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

[+] Author and Article Information
Kevin Fernández-Cosials

Energy Engineering Department,
Universidad Politécnica de Madrid,
Madrid 28006, Spain
e-mail: kevin.fcosials@upm.es

Gonzalo Jiménez

Energy Engineering Department,
Universidad Politécnica de Madrid,
Madrid 28006, Spain
e-mail: gonzalo.jimenez@upm.es

César Serrano, Ángel Peinado

Iberdrola Generación Nuclear,
Madrid 28050, Spain

Luisa Ibáñez

CT3,
Madrid 28050, Spain

Manuscript received July 4, 2017; final manuscript received November 20, 2017; published online May 16, 2018. Assoc. Editor: Masaki Morishita.

ASME J of Nuclear Rad Sci 4(3), 031016 (May 16, 2018) (13 pages) Paper No: NERS-17-1065; doi: 10.1115/1.4038595 History: Received July 04, 2017; Revised November 20, 2017

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.

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Figures

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Fig. 7

Code-to-code comparison of gothic and VALCON results on an opening of the IV

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Fig. 4

Filtered containment venting system schematic layout

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Fig. 3

Filter system components 3D layout

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Fig. 2

Hard venting system 3D layout

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Fig. 1

Hard venting system of Cofrentes NPP

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Fig. 5

Mesh of the FS gothic model

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Fig. 6

Mesh of the HVS gothic model

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Fig. 8

Gas volume fractions of the different species of the containment atmosphere during the transient

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Fig. 15

Filtered containment venting system state before and right after the third and subsequent inertization

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Fig. 13

Filtered containment venting system state before and right after the inertization prior to the BV close

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Fig. 14

Filtered containment venting system state before and right after the second inertization

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Fig. 9

Room separation for hydrogen risk analysis

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Fig. 10

Average oxygen volume fraction in different zones during the first venting

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Fig. 11

Average hydrogen volume fractions in different zones during the venting without the FS inerted

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Fig. 12

Average hydrogen volume fraction in different zones during the first venting

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Fig. 16

Oxygen volume fraction in different locations during the first nitrogen sweep

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Fig. 17

Oxygen volume fraction in different locations during the second nitrogen sweep

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Fig. 18

Oxygen and hydrogen average gas volume fraction in different zones during the third nitrogen sweep

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