Effective Multiplication Factor (keff). . keff determines whether the neutron density within a reactor will remain constant or change.. keff and Power. Power is directly proportional to neutron density keff = 1.0000 ? critical (power constant)keff < 1.0000 ? subcritical (power decreasing)keff > 1.0000 ? supercritical (power increasing). - PowerPoint PPT Presentation
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