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Performance assessment of indirect Brayton power cycles for high-temperature gas-cooled nuclear reactors

Pubblicazione


Autore: J.I. Linares, L.E. Herranz, B.Y.Moratilla, R. Lopez

Collana: BT - 34 - Mag 06 - Energy: production, distribution and conservation

Note:
Search for a sustainable energy system has driven nuclear engineering towards what has been termed Generation IV. One of the main objectives of these innovative nuclear designs is to reach a high power cycle efficiency. This way a substantial fuel saving and waste reduction would be achieved, which would enhance the nuclear kWh competitiveness.
This paper investigates the thermal performance of helium cooled power cycles based on the characteristic working parameters of Very High Temperature Reactor systems. A PBMR reactor with indirect inter-cooled (three compression stages) and recuperative cycle layout has been analyzed. A thermal efficiency over 49% has been found, and though a sensitivity analysis the main variables and components of the power cycle have been identified. More importantly, the study has demonstrated the good layout performance under both base and load-follow operation modes. The key cycle parameter has been identified to be the ratio of the primary to secondary mass flow rate.


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