The iodine pit, also called the iodine hole or xenon pit, is a temporary disabling of a nuclear reactor due to buildup of short-lived nuclear poisons in the reactor core. As coupling coefficient becomes smaller, xenon oscillation becomes more unstable as expected. XENON DOE-HDBK-1019/2-93 Reactor Theory (Nuclear Parameters) Xenon-135 Response to Reactor Power Changes During periods of steady state operation, at a constant neutron flux level, the xenon-135 concentration builds up to its equilibrium value for that reactor power in about 40 to 50 hours. A major contribution to the sequence of events leading to the Chernobyl nuclear disaster was the failure to anticipate the effect of "xenon poisoning" on the rate of the nuclear fission reaction in the Chernobyl nuclear reactor.. Neutron absorption is the main activity which controls the rate of nuclear fission in a reactor - the 235 U absorbs thermal neutrons in … trol a pressurized water nuclear reactor (PWR) power based on the two-point kinetics equations with three groups of the delayed neutrons considering neutron absorber poison. And this is time. Spatial xenon oscillations are typical for power reactors, since they operate at higher neutron fluxes, in which the xenon burnup becomes a very strong component of the xenon 135 dynamics. Xenon spatial flux oscillations can be an operational problem in large reactors operating at high power levels. xenon oscillations, and the so called out-of- phase oscillations. Main purpose of the nuclear reactor is to initiate and control a sustained nuclear chain reaction.Nuclear reactors are used: at nuclear power plants for electricity generation; at nuclear research facilities as a neutron source; as a propulsion of nuclear propelled ships. During gross oscillations the reactor power changes in phase in every point of the core. Read "An approach to stability analysis of spatial xenon oscillations in WWER-1000 reactors, Annals of Nuclear Energy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Let me draw a graph, all right.

Xenon Poisoning. Xenon-135 Oscillations Large thermal reactors with little flux coupling between regions may experience spatial power oscillations because of the non-uniform presence of xenon-135. xenon oscillations, and the so c alled out-of- phase oscillations. In order to sustain a significant xenon oscillation, the average thermal flux of the reactor should be greater than 10 13 neutrons/cm -2 .s -1 (typical PWR has about 3×10 13 neutrons/cm -2 .s -1 ).

These oscillations must be maintained within acceptable limits; otherwise, the nuclear power plant could become unstable. JP3202430B2 JP22724993A JP22724993A JP3202430B2 JP 3202430 B2 JP3202430 B2 JP 3202430B2 JP 22724993 A JP22724993 A JP 22724993A JP 22724993 A JP22724993 A JP 22724993A JP 3202430 B2 JP3202430 B2 JP 3202430B2 Authority JP Japan Prior art keywords core output xenon reactor concentration Prior art date 1993-09-13 Legal status (The legal status is an assumption and is …

It has been suggested that the Small Modular Reactor (SMR) could play a significant role in the spread of civilian nuclear technology to nations previously without nuclear energy. Xenon-135 is a product of U-235 fission and has a very large neutron capture cross section (about 2.6 x 106 barns ). Control of Distributed Reactors in Load-Following.

Two-point coupled reactor equations are derived for the analysis of stability of xenon oscillation of coupled thermal reactor by the nodal method with use of Green's function. The methodology development takes into account both neutron transport and thermal hydraulics behaviors and their inter-dependent feedbacks in a nuclear power reactor as a function of fuel burn-up.