Double-Ended LBLOCA Containment Analysis in Trillo NPP with GOTHIC 8.1

Fernández Cosials, Kevin and Jiménez Varas, Gonzalo and Estévez Albuja, Samanta Estefanía and Bocanegra Melián, Rafael and Barreira Pereira, Pilar and Rey Peinado, Luis and Posada Barral, Jose María and Martínez-Murillo Méndez, Juan Carlos (2016). Double-Ended LBLOCA Containment Analysis in Trillo NPP with GOTHIC 8.1. In: "42ª Reunión Anual de la Sociedad Nuclear Española", 28-30 septiembre 2016, Santander (España). pp. 1-6.

Description

Title: Double-Ended LBLOCA Containment Analysis in Trillo NPP with GOTHIC 8.1
Author/s:
  • Fernández Cosials, Kevin
  • Jiménez Varas, Gonzalo
  • Estévez Albuja, Samanta Estefanía
  • Bocanegra Melián, Rafael
  • Barreira Pereira, Pilar
  • Rey Peinado, Luis
  • Posada Barral, Jose María
  • Martínez-Murillo Méndez, Juan Carlos
Item Type: Presentation at Congress or Conference (Article)
Event Title: 42ª Reunión Anual de la Sociedad Nuclear Española
Event Dates: 28-30 septiembre 2016
Event Location: Santander (España)
Title of Book: Ponencias de la 42ª Reunión Anual de la Sociedad Nuclear Española
Date: September 2016
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Energética
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The radioactive material confinement in a nuclear power plant (NPP), , is a fundamental safety function to be ensured during a design basis accident (DBA). For plant licensing analysis, the containment is usually modeled with a lumped parameter approach. The assumption that within each region the fluid is well mixed is inherent to this approach. However, the containment is a large building with a complex configuration. It is distributed in several compartments that avoid the well mixing of the fluid and that provoke three-dimensional effects that affect the thermal–hydraulic behavior. Reactors like Trillo NPP are highly compartmentalized in order to reduce the dose to the personnel, in contrast with PWR-W reactors that present a more diaphanous layout. Accordingly, this kind of reactors are more liable to have three dimensional effects and/or local differences than a PWR-W. The collaborative project between the UPM and CNAT has enabled the development of highly detailed three-dimensional models of the Trillo NPP containment building. The objective of this study is the detailed 3D thermal-hydraulic analysis during a mass and energy release where local effects can be observed. Most of DBA analysis are performed using lumped-parameters models which only allow to know the average containment state, and that has several assumptions related with 0D models. For this reason a generic double-ended LBLOCA is simulated in a GOTHIC 3D model in order to study the local phenomenology occurring during this kind of transient. Analyzing the results, an homogeneous pressurization over the whole containment can be observed, with the exception of the rooms near the break. This is predictable given that pressure is transmitted at the speed of sound. However, temperature evolution is different between compartments. Temperature behavior obeys to convective-diffusive processes, and it presents strong differences between compartments that cannot be seen with lumped parameters models. The steam residence time becomes one of the critical parameters in the containment thermal behavior, and this is strongly dependent on the building geometry.

More information

Item ID: 47624
DC Identifier: http://oa.upm.es/47624/
OAI Identifier: oai:oa.upm.es:47624
Official URL: https://www.inscripcioneventos.com/563410/docs/563410-12285.pdf
Deposited by: Memoria Investigacion
Deposited on: 01 Sep 2017 07:14
Last Modified: 05 Sep 2017 10:52
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