Regular Article

Pumps modelling of a sodium fast reactor design and analysis of hydrodynamic behavior

Grupo MEDASEGI, Departamento de Ingeniería Química y Nuclear – Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain

^⁎ e-mail: joorro1@etsii.upv.es

Received: 4 May 2015
Received in final form: 15 May 2016
Accepted: 24 June 2016
Published online: 23 September 2016

Abstract

One of the goals of Generation IV reactors is to increase safety from those of previous generations. Different research platforms have been identified the need to improve the reliability of the simulation tools to ensure the capability of the plant to accommodate the design basis transients established in preliminary safety studies. The paper describes the modelling of primary pumps in advanced sodium cooled reactors using the TRACE code. Following the implementation of the models, the results obtained in the analysis of different design basis transients are compared with the simplifying approximations used in reference models. The paper shows the process to obtain a consistent pump model of the ESFR (European Sodium Fast Reactor) design and the analysis of loss of flow transients triggered by pumps coast–down analyzing the thermal hydraulic neutronic coupled system response. A sensitivity analysis of the system pressure drops effect and the other relevant parameters that influence the natural convection after the pumps coast–down is also included.