Abstract
The problem of finding an effective temperature is highly important. This characteristic provides calculation of the power effect reactivity (PER), which defines safe and stable operation of nuclear reactor. The numerical experiment, which is considered on average and maximum heat load conditions, is put to find out changing of the effective temperature in the high burnup fuel of WWER-1000. In the course of the experiment mathematical statement of the problem is made, numerical solution of which is found with using the finite differences approximation of both control equations and border conditions. Also, the method of simple iteration is used for calculating temperature distributions, according to determination of the effective temperature. The linear approximation was obtained basing on effective and maximum temperatures depending on the burnup.
Highlights
One of the most important characteristics of a nuclear reactor is the power effect of reactivity (PER), which is defined with the effective temperature and actual amount of 235U in fuel
The effective temperature is an average temperature of a fuel pellet; it can be determined with the exact integral formula [1]:
Temperature distributions were found in interval of burnups from 40MWd / kgU to 100MWd / kgU
Summary
The effective temperature is an average temperature of a fuel pellet; it can be determined with the exact integral formula [1]: Rdr rT 2 rdr TT r temperature distributions over the fuel pellet; Tmax maximum temperatures on the axis of the fuel block; Tc temperatures on the surface of the fuel block. The rim-effect is a process of forming a thin layer around a periphery of the fuel pellet, it has high porosity and has increased heat release. The rim-layer is always associated with the high burnup fuel ( B 40MWd / kgU ).
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