Within the framework of the revision of the nuclear rules and regulations (summary report of the 368th RSK Meeting on 11.12.2003), the RSK discussed in detail the topic area "object and purpose of postulates" and also addressed, in particular, postulated leaks and breaks. It dealt with conditions and use case of the postulates in connection, among other things, with safety analyses for the release of pipe insulation material. The statements elaborated during the meeting will be laid down in a paper.