Sample Calculation with One-velocity Model

6 Sample Reactor Calculation with One-velocity Model 

As an example of the application of the one-velocity model to the analysis of nuclear reactors, we will determine the critical fuel mass and maximum flux level in a light-water-moderated reactor which is designed to produce 20 megawatts of heat. Let the core of this reactor be a 60- by 32.3- by 55.4-cm parallelepiped, and for the present analysis assume 

In this calculation we confine our attention to a study of the nuclear features of the proposed system. 

The only engineering specifications that we require are the total power output of the system, its geometric configuration, and the operating temperature. The core configura- 

The fuel element configuration shown in Fig. 5.28 is clearly a heterogeneous arrangement however, because of the relatively small scale of this heterogeneity, it is a reasonable approximation to assume, at least as a first estimate, that the core consists of a homogeneo s mixture of water, aluminum, and U . We will use this approximation in the calculations 

---