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MILIPOSO, Mock-up of the Diagrid and the Coupling Pipes in Support of the ASTRID SFR Program

Abstract : The CEA and several industrial partners are involved in the development of a 4th generation reactor cooled by sodium, ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration). From the 90's EFR project, the Phoenix and Super-Phoenix reactors operation feedback, the CEA has acquired a very significant experience about Sodium Fast Reactors (SFR). A new generation of simulation codes is used for the reactor design and the safety issues. Due to the physical complexity, the models need experimental validations in reduced scaled mock-up. In those purposes, a thermal-hydraulic loop, the PLATEAU facility, has been developed and built at the CEA Cadarache to study different ASTRID mock-ups under various operating conditions. Currently, 4 mock-ups are identified the MICAS model devoted to study the free surface and the flow pattern in the upper plenum, the MICONOS mock-up dedicated to the investigation of natural convection issue in the entire pool reactor, the MISHOCO model used to analyze specific issues at a higher scale in the upper plenum, and the MILIPOSO mock-up dedicated to the study of diagrid flows and the primary coupling pipes between the pump and the diagrid.This article presents the MILIPSO model the identified ASTRID reactor issues, the sizing, the design and the instrumentation. Dimensionless analysis was employed to define the reduced scale and the experimental operating conditions regarding the specific issues to investigate. This mock-up is built in transparent polymer to carry out some optical measurements such as laser velocimetry and fast video. It was designed as versatile as possible to study the effect of the dimensionless numbers on the flow pattern. Some geometrical features were simplified because of the reduced scale. The hexagonal assemblies were replaced by cylindrical tubes. To observe the right flow-rate map at the diagrid exit, different sized diaphragms were used at the assemblies outlet. The experimental program includes nominal and accidental operating conditions, cavitation studies in the primary coupling pipes, gas accumulation investigations in the diagrid. The instrumentation is based on pressure sensors at various model locations, laser Doppler velocimetry and Particles Image Velocimetry to measure respectively the velocity in the diagrid and in the primary coupling pipes.
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Submitted on : Friday, December 13, 2019 - 2:46:05 PM
Last modification on : Tuesday, April 28, 2020 - 11:28:14 AM

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  • HAL Id : cea-02339122, version 1

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D. Guenadou, P. Aubert, J.-P. Descamps. MILIPOSO, Mock-up of the Diagrid and the Coupling Pipes in Support of the ASTRID SFR Program. NUTHOS12, Oct 2018, Qingdao, China. ⟨cea-02339122⟩

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