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Download From collective states to quarks in nuclei : proceedings of by H. Arenhövel, A. M. Saruis PDF

By H. Arenhövel, A. M. Saruis

Subsidized via Comitato Nazionale Energia Nucleare, study Dep. RIT

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Extra resources for From collective states to quarks in nuclei : proceedings of the Workshop on Nuclear Physics with Real and Virtual Photons held in Bologna, Italy, November 25-28, 1980

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3 Application of Perturbation Theory: Reactivity Worth of Partially Inserted Control Rod [26] An application of the one-group first-order perturbation theory is discussed here. A bare cylindrical reactor of extrapolated radius R and height H is considered, in which a central control rod of radius a is partially inserted, as shown in Fig. 15. The insertion depth of the control rod from the origin in the top of the cylindrical reactor is denoted by x. If the control rod is a relatively weak absorber of neutrons and the control rod insertion has a small effect on the change in neutron flux distribution, then the first-order perturbation theory can be applied to obtain the reactivity worth of the partially inserted control rod.

72) can be summed with the fuel temperature coefficient of the disadvantage factor in Eq. 65), that is, ð1:73Þ It turns out that αζT is always negative [14]. This is due to the fact that the thermal diffusion length increases with temperature. As the diffusion length increases, the neutron flux in the lattice fuel cell tends to flatten, that is, the depression of the flux across the cell becomes less pronounced, and this leads to a smaller value of the disadvantage factor. As a result, there is a positive reactivity effect on the temperature coefficient of the thermal utilization factor.

The 149Sm poisoning is small compared with 135Xe poisoning and does not have a large effect on the reactor 18 S. Ohki dead time. 21 days so that the 149Sm buildup proceeds comparatively slowly. When a reactor is restarted after shutdown, the burnout of the accumulated 149 Sm gives a positive reactivity to the system toward the equilibrium value at operation. This effect occurs regardless of how long after shutdown the re-startup occurs. 3 135 Xe Transients with Power Level Changes The 135Xe buildup occurs when a reactor is brought to a low power level as well as at shutdown and then the 135Xe concentration begins to decrease soon, or vice versa, when the power level is increased.

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