J. G. Tyror's An Introduction to the Neutron Kinetics of Nuclear Power PDF

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By J. G. Tyror

ISBN-10: 0080066674

ISBN-13: 9780080066677

An advent to the Neutron Kinetics of Nuclear strength Reactors introduces the reader to the neutron kinetics of nuclear energy reactors. themes coated comprise the neutron physics of reactor kinetics, suggestions results, water-moderated reactors, quickly reactors, and strategies of plant keep watch over. The reactor transients following faults also are mentioned, in addition to using desktops within the examine of strength reactor kinetics.
This ebook is constructed from 8 chapters and starts with an summary of the reactor physics features of a nuclear energy reactor and their impact on approach layout and operation. using a mathematical version of the procedure to check reactor kinetics and keep an eye on is defined. the next chapters discover the neutronic facets of reactor kinetics; the interplay among neutronic occasions and the habit of different actual amounts of the reactor; the impression of suggestions results on neutron kinetics; and the neutron kinetics of water-moderated reactors and quickly reactors. the various keep watch over schemes for nuclear strength reactors also are thought of. the ultimate bankruptcy seems on the use of desktops to unravel the equations of kinetic versions for nuclear strength reactors.
This monograph might be an invaluable source for nuclear scientists, physicists, and engineers.

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Extra resources for An Introduction to the Neutron Kinetics of Nuclear Power Reactors. Nuclear Engineering Division

Example text

In other words, the effect of xenon poisoning is destabilizing. We shall return to this point later. But also if the reduced power is maintained then the 135Xe concentration continues to rise until the falling away of the 135I concentration causes the right-hand side of the equation for dxjdt to become negative. The 135Xe concentration then fails away to the equilibrium value appropriate to the new flux level. The time taken for the 135Xe concentration to reach its maximum following a drop in power is about 10 hr.

Non-uniform Reactor So far in this chapter we have been concerned with describing the kinetics of a reactor for the case of a uniform, step increase in multiplication in a spatially uniform reactor. In these idealized circumstances we have seen that the eventual time constant of the reactor (or reactor period) is related to the excess multiplication by the inhour equation—eqn. 20). In practice a reactor is often non-uniform in composition (if only through the presence of a reflector) and whilst changes in multiplication can be made sufficiently rapidly to justify the use of the step change these changes are themselves frequently nonuniformly distributed over the reactor.

In the first place the averages are not necessarily obvious, straightforward mean values. Thus, for example, we see from eqn. 35) that it is the inverse of the prompt neutron lifetime which is obtained by averaging—not the direct quantity /. Further, we note that the weighting functions occurring in the averaging processes include the neutron density φ0 or precursor density oi (as might be expec­ ted) but also the mysterious function χ*. This function χ* is, in fact, the neutron "importance" and is a measure of the importance of a neutron at r in sustaining the critical chain reaction.

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An Introduction to the Neutron Kinetics of Nuclear Power Reactors. Nuclear Engineering Division by J. G. Tyror


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