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Our expertise in nuclear reactor accident sequences and planning has covered 2 main areas: In the first we have been involved, as part of a team, in identifying a reference accident for nuclear powered warships that will form the basis of contingency planning to be used in the event of an accident when the vessel is berthed alongside. This work involved the production of a range of scenarios that might lead to an accident and then determining the frequency that each might be expected to occur. From this the dominant sequence can be determined. We were then involved in determining what might be an expected core inventory for each class of vessel likely to visit and the expected fraction of that inventory that could be expected to be released to the environment should an accident occur. This then allowed us to determine the reference accident. From this we proposed to the client (an agency of a national government) a range of planning measures that needed to be put in place, ranging from evacuation of a proportion of the population to the issues to be considered in the aftermath of the accident including clean-up procedures and techniques. The second area we have covered in this topic has been to analyse the fault sequences that lead to a number of different categories of nuclear reactor accident. For each step of the sequence we determined what needed to happen for the sequence to proceed to the next step. From this we were able to ensure that there were sufficient safeguard measures in place (preferably engineered, but failing that then procedural) to stop the incident proceeding. We also investigated the accident planning measures that we in place to ensure that these were appropriate and sufficient. |
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