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• W2304018397 abstract "A metallic sodium LMFBR (Liquid Metal Fast Breeder Reactor) can sustain a full power SCRAM shutdown using only natural convection after SCRAM. A venturi DRAC allows this mode change without any active fluid control elements. Venturi DRAC is Direct Reactor Auxiliary Cooling that uses venturi flow control elements. Each venturi DRAC low-pressure side port is connected to a DRAX (Direct Reactor Auxiliary eXchanger) outlet. Primary sodium flow path is from core exit to DRAX inlet, DRAX outlet to venturi side port, out the venturi and back to core. A separate Na or NaK secondary loop transfers heat from DRAX to an external heat sink. Venturi DRAC primary flow path is in parallel with reactor power-production primary sodium flow. Flow is always into the venturi side port. Venturi DRAC primary and secondary circuit flow rates are approximately the same at full power (Mode 1) they are during decay heat removal (Mode 3). DRAX flow is forced by eduction at power and maintained by natural conduction during decay heat removal. At power (Mode 1) DRAC venturi mixes DRAX cold discharge with core feed. A venturi DRAC that has both driver and blanket sodium going through its nozzle at power is referred to as a driver venturi DRAC. Driver venturi DRAC exploits reduced blanket plenum pressure for boundary layer control. Driver venturi DRAC nominal decay heat removal power is between 1% and 3% full core power. DRAC nominal power is the DRAC natural-convection heat transfer rate at full-power bulk temperatures. By definition, maximum core power depends inversely on DRAC nominal decay heat removal capability. A constant-temperature SCRAM requirement makes maximum core power depends on (Core Temperature Rise)^(1 + 1/n). Exponent n ranges from 1.75 to 2, depending on fuel pressure drop characteristics. Remaining DRAC parameters, including full- power pressure drop, influence core design power by exponent 1/n. Venturi DRAC rejects heat at a constant rate regardless of core power. Shutdown decay heat removal is done using only venturi DRAC and primary sodium. Not using secondary loop decay heat removal allows increasing core temperature rise at power. SCRAM thermal shock is mitigated by maintaining secondary loop temperatures. Steam cycle is controlled to mitigate SCRAM thermal shock. Core inlet temperature is optimized for maximum electricity production. Driver venturi DRAC allows licensing without requiring IHX (Intermediate Heat Exchanger) integrity. Ease of licensing allows LMFBR deployment starting y-2035. Each LMFBR delays CO2 doubling one week, irrespective of uranium resource." @default.
• W2304018397 created "2016-06-24" @default.
• W2304018397 creator A5007053835 @default.
• W2304018397 date "2006-01-01" @default.
• W2304018397 modified "2023-09-24" @default.
• W2304018397 title "Automatic DRAC LMFBR to Speed Licensing and Mitigate CO2" @default.
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• W2304018397 hasPublicationYear "2006" @default.
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