The gaps in the columns between the graphite block and the channel tubes change at the final stage of operation as a result of the radiation-thermal shape change and cracking of the graphite blocks. The gaps between the neighboring columns also change and deflections appear. As a result of the radiation creep, the diameter of the channel tubes increases and corrosion decreases the thickness of the tubes. These effects change the heat transfer and temperature of the graphite masonry and increase the stresses and deformation of the channel tubes and increase the likelihood of their being damaged. The results of a computational analysis of the serviceability of the tubes in RBMK process channels, taking account of the aging of the core, are presented. The deformation of the tubes under normal operating conditions and during emergencies is examined. The results of a calculation of the tubes according to the norms of strength and rupture probability for the purpose of describing the criteria of operational acceptability are described.
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Translated from Atomnaya Énergiya, Vol. 109, No. 5, pp. 275–278, November, 2010.
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Tkachev, V.V., Mikhailov, D.A., Zheltukhin, K.K. et al. Effect of aging of an RBMK reactor core on pipe strength in process channels. At Energy 109, 337–342 (2011). https://doi.org/10.1007/s10512-011-9365-9
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DOI: https://doi.org/10.1007/s10512-011-9365-9