Development of a PWR-W GOTHIC 3D model for containment accident analysis

Bocanegra, Rafael; Varas, Gonzalo Jiménez; Fernández-Cosials, Mikel Kevin

doi:10.1016/j.anucene.2015.10.022

Cited by 25 publications

(17 citation statements)

References 9 publications

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“…To decide which tools are more appropriate for this task, the technical reports from the OECD/NEA have provided an exhaustive overview on the main simulation tools for hydrogen risk problems (NEA, 1999(NEA, , 2015. The use of 3D containment codes has been widely extended for detailed containment mass and energy release simulations throughout the last years (Chen et al, 2011(Chen et al, , 2012Papini et al, 2011;Jimenez et al, 2015;Ozdemir et al, 2015a;Bocanegra et al, 2016;Xiao et al, 2016). In the named NEA reports, the use of a suite of tools such as a combination of a lumped parameter code, like MELCOR or MAAP, with a 3D containment code, like GOTHIC or GASFLOW, is highly recommended for hydro gen risk mitigation analysis.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen distribution and Passive Autocatalytic Recombiner (PAR) mitigation in a PWR-KWU containment type

López-Alonso

Papini

Varas

2017

Annals of Nuclear Energy

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The evaluation of Passive Autocatalytic Recombiners (PARs) performance has been foreseen from the EU stress tests in the frarnework of a complementary and comprehensive review of the safety of the Nuclear Power Plants (NPPs).The study presented in this work analyses the size,location and number of the PARs to minimise the risk arising from a hydrogen release and its distribution in the containment building dur ing a hypothetical severe accident A detailed 30 rnodel of a PWR KWU containment type was used for the simulations.The numerical tool is the GOTHIC 8.1 containrnent code, which can model certain aspects of the system geometry and beha viour in more detail than typically considered in containment performance analysis.The severe accident scenario chosen is a fast release of hydrogen steam mixture from hot leg creep rupture during SBO (Station Black Out) accident. In the first place, the hydrogen preferential pathways and points of hydrogen accumulation were studied and identified starting from the base case scenario without any mitigation measure. Secondly, a con figuration of PARs was simulated under the same conditions ofthe unmitigated case.The number of PARs considered is 40 units distributed all over the containrnent building. The PAR configuration offered an improvement in the chosen accidental scenario, decreasing the pos sibility of hydrogen combustion in all the containment compartrnents at the end of the transient The analyses showed that this PAR configuration could lead toa reduction between 30 45% of the final hydro gen concentration.The hydrogen combustion risk is decreased with final hydrogen concentration values below the flamrnability limit (hydrogen concentration below 7%). Nonetheless, the analysis showed the inability of the PARs to recombine in the early stage of the fast release (the first 1 2min in this sequence), due to their inertia and occurrence of oxygen starvation conditions.

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Section: Introductionmentioning

confidence: 99%

Hydrogen distribution and Passive Autocatalytic Recombiner (PAR) mitigation in a PWR-KWU containment type

López-Alonso

Papini

Varas

2017

Annals of Nuclear Energy

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“…This analysis is made in order to confirm that the solutions are monotonic at some point of mesh refinement, even though there are several phenomena involved. The model used is the multi-zone model described in [146,147]. This is a PWR-W containment with a M&E release.…”

Section: Mesh Sensitivity To a M And E Release In A Full Containmentmentioning

confidence: 99%

“…This detailed information will be given because the simple creation of the model is a step forward in the state of the art of containment 3D models with the GOTHIC code. This section is adapted from the Thesis author's publications, [146], [147] , [160] and [161].…”

Section: Hydrogen Flammability Limitsmentioning

confidence: 99%

“…The boundary conditions are located near the pumps of the correspondent loop. The variables shown are averaged in volume and porosity for each containment room, using an upgraded version of ProTON, [146]. This version of ProTON calculates the averaged values for pressure, temperature or species concentration for each room as well as the Tau parameter (hydrogen risk).…”

Section: Reference Sbo Gothic Simulationmentioning

confidence: 99%

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Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

Fernández-Cosials¹

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“…Other hydrogen mitigation systems for SA can be PAR system and containment venting system besides the high dry containment capacity of this type of NPPs. (Bocanegra et al, 2016). For long terms sequences such as the ones simulated in this PhD, an integrated model would need higher computer resources, so for the sensitivity analyses that are needed to do the used of this multi-zone model is highly recommended.…”

Section: Station Blackout (Sbo)mentioning

confidence: 99%

A proposed methodology for passive autocatalytic recombiners sizing and location in LWR containments

Conty¹,

Sara²

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Development of a PWR-W GOTHIC 3D model for containment accident analysis

Cited by 25 publications

References 9 publications

Hydrogen distribution and Passive Autocatalytic Recombiner (PAR) mitigation in a PWR-KWU containment type

Hydrogen distribution and Passive Autocatalytic Recombiner (PAR) mitigation in a PWR-KWU containment type

Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

A proposed methodology for passive autocatalytic recombiners sizing and location in LWR containments

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