Lifetime analysis of wwer reactor pressure vessel internals concerning material degradation (original) (raw)
2010, Strength of Materials
The internal structures of water reactors play an important role as they contain the core of the reactor, they channel the water flow inside the vessel and they support and guide the instrumentation necessary for controlling and monitoring the reactor. Long-term aging at WWER operating temperatures results in changes in microstructure and phase composition, and, hence, mechanical properties of structural steels for WWERs. Besides Reactor internals are subject of three principle operation influences: neutron and gamma irradiation, static and dynamic mechanical stresses and coolant chemistry. Design basis for the reactor internals in WWERs did not calculated with any ageing of these structures due to that time unknown mechanisms of degradation. In this study we shall negotiate the effect of these mechanisms for WWER 440 RVI and present lifetime analysis in order to extend the operational lifetime of RVI.
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