Feynman-Parameter Approach toN-Tower Exchange inφ3Theory

Abstract The problem of hydrogen behavior in containment buildings of nuclear reactors belongs to thermal-hydraulic area. Taking into account the size of systems under consideration and, first of all, safety issues, such type of analyses cannot be done by means of full-scale experiments. Therefore, mathematical modeling and numerical simulations are widely used for these purposes. A lumped parameter approach based code HEPCAL has been elaborated in the Institute of Thermal Technology of the Silesian University of Technology for simulations of pressurized water reactor containment transient response. The VVER-440/213 and European pressurised water reactor (EPR) reactors containments are the subjects of analysis within the framework of this paper. Simulations have been realized for the loss-of-coolant accident scenarios with emergency core cooling system failure. These scenarios include core overheating and hydrogen generation. Passive autocatalytic recombiners installed for removal of hydrogen has been taken into account. The operational efficiency of the hydrogen removal system has been evaluated by comparing with an actual hydrogen concentration and flammability limit. This limit has been determined for the three-component mixture of air, steam and hydrogen. Some problems related to the lumped parameter approach application have been also identified.

Download Full-text

Distributed parameter approach to pulse response analysis of n:1 balun transformers

IEEE Transactions on Components Hybrids and Manufacturing Technology ◽

10.1109/33.19028 ◽

1989 ◽

Vol 12 (1) ◽

pp. 138-143 ◽

Cited By ~ 1

Author(s):

N. Nishizuka ◽

M. Nakatsuyama ◽

H. Nagahashi

Keyword(s):

Pulse Response ◽

Distributed Parameter ◽

Response Analysis ◽

Parameter Approach

Download Full-text

A new expanded solubility parameter approach

International Journal of Pharmaceutics ◽

10.1016/j.ijpharm.2012.01.001 ◽

2012 ◽

Vol 426 (1-2) ◽

pp. 29-43 ◽

Cited By ~ 53

Author(s):

Emmanuel Stefanis ◽

Costas Panayiotou

Keyword(s):

Solubility Parameter ◽

Parameter Approach

Download Full-text

A Stress Singularity Parameter Approach for Evaluating the Interfacial Reliability of Plastic Encapsulated LSI Devices

Journal of Electronic Packaging ◽

10.1115/1.3226542 ◽

1989 ◽

Vol 111 (4) ◽

pp. 243-248 ◽

Cited By ~ 82

Author(s):

T. Hattori ◽

S. Sakata ◽

G. Murakami

Keyword(s):

Adhesive Strength ◽

Evaluation Method ◽

Stress Singularity ◽

The Finite Element Method ◽

Displacement Fields ◽

Stress And Displacement Fields ◽

Ni Alloy ◽

Base Resin ◽

Interfacial Reliability ◽

Parameter Approach

Since the stress and displacement fields near a bonding edge show singularity behaviors, the adhesive strength evaluation method, using maximum stresses calculated by a numerical stress analysis such as the finite element method, is generally not valid. In this paper, a new method, which uses two stress singularity parameters, is presented for evaluating adhesive strength. This method is applied to several kinds of molded models, composed of epoxy base resin and Fe-Ni alloy sheets, and plastic encapsulated LSI models. Predictions about the initiation and extension of delamination are compared with the results of observations made by scanning acoustic tomography on these models.

Download Full-text