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IL SISTEMA DI CALCOLO MODULARE

ERANOS

(EUROPEAN REACTOR ANALYSIS OPTIMIZED SYSTEM)

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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

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• 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

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• 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)

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• 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 ... ;

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• MEDIUM_CREATION general

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• MEDIUM_CREATION simple material

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• MEDIUM_CREATION mixed material

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• MEDIUM_CREATION medium

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• MEDIUM_CREATION homogenous cell

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