Original scientific paper
Identification of Limiting Case Between DBA and SBDBA (CL Break Area Sensitivity): A New Model for the Boron Injection System
R. Gonzales
; San Piero a Grado Nuclear Research Group (GRNSPG) University of Pisa Via Livornese 1291-56122 - San Piero a Grado – Pisa - ITALY
A. Petruzzi
; San Piero a Grado Nuclear Research Group (GRNSPG) University of Pisa Via Livornese 1291-56122 - San Piero a Grado – Pisa - ITALY
F. D’Auria
; San Piero a Grado Nuclear Research Group (GRNSPG) University of Pisa Via Livornese 1291-56122 - San Piero a Grado – Pisa - ITALY
O. Mazzantini
; Nucleo-electrica Argentina Sociedad Anonima (NA-SA) Buenos Aires, ARGENTINA
Abstract
Atucha-2 is a Siemens-designed PHWR reactor under construction in the Republic of
Argentina. Its geometrical complexity and (e.g., oblique Control Rods, Positive Void coefficient)
required a developed and validated complex three dimensional (3D) neutron kinetics (NK) coupled
thermal hydraulic (TH) model. Reactor shut-down is obtained by oblique CRs and, during
accidental conditions, by an emergency shut-down system (JDJ) injecting a highly concentrated
boron solution (boron clouds) in the moderator tank, the boron clouds reconstruction is obtained
using a CFD (CFX) code calculation. A complete LBLOCA calculation implies the application of
the RELAP5-3D© system code. Within the framework of the third Agreement “NA-SA –
University of Pisa” a new RELAP5-3D control system for the boron injection system was developed
and implemented in the validated coupled RELAP5-3D/NESTLE model of the Atucha 2 NPP. The
aim of this activity is to find out the limiting case (maximum break area size) for the Peak Cladding
Temperature for LOCAs under fixed boundary conditions.
Keywords
Hrčak ID:
199045
URI
Publication date:
31.7.2017.
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