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Calculating E_fiss

The majority of thermal nuclear power reactors use slightly enriched $\mbox{UO}_2$ fuel. In these fuels fission may occur not only in ²³⁵U but also in ²³⁸U by fast neutrons. This necessitates a discussion of the choice of E_fiss in (1.102). According to [11, p. 159], fission of ²³⁸U may account for as much as 20 percent of the total number of fissions and since the energy release for fission of ²³⁸U is about 3 percent higher compared to fission in ²³⁵U (see Table 1.1, p. ) we are able to make the following worst case calculation

$$\begin{eqnarray*} E_{fiss,exact} &=& 0.8 E_{fiss,\mbox{${}^{235}$U}} + 0.2 E_{f... ...mbox{${}^{235}$U}}) \approx 1.006 E_{fiss,\mbox{${}^{235}$U}} \end{eqnarray*}$$

$\parbox{1.50cm}{\begin{eqnarray} \end{eqnarray}}$

Accordingly, if we assume E_fiss to be that of ²³⁵U a negligible error in the order of only a half percent is introduced. In all practical calculations that follow we make this approximation.

 
 

 
 

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