# hw_6 - J Buongiorno Spring 2005 22.313J 2.59J 10.536J...

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J. Buongiorno / Spring 2005 22.313J, 2.59J, 10.536J THERMAL-HYDRAULICS IN POWER TECHNOLOGY Homework Set 6 1. Calculation of the MDNBR in the PWR Hot Channel Consider the PWR hot channel geometry and operating conditions from Homework Set 5. i) Find the distribution of the DNBR in the channel. ( Hint: use the Tong-68 correlation, and ignore grid spacer effects) ii) What is the location of the MDNBR? iii) If the inlet temperature is decreased, while all other operating conditions are kept constant, how does the DNBR distribution in the channel change? Provide a qualitative sketch of the new distribution. 2. Thermal Analysis of the BWR Fuel Assembly A typical 8 × 8 BWR Fuel Assembly (FA) is shown in Figure 1. Only 62 (out of 64) positions are occupied by fuel pins, the other two positions are occupied by so-called “water rods”, which generate no heat. The heated length of the fuel pins is 3.81 m. The FA operating conditions are as follows: Pressure: 6.4 MPa Inlet temperature: 270 ° C (corresponding to an inlet enthalpy of 1183.8 kJ/kg)

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