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Integrity control of an RBMK-1500 fuel rod locally oxidized under a bounding reactivity-initiated accident

Nuclear Science and Techniques 2019年第1期30卷 133-143页

作者： Hamid Boucherit Algirdas Kaliatka Azzedine Lounis Division of Fuel Technology Nuclear Research Center of Draria Lithuanian Energy Institute Science and Materials Engineering Laboratory University of Sciences and Technology Houari Boumediene

In 2007, the license for the second reactor unit of the Ignalina nuclear power plant was renewed considering the safety-related modifications introduced in this *** Safety Analysis Report for this reactor unit was prepared with more strict criteria. The bounding reactivityinitiated accident(RIA) performed by the Lithuanian Energy Institute could be mentioned as an example. The performed analysis demonstrated that even when the worst initial conditions and possible uncertainties are considered,the fuel cladding remains intact. However, the analysis was performed assuming a fresh fuel assembly. In this study, an analysis of the fuel rod cladding behavior in the RBMK-1500 reactor following a bounding RIA is performed using the computational codes FEMAXI-6 and RELAP5. The analysis is extended by modeling an oxide layer(nodular corrosion) on the external surface cladding. An uncertainty and sensitivity analysis was performed using a method developed by the Society for Plant and Reactor Safety,employing the Software for Uncertainty and Sensitivity Analyses, in order to evaluate the effect of the oxide layer on the inside and outside fuel rod temperatures. The results of the thermo-mechanical analysis(stress, strain, and enthalpy) for a local oxide layer with a thickness of 70μm show that despite the exceeded limit of allowed linear power density, the fuel rod is under acceptable safety conditions.

关键词： Safety reactivity-initiated accident Corrosion RBMK-1500 FEMAXI-6 RELAP5 Software for Uncertainty and Sensitivity Analyses (SUSA)

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