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Digital archive of theses discussed at the University of Pisa

 

Thesis etd-01312020-154916


Thesis type
Tesi di dottorato di ricerca
Author
MARINARI, RANIERI
URN
etd-01312020-154916
Thesis title
Numerical and experimental characterization of heavy liquid metal cooled bundles
Academic discipline
ING-IND/19
Course of study
INGEGNERIA INDUSTRIALE
Supervisors
tutor Prof. Forgione, Nicola
relatore Dott. Martelli, Daniele
relatore Dott. Di Piazza, Ivan
Keywords
  • ALFRED
  • CFD
  • experiments
  • GEN-IV
  • heavy liquid metals
  • LFR
Graduation session start date
18/02/2020
Availability
Withheld
Release date
18/02/2026
Summary
The focus of the present research activity was the experimental and numerical investigation of some thermal-hydraulic phenomena peculiar of the heavy liquid metal cooled systems like Lead Fast Reactors. The two activities were carried out in parallel during the three-year research period and performed mainly at the Experimental Thermo-fluid-dynamic Laboratory of ENEA Brasimone R.C., in the framework of a collaboration between ENEA and the Department of Civil and Industrial Engineering of the University of Pisa.
The main thermal-hydraulic aspects investigated were the core coolability during normal conditions in wire-wrap and grid spaced bundles and coolability during a specific accident condition called “flow blockage accident”. The experimental activity had two main focuses: the evaluation of heat transfer coefficients in a grid spaced bundle cooled by heavy liquid metal and the evaluation of the thermal-hydraulic field in a grid-spaced bundle affected by different degrees of internal blockage.
The numerical activities concerned pre-test and post-test CFD studies, on three different test sections installed in the two HLM cooled facilities at ENEA Brasimone (NACIE-UP and CIRCE). Pre-test CFD simulations were developed for the Blockage Fuel Pin Simulator test section installed in the NACIE-UP facility for the optimization of TCs position near the blockage. Post-test CFD analyses were developed looking for a preliminary assessment of CFD code capabilities and limitations.
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