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_use the equilibrium pressure in the DC vessel is lower, analyses indicate that the SC and IDC have longer and higher initial depressurization rates to the VLPC than the DC. This results in higher releases. Since the temperature effects dominate, both GT-MHR plants will have releases higher than the SC plants. However, the lower equilibrium pressure in the DC will result in lower releases than projected for the IDC. urbomachinery Failures (DC) Turbomachinery failure was assessed for the DC design, due to the location of the turbomachine in the primary system.
21 129% 18 133% 17 134% FUEL HANDLING & STORAGE SYSTEM TURBINE PLANT EQUIPMENT 7 106% 5 97% 1 60% NI BUILDINGS & STRUCTURES ECA BUILDINGS & STRUCTURES 20 4 126% 100% 20 3 129% 121% 20 1 126% 157% PLANT AIR, WATER & SERVICE SYS. PLANT ELECTRICAL & SECURITY SYS. 11 11 109% 121% 9 10 118% 121% 8 9 122% 124% DESIGN MGT. 32 1 108°/o SUBTOTAL DESIGN TOTAL DEVELOPMENT "' t FACTOR RELATIVE TO SC I E-25 safety, performance and economics. After further evaluation, it was concluded that the DC, while posing the greater development challenge, offers convincing economic incentives, along with a potential for future growth as the technology evolves.
The probability of failure should be even lower in the GT-MHR, since the operating E-15 environment is relatively benign and failure modes related to fuel combustion systems and turbine hot section overheating, which represent the majority of failures for conventional turbomachines, are not a factor in the GT-MHR. The containment of missiles generated by turbomachineryrelated failures is considered manageable. A containment design similar to that proposed for the DC was used in the Fort St. Vrain circulator.