Community Research and Development Information Service - CORDIS


Thermal Fatigue Evaluation of Piping System T Connections (THERFAT), EUR 23096

Project ID: FIKS-CT-2001-00158
Funded under: FP5-EAECTP C


Thermal fatigue is one significant long-term degradation mechanism in nuclear power plants (NPPs), in particular as operating plants become older and lifetime extension activities have been initiated. In general, the common thermal fatigue issues are understood and controlled by plant instrumentation systems. However, incidents in some plants indicate that certain piping system Ts are susceptible to turbulent temperature mixing effects that cannot be adequately monitored by common thermocouple instrumentation. The THERFAT project has been initiated to advance the accuracy and reliability of thermal fatigue load determination and to outline a science-based but still practical methodology for managing thermal fatigue risks in T connections susceptible to high cyclic temperature fluctuations. The THERFAT work in the installed work packages (WP) focuses on the following technological aims:
- Screening of existing plant and R & D data (WP 1),
- Assessing the fatigue significance of turbulent thermal mixing effects in piping system T connections and identifying the fatigue-significant parameter (WP 2),
- Quantifying the existing safety margins against failure by applying standard methods and advanced fatigue and fracture mechanics analysis routes and determination of fatiguerelevant threshold values (WP 3),
- Verification of selected aspects of fatigue assessment by experimental damage tests with cyclic thermal shock loads (WP 4),
- Proposition of a road map as part of a European methodology on thermal fatigue, considering the results of current and past activities (WP 5).

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