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4091863 
Technical Report 
High Temperature Gas-Cooled Reactors Lessons Learned Applicable to the Next Generation Nuclear Plant 
Beck, JM; Pincock, LF 
2011 
NTIS/13120082 
GRA and I 
GRA and I 
Over the past five decades, high temperature gas-cooled reactors (HTGRs) have been designed and operated throughout the world. To date, seven HTGR plants (depicted in Figure ES-1) have been built and operated: Dragon (United Kingdom), Arbeitsgemeinschaft Versuchsreaktor (Germany), High Temperature Test Reactor (Japan), High Temperature Reactor-10 (HTR-10; Peoples Republic of China), Peach Bottom 1 (United States), Thorium Hochtemperatur Reaktor (Germany), and Fort St. Vrain (United States). Although these seven HTGRs vary in size, outlet temperature, primary fluid, and purpose, there is much the Next Generation Nuclear Plant (NGNP) Project has learned and can still learn from these reactors. This lessons learned report categorizes design, construction, and operational experiences from these reactors.