Some Nuclear Reactor Safety Related Aspects of Plunging Jets

2010 ◽  
Author(s):  
Eckhard Krepper ◽  
Frank-Peter Weiss ◽  
So¨ren Alt ◽  
Alexander Kratzsch ◽  
Stefan Renger ◽  
...  
Keyword(s):  
Nuclear Reactor ◽  
Reactor Safety ◽  
Joint Research ◽  
Cfd Models ◽  
Safety Research ◽  
Joint Research Project ◽  
Plunging Jets ◽  
Nuclear Reactor Safety ◽  
Entrained Air ◽  
The University

Plunging jets play an important role in nuclear reactor safety research. In the present paper the case of the strainer clogging issue is considered. Entrained air caused by a plunging jet has an influence of the liquid flow field and on the fibre transport in the sump. In the paper the amount of entrained air is given as an inlet boundary condition according to correlations in the literature and confirmed by own experiments. The influence of entrained air on the fibre deposition pattern at the bottom of a tank and on the mixing procedure for the case of temperature differences between jet and tank water are investigated by CFD calculations and compared to experiments. The presented work is part of a joint research project performed in cooperation between the University of Applied Science Zittau/Go¨rlitz and Forschungszentrum Dresden-Rossendorf. The project deals with the experimental investigation of particle transport phenomena in coolant flow in Zittau and the development of CFD models for its simulation in Rossendorf (Krepper et al. 2008).

Experimental Investigation and CFD Simulation of the Behaviour of Mineral Wool in the Reactor Sump

2008 ◽  
Author(s):  
Eckhard Krepper ◽  
Gregory Cartland-Glover ◽  
Alexander Grahn ◽  
Frank-Peter Weiss ◽  
So¨ren Alt ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Cfd Simulation ◽  
Mineral Wool ◽  
Cfd Modeling ◽  
Joint Research ◽  
Cooling Systems ◽  
Safety Research ◽  
Joint Research Project ◽  
Core Cooling ◽  
The University

The investigation of insulation debris generation, transport and sedimentation becomes important with regard to reactor safety research for PWR and BWR, when considering the long-term behavior of emergency core cooling systems during all types of loss of coolant accidents (LOCA). The insulation debris released near the break during a LOCA incident consists of a mixture of disparate particle population that varies with size, shape, consistency and other properties. Some fractions of the released insulation debris can be transported into the reactor sump, where it may perturb/impinge on the emergency core cooling systems. Open questions of generic interest are the sedimentation of the insulation debris in a water pool, its possible re-suspension and transport in the sump water flow and the particle load on strainers and corresponding pressure drop. A joint research project on such questions is being performed in cooperation between the University of Applied Sciences Zittau/Go¨rlitz and the Forschungszentrum Dresden-Rossendorf. The project deals with the experimental investigation of particle transport phenomena in coolant flow and the development of CFD models for its description. While the experiments are performed at the University at Zittau/Go¨rlitz, the theoretical modeling efforts are concentrated at Forschungszentrum Dresden-Rossendorf. In the current paper the basic concepts for CFD modeling are described and feasibility studies including the conceptual design of the experiments are presented.

scholarly journals Application of CFD Codes in Nuclear Reactor Safety Analysis

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
T. Höhne ◽  
E. Krepper ◽  
U. Rohde
Keyword(s):  
Nuclear Reactor ◽  
Structural Integrity ◽  
Safety Analysis ◽  
Insulation Material ◽  
Reactor Safety ◽  
Two Phase ◽  
Rod Bundle ◽  
Water Reactors ◽  
Nuclear Reactor Safety ◽  
The University

Computational Fluid Dynamics (CFD) is increasingly being used in nuclear reactor safety (NRS) analyses as a tool that enables safety relevant phenomena occurring in the reactor coolant system to be described in more detail. Numerical investigations on single phase coolant mixing in Pressurised Water Reactors (PWR) have been performed at the FZD for almost a decade. The work is aimed at describing the mixing phenomena relevant for both safety analysis, particularly in steam line break and boron dilution scenarios, and mixing phenomena of interest for economical operation and the structural integrity. For the experimental investigation of horizontal two phase flows, different non pressurized channels and the TOPFLOW Hot Leg model in a pressure chamber was build and simulated with ANSYS CFX. In a common project between the University of Applied Sciences Zittau/Görlitz and FZD the behaviour of insulation material released by a LOCA released into the containment and might compromise the long term emergency cooling systems is investigated. Moreover, the actual capability of CFD is shown to contribute to fuel rod bundle design with a good CHF performance.

scholarly journals Nuclear reactor safety: Super-Sara's fate undecided

Nature ◽  
1982 ◽  
Vol 300 (5894) ◽  
pp. 677-677
Author(s):  
Jasper Becker
Keyword(s):  
Nuclear Reactor ◽  
Reactor Safety ◽  
Nuclear Reactor Safety

International Collaborations as Research Infrastructure

2017 ◽  
Author(s):  
P.K. Viswanathan ◽  
R. Parthasarathy ◽  
Madhusudan Bandi
Keyword(s):  
International Collaboration ◽  
Social Science Research ◽  
Science Research ◽  
Cultural Exchange ◽  
State Universities ◽  
Joint Research ◽  
Exchange Program ◽  
Joint Research Project ◽  
International Collaborations ◽  
The University

This chapter examined the availability of the facilities for international collaboration for research, with a focus on two prime organisations, the University Grant Commission (UGC) and the Indian Council of Social Science Research (ICSSR), which are engaged in promoting international collaboration. Beside this data also collected from various central and state universities. The study found that UGC has cultural exchange program with 48 countries, which include joint research project, exchanges of faculty, fellowship such as post-doctoral project-based exchange, and exchange of scholar programmes with several countries.

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