HEAT TRANSFER IN A SIMULATED SPENT FUEL POOL - A COMPARISON BETWEEN ANSYS CFX AND OPENFOAM CODES

FERNANDO P. FARIA; JÉSSICA ACHILLES; GODINO M. DARIO; SANTIAGO F. CORZO; DAMIAN E. RAMAJO; F. CARDOSO; ANTONELLA L. COSTA; CLAUBIA PEREIRA

Santos, SP, Brasil

Congreso; International Nuclear Atlantic Conference - INAC 2019; 2019

ASSOCIACAO BRASILEIRA DE ENERGIA NUCLEAR - ABEN

This work presents thermal evaluation under wet storage conditions of spent fuels (SF) of the types UO2 and (Th,TRU)O2 discharged from Pressurized Water Reactor (PWR). The studies were performed in the absence of the external cooling system (ECS) of the pool (SFP), and the goal was to compare the water boiling time (Tb) of the pool with these types of SF stored either in a mixed arrange (UO2 together with (Th,TRU)O2) or only UO2. The modelled SFP were based on the real geometrical parameters of the pool of ANGRA II-Brazil. The SF are volumetric heat sources whose intensities are the decay heat values at time t=0 year after reactor discharge. The simulations were implemented in Ansys CFX and OpenFOAM© codes. Tb ranged from 4.8 h to 5.8 h for simulations using Ansys, and 4.2 h to 5.6 h using OpenFOAM©, depending on the kind of SF stored (mixed or only UO2) and the arrangement of SF into the SFP showing good agreement for both codes.