Ultrasonic evaluation of radiation embrittlement in reactor vessel materials

2001 ◽  
Author(s):  
SamLai Lee
Keyword(s):  
Reactor Vessel ◽  
Radiation Embrittlement ◽  
Ultrasonic Evaluation

Radiation Embrittlement of PWR Reactor Vessel Weld Metals : Nickel and Copper Synergism Effects

2009 ◽  
pp. 392-392-20 ◽  
Author(s):  
C Guionnet ◽  
B Houssin ◽  
D Brasseur ◽  
A Lefort ◽  
D Gros ◽  
...  
Keyword(s):  
Reactor Vessel ◽  
Radiation Embrittlement ◽  
Weld Metals

Radiation Embrittlement Mechanistic Modelling

1993 ◽  
Vol 46 (5) ◽  
pp. 162-170
Author(s):  
W. A. Pavinich ◽  
W. L. Server ◽  
T. J. Griesbach
Keyword(s):  
Heat Treatment ◽  
Thermal Annealing ◽  
Temperature Effects ◽  
Reactor Vessel ◽  
Post Weld Heat Treatment ◽  
Mechanistic Models ◽  
Radiation Embrittlement ◽  
Initial Direction ◽  
Predictive Equations ◽  
Mechanistic Modelling

The mechanistic models of radiation embrittlement for reactor vessel steels are reviewed and direction for improving these models is provided. Improvement in these mechanistic models will lead to predictive expressions for parameters of engineering interest. This paper provides the initial direction of modelling efforts that will improve existing or develop new predictive equations for damage attenuation, temperature effects, thermal annealing, the effect of post weld heat treatment, transition behavior and upper shelf behavior of reactor vessel steels.

Ultrasonic Evaluation of "Silent Regions" in the Thyroid Scintiscan

1978 ◽  
Vol 17 (01) ◽  
pp. 16-23 ◽  
Author(s):  
Ch. L. Zollikofer ◽  
J. Wewerka ◽  
Th. Frank
Keyword(s):  
Needle Biopsy ◽  
Clinical Course ◽  
Stimulation Test ◽  
Evaluation Procedure ◽  
Sonographic Diagnosis ◽  
Non Invasive ◽  
Evaluation Procedures ◽  
Ultrasonic Evaluation ◽  
Invasive Evaluation ◽  
Autonomous Adenoma

35 patients with scintigraphically silent thyroid regions without palpable cold nodules were further evaluated by ultrasonography. In 33 cases the sonographic diagnosis was confirmed by other examinations or the clinical course. 2 cases were misinterpreted right at the beginning of our series.The use of ultrasonography in evaluating silent thyroid regions in the totally decompensated autonomous adenoma, in unilateral thyroid aplasia, thyroiditis and hyperthyroidism is shown to be a reliable and valuable supplement to the clinical and radioisotopic evaluation procedures. When differentiating the totally decompensated autonomous adenoma from unilateral thyroid aplasia a stimulation test need not be performed in most cases. Suspected thyroiditis can be confirmed in a simple way. Being a non-invasive evaluation procedure, ultrasonography should be used before performing a needle biopsy.

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