For insufficient cooling of nuclear reactor core the following processes characterizing the core degradation are identified after years of research, see Potter et al. (1985).
800–900°C: The cylindrical cladding starts to become plastic. The pressure increase inside the cladding leads to ballooning and following failure, Rose et al. (1979), Chapman et al. (1984), Hindle and Mann (1982), Kerb et al. (1982), Rosinger (1984), Arai et al. (1987);
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Kolev, N.I. (2009). Core degradation. In: Multiphase Flow Dynamics 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-92918-5_13
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