Duke’s Robinson unit briefly loses off-site power

The Duke Energy (NYSE:DUK) H.B. Robinson Unit 2 nuclear facility in South Carolina went offline temporarily Oct. 8 and declared an “unusual event” due to the “momentary” loss of off-site power, according to an event report filed with the Nuclear Regulatory Commission (NRC).

An unusual event is the least serious of NRC’s multi-phase emergency classifications. It indicates the presences of events that could indicate potential degradation of the level of safety of the plant.

“At 1304 EDT Robinson Unit 2 experienced a momentary grid voltage drop that lowered the 4kV bus voltage and initiated an automatic reactor trip,” according to the report filed with NRC.

The NRC event report made no mention of whether Hurricane Matthew might have factored into the outage.

The situation was corrected and the unusual event designation was terminated after midnight on Oct. 9, according to the report.

As of early Oct. 11, Robinson 2 was listed at 48% power, according to NRC data. Robinson is a single-unit pressurized water reactor (PWR) in Darlington County, South Carolina that can generate roughly 725 MW. Robinson 1 is a retired coal unit at the same location.

About Wayne Barber 4201 Articles
Wayne Barber, Chief Analyst for the GenerationHub, has been covering power generation, energy and natural resources issues at national publications for more than 20 years. Prior to joining PennWell he was editor of Generation Markets Week at SNL Financial for nine years. He has also worked as a business journalist at both McGraw-Hill and Financial Times Energy. Wayne also worked as a newspaper reporter for several years. During his career has visited nuclear reactors and coal mines as well as coal and natural gas power plants. Wayne can be reached at wayneb@pennwell.com.