Analysis of primary bleed and feed strategies for selected SBLOCA sequences in a German Konvoi PWR using ASTEC V2.0

Queral Salazar, José Cesar and Gómez-García-Torano, Ignacio and Sánchez-Espinoza, Víctor Hugo and Stieglitz, Robert (2017). Analysis of primary bleed and feed strategies for selected SBLOCA sequences in a German Konvoi PWR using ASTEC V2.0. "Annals of Nuclear Energy", v. 110 ; pp. 818-832. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2017.08.003.

Description

Title: Analysis of primary bleed and feed strategies for selected SBLOCA sequences in a German Konvoi PWR using ASTEC V2.0
Author/s:
  • Queral Salazar, José Cesar
  • Gómez-García-Torano, Ignacio
  • Sánchez-Espinoza, Víctor Hugo
  • Stieglitz, Robert
Item Type: Article
Título de Revista/Publicación: Annals of Nuclear Energy
Date: 2017
ISSN: 0306-4549
Volume: 110
Subjects:
Freetext Keywords: ASTEC; German Konvoi PWR; Small break LOCA; Station blackout; Severe accident management; Primary bleed and feed
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Energía y Combustibles
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The severe accidents at Fukushima have shown that a further development of Severe Accident Management Guidelines (SAMGs) is necessary. Within this work, the severe accident code ASTEC V2.0 is used to assess the impact of selected SAM measures on the in-vessel progression of Small Break (SBLOCA) scenarios in a generic German Konvoi PWR. The progression of reference SBLOCA sequences with and without Station Blackout (SBO) is firstly analyzed. Calculations show that melting and vessel failure can be delayed if the secondary side is filled before the plant is struck by the SBO. Based on these results, a systematic evaluation of primary side depressurization and core reflooding as primary SAM measures is carried out. Simulations yield the following results: • Primary Side Depressurization must be initiated before the Core Exit Temperature (CET) > 400 C or, if not possible, with a maximum delay of 20 min to delay core melting and vessel failure. • Core reflooding must be launched immediately after CET > 650 C with at least 7.50–20 kg/s in order to mitigate the accident without major core damage. • If an external injection is used for such aim, the deployment order of a medium-high pressure head (>20 bars) mobile pump must be issued 1 h after the entrance in SBO. • Vessel failure cannot be prevented if more than 20 corium tons are present in the lower plenum for more than 1 h regardless of the injection rate. The performed investigations clarify ASTEC V2.0 capabilities to describe the in-vessel progression of a severe accident in PWRs and contribute to extend the technical basis for the further improvement of SAMGs in German Konvoi PWR.

More information

Item ID: 50425
DC Identifier: http://oa.upm.es/50425/
OAI Identifier: oai:oa.upm.es:50425
DOI: 10.1016/j.anucene.2017.08.003
Official URL: https://www.sciencedirect.com/science/article/pii/S0306454917302256?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 26 Apr 2018 10:06
Last Modified: 26 Mar 2019 09:37
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