Correlation method for measuring the zero-power reactor absolute power

A correlation method is suggested for measuring the absolute power of intermediate and fast neutron reactors before the stage, when the value can be measured by thermal methods. In the framework of the Cohn model a ratio between the absolute reactor power and intercorrelational characteristic of ionization neutron detector currents, recording the neutron flux from a reactor, is obtained. The dependence of statistical error of the method on the detector efficiency and measurement duration is considered. The conclusion is drawn that it is not expedient to use filters with a band wider than 10-20 Hz in fast neutron reactors due to narrow-band character of neutron detectors and the presence of intensive interferences of higher frequency