Water boiling time in a spent fuel pool with adiabatic and non- adiabatic boundary conditions

FERNANDO PEREIRA DE FARIA; DARIO MARTIN GODINO; SANTIAGO FRANCISCO CORZO; DAMIAN ENRIQUE RAMAJO; ANTONELLA LOMBARDI COSTA; CLAUBIA PEREIRA

Brazilian Journal of Development

Brazilian Journal of Development - ISSN 2525-8761

Lugar: Curitiba; Año: 2022 vol. 8 p. 6116 - 61125

2525-8761

The Spent Fuel Pool (SFP) of Angra II, from Brazil, has received standard spent fuel (SF) assemblies of Uranium dioxide (UO2) discharged from Pressurized Water Reactors (PWR) of the Nuclear Power Plants (NPP) of Angra since the beginning of its operation. However, in case of using Mixed Oxide (MOX) or Thorium-based fuels, it would require further thermal studies of wet storage. It includes the determination of the water boiling time (Tb) of the SFP in case of breakdown of its external cooling system (ECS). This work presents studies of Tb of a simulated SFP storing mixed SF discharged from PWRs. The types of mixed SF studied include MOX plus UO2, oxide of thorium/uranium (U-Th)O2 plus UO2, and oxide of Thorium/transuranic (TRU-Th)O2 plus UO2. The simulations were implemented in CFX Ansys considering the top of the SFP as either adiabatic or non-adiabatic wall. Tb is considerably higher when the non-adiabatic boundary condition is used.