Write two-group criticality condition for a bare homogeneous reactor. Using this equation, show that the six factor criticality condition for two group theory is given by nf p pf pt =1.symbols have their usual meanings.
The scattering cross-section of Carbon at 1 eV is 4.8 barn. Estimate the diffusion coefficient of Carbon. Assume that a is almost negligible.
See Answer →For an arbitrary volume V of material in which one speed neutrons interacts with medium nuclei, if n(r,t) is the neutron density at r and at time t , obtain the equation of continuity. Also, obtain equation for steady state.
See Answer →Discuss the initial, boundary and source conditions
See Answer →Using spherical harmonics method for a non- multiplying 1-D plane geometry, write the exact infinite coupled equations. Hence for a large non-absorbing system, obtain equations under P1 approximation. Discuss the limitations of PN approximation
See Answer →Write the basic assumptions made to derive the transport equation. Hence, derive the Boltzmann transport equation for a multiplying system in terms of neutron flux.
See Answer →Define angular neutron flux and angular current density. The neutron flux at a particular location in a reactor core is 1x1014 neutrons cm- 2s-1What is the average density (in neutrons cm-3 ) 3 in of the thermal neutrons at the same location in the core?
See Answer →If a 10 MeV neutron is collided with 238 U nuclide, compare the average energy loss of neuron if they undergo a) inelastic scattering and b) elastic scattering.
See Answer →Derive an expression of average logarithmic energy decrement per collision (). Hence, show that for large mass number, it is independent of energy. Using this formula, plot average logarithmic energy decrement for different nuclides of mass number A.
See Answer →A 2.6 MeV neutron collides with hydrogen. Calculate the probability that the energy of neutron is within the energy range 0.63 and 0.75 MeV after collision? If a neutron loses 0.75 MeV in LAB system, what is the scattering angle in the CM system?
See Answer →Define LAB and CM coordinate frames of reference used to study the kinematics of two- body collision. Obtain an expression of kinetic energy of a neutron after collision in the LAB system.
See Answer →Discuss the concept of breeding and doubling time and describe how abundant fertile actinides could be converted to excellent fissile actinides.
See Answer →i) What is the difference between slowing down density and flux of neutrons?
ii) If the reference neutron energy is 10 MeV, calculate the lethargy at 200 keV, and 0.025 eV?
See Answer →The average number of neutrons produced per fission is 2.5. What would happen in a second, if every neutron released in fission causes another fission? Assume a generation time of 0.1 second.
See Answer →Distinguish between prompt and delayed neutrons released in fission and discuss their importance.
See Answer →Calculate the macroscopic scattering cross section for natural uranium. Given 3 18.9 g/cm , percentage weight of 235U in natural uranium is 0.713; the rest being 238U . The scattering cross sections for 235U and 238U isotopes being 15 b and 13.8 b, respectively.
See Answer →पर्यटन में संयुक्त प्रचार-प्रसार करना क्यों आवश्यक है?
See Answer →बहुविषयक दृष्टिकोण क्या है?
See Answer →ज्ञानानुशासन कैसे विकसित होता है?
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