[en] It was stated in Supplement No. 2 to the Safety Evaluation Report that except for the hydrogen control measures for the Sequoyah units, all matters had been resolved to the extent that the activities authorized by the license can be conducted without endangering the health and safety of the public. The staff is presently reviewing a recent report from TVA entitled 'Report on the Safety Evaluation of the Interim Distributed Ignition System' (Volume 1 and 2) dated September 2, 1980. This supplement provides further information and reviews on the hydrogen issue. Pending further action which may be required as a result of rulemaking, but no later than January 31, 1981, TVA shall by testing and analysis show to the NRC's satisfaction that the interim distributed ignition system will function in a manner that will mitigate the risk which could stem from the generation of hydrogen