Engineering

A burst of 1 x 10^9 neutrons from a pulsed accelerator is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. The system has a multiplication factor of 0.968. Approximately 80% of the incident neutrons are absorbed in uranium

Problem 6 from Chapter 4 of Introduction to Nuclear Engineering (3rd Ed.) A burst of 1 x 10^9 neutrons from a pulsed accelerator is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. The system has a multiplication factor of 0.968. Approximately 80% of the incident neutrons are absorbed …

A burst of 1 x 10^9 neutrons from a pulsed accelerator is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. The system has a multiplication factor of 0.968. Approximately 80% of the incident neutrons are absorbed in uranium Read More »

From a pulsed accelerator, a burst of 1 x 1010 neutrons is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. If the system has a multiplication factor of 0.97 and approximately 80% of the incident neutrons are absorbed in uranium, calculate: (a) The number of first-generation fissions that the neutrons produce in the assembly, and (b) The total fission energy in joules released in the assembly by the neutron burst?

EXPERT ANSWER

From a pulsed accelerator, a burst of 1 x 1010 neutrons is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. If the system has a multiplication factor of 0.97 and approximately 80% of the incident neutrons are absorbed in uranium, calculate: (a) The number of first-generation fissions that the neutrons produce in the assembly, and (b) The total fission energy in joules released in the assembly by the neutron burst?

EXPERT ANSWER

From a pulsed accelerator, a burst of 1 x 1010 neutrons is introduced into a subcritical assembly consisting of an array of natural uranium rods in water. If the system has a multiplication factor of 0.97 and approximately 80% of the incident neutrons are absorbed in uranium, calculate: (a) The number of first-generation fissions that the neutrons produce in the assembly, and (b) The total fission energy in joules released in the assembly by the neutron burst?

EXPERT ANSWER

Water flows by gravity from the reservoir 1 to the reservoir 2 through a constant 5 cm diameter piping system as shown in the figure below. The flow rate is 5 L/s. The fluid at points 1 and 2 is open to the atmosphere (P P2-Patm). The density of the water is 1000 kg/m3, the dynamic viscosity is -1.307×10-3 kg/m, the roughness of the internal surface of the pipe is 0.00026 entrance, K-05 Standard elbow, langed, Ky-03 D 5 cm 4m Gate valve fully open volume boundary 80 m Esit, K-1.06 Question 3 Calculate: the average velocity, Reynolds number, Total pressure drop (sum of Minor and Major) Question 4 Assume that the fluid velocities at points 1 and 2 are nearly zero (V V2-0) apply the principle of energy conservation (Bernoulli with losses) (points 1 and 2) to determine the elevation zi

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1) Water at 10°C flows from a large reservoir to a smaller one through a 5- cmdiameter cast iron piping system, as shown in Fig. 8-48. Determine the elevation z1 for a flow rate of 6 L/s. Sharp-edged entrance, KL 0. 5 Standard elbow, flanged, KL-0.3 D-5 cm G ate valve, fully open K-0.2 9m Control volume boundary 80m -Exit, KL = 1.06

EXPERT ANSWER Given: Diameter of pipe, D=5 cm=0.05 m Flowrate of water, Q=6 L/s=0.006 m3/s Total length of pipe, L=Horizontal length+Vertical length= 80m+9m=89 m Elevation at point 2, z2 =4 m Loss coefficient for sharp edged entrance, KL, entrance=0.5 Loss coefficient for standard flanged elbow, KL, elbow =0.3 Loss coefficient for gate valve (fully open), KL, valve =0.2 Loss …

1) Water at 10°C flows from a large reservoir to a smaller one through a 5- cmdiameter cast iron piping system, as shown in Fig. 8-48. Determine the elevation z1 for a flow rate of 6 L/s. Sharp-edged entrance, KL 0. 5 Standard elbow, flanged, KL-0.3 D-5 cm G ate valve, fully open K-0.2 9m Control volume boundary 80m -Exit, KL = 1.06 Read More »