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IL SISTEMA DI CALCOLO MODULARE ERANOS ( E UROPEAN R EACTOR AN ALYSIS O PTIMIZED S YSTEM)

IL SISTEMA DI CALCOLO MODULARE ERANOS ( E UROPEAN R EACTOR AN ALYSIS O PTIMIZED S YSTEM). 1. Lattice calculation with ECCO Summary Basic reactor modeling: medium set creation operating conditions ECCO sentence and steps basic set creation for core calculation

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IL SISTEMA DI CALCOLO MODULARE ERANOS ( E UROPEAN R EACTOR AN ALYSIS O PTIMIZED S YSTEM)

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  1. IL SISTEMA DI CALCOLO MODULAREERANOS(EUROPEAN REACTOR ANALYSIS OPTIMIZED SYSTEM)

  2. 1. Lattice calculation with ECCO • Summary • Basic reactor modeling: • medium set creation • operating conditions • ECCO sentence and steps • basic set creation for core calculation • Advanced topics: • heterogeneous cells • ECCO routes • ECCO step options

  3. Modeled Reactor • Na-cooled (U,Pu)O2 fast reactor1250 MW (thermal) / 500 MW (electric) • Fuel S/A geometric data: • •169-pin bundle ; pin pitch = 0.878 cm • •Hexagonal wrapper across-flats = 11.65 cm (inner) x 12.37 cm (outer) • •S/A pitch = 12.87 cm ; Fissile height= 100 cm • •Integrated axial blankets (same geometryas fissile) • •Lower/upper axial blanket height= 25/25 cm • •Numberof fuel S/Asis the core= 255 • Fertile S/A geometric data: • •61-pin bundle ; pin pitch = 1.445 cm • •Spacer wire diameter= 0.187 cm • •Hexagonal wrapper across-flats = 11.65 cm (inner) x 12.37 cm (outer) • •S/A pitch = 12.87 cm Fertile height= 150 cm

  4. Module sequence • MEDIUM_CREATION to create materials, medium and cells: • •MEDIUM set (output) • •Cell description needs medium • •Medium description needs materials • A medium is a homogeneous collection of materials with volume fractions. • A cell is a collection of media with geometrical links with each other. • OPERATING_CONDITION to expand medium (optional): • MEDIUM set (input and output) • ECCO to perform lattice calculation: • MEDIUM set (input) • Ecco files (output) • BASIC_EDL_CREATION_FROM_ECCO_FILE to create edl: • MEDIUM set (input and output) • Ecco files (input) • MICRO and MACRO set (output)

  5. Global Data • !---> EINT/EEXT = inner/outer volume (Pu+Am)O2/(U+Pu+Am)O2 in % • ->EINT (25.0*0.74) ; • ->EEXT 25.0 ; • !---> expansion coefficients : • ->OXIDE_DIL 100 1.0528E-05 200 1.0553E-05 ... ; • ->STEEL_DIL 100 1.707E-05 200 1.740E-05 ...; • ->SODIUM_DIL 100 8.65600E-5 200 8.90300E-5 ...; • ->B4C_DIL 100 0.4344E-5 200 0.4468E-5 ...; • !---> lists for (initial) trace nuclides : • ->HN_TRACES • 'U234' 1.0E-15 'U235' 1.0E-15 'U236' 1.0E-15 'U238' 1.0E-15 ... ;

  6. MEDIUM_CREATION general

  7. MEDIUM_CREATION simple material

  8. MEDIUM_CREATION mixed material

  9. MEDIUM_CREATION medium

  10. MEDIUM_CREATION homogenous cell

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