Fracture mechanics safety assessment based on mechanics of materials

1990 ◽  
Vol 61 (4) ◽  
pp. 172-180 ◽  
Author(s):  
Eberhard Roos ◽  
Thomas Demler ◽  
Ulrich Eisele ◽  
Rainer Gillot
Keyword(s):  
Fracture Mechanics ◽  
Safety Assessment ◽  
Mechanics Of Materials

Probabilistic Distribution of Parameters Applied to PFM Analysis for Piping in China Experimental Fast Reactor

2013 ◽  
Author(s):  
Min Qi ◽  
Yueying Wang ◽  
Jia Liu
Keyword(s):  
Fracture Mechanics ◽  
Fast Reactor ◽  
Safety Assessment ◽  
Small Sample Size ◽  
Research Work ◽  
Assessment Method ◽  
Small Sample ◽  
Probabilistic Distribution ◽  
Structure Dimension ◽  
China Experimental Fast Reactor

The safety assessment method based on probabilistic fracture mechanics (PFM) is well applied to pressure vessel and piping. The PFM analysis is more reasonable and reliable than determinate fracture mechanics (DFM) method. In PFM analysis, the uncertainty of main assessment parameters, such as loads, material character parameters, structure dimension and defect sizes are considered to be random, and the probabilistic distribution of these parameters are determined with the theory of probability statistics. Related to the practical engineering of China experimental fast reactor (CEFR), this paper has done some research work on the parameters probabilistic distribution, and a method was given to determine the optimum fitting probabilistic distribution function of parameters applied to PFM analysis for piping in the small sample size. The work of this paper makes the foundation of the further probabilistic safety assessment of CEFR piping.

Safety Assessment of Disposal Container for Higher Activity Low Level Waste

2010 ◽  
Author(s):  
Motonori Nakagami ◽  
Seiji Komatsuki ◽  
Kyosuke Fujisawa ◽  
Takashi Nishio ◽  
Thomas Quercetti ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Nuclear Power ◽  
Safety Assessment ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Fracture Strain ◽  
The Body ◽  
Unstable Fracture ◽  
Maximum Weight ◽  
Drop Tests

As one of the studies on “yoyushindo disposal” whose concept is similar to an intermediate disposal, the development of a disposal container has been conducted by the Federation of Electric Power Companies of Japan. To assess a drop event of a waste package in which stored the radioactive wastes from nuclear power plants, the toughness of the disposal container was evaluated by drop tests using three specimens which have actual dimensions, drop analysis, fracture mechanics assessment and macroscopic tests. The three specimens for drop tests were manufactured in consideration of the design specifications and the manufacture operations in nuclear power plants. The lid plates of the specimens were welded to the body plates without pre- and post-weld heat treatment by using a remote automated welding machine. The drop tests showed that no penetration cracks or splash of its content occurred in the disposal container under conservative conditions such as the maximum weight and height in the handling. Drop analysis and the fracture mechanics assessment indicate that the strain induced by the drop impact did not exceed the fracture strain and an unstable fracture did not occur. And macroscopic tests showed that penetration cracks did not occur at 8m drop events. These tests and evaluations confirmed that the disposal container had sufficient toughness.

Fracture mechanics of materials and strength of structures

2000 ◽  
Vol 36 (2) ◽  
pp. 309-311
Author(s):  
S. Kovchyk ◽  
H. Nykyforchyn ◽  
M. Savruk ◽  
S. Yarema
Keyword(s):  
Fracture Mechanics ◽  
Mechanics Of Materials
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