Last week, there were incidents involving loss of containment at the Oyster Creek and Limerick nuclear power plants due to doors being left open. Today, the Nuclear Regulatory Commission’s Event Reports page contains two more loss of containment incidents.
The Mllstone facility in Connecticut reported that on Wednesday a containment door was found unlatched in its Unit 3 reactor. The latch was found to be defective and will be repaired.
Additionally, the Susquehanna nuclear power plant in Pennsylvania reported that the secondary containment system in both Unit 1 and 2 had failed during surveillance testing on Wednesday. When there is a near-miss, the nuclear industry usually minimizes the safety significance of near-misses by pointing out redundant safety systems. In this case, Susquehanna reported: “There is no redundant Susquehanna Secondary Containment System.”