Hydrogen production methods efficiency coupled to an advanced high-temperature accelerator driven system Daniel Gonz  alez Rodrı´guez a,* , Carlos Alberto Brayner de Oliveira Lira b , Carlos Rafael Garcı´a Hern  andez c , Fernando Roberto de Andrade Lima a a Centro Regional de Ci^ encias Nucleares Do Nordeste CRCN-NE, Avenida Professor Luiz Freire, 1000 50740-535 Recife, PE, Brazil b Departamento de Energı´a Nuclear, Universidade Federal de Pernambuco, Avenida Professor Luiz Freire, 1000 50740-535 Recife, Brazil c Instituto Superior de Tecnologı´as y Ciencias Aplicadas (InSTEC/CUBA), Av. Salvador Allende Esq, Luaces 10400 La Habana, Cuba article info Article history: Received 26 July 2018 Received in revised form 31 October 2018 Accepted 11 November 2018 Available online xxx Keywords: Nuclear hydrogen production ADS HTE Sulfur-iodine Efficiency Cost estimative abstract Hydrogen, rather than oil, must be produced in volumes not provided by the currently employed methods. In this work, two high-temperature hydrogen production methods coupled with an advanced nuclear system are presented. A new design of a pebble-bed accelerator nuclear-driven system called TADSEA (Transmutation Advanced Device for Sustainable Energy Applications) was chosen because of the advantages in transmutation and safety. A detailed flowsheet of the high-temperature electrolysis process coupled to TADSEA through a Brayton gas cycle was developed using chemical process simulation software: Aspen HYSYS ® . It is obtained 0.1627 kg/s of hydrogen with the model with optimized operating conditions, resulting in an overall process efficiency of 34.51%, a value in the range of results reported by other authors. A conceptual design of a plant using the iodine-sulfur thermochemical water splitting cycle was carried out producing 5.66e-2 kg/s and electric energy in cogeneration. The overall efficiency was calculated performing an energy balance resulting in 22.56%. A brief hydrogen production cost estimation was per- formed for both methods obtaining 5.96$/kg for the sulfur-iodine (SI) and 4.8 $/kg for the high-temperature electrolysis (HTE) process. © 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Introduction Hydrogen is considered as the basis of the near future energy system. The progressive replacement of oil can help reduce the environmental impacts associated with the production and use of it. Hydrogen combustion does not produce green- house gases, but the application of hydrogen in the future will be as an energy carrier rather than fuel [1]. An energy carrier is a substance that can store energy so that it can be later consumed in a controlled manner. The energy carriers differ from the primary energy sources because they need to be * Corresponding author. E-mail addresses: danielgonro@gmail.com (D. Gonz alez Rodrı´guez), cabol@ufpe.br (C.A. Brayner de Oliveira Lira), cgh@instec.cu (C.R. Garcı´a Hern andez). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/he international journal of hydrogen energy xxx (xxxx) xxx https://doi.org/10.1016/j.ijhydene.2018.11.083 0360-3199/© 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Please cite this article as: Gonz alez Rodrı´guez D et al., Hydrogen production methods efficiency coupled to an advanced high-tem- perature accelerator driven system, International Journal of Hydrogen Energy, https://doi.org/10.1016/j.ijhydene.2018.11.083