[en] An analytical expression for evaluating reactivity changes in a reactor due to horizontal displacement of the regulating rod axis from its coaxial location in the reactor channel is derived. The perturbation theory in the one-group diffusion approximation is used. For the WWR-M research reactor the maximum relative reactivity change may amount to about 2%

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[en] Results of the calulations of the non-uniformity coefficient of heat flux along perimeter of cylindrical bodies (fuel elements) with cruciform cross section in the case of linear internal heat source distribution are presented. The values of this coefficients as function of Bi criterion and the values and orientations of the heat source gradient are obtained. 9 refs.; 5 figs

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[en] Distribution of γ radiation in the core, vessel, light-water trap and heavy-water reflector of the PIK-type reactor is calculated by the Monte Carlo method. Inside the core due to a hard γ quanta spectrum the value of specific energy release in materials with small and medium Z is determined generally by the Compton scattering process and it is proportional to Z/A. Uranoim essential comcemtration in fuel elements leads to the increase of the absorption part (by 10-15% in comparison with a homogeneous case). The part of soft quanta in reflector and trap water is hogher than in the core due to the value of photoabsorption cross section which is lower. Materials with medium and high Z placed in water will capture soft quanta mainly in near-surface layer as the growth of photoabsorption cross section leads to strong self-shielding. For such specimens the contribution of surface absorption of soft quanta can be noticeable. It should be taken into account when gauging γ radiation detectors as well as when constructing channels and other experimental devices in the reflector and trap. Energy release from γ quanta absorbtion in the wall of a steel reactor vessel on the level of a central plane of the core can be 0.20-0.25 W/gxMW causing in it considerable temperature stresses. 8 refs.; 10 figs.; 1 tab

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[en] On the basis of measurements of γ quanta circular polarization in light-water and graphite targets, installed in the centre of the WWR-M reactor core, a direct estimation of the restriction on fast neutron mean polarization is determined. Its value is small and it can be neglected in reactor computations. However, in experimental studys of small effects of P-parity non-conservation in weak interactions it should be borne in mind the possibility of appearance of γ quanta as a result of strong and electromagnetic interactions in the case of sharp asymmetry in the reactor properties