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An Assessment of the Feasibility of Indefinite Containment of Canadian Nuclear Fuel Wastes

Author: D. W. Shoesmith

Publisher: Pinawa, Man. : Whiteshell Laboratories

Published: 1995

Total Pages: 128

ISBN-13:

This report analyzes the expected corrosion behavior of nuclear fuel waste containers in a conceptual Canadian disposal vault. The container materials considered are dilute titanium alloys and oxygen-free copper. The report presents various models that have been developed to predict container lifetimes, including the currently used model which does not take into account limitation of crevice corrosion and an outline of a model in which crevice corrosion is limited by repassivation. The disposal vault conditions considered change with time as the initially trapped oxygen is consumed and as the heat and radiation produced by the waste decay. The appendices contain detailed reassessments of the corrosion behavior of the two types of containers, in which model assumptions are examined and failure modes discussed.

An assessment of the feasibility of indefinite containment of Canadian nuclear fuel wastes

Author: D. W. Shoesmith

Publisher:

Published: 1995

Total Pages: 0

ISBN-13:

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Initially, the snubber was installed between a high pressure centrifugal pump and its enclosure to see if fretting damage to the snubber screw could be induced with the pump operating. this was followed by limited cycling in a crank driven snubber tester at 30 hz and several different strokes. after each test, the snubber was disassembled for inspection. the results indicated the following: (i) the ball screw is capable of withstanding the load cycles it was subject to without visible damage. (ii) damage to the split outer race of the main thrust bearing resulted, we believe, from loosening of the locking ring during rig testing. (iii) the mechanism is rugged and appears to be capable of doing the job intended. calculations of velocities, kinetic energies of rotation, braking forces, etc., of the various snubber parts have been made. these results, when compared with the design specifications, were found to be of a magnitude consistent with them.