Nuclear Engineering and Technology

  • 제56권3호
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  • Pages.832-845
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  • 2024
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Comparison on Safety Features among HTGR's Reactor Cavity Cooling Systems (RCCSs)

  • Kuniyoshi Takamatsu (Reactor Systems Design Department, Sector of Fast Reactor and Advanced Reactor Research and Development, Japan Atomic Energy Agency) ;
  • Shumpei Funatani (Department of Mechanical Engineering, University of Yamanashi)
  • 투고 : 2023.05.17
  • 심사 : 2023.09.30
  • 발행 : 2024.03.25
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초록

Reactor cavity cooling systems (RCCSs) comprising passive safety features use the atmosphere as a coolant, which cannot be lost. However, their drawback is that they are easily affected by atmospheric disturbances. To realize the commercial application of the two types of passive RCCSs, namely RCCSs based on atmospheric radiation and atmospheric natural circulation, their safety must be evaluated, that is, they must be able to remove heat from the reactor pressure vessel (RPV) surface at all times and under any condition other than under normal operating conditions. These include both expected and unexpected natural phenomena and accidents. Moreover, they must be able to eliminate the heat leakage emitted from the RPV surface during normal operation. However, utilizing all of the heat emitted from the RPV surface increases the degree of waste heat utilization. This study aims to understand the characteristics and degree of passive safety features for heat removal by comparing RCCSs based on atmospheric radiation and atmospheric natural circulation under the same conditions. It was concluded that the proposed RCCS based on atmospheric radiation has an advantage in that the temperature of the RPV could be stably maintained against disturbances in the ambient air.

키워드

과제정보

This work was supported by JSPS KAKENHI Grant Number JP22K04628. The authors express their gratitude to Dr. Minoru Goto and ME Yukio Tachibana at JAEA, as well as Dr. Thomas Y. C. Wei, Dr. Rui Hu, and Dr. Darius D. Lisowski at ANL for the valuable comments and advice provided throughout this research.

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