Methods and systems for determining fatigue usage factors...

Details Methods and systems for determining fatigue usage factors... Methods and systems for determining fatigue usage factors...

2005-06-21

2005-06-21

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

C073S788000

Reexamination Certificate

active

06907791

ABSTRACT:
A method for calculating a fatigue usage factor of a component in a nuclear reactor includes determining a flow scaling factor for each stress component of a stress cycle, applying the flow scaling factor to rapid cycling stress conditions, and performing a fatique evaluation by calculating a fatigue usage factor using the flow scaling factor. The flow scaling factor is a ratio of a temperature fluctuation ratio at a first reactor operating condition divided by a temperature fluctuation ratio at a second reactor operating condition. The temperature fluctuation ratio is defined as a ratio of the metal temperature range over the fluid temperature range.

REFERENCES:
ASME Boiler and Pressure Vessel Code, The American Society of Mechanical Engineers, 1989, pp. 77, 79, 80, 81, FIG. I-9.2.1 and FIG. I-9.1.

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