The concept of Leak-Before-Break (LBB) is being applied to design the 500 MWe Indian Pressurized Heavy Water Reactor (PHWR) primary heat transport (PHT) piping system. Towards this goal, a detailed non-linear fracture analysis has been carried out on all the straight pipes and elbows of the 500 MWe PHWR PHT system. In this analysis, leakage size cracks which leads to the leakage of 0.5 kg/s are determined for various pipe lines. Material properties of the actual PHT system are evaluated at service temperatures. Both limit load and J-integral-Tearing modulus analyses have been carried out on different piping components. Finally, critical bending moments are evaluated for various pipe lines. Critical bending moment is defined as the minimum of the limit moment and the unstable ductile tearing moment. Subsequently, factors of safety (FOS) are determined with respect to the emergency bending moment that may act on the pipes during an earthquake. The FOS thus determined are always less than the minimum required values and hence the 500 MWe PHWR PHT piping is qualified for LBB behaviour.


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    Title :

    Fracture analysis of 500 MWe Indian PHWR PHT piping with throughwall cracks


    Contributors:


    Publication date :

    1998


    Size :

    9 Seiten, 20 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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