実機のRPV冷却設備を等倍縮小したスケールモデルを製作し、内部の空気を加圧できない場合でも、実機の熱流束をスケールモデルで再現できることを明らかにした。
【社会的意義】放射冷却を利用したRPV冷却設備は、自然現象や事故事象の影響を受け難く、炉心のメルトダウンも起こりえない、最も信頼性の高い革新的RPV冷却設備となった。このRPV冷却設備を採用することで、世界で最も安全な原子炉システムを創出することができる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (7 results)

All 2021 2019 2018

All Journal Article (4 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Comparison between passive reactor cavity cooling systems based on atmospheric radiation and atmospheric natural circulation2021

    • Author(s)
      Takamatsu Kuniyoshi、Matsumoto Tatsuya、Liu Wei、Morita Koji
    • Journal Title

      Annals of Nuclear Energy

      Volume: 151 Pages: 107867-107867

    • DOI

      10.1016/j.anucene.2020.107867

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Comparative methodology between actual RCCS and downscaled heat-removal test facility2019

    • Author(s)
      Takamatsu Kuniyoshi、Matsumoto Tatsuya、Liu Wei、Morita Koji
    • Journal Title

      Annals of Nuclear Energy

      Volume: 133 Pages: 830-836

    • DOI

      10.1016/j.anucene.2019.07.025

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Improvement of heat-removal capability using heat conduction on a novel reactor cavity cooling system (RCCS) design with passive safety features through radiation and natural convection2018

    • Author(s)
      Takamatsu Kuniyoshi、Matsumoto Tatsuya、Liu Wei、Morita Koji
    • Journal Title

      Annals of Nuclear Energy

      Volume: 122 Pages: 201-206

    • DOI

      10.1016/j.anucene.2018.08.047

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 6-4 受動的放射冷却を用いた高温ガス炉の冷却設備を開発-事故時崩壊熱除去方法の概念成立に向けて-2018

    • Author(s)
      高松邦吉
    • Journal Title

      原子力機構の研究開発成果 2018-19

      Volume: - Pages: 67-67

    • Related Report
      2018 Research-status Report
    • Open Access
  • [Presentation] ふく射を利用した原子炉キャビティ冷却シスムの伝熱特性に関する研究2019

    • Author(s)
      西森友弥、明石知泰、宇和田尚悟、松元達也、劉維、守田幸路、高松邦吉
    • Organizer
      日本原子力学会 九州支部 第38回 研究発表講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Experimental study on heat removal performance of a new reactor cavity cooling system (RCCS)2018

    • Author(s)
      Hosomi Seisuke、Akashi Tomoyasu、Matsumoto Tatsuya、Liu Wei、Morita Koji、Takamatsu Kuniyoshi
    • Organizer
      The 11th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS11)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高温ガス炉における受動的冷却設備の伝熱特性に関する検討2018

    • Author(s)
      明石知泰、細見成祐、井福弘基、松元達也、劉維、守田幸路、高松邦吉
    • Organizer
      日本原子力学会 九州支部 第37回 研究発表講演会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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