STRATEGIES FOR THE INCREASING OF HIGH CYCLE FATIGUE (VIBRATION) PIPING FAILURES


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
Strategies to Mitigate Component Degradation

Authors:
A. Roukema (Structural Integrity Associates, Inc.)
  

Abstract

As the age of systems, structures, and components, (SCCs) in the nuclear industry increase, so does the level of effort and cost to manage their ageing. Many of the CANDU reactors in Canada are undergoing significant refurbishments and upgrades to turbines, pumps, and condensers, increasing the operating life and adding efficiency in an ever-challenging power generation market. Within the large engineering work packages for modifying these components, how often are vibration evaluations of affected small bore piping included? These small bore piping evaluations are being overlooked or improperly analyzed and the consequences, including loss of generation and increasing O&M; costs, are trending into the red.
This paper will provide a framework for evaluation methods based upon the risk of failure and guidance regarding empirical testing methods to evaluate vibration susceptibility before, during, and after a modification. A discussion will also be provided on coupling empirical testing with analytical techniques to further quantify the potential for high cycle fatigue damage.

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