CBRN event in United States of America on Sun 2nd November 2025

2nd November 2025

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On November 2, 2025, at 0915 EST, and on November 3, 2025 at 0203 EST, while [Hatch] Unit 1 was at 100-percent power, the normal supply breaker from the `1D' 600V switchgear to the 120/208V essential transformer `1C' tripped on overcurrent due to a ground resulting in the loss of the `1B' essential bus and the `1B' instrument bus. The loss of power impacted the logic of the primary and secondary containment isolation systems resulting in the invalid actuation of containment isolation valves (CIVs) in multiple systems. The ground within the `1D' 600V switchgear was cleared by racking [out] the associated breaker and by replacing a degraded wire. A future action includes performing a detailed cubical and bus bar inspection of the `1D' 600V switchgear.

Contextual analysis

Analysing the event count by highlighting the presence of munition categories over a six-month data period.

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United States of America (USA)

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