Poisoning

Some of the fission productsNuclides generated by fission or subsequent radioactive deca... generated during the operation of a reactorSystem used to initiate, maintain and control a fission chai... have a large capture cross-section for neutrons (e.g. Xe-135). The control device must be adjusted to compensate for the reactivityMeasure of the deviation of a reactor from critical (self-su... equivalent of the reactorSystem used to initiate, maintain and control a fission chai... poisons to keep the reactorSystem used to initiate, maintain and control a fission chai... at its power level. ReactorSystem used to initiate, maintain and control a fission chai... poisons (e.g. boron acid solution) are injected into water-moderated reactors for emergency shutdown. Boric acid solution is used to compensate for excess reactivityHigher reactivity value than required to achieve criticality... in pressurized water reactors.