1/21/2024 0 Comments Liquid metal cooled reactor![]() ![]() A peak cladding temperature of 650 C has been used as a goal at this temperature, a reactor core outlet temperature of 564 C is achieved resulting in a Brayton cycle efficiency of 44.2 % and a net plant efficiency of 43.8 %. Conversion of the core thermal energy to electricity is accomplished using a supercritical carbon dioxide (S-CO Brayton cycle. The whole core is a single removable assembly with a long lifetime (30 years) at which time refueling equipment is brought onsite. The Pb coolant flows upward through the core which is an open-lattice of large-diameter (2.5 centimeter) fuel pins containing transuranic nitride pellets clad bonded with liquid Pb to silicon-enhanced ferritic/martensitic (F/M) stainless steel arranged on a triangular pitch with spacing maintained by grid spacers the core does not incorporate removable fuel assemblies as one means of restricting access to the fuel. The SSTAR pre-conceptual design integrates three major features: primary coolant natural circulation heat transport lead (Pb) coolant and transuranic nitride fuel in a pool vessel configuration. Customers of SSTAR include: (1) clients looking for energy security at small more » capital outlay (2) cities in developing nations and (3) deregulated independent power producers in developed nations. SSTAR is a small, 20 MWe (45 MWt), exportable, natural circulation, fast reactor plant concept incorporating proliferation resistance for deployment in non-fuel cycle states and developing nations, fissile self-sufficiency for efficient utilization of uranium resources, autonomous load following making it suitable for small or immature grid applications, and a high degree of passive safety. Significant progress and improvements have been made on development of a pre-conceptual design of the Secure Transportable Autonomous Reactor (SSTAR) Lead-Cooled Fast Reactor (LFR) concept since it was last reported on at ICAPP 05. A dual passive cooling system for liquid metal cooled nuclear fission reactors is described, comprising the combination of: a reactor vessel for containing a pool of liquid metal coolant with a core of heat generating fissionable fuel substantially submerged therein, a side wall of the reactor vessel forming an innermost first partition a containment vessel substantially surrounding the reactor vessel in spaced apart relation having a side wall forming a second partition a first baffle cylinder substantially encircling the containment vessel in spaced apart relation having an encircling wall forming a third partition a guard vessel substantially surrounding the containment more » vessel and first baffle cylinder in spaced apart relation having a side wall forming a forth partition a sliding seal at the top of the guard vessel edge to isolate the dual cooling system air streams a second baffle cylinder substantially encircling the guard vessel in spaced part relationship having an encircling wan forming a fifth partition a concrete silo substantially surrounding the guard vessel and the second baffle cylinder in spaced apart relation providing a sixth partition a first fluid coolant circulating flow course open to the ambient atmosphere for circulating air coolant comprising at lent one down comer duct having an opening to the atmosphere in an upper area thereof and making fluid communication with the space between the guard vessel and the first baffle cylinder and at least one riser duct having an opening to the atmosphere in the upper area thereof and making fluid communication with the space between the first baffle cylinder and the containment vessel whereby cooling fluid air can flow from the atmosphere down through the down comer duct and space between the forth and third partitions and up through the space between the third and second partition and the riser duct then out into the atmosphere and a second fluid coolant circulating flow. ![]()
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