[en] The methodologies used in safety analyses of nuclear waste disposal are reviewed. Particular reference is made to the KBS-3 proposals and to the WP-Cave concept. These methodologies are aimed mainly at reducing uncertainties in the predictions of health consequences from nuclear waste repositories, and quantifying the uncertainties that remain. The steps of a safety analysis are described in turn and the currently used techniques are discussed. Recommendations are made as to the use and development of the techniques and the need for new techniques. (author)