Verification of AP1000 (R) low-margin PRA sequences based on best-estimate calculations

Queral Salazar, José Cesar; Rivas Lewicky, Julio; Rebollo Mena, María José y Montero-mayorga, J. (2017). Verification of AP1000 (R) low-margin PRA sequences based on best-estimate calculations. "Annals of nuclear energy", v. 104 ; pp. 9-27. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2017.02.001.

Descripción

Título: Verification of AP1000 (R) low-margin PRA sequences based on best-estimate calculations
Autor/es:
  • Queral Salazar, José Cesar
  • Rivas Lewicky, Julio
  • Rebollo Mena, María José
  • Montero-mayorga, J.
Tipo de Documento: Artículo
Título de Revista/Publicación: Annals of nuclear energy
Fecha: 2017
Volumen: 104
Materias:
Palabras Clave Informales: AP1000; Expanded event trees; LOCA; Focused PRA; Passive safety systems; TRACE
Escuela: E.T.S.I. de Minas y Energía (UPM)
Departamento: Energía y Combustibles
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (813kB) | Vista Previa

Resumen

The Westinghouse AP1000 reactor is an advanced design whose safety systems are mainly passive safety systems. Due to the passive nature of the safety related systems and its dependency on small changes on certain variables (e.g. pressure, friction coefficients) together with the use of a simplified code like MAAP in Probabilistic Risk Assessment (PRA) analyses, it makes necessary to confirm that when core cooling is achieved, thermal-hydraulic (T/H) uncertainties are bounded. The T/H uncertainty evaluation process performed by Westinghouse Electric Company (WEC) identified the low-margin sequences (core uncovery) by expanding PRA Event Trees (ETs). The expanded ETs allowed finding the low-margin riskimportant sequences and then a set of low-margin bounding sequences was selected. Then detailed safety analysis methodologies were applied in order to evaluate the bounding sequences demonstrating that the T/H uncertainties were bounded. The Universidad Politécnica de Madrid group has verified the low-margin bounding sequences obtained by WEC with the best-estimate TRACE code in order to verify the previous results and also to study the phenomenology of such sequences through a best-estimate code. This paper presents the results obtained for short-term low-margin bounding sequences. In general, TRACE results do not present important discrepancies with respect to NOTRUMP and WCOBRA/TRAC results although TRACE presents lower values for Peak Cladding Temperature. This analysis has allowed to verify the AP1000 thermal-hydraulic bounding evaluation process performed by WEC for the lowmargin risk-important sequences with TRACE code.

Más información

ID de Registro: 50424
Identificador DC: http://oa.upm.es/50424/
Identificador OAI: oai:oa.upm.es:50424
Identificador DOI: 10.1016/j.anucene.2017.02.001
URL Oficial: https://www.sciencedirect.com/science/article/pii/S0306454916305151?via%3Dihub
Depositado por: Memoria Investigacion
Depositado el: 11 May 2018 09:09
Ultima Modificación: 11 May 2018 18:38
  • GEO_UP4
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • InvestigaM
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM