QUANTIFIED RISK ASSESSMENT - A NUCLEAR INDUSTRY VIEWPOINT

This paper presents a brief summary of the methodology used for the as sessment of risk arising from fuel handling and dismantling operations in advanced gas-cooled reactor power stations. The difficulties with and problems arising from such risk assessments are discussed. In part icular, difficulties arise from (i) the onerous risk criteria that nuc lear plants are expected to satisfy, (ii) the necessary complexity of the plant, (iii) the conflicting requirements for the fault consequenc e assessments to be bounding but not grossly pessimistic, and (iv) are as of fault frequency assessment which contain possibly subjective con siderations such as software and common mode failure.