Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 10 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
Food-grade flour from dry fractionated corn germ and collet composition and method for producing same
Method for the analysis of solid objects
Method of producing probabilities of being a template shape
Compound containing a carbon or an oxygen isotope, preparation and use thereof, and composition comprising thereof
Module-code verification layer to automatically validate user input
Process to extract quassinoids
Light fixture
  Randomly Featured Patents
Closing spring assembly for slam-shut valves
Device for providing electrical continuity between electrically conductive surfaces
Ferroelectric ceramics
Kitchen down light
Method of making phase change memory device employing thermally insulating voids and sloped trench
Support for an article of furniture
Smoke detector
Shaving instrument
Plasma display device with electrically floated auxiliary electrodes
System for provisional radio frequency cardiac stimulation for replacement of the pacemaker