Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 16 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
Voltage detection apparatus and combination circuit
Potentiometric-sensor chip, potentiometric assay, and assay kit
Method and system for imaging a cross section of a specimen
Organic light emitting display apparatus
Method and assembly for determining the temperature of a test sensor
Adsorptive molded parts and the use thereof
Zero-copy network and file offload for web and application servers
  Randomly Featured Patents
Combination lock
Paper tray locking apparatus
Plumbing fixture
Radiator cap tool
Noncatalytic organic synthesis using supercritical water
Digital expander for generating multiple analog control signals particularly useful for controlling an oscillator
Safety pressure relief apparatus
Multiple output buck converter
Flying wing aircraft with canard
Passive solid state ionizing radiation sensor