Atomic Energy of Canada Limited

About: Atomic Energy of Canada Limited is a company organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Zirconium alloy & Neutron. The organization has 4845 authors who have published 4826 publications receiving 102951 citations.

Postirradiation behavior of UO2 fuel I: elements at 220 to 250°C in air

Abstract: Irradiated UO2 fuel elements with and without deliberately induced 0.8-mm-diam defects were heated in air at 220, 230, and 250°C for times up to 685 h. Pretest burnup was typically 190 MW·h/kg U (7600 MW·d/TeU) at a maximum linear power of 45 kW/m; cooling times were 1 to 3 yr. In fuel elements with six defects, diametral increases in excess of 5% and sheath splitting occurred after ∼200 h at 250°C, consistent with oxidation to U3O8. There was a maximum 2% increase in elements with one defect at 250°C, but no change in an irradiated but undefected control. Dimensional increases in defected elements at 220 and 230°C were typically <1% for times in excess of 600 h, consistent with oxidation primarily to nonswelling U3O7.The rate of weight change at 230 and 250°C was up to 50 times greater in defected irradiated elements, compared with that for defected unirradiated elements. There was no significant effect of power history or cooling time in the elements studied.

Dark repair inhibitors and pathways for repair of radiation damage in Schizosaccharomyces pombe

Abstract: Different compounds known to inhibit dark repair in bacterial and mammalian systems have been tested for a similar effect in the yeast Schizosaccharomyces pombe. A marked inhibition of growth by these different drugs indicated that these were taken up by the cell, yet none except caffeine reduced the colony forming ability when present in the post-irradiation plating medium. The response of 22 different radiation sensitive mutants to the presence of caffeine in the plating medium was tested to investigate the probable number of pathways for repair of radiation damage in this organism. In some of the genetic crosses among single gene mutants showing a differential caffeine-response, supersensitive double mutants were obtained. Strains obtained either by additional crosses or by further mutagenic treatment of the supersensitive double mutants did not show a highly significant increase in radiation sensitivity. These observations indicate that the presently available radiation sensitive mutants represent defects in only two major pathways for repair of radiation damage in the wild type S. pombe.