Development and Design of the EPR™ Core Catcher

2010 ◽  
pp. 119-142
Author(s):  
Dietmar Bittermann ◽  
Manfred Fischer
Keyword(s):  
Core Catcher

scholarly journals Severe Accidents in Sodium-Cooled Fast Reactors: CFD Sensitivity Studies on the Thermal Ablation of Core-Catcher

2021 ◽  
Author(s):  
Olivier A. Czarny ◽  
Adrien Collin de l'Hortet ◽  
Nicolas Goreaud
Keyword(s):  
Thermal Ablation ◽  
Solid Material ◽  
Ablation Process ◽  
Fast Reactors ◽  
Severe Accidents ◽  
Core Catcher ◽  
Show Evidence ◽  
Internal Core ◽  
Sensitivity Studies

Abstract The present work aims at testing the CFD capabilities to simulate erosion of materials which interact with a corium mass. The main foreseen applications are the design of external/internal core catchers or in-vessel retentions devices used to mitigate severe accidents for Sodium-cooled Fast Reactors (SFR). 2D axisymmetric simulations of a corium jet impinging a sacrificial solid material show evidence of a pool-effect, previously observed in experiments, which contributes to limit the ablation process. Complementary sensitivities assess the influence of jet diameter, temperature and velocity.

Ablation of a Solid Material by High Temperature Liquid Jet Impingement: An Application to Corium Jet Impingement on a Sfr Core-Catcher

2021 ◽  
Author(s):  
Alexandre Lecoanet ◽  
Michel Gradeck ◽  
Xiaoyang Gaus-Liu ◽  
Thomas Cron ◽  
Beatrix Fluhrer ◽  
...  
Keyword(s):  
High Temperature ◽  
Deep Understanding ◽  
Jet Impingement ◽  
Severe Accident ◽  
Mitigation Measures ◽  
Liquid Jet ◽  
Cavity Formation ◽  
The Core ◽  
Core Catcher ◽  
Temperature Liquid

Abstract This paper deals with ablation of a solid by a high temperature liquid jet. This phenomenon is a key issue to maintain the vessel integrity during the course of a nuclear reactor severe accident with melting of the core. Depending on the course of such an accident, high temperature corium jets might impinge and ablate the vessel material leading to its potential failure. Since Fukushima Daiichi accident, new mitigation measures are under study. As a designed safety feature of a future European SFR, bearing the purpose of quickly draining of the corium out of the core and protecting the reactor vessel against the attack of molten melt, the in-core corium is relocated via discharge tubes to an in-vessel core-catcher has been planned. The core-catcher design to withstand corium jet impingement demands the knowledge of very complex phenomena such as the dynamics of cavity formation and associated heat transfers. Even studied in the past, no complete data are available concerning the variation of jet parameters and solid structure materials. For a deep understanding of this phenomenon, new tests have been performed using both simulant and prototypical jet and core catcher materials. Part of these tests have been done at University of Lorraine using hot liquid water impinging on transparent ice block allowing for the visualizations of the cavity formation. Other tests have been performed in Karlsruhe Institute of Technology using liquid steel impinging on steel block.

Numerical Investigation of Heat Transfer Characteristics of Debris Bed After Severe Accident of SFR Based on 1-D Heat Conduction Model

2018 ◽  
Author(s):  
Mengwei Zhang ◽  
Bin Zhang ◽  
Jianqiang Shan
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Transfer Process ◽  
Severe Accident ◽  
Heat Transfer Characteristics ◽  
Conduction Model ◽  
One Dimensional ◽  
The Core ◽  
Transfer Characteristics ◽  
Core Catcher

Nuclear reactor severe accidents can lead to the release of a large amount of radioactive material and cause immense disaster to the environment. Since the Fukushima nuclear accident in Japan, the severe accident research has drawn worldwide attention. Based on the one-dimensional heat conduction model, a DEBRIS-HT program for analyzing the heat transfer characteristics of a debris bed after a severe accident of a sodium-cooled fast reactor was developed. The basic idea of the DEBRIS-HT program is to simplify the complex energy transfer process in the debris bed to a simple one-dimensional heat transfer problem by solving the equivalent thermal conductivity in different situations. In this paper, the DEBRIS-HT program code is prepared by using the existing model and compared with the experimental results. The results show that the DEBRIS-HT program can correctly predict the heat transfer process in the fragment bed. In addition, the heat transfer characteristics analysis program is also used to model the core catcher of the China fast reactor. Firstly, the dryout heat flux when all of molten core dropped on the core catcher was calculated, which was compared with the result of Lipinski’s zero dimensional model, and the error between two values is only 11.2%. Then, the temperature distribution was calculated with the heat power of 15MW.

A multi layer core catcher concept for future sodium cooled fast reactors

2014 ◽  
Vol 65 ◽  
pp. 253-261 ◽  
Author(s):  
A. Jasmin Sudha ◽  
K. Velusamy ◽  
P. Chellapandi
Keyword(s):  
Fast Reactors ◽  
Core Catcher

Criticality safety analysis for a core catcher designed in Korea

2012 ◽  
Vol 59 ◽  
pp. 66-74 ◽  
Author(s):  
Song Hyun Kim ◽  
Chang Ho Shin ◽  
Hong-Chul Kim ◽  
Jong Kyung Kim ◽  
Jin Ho Song ◽  
...  
Keyword(s):  
Safety Analysis ◽  
Core Catcher ◽  
Criticality Safety

The “sphincter” corer: A wide-diameter corer with watertight core-catcher

1966 ◽  
Vol 4 (2) ◽  
pp. 149-162 ◽  
Author(s):  
A. Kermabon ◽  
P. Blavier ◽  
V. Cortis ◽  
H. Delauze
Keyword(s):  
Wide Diameter ◽  
Core Catcher
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