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Ex-Vessel Defueling for Three Mile Island Unit 2

Robert J. Wolfgang, Rayford L. Patterson

Nuclear Technology / Volume 87 / Number 3 / November 1989 / Pages 616-623

Technical Paper / TMI-2: Remote Technology and Engineering / Nuclear Safety / dx.doi.org/10.13182/NT89-A27713

The 1979 Three Mile Island Unit 2 accident caused fuel particles (fines) and debris to be transported throughout the reactor coolant system (RCS). Estimates of the fuel quantities in the RCS outside the reactor vessel boundary (defined as ex-vessel areas) have been developed. These estimates, in conjunction with as-low-as-reasonably-achievable considerations, were used to determine which ex-vessel areas required defueling.