<Tr> <Td> April 1979 </Td> <Td> Containment steam vented to the atmosphere in order to stabilize the core . </Td> </Tr> <Tr> <Td> July 1980 </Td> <Td> Approximately 1,591 TBq (43,000 curies) of krypton were vented from the reactor building . </Td> </Tr> <Tr> <Td> July 1980 </Td> <Td> The first manned entry into the reactor building took place . </Td> </Tr> <Tr> <Td> Nov. 1980 </Td> <Td> An Advisory Panel for the Decontamination of TMI - 2, composed of citizens, scientists, and State and local officials, held its first meeting in Harrisburg, Pennsylvania . </Td> </Tr>

Who did the three mile island accident affect