[en] This is the second Progress Report from the Department for Reactor Physics of Aktiebolaget Atomenergi, which is issued for the information of institutions and persons interested in the progress of the work. In this report the activities of the General Physics Section have been included, since this section nowadays belongs to the department. This is merely an informal progress report, and the results and data presented must be taken as preliminary. Final results will be submitted for publication either in the regular technical journals or as monographs in the series AE-reports