Analysis of inertization strategies for the filtered containment venting system in Cofrentes NPP

[+] Author and Article Information
Kevin Fernández-Cosials

Universidad Politécnica de Madrid

Gonzalo Jimenez

Universidad Politécnica de Madrid

César Serrano

Iberdrola Generación Nuclear

Luisa Ibanez


Ángel Peinado

Iberdrola Generación Nuclear

1Corresponding author.

ASME doi:10.1115/1.4038595 History: Received July 04, 2017; Revised November 20, 2017


During a severe accident in a nuclear power plant, 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 can be used to retain iodine and aerosols radioactive releases coming from the containment atmosphere. However, during a severe accident, 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 filtered containment venting system 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 nuclear power plant is presented. It consists of a nitrogen injection located in three different points. A computational model of the filtered containment venting system 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 filtered containment venting system would be preserved.

Copyright (c) 2017 by ASME
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