Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 15 for United States Patent #4908775.

The present invention is a cycle monitoring system and method that acquires, logs and analyzes analog and/or digital signals from component sensors in a process control plant such as a nuclear power plant. The system continuously monitors the sensors and records steady-state and transient phenomena. Compression of the data is performed to reduce storage load. The compression ratio for transient data is driven by a threshold indicating a measurement signficant to stress determination. Transient data is retained at a higher sampling rate, so that the parameters of transient such as the maximum value can be determined for stress analysis. The stress analysis determines pressure and thermal stresses which are used to calculate a usage factor which indicates the stress age and thus the remaining life of a component. The system provides estimates of fatigue accumulation associated with selected locations of critical power plant components. Measurements of plant process and response parameters are used to provide data for calculation of fatigue accumulation. The system includes a computer containing a database that includes thresholds and response characteristics of the plant components to varying types of stress. The process required to calculate fatigue for monitored components and locations uses Duhamels integral to calculate transient stress, combines the transient stress with other stresses to produce a usage factor from stress ranges designating when a stress cycle has occurred. The system can be used to plan routine maintenance, repair and replacement decision, and to justify alternative plant operation modes and life extension.

  Recently Added Patents
Automatic actuator for breakers or switches
Communication terminal device, and recording medium
Hydroxyl-terminated thiocarbonate containing compounds, polymers, and copolymers, and polyurethanes and urethane acrylics made therefrom
Stable file system
Fuel cell module
Generating compiled code that indicates register liveness
Apparatus and method for layered decoding in a communication system using low-density parity-check codes
  Randomly Featured Patents
System and method for sidelobe reduction using detect-and-subtract techniques
Electrical connector with terminal and connector position assurance devices
Apparatus and apparatus for mixing and cooling molding sand
Use of paroxetine for the treatment of senile dementia, bulimia, migraine or anorexia
Method for analyzing a diffusing sample by time resolution measurement
Locking devices
Process for improving the physical and catalytic properties of fluid cracking catalysts
Mother mold-forming silicone rubber composition and mother mold
Method and apparatus for preventing image artifacts
Method of filtering optical signals with a capillary waveguide tunable optical device