Abstract
AbstractThe development and refining of impact limited systems is described for BNFL's ‘Excellox’ irradiated fuel flasks. The process began with the adaptation of the aluminium cage type lid shock absorber developed for the original Excellox 1 flask to the longer and heavier Excellox 2 and 3 designs and finally to the 100 ton Excellox 4 flask. The importance of protecting the components and contents of the flask against high g base impacts is now realised. The development of compact balsa-filled lid and base shock absorbers which would cushion the flask and its contents against the IAEA 9 m impact test is described, and their refinement to protect flask orifices and seals against penetrative impact and fire. This development process entailed extensive testing of quarter-scale models at the CEGB Structural Test Centre and the tests, described in this paper, have provided a wealth of practical data which is already proving very useful in designing further flasks.
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