Experimental and Numerical Results of LIFUS5/Mod3 Series E Test on In-Box LOCA Transient for WCLL-BB

Marica Eboli, Francesco Galleni, Nicola Forgione, Nicolò Badodi, Antonio Cammi and Alessandro Del Nevo
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Marica Eboli: Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Department of Fusion and Technology for Nuclear Safety and Security, 40032 Camugnano, Italy
Francesco Galleni: Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy
Nicola Forgione: Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy
Nicolò Badodi: Department of Energy, Politecnico di Milano, 20156 Milano, Italy
Antonio Cammi: Department of Energy, Politecnico di Milano, 20156 Milano, Italy
Alessandro Del Nevo: Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Department of Fusion and Technology for Nuclear Safety and Security, 40032 Camugnano, Italy

Energies, 2021, vol. 14, issue 24, 1-30

Abstract: The in-box LOCA (Loss of Coolant Accident) represents a major safety concern to be addressed in the design of the WCLL-BB (water-cooled lead-lithium breeding blanket). Research activities are ongoing to master the phenomena and processes that occur during the postulated accident, to enhance the predictive capability and reliability of numerical tools, and to validate computer models, codes, and procedures for their applications. Following these objectives, ENEA designed and built the new separate effects test facility LIFUS5/Mod3. Two experimental campaigns (Series D and Series E) were executed by injecting water at high pressure into a pool of PbLi in WCLL-BB-relevant parameter ranges. The obtained experimental data were used to check the capabilities of the RELAP5 system code to reproduce the pressure transient of a water system, to validate the chemical model of PbLi/water reactions implemented in the modified version of SIMMER codes for fusion application, to investigate the dynamic effects of energy release on the structures, and to provide relevant feedback for the follow-up experimental campaigns. This work presents the experimental data and the numerical simulations of Test E4.1. The results of the test are presented and critically discussed. The code simulations highlight that SIMMER code is able to reproduce the phenomena connected to PbLi/water interaction, and the relevant test parameters are in agreement with the acquired experimental signals. Moreover, the results obtained by the first approach to SIMMER-RELAP5 code-coupling demonstrate its capability of and strength for predicting the transient scenario in complex geometries, considering multiple physical phenomena and minimizing the computational cost.

Keywords: SIMMER code; RELAP5 code; in-box LOCA; WCLL breeding blanket; LIFUS5/Mod3 (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: 2021
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