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Some important reactor materials such as deuterium and beryllium have non-negligible (7, ή)'cross-section In the energy range of'fission product's 7 radiation. Although the influence of this effect is negligibly small for a stationary state of a rector core, the delayed photons from short-living fission products can result in kinetic effects analogous to that of the delayed neutrons. The Budapest Research Reactor has a beryllium reflector and the control rod worth measurements are based on the doubling time method. In this paper the calculation of the parameters necessary for the evaluation of the measurements takes the photoneutrons into account is described. For this purpose a number of Monte Carlo calculations were performed with various photon energy spectra because the spectrum of the delayed photons depends strongly on the time elapsed after the fission event. It is shown that the neglection of the photoneutrons leads to an underestimation of the control rod worth.

Influence of the Photoneutrons on the Kinetics of Beryllium Reflected Core of the Budapest Research Reactor