Exam 1 solution - MEAE 4720 -Design and Analysis of Energy...

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Unformatted text preview: MEAE 4720 -Design and Analysis of Energy Systems, Exam 1 3/3/2007 1 NAME:_____________________________ Problem 1. (10 points) Consider fuel rods having parameters as the B&W PWR in Table 1), are positioned as shown in fig 1. The length of the rods is 3.6 m. a) Assuming the fuel rod bundle is cooled by water flowing at 2 m/s (p and T are given in the Table 1), determine the maximum safe heat flux q” a [KW/m 2 ] at the surface of the rod. b) Now assume that the pump has failed and that water velocity is reduced to 0.005 m/s. The control system shuts down the reactor, but a relatively small fraction of power/energy is still being released, giving a surface flux of q” b =100 [kW/m 2 ] b.1) Calculate the temperature difference between the Zicaloy clad and the water. b.2) Any comments ? Table 1 B&W PWR Reactor Data Thermal output MWt 3600 Electrical output MWe 1200 Fuel type UO 2 Coolant H 2 O Moderator H 2 O Structural material Zicaloy Core active height, m 3.63 Core effective diameter, m 352 Total # fuel rods 54120 Fuel rod type Clad rod Fuel rod OD 0.94e-2 Fuel pellet diameter, m 0.823e-2 Gap, m 0.01e-2 Clad thickness, m 0.0597e-2 Pressur, bar 155 Inlet T, C 300 Outlet T, C 333 Maximum fuel temperature, C 2021 s=1.25 d MEAE 4720 -Design and Analysis of Energy Systems, Exam 1 3/3/2007 2 "Problem 1. (10 points) Consider fuel rods having parameters as the B&W PWR in Table 1), are positioned as shown in...
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This note was uploaded on 04/28/2008 for the course MANE 4400 taught by Professor Ostrogorsky during the Spring '07 term at Rensselaer Polytechnic Institute.

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Exam 1 solution - MEAE 4720 -Design and Analysis of Energy...

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