[en] In order to pick up the important items for the safety researches scenarios and data bases were listed. The structure of this report is as following: 1) Based scenario. The most probable release scenario and well known mechanism were selected to assess the system performance at normal conditions. 2) Other scenarios. Unknown phanomena likely relevant to release were collected for sensitivity analysis of the phenomena and less probable penomena were collected for assessment on abnormal conditions. 3) Data bases - For preconditions : The combination of barriers, phernomenas to be assessed, data regarding the waste form, capacity of repository and dominant functions of bariers for each period were reviewed. - For based scenario : Recommended values of parameters in the based scinario were selected from mainly national assessment reports such as Project Gewahr '85 and KBS-3. Results of relating experiments in our laboratory were also described briefly. - For other scenarios : Probable values and/or the range of parameters were reviewed. 4) Probabilistic phenomena relevant to release. A categories of IAEA safety series No. 68 were referred where they are categorized to two groups bringing perturbations of normal scenarios and new scenarios. (author)