Problem 8.10 Maximum linear power from a duplex fuel pellet (Section 8.5) To uprate the power of its LWR fleet, an elect

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Problem 8 10 Maximum Linear Power From A Duplex Fuel Pellet Section 8 5 To Uprate The Power Of Its Lwr Fleet An Elect 1 (261.52 KiB) Viewed 69 times

Problem 8.10 Maximum linear power from a duplex fuel pellet (Section 8.5) To uprate the power of its LWR fleet, an electric utility is considering the use of duplex fuel pellets. A duplex fuel pellet consists of two radial zones, one loaded with UO2 and one with PuOz (Figure 8.32). The pellet outer temperature is fixed at 400°C. 1. Assuming that centerline fuel melting is the design limit for this pellet, which oxide would you put in Zone 1 (i.e., the inner zone)? 2. Using only the properties in Table 8.11 and assuming that the volumetric heat generation rate in PuO2 is 50% higher than in U02, calculate the maximum linear power at which the pellet can be operated without melting the fuel. (Neglect the thermal conductivity dependence on temperature.) TABLE 8.11 Properties of Oxide Fuels UO2 PuO2 10.5 10.9 Parameter Density (g/cm3) Thermal conductivity (W/m °C) Melting point (°C) Specific heat (J/kg °C) 3.0 2.5 2800 2300 410 380
Zone 2 Zone 1 R; = 4 mm Rfo = 5 mm R Rio FIGURE 8.32 Cross-sectional view of a duplex fuel pellet.