Thermal regimes of high burn-up nuclear fuel rod
  The temperature distribution in the nuclear fuel rods for high burn-up is studied. We use the numerical and analytical approaches. It is shown that the time taken to have the stationary thermal regime of nuclear fuel rod is less than one minute. We can make the inference that the behavior of the nuclear fuel rod can be considered as a stationary task. Exact solutions of the temperature distribution in the fuel rods in the stationary case are found. Thermal regimes of high burn-up the nuclear fuel rods are analyzed. 
Nikolai A. Kudryashov and Aleksandr V. Khlunov and Mikhail A. Chmykhov
physics.chem-ph cond-mat.stat-mech