Analysis of Inertization Strategies for the Filtered Containment Venting System in Cofrentes Nuclear Power Plant

Author:

Fernández-Cosials Kevin1,Jiménez Gonzalo1,Serrano César2,Ibáñez Luisa3,Peinado Ángel2

Affiliation:

1. Energy Engineering Department, Universidad Politécnica de Madrid, Madrid 28006, Spain e-mail:

2. Iberdrola Generación Nuclear, Madrid 28050, Spain

3. CT3, Madrid 28050, Spain

Abstract

During a severe accident (SA) in a nuclear power plant (NPP), there are several challenges that need to be faced. To coup with a containment overpressure, the venting action will lower the pressure but it will release radioactivity to the environment. In order to reduce the radioactivity released, a filtered containment venting system (FCVS) can be used to retain iodine and aerosols radioactive releases coming from the containment atmosphere. However, during a SA, large quantities of hydrogen can also be generated. Hydrogen reacts violently with oxygen and its combustion could impair systems, components, or structures. For this reason, to protect the integrity of the FCVS against hydrogen explosions, an inertization system is found necessary. This system should create an inert atmosphere previous to any containment venting that impedes the contact of hydrogen and oxygen. In this paper, the inertization system for Cofrentes NPP is presented. It consists of a nitrogen injection located in three different points. A computational model of the FCVS as well as the inertization system has been created. The results show that if the nitrogen sweeps and the containment venting are properly synchronized, the hydrogen risk could be reduced to a minimum and therefore, the integrity of the FCVS would be preserved.

Publisher

ASME International

Subject

Nuclear Energy and Engineering,Radiation

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