EBR-I Melt-Down (1954)

This melt-down occurred when doing reactivity addition runs for period tests at low flow. The order to scram was misunderstood and a slow shut­down initiated rather than the fast scram. The whole core melted down in a few seconds. The accident was of course not directly due to the above instability considerations (43).

The detailed sequence of events for this accident was given in Section 4.4.4.1.