Optimization and sensitivity analysis of the nitrogen Brayton cycle as a power conversion system for a sodium-cooled fast reactor

Park, Joo Hyun; Yoon, Jung In; Eoh, Jaehyuk; Kim, Hyungmo; Kim, Moo Hwan

doi:10.1016/j.nucengdes.2018.09.037

Cited by 18 publications

(2 citation statements)

References 18 publications

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“…e feature of fully natural coolant circulation increases the inherent safety performance of SNCLFR-100 under both normal and abnormal operation scenarios. Calculation results [13] show that SNCLFR-100 is able to guarantee a sufficient safety margin for fuel melting and other constrains considered under accidents of unprotected transient overpower and unprotected loss of heat sink [14].…”

Section: Description Of Lead Fast Reactormentioning

confidence: 99%

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Gao

Zhang

et al. 2020

Science and Technology of Nuclear Installations

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Coupling supercritical carbon dioxide (S-CO 2 ) Brayton cycle with Gen-IV reactor concepts could bring advantages of high compactness and efficiency. is study aims to design proper simple and recompression S-CO 2 Brayton cycles working as the indirect cooling system for a mediate-temperature lead fast reactor and quantify the Brayton cycle performance with different heat rejection temperatures (from 32°C to 55°C) to investigate its potential use in different scenarios, like arid desert areas or areas with abundant water supply. High-efficiency S-CO 2 Brayton cycle could offset the power conversion efficiency decrease caused by low core outlet temperature (which is 480°C in this study) and high compressor inlet temperature (which varies from 32°C to 55°C in this study). A thermodynamic analysis solver is developed to provide the analysis tool. e solver includes turbomachinery models for compressor and turbine and heat exchanger models for recuperator and precooler. e optimal design of simple Brayton cycle and recompression Brayton cycle for the lead fast reactor under water-cooled and dry-cooled conditions are carried out with consideration of recuperator temperature difference constraints and cycle efficiency. Optimal cycle efficiencies of 40.48% and 35.9% can be achieved for the recompression Brayton cycle and simple Brayton cycle under water-cooled condition. Optimal cycle efficiencies of 34.36% and 32.6% can be achieved for the recompression Brayton cycle and simple Brayton cycle under dry-cooled condition (compressor inlet temperature equals to 55°C). Increasing the dry cooling flow rate will be helpful to decrease the compressor inlet temperature. Every 5°C decrease in the compressor inlet temperature will bring 1.2% cycle efficiency increase for the recompression Brayton cycle and 0.7% cycle efficiency increase for the simple Brayton cycle. Helpful conclusions and advises are proposed for designing the Brayton cycle for mediate-temperature nuclear applications in this paper.

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Section: Description Of Lead Fast Reactormentioning

confidence: 99%

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Gao

Zhang

et al. 2020

Science and Technology of Nuclear Installations

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“…Recently, there have been several studies of coupling closed Brayton cycles with nuclear reactors. Park et al 17 and Olumayegun et al 18 describe the coupling of a closed nitrogen Brayton cycle with a sodium‐cooled fast reactor (SFR). Ahn and Lee 19 have examined the thermal efficiency of supercritical CO 2 , helium, and nitrogen Brayton cycles for a small modular SFR.…”

Section: Introductionmentioning

confidence: 99%

Technical feasibility of integrating a modified power conversion unit into a non‐nuclear microreactor testbed

Guillen

Wendt

2021

Int J Energy Res

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Summary This work analyzes the feasibility of integrating a modified commercial Capstone C30 microturbine unit into a non‐nuclear testbed developed for performance evaluation of microreactor design concepts. Testing will be conducted to provide detailed reactor core and heat removal section thermal hydraulic performance data for prototypical geometries and operating conditions and demonstrate integration with relevant power conversion units. The modified C30 power conversion unit (PCU) uses external electrical heating, rather than fossil fuel combustion, to provide a maximum power output of ~30 kWe in a closed Brayton cycle (CBC) loop using nitrogen as the working fluid. A 75 kWt electrically heated test article was evaluated as the heat source to provide a turbine inlet temperature of 600°C to the modified C30 PCU. The operation of a test article supplying a maximum thermal power of 250 kWt was also considered. The analyses performed here indicate that the CBC PCU will be capable of operating over a range of steady state and transient conditions to evaluate test article heat transfer performance in representative operational scenarios. Normal, off‐design operation and dynamic stability of the PCU are analyzed, and a proposed set of tests of the power control schemes and heat source‐PCU coupling are outlined. This study supports the timely development of microreactors intended for deployment by the end of this decade.

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Theory of neutron movement

Espinosa-Paredes¹

2021

Fractional-Order Models for Nuclear Reactor Analysis

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Optimization and sensitivity analysis of the nitrogen Brayton cycle as a power conversion system for a sodium-cooled fast reactor

Cited by 18 publications

References 18 publications

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Technical feasibility of integrating a modified power conversion unit into a non‐nuclear microreactor testbed

Theory of neutron movement

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Optimization and sensitivity analysis of the nitrogen Brayton cycle as a power conversion system for a sodium-cooled fast reactor

Cited by 18 publications

References 18 publications

Supercritical CO2 Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Supercritical CO2 Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Technical feasibility of integrating a modified power conversion unit into a non‐nuclear microreactor testbed

Theory of neutron movement

Contact Info

Product

Resources

About

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver

Supercritical CO₂ Brayton Cycle Design for Small Modular Reactor with a Thermodynamic Analysis Solver