In addition, the methods which were used to define the conditions that existed in the containment building before, during, and after the hydrogen burn are described. The processes, rates, and quantities of hydrogen gas generated and removed during and following the LOCA are described in this report. Even though the burn increased the containment gas temperature and pressure to 1200/sup 0/F (650/sup 0/C) and more » 29 lb/in/sup 2/ (200 kPa) gage, there was no serious threat to the containment building. The hydrogen burn that occurred 9 h and 50 min after the initiation of the TMI-2 accident went essentially unnoticed for the first few days. During the TMI-2 loss-of-coolant accident (LOCA), a large quantity of hydrogen was generated by a zirconium-water reaction.

2 (TMI-2) nuclear power plant on March 28, 1979. This document summarizes what has been learned from generation of hydrogen in the reactor core and the hydrogen burn that occurred in the containment building of the Three Mile Island Unit No. Material and equipment in reactor containment buildings can be protected from burn damage by the use of relatively simple enclosures or insulation. The results of data evaluations and engineering calculations are presented to show the pressure and temperature histories of the atmosphere in various containment segments during and after the burn.

Even through the burn increased the containment gas temperature and pressure to 1200/sup 0/F (650/sup 0/C) and more » 29 lb/in/sup 2/ (200 kPa) gage, there was no serious threat to the containment building.

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