Throughout the world, interest is moving towards small modular reactor systems.
Although most currently proposed designs have succeeded in decreasing the size, they have not been able to completely modularize the whole reactor. To break these limits, the supercritical CO2 Brayton cycle was chosen over the steam Rankine cycle as the power generation cycle. Also, the proposed reactor is a gas cooled reactor that can run without refueling for 20 years. The power generation cycle is integrated with the reactor to further modularize it.
To guarantee its safety over a long operational time, new designs that have not been used in conventional large reactors were adopted in the power generation system.
The development of the proposed reactor will allow nuclear power to contribute not only in power generation but also in energydependent industries like offshore plants, the heavy chemical industry, and the steel industry, which would ultimately reduce greenhouse gas emissions. Furthermore, an energy supply for extreme environments (polar areas, deserts, space, etc.) will be available for long periods of time.
Existing small modular reactor designs usually use water as coolant and oxidized uranium as fuel. Although these may be good choices in making large reactors economical, there are economical limits when the capacity is reduced.
The present research aims to overcome these issues by adopting a supercritical CO2 cooled micro modular reactor (KAIST MMR) concept that uses a long period core, which runs for more than 20 years without refueling, with supercritical CO2 as coolant and uranium-nitride as fuel. Also, by actively adopting the supercritical CO2 power system, designated as one of top 13 industry engine projects, a research team comprised of Prof. simplified the power conversion system and developed a new nuclear power system that can passively remove the decay heat in the case of reactor shutdown to avoid another Fukushima accident.
The team’s main research achievement, the feasibility of downsizing and modularization of nuclear power plants, was confirmed by designing the reactor core and power generation system in one vessel.
Also, in terms reactor design, uranium-nitride, suitable for long period low enriched uranium fast reactors, was selected, and the dynamic properties and variables for nuclear reactor control were designed and evaluated. In the power generation system, the small sizing and high efficiency advantage of the supercritical CO2 power conversion system was actively utilized to create a very simple and high efficiency system. Moreover, PCHE, a next generation heat exchanger that adopts the semiconductor manufacturing process, was used, and the technical accomplishment of using radial urbo machinery, which is not used for large reactors, was achieved.
As seen in the Fukushima accident, nuclear reactors produce large amounts of decay heat even after shutdown, and if external power source is not provided, catastrophes can happen. To avoid such outcomes, the proposed KAIST MMR (Micro Modular Reactor) consists of a passive heat removal system that can cool the reactor with natural circulation in case of reactor shutdown.
Learn more: Supercritical CO2-cooled micro modular reactor
The Latest on: Supercritical CO2-cooled micro modular reactor
via Google News
The Latest on: Supercritical CO2-cooled micro modular reactor
- Skid Mounted Process Equipment Supplierson November 26, 2019 at 4:00 pm
Custom manufacturer of automated process skids for the brewery, food, chemical, energy, beverage and pharmaceutical industries. Various types include aeration, deaeration, carbonation, decarbonation, ...
- Reactors Suppliers serving Western Pennsylvaniaon November 18, 2019 at 4:00 pm
Design, fabrication and installation of fluidized bed reactors. Refractories, burners, heat exchangers, boilers, blowers, valves, controllers, recorders and switches also available. Mechanical and ...
- Process Systems, Reaction Engineering, and Molecular Thermodynamicson February 24, 2019 at 4:00 pm
Focus areas include novel reactor designs, such as catalytic and membrane reactors, micro-reactors, and atomic layer deposition systems; studies of reactions in supercritical fluids ... that enable ...
- Supercomputing simulations and machine learning help improve power plantson August 20, 2018 at 9:42 am
Researchers are exploring how supercritical carbon dioxide could serve as a cleaner, safer, and more flexible working fluid in power plants than supercritical water by using supercomputing resources ...
- Very small modular nuclear fission reactors for military and space applicationson July 11, 2017 at 1:21 am
The turbine-generator assembly is directly coupled. The Holos Reactor: A Distributable Power Generator with Transportable Subcritical Power Modules Public Description: Holos is a distributable modular ...
- Green: Sunny days ahead for clean energyon April 9, 2017 at 7:49 pm
So we chalk out a robust roadmap for this transition: commissioning large renewable energy resources, replacing old coal thermal power plants with supercritical ... Fast Reactors. The third strategy ...
- Water cooled reactorson August 31, 2016 at 11:29 am
Water cooled reactors have played a significant role in ... testing and construction of small modular, factory-built integral pressurized water reactors. While a number of advanced WCRs are currently ...
- Supercritical CO2-cooled micro modular reactoron March 9, 2016 at 4:14 am
Although these may be good choices in making large reactors economical, there are economical limits when the capacity is reduced. The presentresearch aims to overcome these issues by adopting a ...
- Supercritical CO2-cooled micro modular reactoron March 8, 2016 at 4:00 pm
A research team has suggested an innovative concept of a reactor cooled by supercritical state carbon dioxide (S-CO2). The core has long life (20 years) without refueling as well as inherent safety ...
- February 2011 Technology News: Pittcon 2011 Previewon February 16, 2011 at 4:00 pm
For proprietary Monowave 300 microwave synthesis reactor Up to 24 vials of various sizes can be queued and processed in three different carousel types Features a fail-safe gripper driven by compressed ...
via Bing News