Water Chemistry Impact on Activated Corrosion Products: An Assessment on Tokamak Reactors

Martina Molinari (), Matteo D’Onorio, Giovanni Mariano, Nicholas Terranova and Gianfranco Caruso ()
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Martina Molinari: Department of Astronautical, Electrical and Energy Engineering (DIAEE)—Nuclear Section, Sapienza University of Rome, Corso Vittorio Emanuele II 244, 00186 Rome, Italy
Matteo D’Onorio: Department of Astronautical, Electrical and Energy Engineering (DIAEE)—Nuclear Section, Sapienza University of Rome, Corso Vittorio Emanuele II 244, 00186 Rome, Italy
Giovanni Mariano: ENEA Fusion and Technology for Nuclear Safety and Security Department, CR Frascati, Via Enrico Fermi 45, 00044 Frascati, Italy
Nicholas Terranova: ENEA Fusion and Technology for Nuclear Safety and Security Department, CR Frascati, Via Enrico Fermi 45, 00044 Frascati, Italy
Gianfranco Caruso: Department of Astronautical, Electrical and Energy Engineering (DIAEE)—Nuclear Section, Sapienza University of Rome, Corso Vittorio Emanuele II 244, 00186 Rome, Italy

Energies, 2023, vol. 16, issue 12, 1-15

Abstract: Activated Corrosion Product (ACP) formation and deposition pose a critical safety issue for nuclear fusion reactors. The working fluid transports the ACPs towards regions accessible by worker personnel, i.e., the steam generator. The code OSCAR-Fusion has been developed by the CEA (France) to evaluate the ACP generation and transport in closed water-cooled loops for fusion application. This work preliminary assesses the impact of water chemistry on the transport, precipitation, and deposition of corrosion products for the EU-DEMO divertor Plasma Facing Unit Primary Heat Transfer System. Sensitivity analyses and uncertainty quantification are needed due to the multi-physics phenomena involved in ACP formation and transport. The OSCAR-Fusion/RAVEN code coupling developed by the Sapienza University of Rome and ENEA are used. This work presents the perturbation results of different parameters chosen for a closed water-cooled loop considering a continuous scenario of 1888 days. The aim of this work is to preliminarily assess the variation of build-up of ACPs, perturbing the alkalizing agent concentration into the coolant, and the corrosion and release rates of different materials. The assessment of ACP formation deposition and transport is fundamental for source term identification, reduction of radiation exposure assessment, maintenance plan definition, design optimization, and waste management.

Keywords: Activated Corrosion Products; water chemistry; OSCAR; RAVEN; nuclear safety (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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