Xenon-135  Response  to  Reactor  Power  Changes

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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. Figure 6 illustrates a typical xenon transient that occurs as a result of a change in reactor power level.   At time zero, reactor power   is raised from 50%   power to 100% power.   When the reactor  power  is  increased,  xenon  concentration  initially  decreases  because  the  burnup  is increased  at  the  new  higher  power  level.    Because  95%  of  the  xenon  production  is  from iodine-135 decay, which has a 6 to 7 hour half-life, the production of xenon remains constant for several hours.   After a few hours (roughly 4 to 6 hours depending on power levels) the rate of production of xenon from iodine and fission equals the rate of removal of xenon by burnup and decay.  At this point, the xenon concentration reaches a minimum.  The xenon concentration then increases to the new equilibrium level for the new power level in roughly 40 to 50 hours. It should be noted that the magnitude and the rate of change of xenon concentration during the initial 4 to 6 hours following the power change is dependent upon the initial power level and on the amount of change in power level.   The xenon concentration change is greater for a larger change in power level. Figure 6    Xenon-135 Variations During Power Changes NP-03 Rev. 0 Page 40


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