Abstract
AbstractIn 2000 BNFL Nuclear Sciences and Technology Services and Cogema Logistics started a joint project known as the Fuel Integrity Project, with the aim of developing realistic methods by which the response of light water reactor fuel under impact accident conditions could be evaluated. To this end BNFL organised tests on both unirradiated and irradiated fuel pin samples and Cogema Logistics took responsibility for evaluating the test results. The bending test span corresponded roughly to the fuel pin inter-grid distance. The outcome of the test was a failure starting at about 35 mm net lateral deflection and a few per cent of total deformation. Calculations were carried out using the ANSYS code employing a shell and brick model. The hull lateral compaction test corresponds to a conservative compression by neighbouring pins at the upper end of the fuel pin. In this pin region there are no pellets inside. The cladding broke initially into two and later into four parts, all of which were rather similar....
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