[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] The panel was attended by prominent physicists from most of the laboratories engaged in the field of heavy water lattices throughout the world. The participants presented written contributions and status reports describing the past history and plans for further development of heavy-water reactors. Valuable discussions took place, during which recommendations for future work were formulated. Refs, figs, tabs

[en] A simplified method to evaluate the neutron balance for organic-cooled, heavy-water-moderated lattices was established at the Reactor Physics Department of EURATOM-C.C.R., Ispra (Italy). The method used to calculate the cold unirradiated lattice parameters (Caroline I code for IBM 7090) is based on the French correlation for heavy-water-cooled and moderated lattices; the replacement of heavy water by organic as coolant is properly taken into account. A test of this calculation method, based on the results of recent Canadian and EURATOM critical experiments on natural-uranium, organic, heavy water lattices proved to be satisfactory. 18 refs, 11 figs

[en] The spatial variations of neutron spectra and of selected effective cross-sections have been calculated using the THERMOS code. Results are given for lattices of natural-uranium metal and oxide tubes cooled by D₂O over a temperature range from 20 deg. C to 215 deg. C. (author). 3 refs, 5 figs, 2 tabs

[en] A code is described that is used at the Savannah River Laboratory to calculate the buckling and other lattice parameters of D₂O-moderated lattices. A comparison is made of calculated and measured bucklings for a variety of lattices. Two adjustments are made in the calculations to improve the agreement. The amount of resonance absorption is reduced by about five per cent for lattices containing uranium metals and the value of η is assumed to be a linear function of the ratio of moderator volume to fuel volume and both of the coefficients in this expression are adjusted. The agreement between measured and calculated bucklings is within ± 0.25 m^-2 for almost all of the lattices of single rods or of tubes and is within ± 0.50 m^-2 for almost all of the lattices of rod clusters. (author). 20 refs, 6 figs, 4 tabs