Comparison on Safety Features among HTGR’s Reactor Cavity Cooling Systems (RCCSs)
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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.
Abstract
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.
참고문헌 (16)
- "Cabinet Decision on the New Strategic Energy Plan"[URL]
- S. Saito, "Design of High Temperature Engineering Test Reactor (HTTR)" (1994), Japan Atomic Energy Research Institute
- Applicability of Design Safety Requirements to Small Modular Reactor Technologies Intended for Near Term Deployment, Light Water Reactors, High Temperature Gas Cooled Reactors, "IAEA", International Atomic Energy Agency, ~, pp.IAEA-TECDOC-1936 (2020)
- K. Takamatsu, "New reactor cavity cooling system with passive safety features using novel shape for HTGRs and VHTRs", Ann. Nucl. Energy, 77, pp.165~171 (2015)[DOI]
- CD-Adapco, "User Guide, STAR-CCM+ Version 12.04, CD-Adapco", ~ (2017)
- K. Takamatsu, "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 convection", Ann. Nucl. Energy, 122, pp.201~206 (2018)[DOI]
- S. Katanishi, "Design study on passive cooling system of the gas turbine high temperature reactor(GTHTR300)", Trans. At. Energy Soc. Jpn, 3(3), pp.257~267 (2004)[DOI]
- K. Takamatsu, "Comparison between passive reactor cavity cooling systems based on atmospheric radiation and atmospheric natural circulation", Ann. Nucl. Energy, 151, pp.107867~ (2021)[DOI]
- K. Takamatsu, "Comparisons between passive RCCSs on degree of passive safety features against accidental conditions and methodology to determine structural thickness of scaled-down heat removal test facilities", Ann. Nucl. Energy, 162, pp.108512~ (2021)[DOI]
- S. Saito, "Role of nuclear energy to a future society of shortage of energy resources and global warming", J. Nucl. Mater, 398, pp.1~9 (2010)[DOI]
- Passive and No-Loss Weather Cap for Protection of Wind Induced Downdraft in Sensitive Exhaust Systems, "D.D. Lisowski", ~, pp.US 2018 (2018), 0017251A1
- "BLINDOCOM TECHNICAL CHART REV. 1 14.04" (2011)[URL]
- "Mini Eurocowl"[URL]
- "Bureau of Meteorology, World’s Record Rainfall"[URL]
- "Airflow Controller"[URL]
- Fire Fighting Tactics under Wind Driven Conditions: Laboratory Experiments, National Institute of Standards and Technology, "D. M. Madrzykowski", ~, pp.NIST Technical Note, 1618 (2009)